Monthly Archives: October 2020

Mass Flow Rate vs Volumetric Flow Rate

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Mass flow rate and Volumetric flow rate is what we must use in flow measurement and control. So what is mass flow and what is volumetric flow? How to switch between them? In this post, we compare the concept of volume flow and mass flow and the conversion between the two.

Mass Flow Rate vs Volumetric Flow Rate

Commonly used flow meters, such as orifice plates. Turbine flowmeter. Vortex flowmeter. Electromagnetic Flowmeter. Rotameter. The flow measurement value of ultrasonic flowmeter and oval gear flowmeter is the volume flow of fluid. Coriolis mass flow meters and thermal gas mass flow meters measure mass flow.

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

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What is Flow Rate?

Flow rate refers to the ratio of the amount of fluid flowing through the cross-section of the pipe to the time it takes for that amount to pass through the cross-section. Flow is divided into volume flow and mass flow.

What is volume flow Rate?

The volume flow rate is the flow rate expressed by the volume of the fluid quantity.
The volume flow is expressed by the formula: qv=V/t=u×A.

In the formula:

  • qv is the volume flow, m3/s.
  • V is the unit flow volume, m3.
  • t is the unit time, s.
  • u is the average flow velocity in the pipe, m/s.
  • A is the cross-sectional area of ​​the pipeline, m2.

Among the commonly used flow meters, such as orifice plates, turbine flow meters, vortex flow meters, electromagnetic flowmeters, rotameters, ultrasonic flow meters, and oval gear flow meters, the flow measurement value is the volume flow of the fluid.

If you need, you can learn more about Flow Rate And Pressure Relationship.

Featured Volume Flow Meters

Volume flow unit converter

UnitL/minm3/hf t 3/hUkgal/minUsgal/minUS  bbl/d
L/min10.062.11890.219970.02641889.057
M3/h16.667135.3143.6674.403151
Ft3/h0.47190.02831710.10380.12474.2746
Ukgal/min4.5640.027279.632511.2003241.1
Usgal/min3.7850.22738.02080.8326134.28
US
bbl/d		0.11040.006240.233940.024280.029171

What is mass flow Rate?

Mass flow rate refers to the flow rate of fluid quantity expressed by mass.
The mass flow rate can be expressed by the formula: qm=m/t=ρ×u×A.

In the formula,:

  • qm is the mass flow rate, kg/s.
  • m is the unit fluid mass, kg.
  • ρ is the fluid density, kg/m3.
  • t is the unit time, s.
  • u is the average flow velocity in the pipe, m/s.
  • A is the cross-sectional area of ​​the pipeline, m2.

Extended reading: Gas mass flow controller working principle

Featured Mass Flow Meters

mass flow rate units converter

1 kilogram per second (kg/s)

=3600.0000 kilograms per hour (kg/h)

=3.6000 tons per hour (t/h)

=86.4000 tons per day (t/d)

=2.8800×104 tons per year (t/a)

= 2.2046 pounds per second (lb/s)

= 7936.6414 pounds per hour (lb/h)

= 1.9048 x 105 pounds per day (lb/d)

Unit(t/h)(kg/h)(kg/min)(kg/s)(UKton/h)(lb/h)(lb/min)(lb/s)
(t/h)110316.66670.2777780.9842072204.6236.74370.61239
(kg/h)10-310.01666672.77778×10-49.84207×10-42.204620.03674376.12395×10-4
(kg/min)0.066010.01666670.0590524132.2772.204620.0367437
(kg/s)3.636006013.543157936.63132.2772.20462
(UKton/h)1.016051016.0516.93420.2822361224037.33330.62222
(lb/h)4.53592×10-40.4535920.007559871.25998×10-44.46429×10-410.01666672.77778×10-4
(lb/min)0.027215527.21550.4535920.007559870.02678576010.016666
(lb/s)1.632931632.9327.21550.4535921.607143600601

Volumetric flow rate to Mass flow rate

The mass flow rate and volume flow rate relationship can be briefly summarized as follows:

  1. If the mass flow of the flow is known and needs to be converted into volume flow, the following formula can be used: qv=qm/ρ. In the formula, qv is volume flow, m3/s. qm is mass flow, kg/s. ρ is fluid Density, kg/m3.
  2. If the volume flow rate of the fluid is known, it needs to be converted into a mass flow rate, which can be done with the formula: qm=qv×ρ.

volumetric flow rate to mass 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

How to convert air volume flow to air mass flow?

