SI-WSS Back Connect Bimetal Thermometer

3″, 4″, and 5″ Back Connect Large Industrial Bimetal Thermometers:

A rugged 90° back angle, rear threaded connection design.

Sino-Instrument’s Bimetal Thermometers are reliable and accurate temperature sensors,

requiring no electricity or wiring. 

Back Connect Thermometers are ideal for local,

eye-level temperature readings in most process applications.

They can be recalibrated with a turn of the calibration screw on the back of the dial.

A variety of options are available for your specific process needs.

Commonly used in industrial, pulp and paper,

food and beverage processing, HVAC, and OEM applications.

Features of SI-WSS Back Connect Bimetal Thermometer

SI-WSS Back Connect Bimetal Thermometer
SI-WSS Back Connect Bimetal Thermometer

Back connection with external reset

Made to ASME B40.3 Specifications

Accuracy ± 1% Full Scale (ASME B40.3 Grade A)

All Stainless Steel Construction

Hermetically Sealed (ASME B40.3)

Silicone Fillable for Vibration

Standard and Custom Stem Lengths

Standard External Reset for Calibration

OEM Logo Dials/Custom Dials

Specifications of SI-WSS Back Connect Bimetal Thermometer

  • Accuracy: ± 1.5% Full Scale (ASME B40.3 Grade A)
  • Dial Size:  63 up to 150 mm
  • Dial Material:
    • Anodized aluminum with black marks on satin matte finish background;
    • White or Hi-Vis™ background available.
  • Stem Length:  2.5 – 24″, other lengths available
  • Stem Diameter: 1/4” (std)
  • Head, Bezel, Mounting Bushing, Stems: 300 Series SS, 316SS (optional)
  • Operating Conditions: 
    • The head temperature should not exceed 200°F (150°F if silicone filled).
    • The stem should not be exposed to continuous temperatures exceeding 50% over-range or 800°F(550°F if silicone filled).
  • Temperature Ranges: See inside back cover of temperature catalog for the complete list of ranges.
  • Case Rating: IP67, NEMA 6 Rated (Hermetically sealed per ASME B40.3)
  • Lens: Glass (std), Acrylic, Polycarbonate, Tempered Glass, Laminated Safety Glass
  • Immersion: Minimum 2” in liquid, and 4” in gas for most ranges. Certain ranges require up to 4” in liquids & 5” in gas
  • Mounting Connection: 1/2” NPT (std), 1/4” NPT, 3/4” NPT, Plain Hex Bushing, 1/2” BSPT, 1/2” NPT Union, Sanitary Tri-Clamp®
  • Temperature Sensing Area: Last 2” to 4” of the stem

Note:

Thermowells should be used whenever the stem or bulb would be exposed to pressure,

corrosion, velocity, abrasion or shear forces.

Thermowells also make it possible to remove the thermometer,

without losing pressure or the contents of the process.

SI-WSS Back Connect Bimetal Thermometer Applications

General process instrumentation in the chemical, petrochemical,

oil and gas, energy and water/wastewater industries

Temperature measurement in harsh and aggressive environments

With liquid dampening suitable for applications with high vibrations.

Drawings of SI-WSS Back Connect Bimetal Thermometer

Installation and Use Procedure, All Angle Thermometer

CAUTION:

This thermometer is designed to allow the face to be positioned,

so that it can be easily read.

Sino-Instrument recommends that the thermometer be positioned only one time,

to assure proper performance during its lifetime.

A. Carefully remove the thermometer from the shipping box.

Inspect for any shipping damage. If damaged report it to your freight carrier.

B. Loosen, but do not remove, the bracket set screws (see sketch) so that the bracket can rotate around the stem.

(Do not turn the calibration screw unless calibration is desired).

C. Rotate the bracket by hand so the stem may be flexed in the desired direction. Tighten the “A” bracket set screws.

D. Grasp the head and stem approximately were shown and adjust the head to the desired angle.

E. Tighten the “B” bracket set screws.

F. Install the thermometer into the process fitting or thermowell.

Tighten the hex screw, using an open-end wrench of the appropriate size.

Continue to tighten the hex screw until the head is facing the desired position.

Maintenance of SI-WSS Back Connect Bimetal Thermometer

1) Cleaning:

a) Keep the dial lens clean for proper viewing.

Clean using commercial window cleaner.

b) Periodic cleaning of residue from the stem may be required to ensure thermometer sensitivity if installed without a thermowell. 
2) Calibration:

Periodic calibration should be as determined by the user.

a) Immerse the thermometer stem into a temperature-calibrated medium. Immerse entire stem or 4” (100mm) minimum.

b) Use a small open-end wrench or flat tipped screwdriver to turn the calibration screw.

Turn the calibration screw to adjust the thermometer pointer, to the correct temperature if necessary.

SI-WSS Bimetal Thermometer

If you need the datasheet, price, or more information about SI-WSS Bottom Connect Bimetal Thermometer,

Just Contact Us.

Request a Quote

SI-WSS Bottom Connect Bimetal Thermometer

Sino-Instrument’s Bottom Connect Bimetal Thermometers,

are reliable and accurate temperature sensors requiring no electricity or wiring.

The Bottom Connect Thermometers are ideal for side and elevated installations,

on tops or sides of tanks or pipes and are ideal for local indication.

They can be recalibrated with a turn of the calibration screw on the back of the dial.

A variety of options are available for your specific process needs.

Features of SI-WSS Bottom Connect Bimetal Thermometer

Made to ASME B40.3 Specifications

Accuracy ± 2% Full Scale (ASME B40.3 Grade A)

All Stainless Steel Construction

Hermetically Sealed (ASME B40.3)

Silicone Fillable for Vibration

Standard and Custom Stem Lengths

Standard External Reset for Easy Calibration

OEM Logo Dials/Custom Dials

Applications of SI-WSS Bottom Connect Bimetal Thermometer

SI-WSS series bimetal thermometers are designed for light industry,

HVAC use, especially for refrigeration and hot water.

Specifications of SI-WSS Bottom Connect Bimetal Thermometer

  • Accuracy: ± 1.5% Full Scale (ASME B40.3 Grade A)
  • Dial Size:  63 up to 150 mm
  • Dial Material:
    • Anodized aluminum with black marks on satin matte finish background;
    • White or Hi-Vis™ background available.
  • Stem Length:  2.5 – 24″, other lengths available
  • Stem Diameter: 1/4” (std)
  • Head, Bezel, Mounting Bushing, Stems: 300 Series SS, 316SS (optional)
  • Operating Conditions: 
    • The head temperature should not exceed 200°F (150°F if silicone filled).
    • The stem should not be exposed to continuous temperatures exceeding 50% over-range or 800°F(550°F if silicone filled).
  • Temperature Ranges: See inside back cover of temperature catalog for the complete list of ranges.
  • Case Rating: IP67, NEMA 6 Rated (Hermetically sealed per ASME B40.3)
  • Lens: Glass (std), Acrylic, Polycarbonate, Tempered Glass, Laminated Safety Glass
  • Immersion: Minimum 2” in liquid, and 4” in gas for most ranges. Certain ranges require up to 4” in liquids & 5” in gas
  • Mounting Connection: 1/2” NPT (std), 1/4” NPT, 3/4” NPT, Plain Hex Bushing, 1/2” BSPT, 1/2” NPT Union, Sanitary Tri-Clamp®
  • Temperature Sensing Area: Last 2” to 4” of the stem

Note:

Thermowells should be used whenever the stem or bulb would be exposed to pressure,

corrosion, velocity, abrasion or shear forces.

Thermowells also make it possible to remove the thermometer,

without losing pressure or the contents of the process.

Drawings of SI-WSS Bottom Connect Bimetal Thermometer

Extended reading:  Tri Clamp Sanitary Thermometers

Installation and Use Procedure, All Angle Thermometer

CAUTION:

This thermometer is designed to allow the face to be positioned,

so that it can be easily read.

Sino-Instrument recommends that the thermometer be positioned only one time,

to assure proper performance during its lifetime.

A. Carefully remove the thermometer from the shipping box.

Inspect for any shipping damage. If damaged report it to your freight carrier.

B. Loosen, but do not remove, the bracket set screws (see sketch) so that the bracket can rotate around the stem.

(Do not turn the calibration screw unless calibration is desired).

C. Rotate the bracket by hand so the stem may be flexed in the desired direction. Tighten the “A” bracket set screws.

D. Grasp the head and stem approximately were shown and adjust the head to the desired angle.

E. Tighten the “B” bracket set screws.

F. Install the thermometer into the process fitting or thermowell.

Tighten the hex screw, using an open-end wrench of the appropriate size.

Continue to tighten the hex screw until the head is facing the desired position.

Maintenance of SI-WSS Bottom Connect Bimetal Thermometer

1) Cleaning:

a) Keep the dial lens clean for proper viewing.

Clean using commercial window cleaner.

b) Periodic cleaning of residue from the stem may be required to ensure thermometer sensitivity if installed without a thermowell. 
2) Calibration:

Periodic calibration should be as determined by the user.

a) Immerse the thermometer stem into a temperature-calibrated medium. Immerse entire stem or 4” (100mm) minimum.

b) Use a small open-end wrench or flat tipped screwdriver to turn the calibration screw.

Turn the calibration screw to adjust the thermometer pointer, to the correct temperature if necessary.

SI-WSS Bimetal Thermometer

If you need the datasheet, price, or more information about SI-WSS Bottom Connect Bimetal Thermometer,

Just Contact Us.

Request a Quote

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SI-WSS Adjustable Angle Bi-Metal Thermometer

What Is a Bi-Metal Thermometer?

The bi-metal thermometer is a simple, durable, and inexpensive temperature measuring device. The bimetal thermometer combines two different metals with linear expansion coefficients. Different metals expand at different rates when heated. The bimetallic strip particles deflect to indicate the temperature. Therefore, bi-metal thermometers are also called dial thermometers.

WSS series bi-metal thermometer is an on-site detection instrument for measuring low and medium temperatures. Directly measure the temperature of fluid, steam, and gas in the range of -80℃~500℃. The structure of the bimetal thermometer is divided into radial, axial and universal.