The conversion factor between air volume flow rate and air volume flow rate is 1.29. That is, to convert the volume flow of air into the mass flow, multiply the coefficient by 1.29.

Solution: Let the mass of air passing in t hours be m kg, the volume be V cubic meters, and the known air density ρ = 1.29 kg/m3.

Then the volume flow rate of the air qv=V/t (cubic meters/hour), and the mass flow rate qm=m/t (kg/hour).

And because air quality = air density x air volume, m = ρV = 1.29V.

Then qm=m/t=ρV/t=ρqv=1.29qv.

That is, to convert the volume flow of air into a mass flow, multiply the coefficient by 1.29.

Converter Tool: Volumetric Flow Rate & Pipe Diameter to Flow Speed Calculator

Density, Mass Flow, and Volumetric Flow Relationship

A description of the relationship between density, mass flow rate, and volumetric flow rate. The following video provides a good explanation.

Video source: https://www.youtube.com/watch?v=4KNfADc77XU

Frequently
Asked
Questions

Help Center

If the volume flow rate of the fluid is known, it needs to be converted into mass flow rate, which can be carried out by the formula: qm=qv×ρ

Volume flowrate (Volume Flowrate) is the volume of fluid passing through the flow section per unit time, referred to as flow rate, expressed by Q.
Flow rate expressed in volume/time or volume/time. Such as: m³/h ,l/h.
Volume flow rate (Q) = average velocity (v) * pipe cross-sectional area (A)

The fluid pressure and flow rate in the pipeline are completely two concepts. For fluids with high pressure, the flow rate can be high or low.
Engineering pressure is the amount of force per unit area. The flow rate is the amount (weight or volume) of the fluid flowing through the pipe per unit time.
Here, there is another important parameter: flow rate. It is the average velocity of fluid flowing in the pipe. The unit is: the flow rate per unit area (internal section of the pipeline). That is: the flow rate multiplied by the pipe cross-sectional area equals the flow rate.
If the fluid is a gas (compressibility), the flow rate is constant, and the flow rate of a gas with high pressure is of course also large. If the size of the pipe is constant, the flow rate of the fluid with a large flow rate is of course also large; the pressure loss (i.e. pipeline resistance) is proportional to the square of the flow rate, that is, proportional to the square of the flow rate.

Read more : How to Calculate Pressure Drop in a Pipe?

If the fluid under a certain pressure is directly discharged to the atmosphere under certain conditions (the diameter of the pipe is the same), the fluid pressure can be converted into velocity energy, and the flow rate of the fluid with high pressure is correspondingly high, and of course, the flow rate is also large.

More mass or volume flow measurement solutions

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Grease Flow Meters

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Sino-Inst is Manufacturer of Mass Flow Meters and Volumetric Flow Meters. We supply more than 50 kinds of Flow Meters. 40% mass flowmeters, and other types of Volumetric flowmeters.

Since the mass flowmeter has the ability to directly measure the mass flow of fluid beads, the measurement accuracy is high. It has a wide range of applications, low installation requirements, reliable operation of the instrument, and low maintenance rate. Mass flow meters have been widely used in flow measurement in petroleum, chemical, metallurgy, thermal, electric power, food and other fields.

Volumetric flowmeters are low cost and cover more measurement applications. It is also widely used in various industrial production control processes.

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

The entire team at Sino-Inst’s has received excellent training, so we can ensure that every client’s needs are met. For assistance with your product requirements, whether it’s a flow sensor, level sensor, or other device, give us a call.

Application Tutorial: Magnetostrictive Level Gauge

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Magnetostrictive level gauge application tutorial. Just one article to help you understand !