Features of SI-WSS Adjustable Angle Bi-metal Thermometer

  1. WSS bimetal thermometer is waterproof and dustproof to IP65.
  2. It is anti-corrosion and anti-vibration. The whole instrument is made of stainless steel. It is suitable for corrosive occasions.
  3. The dial of the oil-filled bimetallic thermometer is filled with oil, which increases the damping of the pointer and plays a seismic effect.
  4. When the hot-jacket bimetal thermometer needs to be replaced when the equipment is overhauled or the bimetal thermometer is damaged, there is no need to cool down, reduce pressure, or stop the machine. You only need to remove the watch core. The enterprise can avoid unnecessary economic losses. Continuous production can be achieved.
  5. The electrical contact bimetal thermometer has a mechanical electrical contact device. When the temperature of the measured medium changes. The thin shaft on the free end drives the pointer and the movable contact to rotate. The temperature change value is indicated on the dial. When it is with The instant when the fixed contact is contacted or disconnected. The relay and contactor in the external circuit system are activated to achieve the purpose of automatic control and alarm.
  6. This instrument has reliable structure, novel appearance, light weight and beautiful appearance.

Adjustable Bimetal Thermometer Specifications:

  • Accuracy: ± 1.5% Full Scale (ASME B40.3 Grade A)
  • Dial Size:  63 up to 150 mm
  • Dial Material:
    • Anodized aluminum with black marks on satin matte finish background;
    • White or Hi-Vis™ background available.
  • Stem Length:  2.5 – 24″, other lengths available
  • Stem Diameter: 1/4” (std)
  • Head, Bezel, Mounting Bushing, Stems: 300 Series SS, 316SS (optional)
  • Operating Conditions: 
    • The head temperature should not exceed 200°F (150°F if silicone filled).
    • The stem should not be exposed to continuous temperatures exceeding 50% over-range or 800°F(550°F if silicone filled).
  • Temperature Ranges: See inside back cover of temperature catalog for the complete list of ranges.
  • Case Rating: IP67, NEMA 6 Rated (Hermetically sealed per ASME B40.3)
  • Lens: Glass (std), Acrylic, Polycarbonate, Tempered Glass, Laminated Safety Glass
  • Immersion: Minimum 2” in liquid, and 4” in gas for most ranges. Certain ranges require up to 4” in liquids & 5” in gas
  • Mounting Connection: 1/2” NPT (std), 1/4” NPT, 3/4” NPT, Plain Hex Bushing, 1/2” BSPT, 1/2” NPT Union, Sanitary Tri-Clamp®
  • Temperature Sensing Area: Last 2” to 4” of the stem

Note:

Thermowells should be used whenever the stem or bulb would be exposed to pressure, corrosion, velocity, abrasion or shear forces.

Thermowells also make it possible to remove the thermometer, without losing pressure or the contents of the process.

Measuring range °C Scope of application
Industrial, commercial Laboratory, small
-80~+40
-40~+80
0~50
0~100
0~150
0~200
0~300
0~400
0~500

Drawings of Adjustable Angle Bimetal Thermometer

Form A B C E L d
Axial type 65 23 73 75
100
150
200
300
400
500
750
1000
Φ6
Φ8
Φ10
105 23 73
155 23 73
Radial type 65 50 110 34
105 50 110 34
105 50 110 34
135°direction 105 23 85
155 23 85
Universal type 105 23 178 120
155 23 178 120

Adjustable Angle Bi-metal Thermometer Applications

The bimetal thermometer is an on-site detection instrument for measuring low and medium temperatures.

The bimetal thermometer can directly measure the temperature of the liquid, steam, and gaseous media in the range of -80℃~+500℃ in various production processes.

The bimetallic thermometer features an on-site temperature display, which is intuitive and convenient. Safe and reliable. long-lasting. It has a variety of structural forms. Can meet different requirements.

Bimetal thermometers are available in axial type, radial type, universal type, and other meter head models. The length of the bimetal thermometer probe can be customized according to customer needs.

The on-site temperature display is intuitive, convenient, safe, and reliable, and has a long service life. The core-pulling thermometer can maintain or replace the movement in a short time without stopping the machine. Axial type, radial type, 135 type, universal type, and other varieties are complete. Adapt to various on-site installation needs.

Extended reading:  Tri Clamp Sanitary Thermometers

Bi-metal Thermometer Order Guide

Model WSS Bimetallic thermometer
Nominal diameter of dial   3 Φ60
  4 Φ100
  5 Φ150
Dial form 0 Axial (straight)
1 Radial (angle type)
2 135° direction (obtuse angle type)
8 Universal (adjustable angle type)
Installation fixed form 0 No fixtures
1 Movable external thread
2 Movable internal thread
3 Fixed thread
4 Fixed flange
5 Ferrule thread
6 Ferrule flange
Form of protection normal type
W Protection type
F Anticorrosive
Model Temperature range Accuracy class Protection tube material Standard Installation fixed form
D L
WSS-480 -80~+40
-40~+80
0~50
0~100
0~150
0~200
0~300
0~400
0~500
1.5 1Cr18Ni9Ti
304
316
316L
Hastelloy C-276
PTFE anti-corrosion
Φ100 75
100
150
200
300
400
500
750
1000
1500
2000
No fixtures
WSS-580 Φ150
WSS-481 Φ100 Movable external thread
WSS-581 Φ150
WSS-482 Φ100 Movable internal thread
WSS-582 Φ150
WSS-483 Φ100 Fixed thread
WSS-583 Φ150
WSS-484 Φ100 Fixed flange
WSS-584 Φ150
WSS-485 Φ100 Ferrule thread
WSS-585 Φ150
WSS-486 Φ100 Ferrule flange
WSS-586 Φ150

Selection instructions:

Please provide the model, dial diameter, accuracy grade, installation and fixing form, temperature measurement range, protective tube material, protective tube diameter, length, or insertion depth.

Selection examples:

Universal bimetal thermometer, dial diameter Φ100, temperature measurement range 0~400℃, level 1.5, movable external thread M27×2, length 450mm WSS-481, 0~400℃, L=450, M27×2, level 1.5

Installation and Use Procedure, All Angle Thermometer

CAUTION:

This thermometer is designed to allow the face to be positioned, so that it can be easily read.

Sino-Instrument recommends that the thermometer be positioned only one time, to assure proper performance during its lifetime.

A. Carefully remove the thermometer from the shipping box.

Inspect for any shipping damage. If damaged report it to your freight carrier.

B. Loosen, but do not remove, the bracket set screws (see sketch) so that the bracket can rotate around the stem.

(Do not turn the calibration screw unless calibration is desired).

C. Rotate the bracket by hand so the stem may be flexed in the desired direction. Tighten the “A” bracket set screws.

D. Grasp the head and stem approximately were shown and adjust the head to the desired angle.

E. Tighten the “B” bracket set screws.

F. Install the thermometer into the process fitting or thermowell.

Tighten the hex screw, using an open-end wrench of the appropriate size.

Continue to tighten the hex screw until the head is facing the desired position.

Maintenance of SI-WSS Adjustable Angle Bimetal Thermometer

1) Cleaning:

a) Keep the dial lens clean for proper viewing.

Clean using commercial window cleaner.

b) Periodic cleaning of residue from the stem may be required to ensure thermometer sensitivity if installed without a thermowell.

2) Calibration:

Periodic calibration should be as determined by the user.

a) Immerse the thermometer stem into a temperature-calibrated medium. Immerse entire stem or 4” (100mm) minimum.

b) Use a small open-end wrench or flat tipped screwdriver to turn the calibration screw.

Turn the calibration screw to adjust the thermometer pointer, to the correct temperature if necessary.

SI-WSS Adjustable Angle Bimetal Thermometer

Frequently
Asked
Questions

The accuracy grade of the bimetal thermometer is divided by its allowable error as a percentage of the dial scale value.

The greater the number of accuracy levels, the greater the allowable error to account for the limit value of the dial scale. The larger the range, the greater the allowable error of the absolute value of the measured temperature value for the same accuracy level.

Class 1.5 and Class 1.0 respectively indicate that the allowable error of the thermometer is ±1.5 and ±1.0% of the range under normal use.

The current 1.5-level accuracy has been able to meet the measurement needs of most customers.

The bimetallic thermometer uses a hot bimetallic piece wound into a threaded shape as a temperature-sensing device. And install it in the protective sleeve. One end is fixed, called the fixed end. The other end is connected to a thin shaft, called the free end.

A pointer is provided on the free end spool.

When the temperature changes, the free end of the temperature sensing device rotates accordingly. Drive the pointer on the thin shaft to produce angle changes. Indicate the corresponding temperature on the dial.

The temperature measurement range is -80~600C, which is suitable for temperature measurement when the precision is not high in the industry. As a kind of temperature sensing element, the bimetal can also be used for automatic temperature control.

The bimetal thermometer reads quickly. Real-time measurement is achieved. Therefore, bimetal thermometers have been widely used in industrial production and manufacturing.

At the same time, because it uses metal materials to measure temperature, because of the high melting point performance of the metal itself. Can withstand very high temperatures. Therefore, the measurement effect of this temperature under high-temperature conditions is particularly excellent.

Much high-temperature liquid, gas, and other medium temperature tests. Will use this WSS series bimetal thermometer to measure temperature.

Most bimetal thermometers are pointer type. The temperature is displayed in time.
Of course, with the development of products, bimetal thermometers with digital display have appeared. It is more convenient for users to read.

If you need the datasheet, price, or more information about SI-WSS Adjustable Angle Bimetal Thermometer,

Just Contact Us.

Request a Quote

WZP PT100 Series Assembled Thermal Resistance

WZP PT100 is an industrial thermal resistance. It is used as a sensor for measuring temperature, and it is used in conjunction with display instruments, recording instruments and electronic regulators.

WZP PT100 industrial thermal resistance is the most commonly used temperature detector in the middle and low temperature areas. The main features are high measurement accuracy and stable performance. Among them, the measurement accuracy of platinum thermal resistance is the highest. It is not only widely used in industrial temperature measurement, but also made into a standard reference instrument.

WZP thermal resistance range specification

Thermal resistance

type

Temperature range °C

Graduation

Allowable deviation t

 

WZP platinum resistance

 

 

-200-420

 

Pt 100

Class B

Allow ± (0.30+0.005 t )

Grade A (-200-650°C)

Allow ± (0.15+0.002 t )

WZC copper resistance

 

 150-100

Cu50

-50-100tolerance

±(0.30+6.0x10-3t)

Note:   ︱ t ︱  is the absolute value of the humidity measured by the hygrometer;

More About WZP PT100

PT100 and RTD are both temperature sensors, but PT100 specifically refers to a type of RTD (Resistance Temperature Detector).

RTD is a type of temperature sensor that works by measuring changes in electrical resistance as temperature changes. PT100 RTDs have a resistance of 100 ohms at 0 degrees Celsius, which makes them a common choice for temperature measurement in industrial and scientific applications.

So, PT100 is just one type of RTD sensor that has a specific resistance value at a specific temperature.

A PT100 temperature sensor is a type of temperature sensor that measures temperature by detecting changes in electrical resistance. Specifically, it is an RTD (Resistance Temperature Detector) that has a resistance of 100 ohms at 0 degrees Celsius.

As the temperature changes, the resistance of the sensor also changes in a predictable way, allowing the sensor to accurately measure the temperature. PT100 sensors are commonly used in industrial and scientific applications where precise temperature measurement is important.

PTC and PT100 are both types of temperature sensors, but they work in different ways.

PTC stands for Positive Temperature Coefficient, and it is a type of thermistor that increases in resistance as temperature increases. In other words, the resistance of a PTC sensor goes up as the temperature it is measuring goes up. PTC sensors are commonly used in applications such as over-temperature protection in electronic circuits.

PT100, on the other hand, is a type of RTD (Resistance Temperature Detector) that has a specific resistance value of 100 ohms at 0 degrees Celsius. As temperature changes, the resistance of a PT100 sensor changes in a predictable way, allowing it to accurately measure temperature. PT100 sensors are commonly used in industrial and scientific applications where precise temperature measurement is important.

So, the main difference between PTC and PT100 is that PTC sensors increase in resistance as temperature increases. While PT100 sensors have a specific resistance value at a specific temperature and change resistance in a predictable way as temperature changes.

Calibrating a PT100 temperature sensor involves comparing its readings to known, accurate temperatures and making adjustments to the sensor’s output to ensure it is reading accurately.

Here are the basic steps for calibrating a PT100 sensor:

  1. Obtain a reference thermometer or other temperature calibration device with a known, accurate temperature reading.
  2. Place the reference thermometer and the PT100 sensor in a controlled environment with a stable temperature.
  3. Wait for the temperature to stabilize and record the readings from both the reference thermometer and the PT100 sensor.
  4. Compare the readings and calculate the difference between the two.
  5. Adjust the output of the PT100 sensor as needed to match the reference thermometer reading.
  6. Repeat the process at several different temperatures to ensure accuracy across a range of temperatures.

It’s important to note that calibrating a PT100 sensor can be a complex and technical process. And it may be best to consult with a professional or use specialized calibration equipment to ensure accurate results.

Here are some key differences between RTD temperature sensors and thermocouples:

RTD Temperature SensorsThermocouples
Higher accuracy and repeatability;
Smaller temperature range;
Less susceptible to EMI;
More stable over time and exhibit less drift;
Require a stable, regulated power source to operate;
Can be more expensive;
Wider temperature range;
Can operate in harsher environments;
Do not require a power source to operate;
Can be less expensive;
More susceptible to EMI;
Can exhibit more drift and require frequent calibration;

Read more about: RTD Working Principle & Thermocouple Working Principle

Order Guide

W

Z

Spec

Content

 

 

P

 

Pt resistance

C

 

Cu resistance

 

 

 

 

 

 

 

 

Thermal resistance material

 

 

 

 

 

 

 

 

 

1

 

Without fixed device

2

 

Fixed threaded

3

 

Movable flange

4

 

Fixed flange

5

 

Loose coupling type

6

 

Fixed thread conical

7

 

Direct coupling type

8

 

Fixed threaded pipe joint type

9

 

Movable threaded pipe joint type

 

 

 

Fixed installation form

2

 

Splash proof

3

 

Waterproof type

4

 

Explosiveproof type

 

Junction box form

0

Φ16mm protection tube

1

Φ12mm protection tube

Protection tube diameter

No unified designAll kinds of protection tube

W

Z

P

 

3

3

0

1

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Industrial thermal resistance has the characteristics of high sensitivity and good stability and is widely used. If equipped with corrosion protection tube. Can also be used in corrosive media.

We produce two types of assembled thermal industrial thermometers: WZP PT100 and Pt 10 platinum thermal resistances that meet the professional standard JB/T8622- 1997 (equivalent to the International Electrotechnical Commission IEC751-83 standard) and Cu50 and Cu100 that meet the professional standard JB/T8623- 1997 Copper thermal resistance.

If you need WZP PT100 Series Assembled Thermal Resistance, Please feel free to contact our sales engineers.

Request a Quote

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SI-SBW Temperature Transmitter 4-20mA

Temperature Transmitters (4-20mA), also known as thermocouple temperature transmitter, or thermal resistance temperature transmitter, are sensors with an electrical transmission output.

From wall mounted to PC programmable, to LCD Display, to intrinsically safe models,

there are a variety of transmitters to choose from.

Sino-Instrument’s economical devices provide accuracy and reliability at the lowest possible cost.

Features of temperature transmitter 4-20mA

  1. Ultra-small (module φ44×18) integration, strong versatility
  2. Two-wire system 4~20mA DC output. The transmission distance is long and the anti-interference ability is strong.
  3. Cold end, temperature drift, non-linear automatic compensation.
  4. High measurement accuracy and good long-term stability.
  5. The temperature module is internally filled with epoxy resin casting technology,
    • which is suitable for use in various harsh and dangerous places.
  6. Integrated design, simple and reasonable structure, can directly replace the ordinary assembled thermocouple, thermal resistance.
  7. Mechanical protection IP65
  8. Using thermocouple temperature change, can eliminate the use of compensation wires, reduce costs
  9. LCD, digital tube, pointer and other indication functions are convenient for on-site monitoring.
  10. When the ambient temperature is >70 °C,
    • the transmitter and field display instrument can be installed in separate (isolated) mode.

SI-SBW integrated temperature transmitter 4-20mA

SBWR thermocouple temperature transmitter,

and SBWZ thermal resistance temperature transmitter,

are field-mounted temperature transmitter units,

in thermocouple and thermal resistance series instruments.

SI-SBW Temperature Transmitter 4-20mA

The SI-SBW series integrated temperature transmitter,

is a perfect combination of temperature sensor and transmitter.

It converts the temperature signal in the range of -200~+1600 °C,

into two-wire 4~20mA DC signal transmission in a very simple way.

Accurate measurement and control of temperature for displays, regulators, recorders, DCS, etc.

Extended reading: How to convert a 4-20mA to 0-10V /1-5V signal?

Technical Parameters of temperature transmitter 4-20mA

  • Input:
    • Thermal resistance Pt100, Cu50, Cu100         
    • Thermocouple K, E, S, B, T, J, N2.
  • Output: 2-wire system 4-20mA DC.
    • Output 4~20mA DC signal in the range can be linear with the output resistance signal of the RTD thermometer,
    • Linear with the input temperature signal of the RTD thermometer;
    • Linear with the thermocouple input millivolt signal, or with thermoelectric.
    • The input temperature signal of the oven thermometer is linear.
  • The basic error: 0.1 level, 0.25 level, 0.5 level
  • Transmission method: two-wire system
  • The transmitter working power supply voltage minimum 12V, the highest 35V, rated working voltage 24V.
  • Load: the limit of negative two-load resistance is calculated by the following formula(max)=50×(Vmm-12)
    • That is, the load resistance can be selected from 0 to 600 Ω at 24 V) rated load 250 Ω.
    • Note: The range-adjustable transmitter needs to be repeatedly debugged when changing the range of zero and full scale; t
    • he galvanic transmitter must be warmed up for 30 minutes before commissioning.
  • The ambient temperature impact ≤ 0.05% 1 ° C
  • Normal working environment:
    • a, ambient temperature -25 ° C ~ +80 ° C  
    • b, relative humidity 5% to 95%  
    • c, mechanical vibration f ≤ 55Hz amplitude <0.15mm
  • Explosion-proof grade: EXdIIBT4, EXdIIBT6, EXdIICT6.
  • Protection level: IP54

To select a temperature transmitter you need to know the following parameters:

SI-SBW Temperature Transmitter 4-20mA

1, Temperature range:

2. Sensor index number:

Thermal resistance: PT100 Thermocouple: K S B

3. The accuracy requirements of the temperature transmitter:

A. sensor accuracy:

1) PT100-A grade

2) K S B -I class IIB, transmission accuracy:

0.5 level 0.3 level 0.2 level 0.1 level (thermocouple is 0.5 level)

4, output signal and function:

The output signal is generally 4~20mA output, and the function is with HART protocol RS485 communication.

5, Sensor connection and size: thread, flange, etc.

6, The depth of the sensor insertion depth mm

7, The diameter of the sensor mm:

8. Material requirements for sensors and installation methods

9. Whether the site environment needs explosion-proof

10. Whether there are interferences such as walkie-talkies, inverters, and high-power motors at the use site.

Extended reading: RTD vs. Thermocouple: What’s the Difference, and Which Should You Use?

Sino-Instrument Integrated temperature transmitter series products:

digital integrated temperature transmitter,

integrated temperature transmitter with HART protocol,

thermocouple integrated temperature transmitter,

thermal resistance integrated temperature transmitter,

intelligent temperature change Send the device, etc.

Request a Quote

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SI-3151GP Capacitive Gauge Pressure Transducer

Gauge Pressure Sensor (GP) is a pressure transmitter for Gauge pressure measurement. SI-3151GP Capacitive Gauge Pressure Transducers use capacitive sensing elements to measure gauge pressure.

Gauge pressure (GP) transmitters compare process pressure with local ambient air pressure. Gauge pressure transmitters have ports for a real-time sampling of ambient air pressure. There are different types of pressure measurement. Such as gauge pressure, absolute and differential pressure measurement. Among them, the gauge pressure measurement is performed using a gauge pressure transmitter. These devices are designed to measure pressure relative to ambient atmospheric pressure. The output of the gauge pressure sensor will vary depending on the atmosphere or different altitudes. Measurements above ambient pressure are expressed as positive numbers. And negative numbers indicate measurements below ambient pressure. At Sino-Inst, we offer gauge pressure transmitters for a variety of industrial applications.