This article introduces the installation method and typical application of magnetostrictive level gauge in depth. Help you fully understand the structure and selection of magnetostrictive level gauges.

Sino-Inst offers a variety of  Magnetostrictive level gauges for level measurement. If you have any questions, please contact our sales engineers.

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Magnetostrictive level gauge measurement principle

Substances expand and contract with heat. In addition to heating, magnetic and electric fields can also cause the size of objects to elongate or shrink. Under the action of an external magnetic field, the size of a ferromagnetic substance elongates (or shortens). After the external magnetic field is removed, it returns to its original length. This phenomenon is called magnetostriction (or effect).

Based on the principle of magnetostriction, a magnetostrictive wire is installed in the non-magnetic probe, and the sensor is connected to one end of the magnetostrictive wire. The main control electronic unit sends a narrow electromagnetic pulse to the magnetostrictive line, and the electromagnetic pulse is conducted along the magnetostrictive line.

When the magnetic field generated by the pulse interacts with the magnetic field generated by the magnet in the float marking the liquid level/interface, a torsional stress wave will be generated on the magnetostrictive line, which will return to the sensor along the magnetostrictive line. Convert the captured return wave into an electronic pulse signal and send it back to the main control electronic unit.

The main control electronic unit accurately measures the time interval between the emission pulse and the return pulse through a precision circuit, and calculates the position of the float, that is, the height of the liquid level/interface.

Magnetostrictive level gauge application range

◆Power plant: reservoir, waste gas purification tank, fuel tank, etc.
◆Oil field: crude oil or product oil storage tank, three-phase separator, settling tank, sewage tank (pool), etc.
◆Petrochemical: oil pipelines, distillation towers, concentration tanks, liquefied gas tanks, ammonia tanks, oil refineries, etc.
◆Chemical industry: distillation tower, ammonia tank, toxic liquid tank, etc.
◆Water and water treatment: reservoirs, sewage tanks, water treatment tanks, sedimentation tanks, digestion towers, etc.
◆Others: food, pharmaceutical, environmental protection, papermaking and other industries

Read more about: Common Types Of Heating Oil Tank Level Sensors

Features of magnetostrictive level gauge

◆Multi-function: can measure liquid level and interface position separately or at the same time
◆High precision: measurement accuracy ±0.8mm or 0.01%FS (the larger one)
◆Wide scope of application: flexible and diversified installation methods.
◆Output mode: on-site instructions and remote electrical signal output
◆Low power consumption: two-wire loop 4-20mA output, LCD display

The principle and characteristics of the magnetostrictive level gauge are briefly introduced above.

The following content of this article will give a detailed introduction to the application of magnetostrictive level gauges. I hope you have a deep understanding of the installation and use of magnetostrictive level gauges on site after reading this article.

1.Probe form of magnetostrictive level gauge

Magnetostrictive level gauges usually have rod probes and cable probes. With different floats, the liquid level or interface can be measured.

①The probe is a rod type probe, which can measure liquid level or interface with different floats. The maximum length is 4m.

②The probe is a rod probe, which can be equipped with double floats to measure the liquid level and interface at the same time. The maximum length is 4m.

③The probe is a cable probe, which can measure liquid level or interface with different floats. The maximum length is 20m.

2.Installation method and structure of magnetostrictive level gauge

The magnetostrictive level gauge can be combined with the outer pontoon or the outer pontoon + magnetic flap into several installation methods. It is not only easy to install and maintain, but also can cooperate with the on-site flip display. Realize the on-site and remote dual output. The probe has multiple parameters to choose from. Including: installation type, connection method, probe installation type, end structure, etc.

①Installation of probe rod and magnetic flap

◆For the probe structure that is attached outside the probe. The probe rod is usually fixed on the opposite side of the connecting structure, as shown in the figure below.

◆When a magnetic flap is needed, the magnetic flap is usually fixed on the opposite side of the connection structure. At this time, the probe rod will move to any position on the left and right sides of the float, as shown in the figure below.