Sino-Inst offers a variety of Gauge Pressure Transmitter for industrial pressure measurement. If you have any questions, please contact our sales engineers.

Features of 3151GP gauge pressure transmitter

  • High-reliability micro-capacitance silicon cell
  • Long Term stability: +/- 0.1% URL / 10 Years
  • High accuracy, up to +/-0.04% of calibrated span (0.065% as standard)
  • Versatile indicator with push-button programming
  • Exceptional resistance to harsh environments
  • Hart® 5.2 multi-drop communication
  • Field repair possible with common spare parts
  • The built-in loop calibration facility
  • Large installed base
  • Exia “Intrinsically safe” or Exd “Explosion proof” versions ex stock
  • SIL2 (EN61508)

Specifications of 3151 gage pressure(GP) transmitter

Model3151GP
Measurement span0-0.10~3.5kPa(0-10~350mmH2O)
0-0.8~8.0kPa(0-80~800mmH2O)
0-4.0~40kPa(0-400~4000mmH2O)
0-20~200kPa(0-2000~20000mmH2O)
0-70~700kPa(0-0.7~7kgf/cm2)
0-210~2100kPa(0-2.1~21kgf/cm2)
0-700~7000kPa(0-7.0~70kgf/cm2)
0-2.1~21MPa(0-21~210kgf/cm2)
0-4.1~41MPa(0-41~4100kgf/cm2)
Reference accuracy
(Varies by material and measurement span)
± 0.1%, ±0.075%
Fill fluidSilicone oil (general purpose models), fluorine oil (oxygen and chlorine models)
Waterproof and dust-proof constructionIEC IP66/IP67
Explosion-proof constructionTIIS flameproof (Exd IICT4)
KOSHA flameproof
FM explosion proof, intrinsic safe and Nonincendive
ATEX/NEPSI/IECEx flameproof, intrinsic safe and Type n
INMETRO flameproof
Wetted materialSUS316 (diaphragm SUS316L), Hastelloy C, Tantalum
Power17.9 to 42V DC
Output signal4 to 20 mA DC (SFN communication)
4 to 20 mA DC (HART® communication)
MODBUS-485 signal
Process connectionsRc 1/2 or 1/2 NPT internal thread
Safety certificationSafety Integrity Level (SIL) 2 certification

By selecting from a large range of materials, we are able to customize the transmitter and supply remote seals.

We temperature compensate for the whole assembly to maintain the highest level of performance.

Selecting from 316SS, Hastelloy, Monel, Tantalum, Gold, and Ceramic.

We can custom build a transmitter to our own high standards, or to your individual specifications.

To provide high flexibility, remote seals can be fitted to any of the SI series of transmitters.

For further information, please Contact us.

Gauge Pressure Sensor Applications

Pressure transmitters are used to measure level, density, and pressure of liquids, gases or vapors. And then converted to a 4-20 mA DC signal output. The SI-3151 GP intelligent pressure transmitter can communicate with the HART Communicator.

There are many types of pressure sensors, which are widely used in:

Water plants. Oil refineries. Sewage treatment plants. Building materials. Light industry. Machinery and other industrial fields.

To achieve the measurement of liquid, gas, steam pressure.

However, different pressure sensors are required for different applications.

The pressure sensor can be used to measure some mechanical physical quantities such as: Displacement. Vibration. Angular velocity and acceleration.

It is also widely used in the measurement of thermal engineering parameters such as: Pressure. Differential pressure. Liquid pressure. And content of ingredients.

Gauge Pressure Sensor working principle

What is gauge pressure?

Gauge pressure, also known as ‘relative pressure’ or ‘vented gauge pressure’. Gauge pressure is the measurement of pressure relative to atmospheric or barometric pressure.Gauge pressure sensor has the back of the sensing element open (or ‘vented’), to provide a reference to atmospheric.
More about the Difference between absolute, gage and differential pressure.

How does a gauge pressure sensor work?

Gauge Pressure Transmitter / transducer (GP) is a pressure transmitter for Gauge pressure measurement. According to the measurement principle, it can be divided into: capacitive and diffused silicon.

Capacitive pressure sensor (capacitive type pressure transducer) is a pressure sensor that uses a capacitive sensing element to convert the measured pressure into an electrical output with a certain relationship. It is characterized by low input energy, high dynamic response, small natural effects, and good environmental adaptability. It generally uses a round metal film or metal-plated film as an electrode of the capacitor. When the membrane is deformed by pressure, the capacitance formed between the membrane and the fixed electrode changes. Through the measuring circuit, the electrical signal with a certain relationship with the voltage can be output. Capacitive pressure sensor is a capacitive sensor with variable pole distance. It can be divided into single capacitive pressure sensor and differential capacitive pressure sensor.

Read more about: What is the capacitive pressure transducer?

SMT3151 TGP-Gauge Pressure Transmitter / Transducer is a diffusion silicon pressure transmitter. The working principle of the diffused silicon pressure sensor is based on the piezoresistive effect. Using the principle of piezoresistive effect, the pressure of the measured medium directly acts on the diaphragm of the sensor (stainless steel or ceramic). Make the diaphragm produce a slight displacement proportional to the pressure of the medium. To change the resistance value of the sensor. Use electronic circuits to detect this change. And convert and output a standard measurement signal corresponding to this pressure.

3151 gage pressure transmitter

Gauge vs Absolute Pressure Sensor

In terms of pressure type, pressure sensors can be divided into gauge pressure, absolute pressure, and negative pressure.

Absolute pressure: Absolute pressure for short, is the pressure calculated from the absolute zero pressure or the vacuum starting point.

Gage pressure: refers to the pressure calculated from the atmospheric pressure of a specific place at a specific time as a starting point. Atmospheric pressure at the same location will change slightly.

Vacuum: When the measured absolute pressure is less than atmospheric pressure, the difference between the measured absolute pressure and absolute vacuum.

Negative pressure: when the measured absolute pressure is less than atmospheric pressure, the difference between the current atmospheric pressure and the measured absolute pressure, referred to as negative pressure.

The formula for the relationship between absolute pressure, gauge pressure, and atmospheric pressure: absolute pressure = gauge pressure + atmospheric pressure.

Therefore, when selecting a pressure sensor, it is generally necessary to clearly indicate the pressure type of the pressure sensor,

Gauge vs Absolute Pressure Sensor

  1. Gauge pressure and absolute pressure are based on different measurement reference points. The reference point for gauge pressure measurement is the local atmospheric pressure. Absolute pressure is the absolute vacuum zero. Absolute pressure sensors cannot replace gauge pressure sensors.
  2. In layman’s terms. When your measured object uses atmospheric pressure as the reference point, and only has the inflation action, select the gauge pressure type. When your measured object takes absolute vacuum zero as the reference point, and there are inflation and inhalation actions, it is often the absolute pressure type.
  3. The two principles of gauge pressure and absolute pressure sensor are different! Cannot be used instead!

Technical Support

Cryogenic Pressure Transducers

Cryogenic pressure transducer for low temperature pressure measurement.  -196℃~+125℃、-260℃/-350c(especial). Sino-Inst offers a variety of Pressure Sensors for…

Sino-Instrument Gauge Pressure Transmitters, made in China, are high-performance cost-effective devices, used where long term accuracy and reliability is a priority.

SI-3151GP Advanced Transmitter Gauge Pressure Transmitters, are used to measure the pressure of gases, liquids, and steam, as well as to measure tank pressure and fluid levels.
Sino-Instrument 1151 Gauge Pressure Transmitters are high-performance cost effective devices used, where long term accuracy and reliability is a priority.
We also offer Gauge Pressure Transmitter SMT3151 TGP, for the process, oil and gas industry.

Request a Quote

More Featured Products:

Venturi Flow Meter

Venturi flow meter is also called classical venturi, and is used to call venturi meter, standard venturi. It is used to measure the flow of single-phase stable fluid in closed pipelines.

Venturi flow meter is a flow measurement method based on the principle of differential pressure. Commonly used to measure the flow of fluids such as air, natural gas, coal gas, and water. In the standard throttling device, the upstream and downstream straight pipe sections required by it are short. The lasting pressure loss is small, the performance is stable, and the maintenance is convenient.

Sino-Inst, Manufacturer for differential pressure flow meters. Including the Orifice plate, Venturi, Annubar, etc. Suitable for liquid, gas, and steam flow measurement. Please contact our sales engineers for technical support!

Features of Venturi flow meter

  • Less head loss than an orifice or nozzle meter, due to the streamlined design
  • Ideal for clear gas, liquid or steam applications
  • Available in many materials and end arrangements
  • Can be equipped with fittings to accept secondary instrumentation packages

The classic venturi tube is simple, durable and stable in performance.

Classic venturi pressure loss is small, saving the energy needed for fluid delivery.

Classic venturi tube in the range of 50 ~ 1200.

No real-flow calibration is required.

Beyond this range, you can refer to the design and manufacture.

When high precision is required, real-time calibration is possible.

The body is installed in long size, and it is not convenient for transportation and installation for large-diameter instruments.

What is a venturi flow meter?

Venturi flowmeter, also known as venturi tube flow meter. It is a commonly used device for measuring the flow of pressurized pipelines.

It is a differential pressure flowmeter, and is commonly used to measure the flow of air, natural gas, gas, water, and other fluids.

It consists of a “contraction section”, a “throat” and a “diffusion section”, which are installed on the pipe where the flow rate needs to be measured.

The classic venturi tube is designed and manufactured, according to China GB/T2624-93, and is verified according to the verification procedure JJG640-94.

In the standard throttling device, it requires the shortest upstream and downstream straight pipes, the lowest pressure loss, stable performance, and convenient maintenance.

Because of its accurate calculation and low energy consumption, it has been widely used in petroleum, chemical, electric power, and metallurgy industries.