② Magnetostrictive level gauge probe top insertion + side/side installation method

The picture above shows the most commonly used side mounting: side-to-side mounting (the probe mounting type is for inserting the top of the probe)

Figure a. Connection mode: flange connection, bottom structure: end cover + plug
Figure b. Connection method: chuck connection, bottom structure: blind flange
Figure c. Connection method: welding, bottom structure: short pipe + drain valve
Note: There is no necessary correspondence between the connection mode and the end structure.

③The bottom of the magnetostrictive level gauge probe is inserted + side/side installation method

The probe installation types in the above figure are all “insert installation at the bottom of the probe”.

Figure d. Top structure: end cover + plug
Figure e. Top structure: blind flange
Figure f. Top structure: closed
This structure is not conducive to sewage and maintenance. Therefore, when using the probe upside down, it is recommended to install the probe upside down and externally bound.

④Figure g shows the magnetostrictive level gauge probe top insertion + top/side installation
⑤Figure h shows the bottom insertion + side/bottom installation of the magnetostrictive level gauge probe
⑥Figure i shows the magnetostrictive level gauge probe top insertion + top-mounted installation + magnetic flap display
⑦Picture j is the magnetostrictive level gauge probe top insertion + side/side installation + magnetic flap display
Note: The two installation methods of ⑥ and ⑦ are suitable for occasions where the measurement position is low.

⑧Figure k Magnetostrictive level gauge probe upside-down external binding + bottom-mounted plug-in installation + magnetic flap display
⑨Figure l Magnetostrictive level gauge probe upside-down external binding + side/side installation + magnetic flap display

Note: ⑧ and ⑨ installation methods The probe installation type is the probe inverted and externally bound. These two installation methods are suitable for occasions with higher measuring positions. The end cover + plug structure or blind flange structure is selected for the bottom, which is conducive to sewage and maintenance.

The above pictures are all attached to the outside of the probe.
⑩Figure m shows the probe front-mounted external binding installation
⑪Figure n shows the probe front-mounted external binding installation
⑫Figure o shows the probe upside-down and external binding installation
The manufacturer will choose the formal installation type according to the top structure

The picture above is a schematic diagram showing the magnetostrictive level gauge with a magnetic flap.
⑬Picture p is side-mounted, side-to-side mounted, with the probe top inserted
⑭Figure q shows two views of side-mounted, side-to-side installation, the probe top is inserted and installed, and the bottom end cover + plug structure
⑮Figure r is a schematic diagram of the side-mounted, side-to-side mounted, the probe is mounted with an external binding type, the top is closed, and the bottom drain valve structure is schematic.

Typical tank application of magnetostrictive level gauge

1.Magnetostrictive liquid level gauge is used for liquid level measurement of agitated and foamed containers

When applied to occasions with stirring and foam, liquid level fluctuations and foam will affect the measurement. At this time, it is recommended to use a top-mounted probe or add a protective tube to the probe.

2.Magnetostrictive level gauge is used for liquid level measurement of small-sized containers

◆When the container to be measured is small, the use of side-to-side connection will reduce the effective measurement range. At this time, the side-to-bottom or top-to-side connection can be used to effectively increase the measurement range.

◆When the process temperature is high, you should pay attention to heat preservation, as shown in the figure on the right, you can use insulation cotton for heat preservation, or use electric heat tracing and steam heat tracing for heat preservation.

3.Magnetostrictive liquid level gauge is used for liquid level measurement of buried tank

The “buried tank” here includes a container whose main body is buried in the ground and a container whose sides are covered and cannot be installed with meters. For the measurement of this type of container, simple applications can use rod probes and cable probes. If you need on-site display, you need to use a magnetic flap + top-mounted plug-in installation type

4.Magnetostrictive liquid level gauge is used for liquid level measurement of ceiling tanks and suspended tanks

When the location of the container to be measured is high, it is difficult to install, debug, and maintain the instrument, and it is difficult to display on-site. It is recommended to use magnetic flap + bottom-mounted plug-in installation type. Or magnetic flap + bottom-mounted side-side mounting type.