Venturi flow meter parameters:

1. Nominal diameter: 50mm≤DN≤1200mm (more than this range needs to be calibrated)                 

Roughcasting shrinkage section: 100mm ≤ DN ≤800mm                

Mechanical processing shrinkage section: 50mm ≤ DN ≤ 250mm                 

Shrinking section of rough welded iron plate: 200mm≤DN≤1200mm

2. Throttle aperture ratio β: 0.3 ≤ β ≤ 0.75                    

Roughcast shrinkage segment: 0.3 ≤ β ≤ 0.75                   

Machining shrinkage section: 0.4 ≤ β ≤ 0.75                    

Coarse section of rough welded iron plate: 0.4≤β≤0.7

3. Reynolds number range: 2 × 10 5 ≤ ReD ≤ 2 × 10 6                  

Rough cast shrinkage section: 2 × 10 5 ≤ ReD ≤ 2 × 10 6                   

Machining shrinkage section: 2 × 10 5 ≤ ReD ≤ 2 × 10 6                   

Shrinkage section of rough welded iron plate: 2×10 5≤ReD≤2×10 6

4. Accuracy level: 1

Venturi Flow Meter PDF

Classic venturi flowmeter structure

venturi flowmeter structure

The axial section of the classic venturi is shown in the figure above.

It is composed of an inlet cylinder section A, a conical contraction section B, a cylindrical throat C, and a conical diffusion section E.

The diameter of the cylinder section A is D, the length is equal to D. The contraction section B is conical and has an angle of 21 ° ± 1 °. The throat C is a cylindrical shape of diameter d, the length of which is equal to d;

E is conical and has a diffusion angle of 7° to 15°.

The constricted section of the classic venturi is divided into three forms: a coarse cast shrinkage section, a machined shrinkage section, and a coarse welded iron plate shrinkage section.

The upper-pressure port and the throat pressure port of the classic venturi, are made into several (not less than four) separate tube wall pressure ports.

And several separate tube walls are pressure-connected by a pressure-equalizing ring.

When d≥33.3mm, the diameter of the throat pressure port is 4~10mm, the diameter of the upstream pressure port should be no more than 0.1D. When d≤33.3mm, the diameter of the throat pressure port is 0.1d~0.13d. The diameter of the upstream pressure tap is 0.1d to 0.1D.

Extended reading: How to realize the flow accumulation function in PLC?

Venturi meter working principle

Venturi flowmeter working principle

The Venturi flow meter produces a differential pressure, to calculate the flow rate through a pipe.

The meter works by measuring the pressure of fluid before and after it passes through a narrow tube; the pressure difference indicates the volumetric rate of flow.

The basic measurement principle of the new generation, of differential pressure flow measuring instruments, is the flow measurement method based on the law of conservation of energy – the primary effort equation and the flow continuity equation.



The inner venturi consists of a circular measuring tube, and a special core placed in the measuring tube and coaxial with the measuring tube.

The outer surface of the special core has a geometric profile, similar to the inner surface of a classic venturi. And forms a different diameter annular flow gap with the inner surface of the measuring tube.

How does a Venturi meter work?

The working of venturi meter is based on the principle of Bernoulli’s equation.

Bernoulli’s Statement: 

It states that in a steady, ideal flow of an incompressible fluid, the total energy at any point of the fluid is constant.

The total energy consists of pressure energy, kinetic energy, and potential energy or datum energy.

Mathematically:

Here all the energies are taken per unit weight of the fluid.

The Bernoulli’s equation for the fluid passing through the section 1 and 2 are given by

Flow tools:

DP Flow Meter Output CalculatorFlow Meter 4-20mA Current Output CalculatorFlow Velocity & Pipe Diameter to Volumetric Flow Rate Calculator
Mass Flow & Density to Volume Flow CalculatorMass Flow Rate Unit ConverterVolume Flow Rate Converter
Volume Flow & Density to Mass Flow CalculatorVolumetric Flow Rate & Pipe Diameter to Flow Speed Calculator

Venturi Flow Meter Applications

Since its development, venturi products have been successfully applied to the measurement of high-humidity natural gas, low-pressure dirty biogas, coke oven gas, gas, steam, hot water, high-temperature hot kerosene, etc., And the practical application range is rapidly expanding.

Besides, the venturi tube has a unique measurement advantage, for measuring conditions such as long straight pipe installation conditions, special high temperature, high pressure, strong corrosive and dirty media, and non-single phase flow measurement.

Of course, in the sewage and wastewater treatment industry, in addition to venturi flowmeters, electromagnetic flowmeters are also the first consideration for many users.
For example, if you need to measure the flow of wastewater in a 2-inch pipe. Then you can refer to: Magnetic Flow Meters Guides.

Extended reading:  Flow Nozzle for Steam Flow Measurement

Orifice meter vs Venturi meter

The orifice flow meter is a flowmeter with a variable cross-sectional pressure difference.

The velocity at the vein is the largest, the pressure of the fluid is minimized, the structure is simple, but the resistance loss is large.

The Venturi flow meter is also a flowmeter with a variable cross-section pressure difference.

On the basis of the orifice flowmeter, the orifice plate is replaced by a lengthy and gradually expanding short tube, and the structure is simple, the resistance loss is small, but the cost is high.

The orifice flowmeter is similar to the venturi flowmeter, in terms of working principle. But some of the main differences are that the orifice plate can be easily replaced. Adapting to a wide range of different flow rates, while the venturi’s throat diameter is fixed.

The measured flow rate range is limited by the actual pressure difference.

Due to the vortex on the downstream side of the orifice plate, the permanent loss of the orifice flowmeter is large. And the structural shape of the venturi flowmeter can avoid the formation of vortices.

Thus, permanent losses can be greatly reduced.

Venturi flowmeters consume much less energy in measuring flow than orifice flowmeters.

But because venturi flowmeters are more time consuming and expensive than orifice flowmeters, in manufacturing and processing.

Orifice flowmeters is the least troublesome when installing the pipeline and the lowest cost.

In fluid measurement, venturi flowmeters are typically used for the measurement of gas flow at low flow rates.

The orifice flow coefficient in orifice flowmeters is significantly affected by fluid disturbances, which are generated upstream of the orifice plate.

The influence of valves, elbows and other fittings.

The value of its flow coefficient is less affected by downstream disturbances.

Typically, such flow meters should be installed at 50 and 10 pipes diameters, from the upstream and downstream disturbance components, respectively.

It is obvious that the required distance is related to the nature of the disturbance.

Therefore, when measuring with an orifice flowmeter, the orifice flowmeter must be properly installed according to the disturbance of the fluid.

Through the specific analysis and comparison of the orifice flowmeter and the venturi flowmeter, the advantages and disadvantages between them can be seen. And the user is reminded to analyze and compare more when selecting the flowmeter.

In this way, you can choose the measurement tools you need.

Extended reading: [Working principle&Price]SI3051ANB Annubar Flow Meter

Pitot Tube vs Venturi Meter

Pitot tube flowmeter is a new type of advanced insertion type differential pressure flowmeter. It is designed and manufactured according to the standard of IS03966 “Measurement of Fluid Flow in Closed Pipeline – Velocity Area Method Using Pitot Tube Static Pressure Tube”.

To meet the different measurement requirements of different field conditions, Pitot tube flow sensors are divided into standard and functional structures.

The standard type is suitable for the measurement of pure gas, steam, liquid and various chemical materials and liquids. The function is suitable for the working conditions of easy blockage, adhesion, high impurity content, and solid-liquid mixed flow such as various coal gas in the metallurgical industry. Measurement of gas, steam and various liquids.

Smart Pitoba flowmeter is easy to scale and easy to install. Just make a hole in the pipeline. Insert the Smart Pitoba into the center of the pipeline. Connect it with the pipeline by welding or flange.

The difference between Pitot tube vs venturi meter, in simple terms:

  1. Pitto is taking advantage of the same point.
    The only difference between the total pressure and the static pressure is the dynamic pressure V2/2g to obtain the speed and flow.
  2. The Venturi nozzle is used to pass through two points of variable diameter.
    The measured pressure difference is the dynamic pressure increase (or static pressure decrease).
    List the continuity equation with the product of diameter and velocity.
    Then find the speed and flow.

Frequently
Asked
Questions

Yes, Venturi tubes can measure volume flow. To be precise, the Venturi tube measures differential pressure. The differential pressure signal is transmitted to the integrator or the monitoring system, and the compensation operation is performed. is further converted into traffic. Most customers monitor volume flow.

The Venturi effect, also known as the Venturi effect. This phenomenon is named after its discoverer, the Italian physicist Giovanni Battista Venturi.

This effect is manifested when the restricted flow passes through the narrowed flow section. The flow velocity of the fluid increases, and the flow velocity is inversely proportional to the flow section.

And according to Bernoulli’s law, the increase of flow velocity is accompanied by the decrease of fluid pressure. That is, the common Venturi phenomenon.

In layman’s terms, this effect means that a low pressure will be generated near a fluid flowing at a high speed, resulting in adsorption. Using this effect, a venturi can be made.

Venturi Flow Meter is a device for measuring the flow of a pressure pipeline, which belongs to a differential pressure flowmeter. It is generally installed on the pipeline that needs to measure the flow, and can measure the flow of air, natural gas, gas, water and other fluids.
Venturi Flow Meter is widely used in many energy and power industries such as gas, electricity, cement, etc. due to its simple structure, wide range of applicable working conditions, and easy real-time monitoring.

When the fluid flows through the orifice plate of the orifice flow instrument device, the cross-sectional area decreases and the velocity increases. The corresponding pressure decreases. And the degree of reduction is proportional to the fluid velocity in the flow state.

Therefore, the flow rate can be calculated by detecting the pressure difference, and then the flow rate can be calculated.

Under normal circumstances, if we want to measure differential pressure, we can directly purchase a differential pressure transmitter.

However, in fluid pipelines. The differential pressure of the fluid cannot be measured directly. A throttle is required.

When the differential pressure flowmeter measures the fluid flow parameters, it is based on the differential pressure generated by the throttling part. When the fluid passes through the throttling part, because the pipe section becomes narrower. Therefore, the flow velocity of the fluid in the pipeline increases, and the kinetic energy of the fluid also increases. increased accordingly.

Ideally, when the fluid velocity increases, part of the static pressure will be converted into fluid kinetic energy. The static pressure value of the fluid will decrease accordingly.

At this time, a pressure difference is generated, and there is a certain functional relationship between the pressure difference and the fluid flow. Only by measuring the pressure difference, the flow value of the fluid can be determined.

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Sino-Inst, China, supplies all kinds of Flow Meters. Provide professional flow measurement solutions.

Sino-Inst offers over 50 flow meter products. About 50% of these are differential pressure flow meters (like the Orifice flowmeter), 40% are Magnetic Flow Meters, and 40% are Thermal mass flowmeters.

A wide variety of Annubar flow meter options are available to you, such as free samples, paid samples. 

Sino-Inst is a globally recognized supplier and manufacturer of flow measurement instrumentation, located in China.

The top supplying country is China (Mainland), which supply 100% of the turbine flow meter respectively. Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide.

You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

Request a Quote

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VERIS Verabar Flow Meter

The VERIS Verabar Flow Meter, also called the Verabar Averaging Pitot Tubes, is a kind of differential pressure flow meter.

The SI-VL Verabar Flow Meter is designed with an aerodynamic engineering structure and is a sensor element. The VERIS Verabar Flow Meter is a plug-in flow meter. A Verabar tube sensor is inserted into the pipe. When the fluid flows through the sensor, a high-pressure distribution zone is created in the forward direction of the flow. And a low-pressure distribution zone is created in the rear. Verabar Flow Meter can be used to measure dry gas, humid gas, liquid or vapor, without being limited by dielectric constant.

Sino-Inst, Manufacturer for differential pressure flow meters. Including the Orifice plate, Venturi, Annubar, etc. Suitable for liquid, gas, and steam flow measurement. Please contact our sales engineers for technical support!

Features of VERIS Verabar Flow Meter

  • The measure parts design base on-air dynamic principle
  • The static pressure hole on the back side, produce the static pressure before split point between fluids and transducer, is the stable pulse signal
  • Without removable parts, which can insure long term of the transducer, and also can insure long term stability, eliminate the precision drift
  • Dust prevention. VERIS Verabar flow sensor is installed on both side of the transducer, not sensitive to medium particle and dust
  • Uniform veloc
  • ity tube flow sensor made of special material, in order to meet the demand of corrosive, high temperature, and pressure
  • Easy to install;

SI-VL Verabar flow meter Specifications

  • Applicable pressure: 0~30MPa
  • Applicable temperature: -25 ~ +550 degrees
  • Measurement accuracy: 1.5%
  • Repeatability: 0.5%
  • Sensor material: 304, 316L or special order
  • Pipe size: DN38 ~ DN15000 round pipe or square pipe
  • Turndown ratio: 10:1
  • Flow range: the upper and lower limits of the measurement are at the probe strength and the minimum allowable differential pressure

Verabar flowmeter measures the required minimum flow rate and differential pressure

MediumFlow rateMinimum differential pressure
Gas3.5m/s0.025kpa
Liquid0.6m/s0.25kpa
Steam9.0m/s0.38kpa

VERIS Verabar flow sensors combined with Sino-Inst differential pressure transmitters. Provide the most reliable and accurate DP flow measurement solution on the market.

Differential pressure transmitter is a transmitter that measures the pressure difference between the two ends of the transmitter. The differential pressure transmitter outputs standard signals (eg 4 ~ 20mA, 0 ~ 5V). DP transmitters are different from pressure transmitters as they have 2 pressure interfaces. Differential pressure transmitters are generally divided into positive and negative pressure end. In general, the pressure at the positive end should be greater than the pressure in the negative section to measure. With flanges, capillaries, valve, brackets, throttle devices. Differential pressure transmitters are used to measure the level, density, and pressure of liquids, gases, and vapors. Then convert it into 4–20mADC current signal output.

Extended reading: [Working principle&Price]SI3051ANB Annubar Flow Meter

3-Types of Verabar Flowmeters

SI-VL200 verabar flow meter

SI-VL200 verabar flow meter

The VL200 can be inserted and removed under pressure.

Use this model when you can not shut down the pipe to insert the sensor.

The VL200 is the most frequently sold hot-tap model.

It is available in single rod and double rod units for high pressure.


SI-VL350 verabar flow meter

SI-VL350 verabar flow meter

The VL350 can be inserted and removed under pressure.

The insertion mechanism (Jack) can be removed and used on multiple pipes. 

The Jack can be stored in a dry location away from the elements making it ideal for outdoor and coastal installations.


SI-VL400 verabar flow meter

SI-VL400 verabar flow meter

The VL400 can be inserted and removed under pressure.

Similar to a VL200 except it has a flanged connection to the pipe for added sealing capability. 

When plant regulations require a flanged hot tap connection, the VL400 is the correct model to use.

It is available in single rod and double rod units for high pressure.

VERIS Verabar Flow Meter Structure

The Verabar meter flowmeter consists of a detection rod, pressure tap, and a guide rod.

The cross-sectional shape of the detection tube of Verabar is divided into a variety of structures such as a circle,a diamond shape, and an elliptical shape.

What is Verabar Flow Meter?

The VERIS verabar flow meter is a high precision measuring instrument. Based on the principle of a piton tube measurement and applies the air dynamic theory.

Verabar flow meters belong to differential pressure flow meters, rate average of the flow sensor.

It measure flow rate through the differential, between average total pressure and static pressure, which often is used to measure the flow rate of the liquids, steam, and gas.

Extended reading: What Is A Venturi Flow Meter?

VERIS Verabar flow meter working principle

Verabar flow meter working principle

When the fluid flows through the probe, a high-pressure distribution zone is created at the front.

And the pressure in the high-pressure distribution zone is slightly higher than the static pressure of the pipeline.

According to the Bernoulli equation, the velocity of the fluid flowing through the probe is increased, and a low-pressure distribution zone is generated at the rear of the probe.

The pressure in the low-pressure distribution zone is slightly lower than the static pressure of the pipeline.

The fluid flows from the probe and creates a partial vacuum, at the back of the probe with vortices on either side of the probe.

The cross-sectional shape of the constant velocity flow probe, the rough surface condition and the position of the low-pressure tapping orifice are key factors, in determining probe performance.

The stability and accuracy of the low voltage signal are decisive for the accuracy, and performance of the uniform velocity probe.

The Verabar average velocity probe detects the average differential pressure produced, by the average velocity of the fluid.

The VERIS Verabar average velocity flow probe has multiple pairs of pressure tapping holes, arranged in certain directions in the high and low-pressure areas, which makes it possible to accurately measure the average flow rate.

Applications of Verabar Flow Meter

VERIS Verabar flowmeters are widely used in power plants, petrochemicals, metallurgy, water treatment, fine chemicals, environmental protection and other industries.

Verabar flowmeters are used in a wide range of applications for a wide range of gas, liquid and vapor measurements.

The following are typical application media.

  • Water Treatment
  • Pump Testing
  • Paper & Pulp
  • Effluent Treatment Plants
  • Waste Water & Sewerage
  • Food & Dairy Processing
  • Chemical Process Plants
  • Gas/Liquid/Steam;
  • Natural Gas
  • Cooling Water
  • Saturated Steam;
  • Compressed Air
  • Boiler Water/Superheated Steam;
  • Gas/Demineralized Water;
  • Gas Hydrocarbon/Liquid Hydrocarbon;
  • Hot Air/Cryogenic Liquid;
  • Producer Gas/Thermal Liquid

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Sino-Inst offers over 10 VERIS Verabar flow meter products. These are differential pressure flow meters, 40% are water meters (like the Insertion Turbine Flow Meter), and 40% are water treatment (like the Annubar flow meter ).

A wide variety of VERIS Verabar flow meter options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of VERIS Verabar flow meter, located in China. The top supplying country is China (Mainland), which supply 100% of the VERIS Verabar flow meter respectively.

Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. VERIS Verabar flow meter products are most popular in Domestic Market, Southeast Asia, and Mid East.

You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

Request a Quote

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SI 3051ANB Annubar Flow Meter

Annubar flow meter also known as flute-shaped constant velocity tube flow meter and Toba tube flow meter. Annubar flow meter is a differential pressure flow meter.

Annubar Flow Meter is a no-equal solution with a patented, averaging pitot tube that delivers superior measurement accuracy over a wide flow range. This flow meter can measure multiple variables and is engineered with an integrated thermowell for temperature measurement. Its patented T-shaped sensor is capable of obtaining measurements via a single pipe penetration while maintaining a small profile in the pipe to reduce permanent pressure loss and increase energy savings.

Sino-Inst, Manufacturer for differential pressure flow meters. Including the Orifice plate, Venturi, Annubar, etc. Suitable for liquid, gas, and steam flow measurement. Please contact our sales engineers for technical support!

Features of SI 3051ANB Annubar Flow Meter

  1. Honeycomb hexagonal stable structure,increasing the range ratio.
  2. Suitable for square or rectangular pipes.
  3. For the unavoidable clogging problem of similar products in measuring dirty media, achieve non-stop production maintenance.
  4. Average speed tube + three valve group + temperature pressure compensation + transmitter, form an integrated structure, easy to use.
  5. No flow coefficient drift, long-term stability.
  6. Exclusively provide intuitive resonance check to ensure long-term stable operation.
  7. Low pressure loss, low energy consumption, significant energy saving effect.
  8. Easy to install and save labor, low price and fast delivery (1 week)

Annubar Flow Meters’ technical parameters

  • Suitable for measuring the flow of liquids, gases, and steam.
  • The maximum working temperature of 1300 ° C (with appropriate materials and mounting parts).
  • The highest working pressure up to 400Bar (40MPa)
  • The highest viscosity is 500 cp
  • The length of the upstream and downstream straight pipe sections is required to be short.
  • Standard stainless steel grade.
  • Long-term accuracy is not affected by wear and tear.
  • Specifications: DN50-DN5000 (mm); insert: DN500-DN5000 (mm);
  • Measurement accuracy: ±6.0%; repeatability: ±0.1%;
  • Range:
    • volume flow: 10:1;
    • mass flow: 8:1;4,
    • working pressure: the average speed tube does not propose a functional type: ≤ 20MPa;
    • the average speed tube can be proposed type: ≤ 10MPa;
  • Fluid temperature: ≤ 450 ° C; Medium viscosity: ≤ 30CP (equivalent to heavy oil);
  • Material:
    • Average speed tube, three valve group: various grades of stainless steel (optional);
    • Main pipe, flange: stainless steel or carbon steel (optional);

Application of the Annubar flow meter

The output of the Annubar flowmeter is a differential pressure signal.