Magnetostrictive level gauge installation methods and professional knowledge of typical applications are shared here.

I don’t know if you have noticed: whether there is a sudden sense of clarity when selecting the magnetostrictive level gauge based on the on-site working conditions and these installation and application examples. The selection is simply to convert the legend to the response model!

Magnetostrictive Level Gauge/Sensors for Sale

LD series Rigid Probe Magnetostrictive Level Transmitter
LR series Integral flange Magnetostrictive level sensor
LT series Digital Display Magnetostrictive liquid level sensor
LP series Magnetostrictive Tank Level Indicator-PVDF/ PPH/ PTFE/ PFA/ PP
MH series Magnetostrictive Cylinder Position Sensor

Sino-Inst offers over 10 Magnetostrictive level gauges for level measurement. About 50% of these are Magnetostrictive liquid level meters, 40% is the tank level sensor.

A wide variety of Magnetostrictive level gauges options are available to you, such as free samples, paid samples.

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

Intrinsically Safe vs Explosion Proof Pressure Transmitters

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Intrinsically safe vs explosion proof is a common function of pressure transmitters. When pressure transmitters need to be used in high-risk and explosive places, you must know it!

The explosion-proof pressure transmitter is divided into: intrinsically safe pressure transmitter (explosion-proof mark Exia ⅡC T6 Ga), explosion-proof pressure transmitter (explosion-proof mark Exd ⅡC T6 Gb). Intrinsically safe pressure transmitters must be used with safety barriers. The connection terminals of explosion-proof pressure transmitters must have an explosion-proof electrical connector box and a solid shell.

Sino-Inst offers a variety of  explosion-proof pressure transmitters. If you have any questions, please contact our sales engineers.

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Intrinsically Safe vs Explosion Proof

It is often necessary to use explosion-proof instruments in industrial sites. The general industrial explosion-proof instruments are mainly explosion-proof and intrinsically safe. So, how to understand the difference between them?

Different from the design concept:

Flameproof definition:

It can withstand the explosive pressure of internal explosive gas mixture. And can prevent the internal explosion from spreading to the explosive mixture around the enclosure of electrical equipment enclosure (zone I explosion-proof technology).

Dangerous gases are allowed to enter the flameproof enclosure, which may cause an explosion. However, the enclosure must have sufficient strength. And each shell joint surface must have a sufficiently long engagement length and a sufficiently small gap. To ensure that the internal explosion will not pass through the flameproof joint and cause the external environment to explode.

Clearance explosion-proof technology. Rely on the gap and mesh length to achieve the effect of cooling and flameout.

Definition of intrinsic safety:

Any electric spark or any thermal effect generated under the conditions specified in the standard (including normal operation and specified fault conditions) cannot ignite the circuits in the specified explosive gas environment (Zone 0/I explosion-proof technology).

It is a “safe” technology that uses suppression of ignition source energy as an explosion-proof method. It is required that the electric spark or thermal effect that the equipment may produce under normal operation or failure state are respectively less than the minimum ignition energy and self-ignition temperature of the explosive dangerous gas. For example: hydrogen 19uJ 560℃.

Intrinsically safe technology is actually a low-power design technology. Therefore, it can be well applied to industrial automation instruments.

Read more about: What Is the Difference Between Class 1 Div 1 and Class 1 Div 2 ?

Different from the application area

Explosion-proof applicable area: It can only be installed in hazardous locations in Zone 1 or Zone 2.

Intrinsically safe application area:

Exia: Equipment that can maintain explosion-proof performance until two components or other types of failures. Intrinsically safe equipment can be installed in hazardous locations in Zone 0, Zone 1, and Zone 2. Exia intrinsically safe equipment is the only explosion-proof electrical equipment that can be installed in zone 0.

Exib: Equipment that can maintain explosion-proof performance until a component or other type of failure. Intrinsically safe equipment can be installed in hazardous locations in Zone 1 and Zone 2.

Explosion Proof Pressure Transmitter

SIEP489 Explosion proof pressure Transmitter is a microprocessor-based high-performance transmitter. SIEP489 has flexible pressure calibration, push button configuration, and programmable using HART® Communication. We also supply industrial pressure sensors, and explosion proof differential pressure transmitter.

All our electronic pressure transducers can be offered with Explosion-proof. Select explosion-proof pressure transmitters with Ex d certification and 4-20mA output signals for installation. These installations require the use of equipment and enclosures designated as containing internal explosives. This prevents ignition of the explosive environment surrounding the equipment ( Specified) Flameproof area.

The application range of explosion-proof pressure transmitter is as follows:

  1. Natural gas control system natural gas compressor dispenser;
  2. Oil well platform wellhead pressure equipment blowout preventer pipeline equipment mine;
  3. Storage and transportation monitoring of oil tanks and oil products, petrochemical equipment, oil refining;
  4. Oxygen transmission system and pipeline, hydrogen equipment;
  5. Power stations, boilers, thermal power units, etc.;
  6. Petrochemical environmental protection air compressor light industry machinery metallurgy;
  7. Other pressure measurement environments with explosion-proof requirements.

Of course, intrinsic safety and explosion-proof are not limited to pressure transmitters. Other industrial instruments have this function. To ensure the use of users in dangerous and harsh environments.

More Featured intrinsic safety and explosion-proof sensors

Hygienic / Sanitary Pressure Transmitter
Also called Hygienic pressure Transmitters, or tri clamp pressure transmitter. Sanitary pressure Transmitters is used to food &beverage or pharmaceutical application.
High-Temperature Pressure Transmitter
High-temperature pressure transmitters with a 4-20mA output.
which has a temperature capability of over 850 °C and is not pyroelectric.
Absolute Pressure Transmitter
Absolute pressure transmitter with 4-20mA output for measuring pressure with absolute type reference. Absolute pressure (AP) transmitter is a measure of the ideal (complete) vacuum pressure.
Hydrostatic pressure transmitter
Hydrostatic pressure transmitter is used for fluid hydrostatic pressure measurement. With working static pressure up to 32Mpa, for liquid, gas or steam .
LD series Rigid Probe Magnetostrictive Level Transmitter
LR series Integral flange Magnetostrictive level sensor
LT series Digital Display Magnetostrictive liquid level sensor
LP series Magnetostrictive Tank Level Indicator-PVDF/ PPH/ PTFE/ PFA/ PP

Sino-Inst offers a variety of Intrinsically Safe vs Explosion Proof Pressure Transmitters for industrial pressure measurement. If you have any questions, please contact our sales engineers.

How to Calibrate a Pressure Transmitter

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What is Calibrate a Pressure Transmitter?

Calibrate a Pressure Transmitter is an important step to help pressure transmitters make accurate measurements. Only when the input and output are debugged together can it be called a true calibration. Including the pressure of the input transmitter, A/D conversion circuit, and loop current output circuit.

Pressure transmitter calibration is what you need to do before you install the pressure transmitters.

Technical Support Pressure Sensors

Pressure Sensor Calibration Case Share. The customer purchased a batch of high-frequency dynamic pressure sensors from our company. According to customer requirements, the accuracy of our pressure sensor is ±0.25% FS.

After the pressure sensor was produced, it was delivered to a third-party inspection company. The accuracy of the high-frequency dynamic pressure sensor was verified. As a result of the verification, the accuracy of our high-frequency dynamic pressure sensors has reached ±0.20% FS, and a calibration certificate is attached.

About High-Frequency Dynamic Pressure Sensor

The customer purchased our SI-90 high-frequency dynamic pressure sensor.

SI-90 High-Frequency Dynamic Pressure Sensor

The use of micro-machining technology makes the effective size of integrated silicon chips small, high natural frequency, and excellent elastic properties. Comprehensive performance is better than piezoelectric dynamic pressure sensors. It is the first choice for dynamic pressure measurement.