It can be used with instruments that measure differential pressure to accurately measure a variety of liquids, gases and vapors (superheated steam and saturated steam) in the He-shaped pipe and rectangular pipe.

The size of the pipe to be tested ranges from 20MM to 5000MM. Annubar has been successfully used in the chemical industry, (including the nuclear industry) chemical industry, petrochemical industry and metal smelting industry.

It is suitable for:

  1. Gas delivery and liquid delivery
  2. Energy research, steam boiler heat rate, pump efficiency.
  3. Gas compressor efficiency and fuel consumption
  4. Process control: input and output, ratio, balance; cooling water or air, steam heating.
  5. Feeding in the chemical industry

The Use and Characteristics of the Annubar flowmeter

The Annubar flowmeter is an ideal substitute for differential pressure fow measurement. Because of its simple installation, low-pressure loss, high strength, no wear and no leakage.

It can be widely used in industrial and mining enterprises to measure the flow of blast furnace gas, compressed air, steam and other liquids and gases.

1. The unique internal secondary average structure provides high precision (±1% reading), and high repeatability (±0.1%).

2. The outer impact tube of the Annubar flowmeter, is processed by a single piece of material without welding.

It has the highest strength, compared with similar products welded by the double-body structure. And it is also convenient to use high-temperature resistance and corrosion resistant material.

Working principle of Annubar flow meter

Annubar flow meter working principle

When the fluid flows through the probe, a high-pressure distribution zone is created at the front. And the pressure in the high-pressure distribution zone is slightly higher than the static pressure of the pipeline.

According to the Bernoulli equation, the velocity of the fluid flowing through the probe is increased. And a low pressure distribution zone is generated at the rear of the probe.

The pressure in the low-pressure distribution zone is slightly lower, than the static pressure of the pipeline.

The fluid flows from the probe and creates a partial vacuum, at the back of the probe with vortices on either side of the probe.

The cross-sectional shape of the constant velocity flow probe, the rough surface condition and the position of the low-pressure tapping orifice are key factors, in determining probe performance.

The stability and accuracy of the low voltage signal, is decisive for the accuracy and performance of the uniform velocity probe.

The Annubar average velocity probe detects the average differential pressure, produced by the average velocity of the fluid.

The Annubar average velocity probe has multiple pairs of pressure tapping holes, arranged in a certain standard in the high and low-pressure zones, making it possible to accurately measure the average flow rate.

Annubar Flow Meter Calculation

The flow calculation formula of the uniform velocity tube flowmeter is derived from the Bernoulli equation and the continuity equation:

Qv=α﹒ ε﹒ (π/4)﹒ D2﹒ (2P/ρ1)0.5
Qm=α﹒ ε﹒ (π/4)﹒ D2﹒ (2?P﹒ρ1)0.5
Among them: Qv: volume flow
Qm: mass flow
α: Sensor structure coefficient
△P: Differential pressure value
ε: fluid expansion coefficient
ρ: Density under fluid conditions
ε: fluid expansion coefficient
For incompressible fluid ε=1, for compressible body ε<1. If D, △P, and ρ1 in the formula all use SI units, the unit of QV is M3∕S. The unit of Qm is ㎏∕S.

How Averaging Pitot Tubes Work-Annubar Technology

Video source: https://www.youtube.com/embed/ofiQPZkGPJM?rel=0

Advantages and Disadvantages of the Annubar flowmeter:

Advantages:

  • Can be inserted through a small opening.
  • Can be used to sample the velocity at several points.
  • Reasonable design, easy installation, and economy
  • Low-pressure drop, minimal obstruction.
  • High accuracy and good stability

Disadvantages:

  • Single point measurement.
  • The pitot tube is fragile
  • DP signal is low.

Annubar flow meter calibration

The annubar flowmeter is a commonly used type of flowmeter. It is a new type of differential pressure flow detection component, developed based on the principle of pitot tube velocity measurement.

It has the advantages of stable performance, flexible use and high reliability.

1. Connect the signal cable and power cable;

2, open the import and export valves, the inlet and outlet valves must be consistent

3. Open the stainless steel three-valve balance valve, slowly open the high-low pressure end of the orifice plate, and close the stainless steel three-valve balance valve, after the fluid passes through the flowmeter.

Annubar flowmeter installation pipeline conditions:

(1) The straight pipe sections before and after the throttle piece must be straight, and must not be visible to the naked eye.

(2) The straight pipe section used for installing the throttle piece should be smooth. If it is not smooth, the flow coefficient should be multiplied by the roughness correction sparse.

(3) In order to ensure the flow of the fluid, a fully developed turbulent velocity distribution is formed in the 1D before the throttle. And the distribution is made into a uniform axisymmetric shape, so:

1). The straight pipe section must be round. And the roundness of the 2D range of the throttle is very strict and has a certain roundness index.

Specific measurement method:

(A) On the OD, D/2, D, 2D 4 vertical pipe sections of the throttle, measure the inner diameter of the four pipes, at least equal to each other with an equal angular distance, and take the average value D.

The difference between the measured value of internal diameter, and the average value shall not exceed ±0.3%.

(B) After the throttle element, 8 inner diameter single measured values ​​are measured, by the above method at the OD and 2D positions. And any single measured value is compared with D. And the large deviation of zui must not exceed ±2%.

2). Before and after the throttle element, a straight pipe section of sufficient length is required.

The length of the straight pipe section which is long enough. And the form of the local resistance part. Before the throttle element are related to the diameter ratio β.

(4) The length of the straight pipe section between the upstream side of the throttle member, the resistance member and the second resistance member may be 1/2 of the listed value. According to the form of the second resistance member, and β = 0.7 (regardless of the actual β value)

(5) When the upstream side of the throttle member is an open space, or a large container with a diameter ≥ 2D, the open space or the straight pipe length, between the large container and the throttle member shall not be less than 30D (15D).

If there are other local resistance members, between the throttle member and the open space or the large container. The open space is from the open space to the length of the small straight pipe section 1 provided, between the throttle member and the local resistance member.

The total length of the straight pipe section between the throttle pieces shall not be less than 30D (15D).

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Frequently
Asked
Questions

Annubar flow meter is sometimes referred to as Averaging pilots and contains multiple pressure tappings to ‘average’ the flow; this is to try to compensate for a non-ideal flow profile.
The averaging pitot tube is inserted across the pipe as shown below. One side of the bar has pressure taps facing the flowing fluid that are coupled into an “averaging” chamber that measures the total (i.e. static + dynamic) pressure of the fluid.

There are numerous types of flow meters depending upon the application, the specific fluid, and the construction, including materials, of the flow meter. The 5 basic classifications of flow meters include:
1. Differential Pressure Flow Meters
Differential pressure flow meters measure the differential pressure across an orifice where flow is directly related to the square root of the differential pressure produced. There are also primary and secondary elements in differential flow meters. The primary element produces a change in kinetic energy using either flow nozzle, pitot tube, orifice plate, or venturi flow meters. The secondary element measures the differential pressure and provides the signal.
Differential pressure meters represent around 1/5 of all flowmeters around the world. They are commonly used in the oil & gas industry, along with HVAC, beverage, water, pharma, mining, paper, and chemical applications.

Extended reading: What Is A Venturi Flow Meter?
2. Positive Displacement Flow Meters
Positive displacement (PD) flow meters measure the volume filled with fluid, deliver it ahead and fill it again, which calculates the amount of fluid transferred. It measures the actual flow of any fluid while all other types of flow meters measure some other parameter and convert the values into flowrate. In PD flow meters, the output is directly related to the volume passing through the flow meter. PD flowmeters include piston meters, oval-gear meters, nutating disk meters, rotary vane type meters, etc.
Positive displacement flow meters are known for their accuracy. They are commonly used in the transfer of oils and fluids, like gasoline, hydraulic fluids as well as in-home use for water and gas applications.
3. Velocity Flow Meters
Velocity meters measure the velocity of the stream to calculate the volumetric flow rate. These are less sensitive when the Reynolds number of fluid is higher than 10000. Velocity flow meters include turbine, paddlewheel, vortex shedding, electromagnetic, and sonic/ultrasonic flow meters.
4. Mass Flow Meters
Mass flow meters are more effective in mass-related processes as they measure the force that results from the acceleration of the mass. More specifically, the force is measured as the mass moving per unit of time, instead of the volume per unit of time. Mass flow meters include Coriolis mass meters and thermal dispersion meters.
Typical applications for mass flow meters are tied to chemical processes. In addition to the chemical and gas industries, typical industries using mass meters include pharma, power, mining, and wastewater.
5. Open Channel Flow Meters
Measurement of liquid in open channels includes v-notch, weirs, and flumes. These dam-like structures, or overflows, allow for a limited or concentrated free-flow of liquids based on the unique shape and size of the structure. This type of flow meter allows for a reading of the flow rate to be calculated.
Common applications of open channel meters include free-flowing liquids like streams, rivers, irrigation channels, and sewer/wastewater systems.

From Wikipedia:

The biggest difference between an annubar and a pitot tube is that an annubar takes multiple samples across a section of a pipe or duct. In this way, the annubar averages the differential pressures encountered accounting for variations in flow across the section. A pitot tube will give a similar reading if the tip is located at a point in the pipe cross section where the flowing velocity is close to the average velocity.

Sino-Inst offers over 10 Annubar Flow Meter products. These are differential pressure flow meters, 40% are water meters (like the Insertion Turbine Flow Meter), and 40% are water treatment (like the Annubar flow meter ).

A wide variety of Annubar Flow Meter options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Annubar Flow Meter, located in China. The top supplying country is China (Mainland), which supply 100% of the Annubar Flow Meter respectively.

Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. Annubar Flow Meter products are most popular in Domestic Market, Southeast Asia, and Mid East.

You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

Request a Quote

Handheld Ultrasonic Flow Meter

Handheld ultrasonic flow meter realizes the non-contact measurement of liquid flow. Also often referred to as Portable Clamp-On Ultrasonic Flow Meter for Liquids.

Handheld Ultrasonic Flow Meter ( Model:2000H) has been successfully applied to measurement work in various industries. The measuring range is 20-6000mm (0.5-20 inches). A non-contact measurement method is adopted. Flexible operation and easy to carry. Conductive or non-conductive, corrosive or non-corrosive liquids can be measured. Various fluids: water, pure water, sewage, sea water, chemical fluids, river water, fuel Oil etc. can be measured.

Handheld Ultrasonic Flow Meter Reference price: USD 470.00/pc

Sino-Inst offers a variety of  Ultrasonic flow meters for flow measurement. If you have any questions, please contact our sales engineers.

Features of Handheld Ultrasonic Flow Meter

  • High precision measurement
    • Measurement accuracy is better than ±1%, linearity is 0.5%, repeatability is 0.2%
  • Small size and light weight
    • Volume: 210 × 90 × 30mm, the host weight is only 0.5kg
  • Non-contact measurement 
    • The magnetic flow ultrasonic sensor is adsorbed on the outer wall of the pipe to complete the flow measurement.
  • Large measuring range
    • Measurement of pipe flow from DN20 to DN2000 with different types of sensors
  • Charger
    • Built-in large-capacity nickel-metal hydride rechargeable battery to support continuous operation of the flowmeter for more than 12 hoursLarge screen
  • LCD display
    • It can display cumulative flow, instantaneous flow, flow rate, working status, etc. at the same time.
  • Built-in data logger
    • Built-in data logger with a space of 24K bytes and can store 2000 lines of measurement data.

Specifications of Handheld Ultrasonic Flow Meter

Items Performance and Parameter
Main Unit Principle transit-time ultrasonic flowmeter
Accuracy Accuracy :over 1%-2%; 
Repeatability: over 0.2%
Display 4 line x 16 character LCD with backlight
Dimension 200*93*33cm:  
 390g
Operation Support 16 key light touch keyboard 
and the Simulation keyboard software
Data interface Insulate RS232 serial interface, 
upgrade the flew meter software by computer, 
support the MODBUS, etc. 
Signal Output 1 way OCT output
Special Cable Twisted-pair cable ;
Select the RS232 communication.;
Generally, the standard is 5m*2, 
optional 10m*2 
Pipe Condition Pipe Material Steel, Stainless steel, Cast iron, Copper, 
Cement pipe, PVC, Aluminum, 
Glass, steel product, liner is allowed.
Pipe Diameter DN 15—6000mm
Straight length pipe Transducer installation should be satisfied: 
upstream10D, downstream 5D, 
30D from the pump.
Measuring Medium Type of Liquid Water ; Ultra-pure liquids; 
Solvents and other liquids 
Temperature Standard Transducer: -30–90; 
High-temperature transducer: -40–160
Turbidity under 10000ppm and less bubble 
Flow rate 0–±10m/s
Flow Direction Measuring two (plus-minis)
direction of flow rate 
Working Environment Temperature Main Unit: -20–60
Flow transducer: -40–160
;  
Temperature transducer: according to the customer’s demands.
Humidity Main Unit: 85% RH
Power Supply AC  110V-240V  

Optional Transducer

Handheld Ultrasonic Flow Meter packaging 3.png

Guess You’ll Like: Ultrasonic flow meters types & technical guide

Featured Clamp-on ultrasonic flow meters

Handheld Ultrasonic Flow Meter is a commonly used clamp-on ultrasonic flow meter.

Clamp-on ultrasonic flow meter mainly refers to the installation form of the ultrasonic sensor. The sensor clamp is fixed outside the pipe.

Clamp-on ultrasonic flow meters can be handheld, wall-mounted, and portable with printing functions depending on the host. You can select different hosts according to your measurement needs.

Typical Applications of Handheld Ultrasonic Flow Meter

The handheld ultrasonic flow meter is mainly used for flow measurement of industrial pipeline fluids, and is widely used in environmental protection, petrochemical, metallurgy, paper-making, food, pharmaceutical and other industries.

The SI-2000H ultrasonic flow meter is ideal for flow testing during test and balance.

It is also useful for temporary flow monitoring, in existing systems to establish baseline demand data.

  • Water (hot water, cooling water, potable water, seawater, etc.)
  • Petroleum products
  • Chemicals, including alcohol, acids, etc
  • Beverage, food, and pharmaceutical processors
  • Secondary sewage, waste treatment, etc.
  • Power plants, Metallurgy, and miming applications
  • Pipeline leak detection, inspection, tracking, and collection

Of course, if you are allowed to install a pipe segment flowmeter in your measurement pipeline, you may consider the use of an electromagnetic flowmeter. Electromagnetic flowmeters will provide more accurate measurements.

For example, if you need to measure the wastewater flow of a 2-inch pipe, then you can refer to: Magnetic Flow Meters Guides.

Handheld Ultrasonic Flow Meter Installation

Handheld Clamp on Transducers

  • Install the clamp on transducer (with magnet) on the pipe, can finish the flow measurement. No pressure drop, no need cut off pipe.
  • Several types transducers for selection, measuring pipe size from DN25-DN6000mm.
  • Several types transducers for selection.

Clamp on Mounting Bracket Transducers

  • Bracket transdcuer can simplify the ultrasonic flow meter installation process. Shorten installation time and improve installation accuracy.
  • Install the clamp on bracket transducer (with magnet) on the pipe. Can finish the flow measurement. No pressure drop, no need cut off pipe.
  • Several types bracket transducers for selection, measuring pipe sizing from DN25-DN700mm.
  • Several types bracket transducers for selection, measuring temperature range -30℃ to 160℃.

Check more Choosing The Right 1 Inch Flow Meter.

Portable ultrasonic flow meter for water

Ultrasonic flowmeter is especially suitable for measuring large-diameter liquid pipelines because of its measuring principle. It has a large number of applications in urban water supply and sewage treatment industries. And the measurement results are very good.

Water is often used as circulating water in industrial production. That is, the water that can be recycled as the carrier of heat in the production process of the enterprise. The beginning is a circulating pool with a cooling system, and the end is the heat exchange equipment of the production workshop.

There are many types and quantities of heat exchange equipment in biochemical companies, so the circulating water pipelines are complicated. If a flow meter is installed on each circulating water pipeline, it will be a considerable expense.

Therefore, most production companies do not install flow meters for circulating water pipes in the initial stage of design to reduce investment costs. However, in order to grasp the operating efficiency of all heat exchange equipment in the production process, it is necessary to detect the flow rate of the circulation in the pipeline. .

An ultrasonic flowmeter can be used as a standard meter to transmit the value. It not only protects water resources rationally and scientifically, but also quantifies the paid use of water resources to a great extent. At the same time, it also protects the interests of both parties who use the water and reduces the cost of enterprise inspection. This makes periodic verification of large-caliber water flow meters a reality.

Handheld ultrasonic flow meter manual:

The measurement accuracy of the ultrasonic flowmeter is very high. Almost no interference from various parameters of the measured medium. In particular, it can solve the flow measurement problems of strong corrosive, non-conductive, radioactive and flammable and explosive media that other instruments cannot.
So what causes the inaccurate measurement of the ultrasonic flowmeter? The following are the reasons for the inaccurate measurement:
The influence of pipeline parameter equipment on the accuracy of ultrasonic flowmeter measurement.
The influence of upstream and downstream straight pipes on the accuracy of ultrasonic flowmeter measurement.
The influence of couplant on measurement accuracy.
The influence of the installation position of the ultrasonic flowmeter transducer on the measurement accuracy.

Read More about: Choose the most suitable Inline flow meter

Common types of ultrasonic flow meters
①According to the measurement principle. Ultrasonic flowmeters are now the most commonly used methods for measuring flow rates are the propagation velocity difference method ultrasonic flowmeter and the Doppler frequency shift method ultrasonic flowmeter. The propagation velocity difference method can be divided into three types: time difference method, phase difference method and acoustic cycle frequency difference.
②According to the installation method of the transducer. There are two types of ultrasonic flowmeters: fixed ultrasonic flowmeter and portable ultrasonic flowmeter.
The transducer installation methods of the fixed ultrasonic flowmeter can be divided into:
A tube-segment ultrasonic flowmeter integrating transducer and measuring tube;
The external clamp ultrasonic flowmeter with the transducer clamped on the outer wall of the measuring tube;
Plug-in ultrasonic flowmeter in which the transducer passes through the outer wall of the pipe and directly contacts the medium;
The transducer is attached to the inner wall of the large pipeline ultrasonic flowmeter.
③According to the channel of propagation. Ultrasonic flow meters can be divided into single-channel ultrasonic flow meters and multi-channel ultrasonic flow meters. Among them, multi-channel can be divided into two-channel ultrasonic flowmeter, ultrasonic flowmeter, four-channel and eight-channel ultrasonic flowmeter.
Extended Reading: Inline Ultrasonic Flow Meter

Ultrasonic flowmeters use sound waves to determine the velocity of a fluid flowing in a pipe.
At no flow conditions, the frequencies of an ultrasonic wave transmitted into a pipe, and its reflections from the fluid are the same.
Under flowing conditions, the frequency of the reflected wave is different, due to the Doppler effect.
When the fluid moves faster, the frequency shift increases linearly.
The transmitter processes signals from the transmitted wave, and its reflections to determine the flow rate.
Extended reading: Ultrasonic flow detectors types

More Featured Liquid Flow Meters

Frequently
Asked
Questions

Portable Ultrasonic Flow Meter is a handheld ultrasonic flow meter. The clamp-on sensor is used to measure liquid flow in industrial pipelines.

The portable ultrasonic flowmeter uses a non-invasive sensor to measure liquid flow. The installation process is extremely simple. There is no need to destroy the pipeline during the measurement process and no need to stop production. The sensor is not in contact with the measured medium. Battery powered, small size, light weight and easy to carry. Realize the real sense of mobile flow measurement, online detection, is a real sense of portable ultrasonic flowmeter.

Generally speaking, mass flow meters are relatively accurate.
Of course, the accuracy of the flowmeter still depends on the site conditions.
If the measurement of temperature and pressure is not very difficult, the accuracy of the flowmeter must be relatively high.
In addition, to ensure the accuracy of the flowmeter, correct installation and use are also very important.

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Sino-Inst, Manufacuturer for Handheld Ultrasonic Flow Meters. It can measure a single sound-conducting liquid medium of DN 15—6000mm. It can measure even liquids such as water, sea water, oil, and slurry.

Sino-Inst’s Handheld Ultrasonic Flow Meters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.

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