Measuring range

-100KPa~0~1KPa…20KPa…100MPa

Overload capacity

2 times full scale pressure (where the overpressure of 100MPa product is 1.1 times full scale pressure)

Type of pressure

Gauge pressure or absolute pressure

Measuring medium

Gas or liquid compatible with 316 stainless steel

Comprehensive accuracy

±0.1 %FS

±0.25%FS

±0.4%FS

Natural frequency

150KHz~700KHz

500KHz~1MHz

1MHz~2MHz

Transmitter bandwidth

0~1KHz~3KHz

0~20KHz

0~200KHz

Rise Time

0~0.2mS~75μS

0~12μS

0~1μS

Long-term stability

Typical: ±0.1%FS/year

Maximum: ±0.2%FS/year

Operating temperature

Generally -40℃~85℃

Special can be -10℃~250℃

Zero temperature drift

Typical: ±0.02%FS/℃

Maximum: ±0.05%FS/℃

Sensitivity temperature drift

Typical: ±0.02%FS/℃

Maximum: ±0.05%FS/℃

Power supply range

12~36VDC (generally 24VDC)

±15VDC standard switching power supply

Signal output

4~20mA / 1~5 V DC / 0~5V DC

Load Resistance

≤(U-10)/0.02Ω

Shell protection

The cable is IP67 and the connector connection is IP65

Vibration error

≤±0.01%FS (X, Y, Z axis, 200Hz/g)

Interface and shell

Stainless steel 1Cr18Ni9Ti

O-ring

fluororubber

Sensor diaphragm

Stainless steel 316L

Guess You’ll Like: Explosion Proof Pressure Transmitter

Pressure Transmitter Calibration Equipment

According to the description in “JJG882-2004 Pressure Transmitter Verification Regulations”. A pressure transmitter is an instrument that converts a pressure variable into a standardized output signal that can be transmitted. And there is a given value between its output signal and the pressure variable Continuous function relationship (usually linear function). Mainly used for the measurement and control of industrial engineering pressure parameters. Differential pressure transmitters are often used for flow measurement.

There are two types of pressure transmitters: electric and pneumatic. The standardized output signals of electric motors are mainly 0mA~10mA and 4mA~20mA (or 1V~5V) DC signals.

illustrate:

The two-wire pressure transmitter is a kind of electric type. Calibration should be carried out according to “JJG882-2004 Pressure Transmitter Verification Regulations”. The required equipment is as follows:

  1. One DC 24V power supply;
  2. One mA ammeter;
  3. One voltmeter;
  4. One standard pressure gauge;
  5. One pressure source;
  6. One piston pressure gauge (4 and 5 are optional when this option is available).

At present, the digital pressure calibrator integrates various functions such as DC24V, voltage measurement, current measurement, on-off measurement, etc. The equipment is constantly developing towards intelligence and miniaturization.

For example, you only need to configure the ConST273 intelligent digital pressure calibrator and the ConST100 series pressure pump. You can complete the HART intelligent pressure transmitter, ordinary pressure transmitter, precision pressure gauge, general pressure gauge, pressure controller, and other pressure instruments. Verification work.

Read more about: What Are 0-10V Pressure Transducers?

Pressure Sensor Calibration Certificate

Extended reading: Static pressure vs dynamic pressure vs total pressure

About the Third-Party Testing Company

The qualifications of the testing company are as follows:

More Featured Pressure sensors:

SI-303 Low-Pressure Transducer
Low pressure transducers for air and non-corrosive gases low pressure measurement. 0 ～ 2.5kPa to 0 ～ 30kPa measurable.
SI-350 Sanitary Pressure Transmitter
Sanitary Pressure Transmitter, also called tri clamp pressure transmitter,
is the pressure transducer with the flush diaphragm (flat membrane) as the pressure sensor.
SI-300 Pressure Transducer 4-20mA/Voltage
The 4-20mA/ Voltage Pressure Transducer,
also called pressure transmitter 4-20mA,
is a pressure sensor with4-20ma/Voltage output.
SI-390 Industrial Pressure Transmitter
Pressure transmitters for general industrial applicaitons. -0.1kPa ~ 0 ~ 0.01kPa ~ 100MPa ~150MPa. 0.1% FS, 0.25% FS, 0.5% FS. 4-20mA (2-wire system), 0-5 / 1-5 / 0-10V (3-wire system)
SI-520 Digital Pressure Sensor
Digital Pressure Sensor is particularly suitable for use in computer control systems. RS485 half-duplex working mode.
SI-302 OEM pressure sensor
OEM pressure sensors from Chinese manufacturer. Silicone filled. Protected by stainless steel diaphragm. Suitable for a variety of fluid media.
SI-703 Flush diaphragm pressure sensor
Flush membrane / diaphragm structure, anti-blocking design. Pressure measurement of viscous media.
SI-10 Liquid pressure sensor
Liquid pressure sensor is widely used for pressure measurement of various liquids. Like water or oils. IP68 waterproof.

How Do You Calibrate a Smart Pressure Transmitter?

Pressure Transmitter Calibration

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Steam Pressure Transmitter

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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 pressure…

Sino-Inst offers over 20 Pressure sensors. A wide variety of  Pressure sensors options are available to you. Such as free samples, paid samples. Sino-Inst is a globally recognized manufacturer of Pressure sensors, located in China.

Of course, according to your requirements, we can also provide Pressure Sensor Calibration Case: Third-party Calibration Certificate.

Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide. Pressure sensors products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.

Steam Flow Measurement: Do you need temperature and pressure compensation?

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Steam flow measurement has always been a problem. Today we solve a problem of temperature and pressure compensation. So Do you need temperature and pressure compensation for Steam Flow Measurement?

There are two types of steam, saturated steam and superheated steam.
The temperature and pressure compensation is superheated steam. For the real saturated steam, only temperature or pressure compensation is required. Check the density table according to the temperature and pressure during measurement to obtain the required mass flow.

Generally speaking, vortex flowmeter manufacturers will provide saturated and superheated steam mass flow range tables for users to select.

In the actual measurement, due to changes in working conditions, saturated steam and superheated steam are willing to deviate from the original design. It will change the relationship between steam temperature and pressure to obtain its density. Affect the accuracy of measurement.

Wet saturated steam

When the vortex flowmeter is installed behind the pressure reducing valve. The wet saturated steam suddenly decompresses greatly. The fluid undergoes adiabatic expansion. The water droplets partially evaporate. At the same time, the heat of vaporization is absorbed from the liquid and vapor phases. Reduce the vapor and liquid phase temperature.

If the temperature does not drop much or the humidity is high before evaporation, the temperature will quickly drop to the saturation temperature corresponding to the new pressure. Create a new balance. At this time, the steam is still saturated steam.

If the pressure drops a lot or the humidity is low before evaporation. After the temperature is lowered due to the evaporation of water droplets, it is still higher than the saturation temperature corresponding to the new pressure. The steam becomes superheated steam.

Superheated steam

In the flow calculator, the mass flow can be calculated according to the density of the superheated steam temperature and pressure. But when the superheated steam is transported over a long distance. Or due to improper pipe insulation measures. Often due to the decrease in heat loss temperature, it will enter the critical saturation state from the overheating state. Even part of the steam condenses and undergoes a phase change to become water droplets. At this time, it becomes wet saturated steam (supersaturated steam).

Read more about: Condensate Flow Meter-Steam Condensate Flow Meter|Types & Selection Guide

Featured Flow Meters for Steam Flow Measurement

Vortex Steam Flow Meter
V-Cone Flow Meter
Wedge Flow Meter
Welding Orifice Plate High temperature flow meter
Integral DP Flow Meter
Differential Pressure Flow Meters
B-F Flare Gas Ultrasonic Flow Meter
Precession Vortex Gas Flowmeter

Vortex flow meter for Steam Flow Measurement

The output of the vortex flowmeter is only proportional to the flow rate of the fluid flowing through the measuring tube. When measuring the humidity of saturated steam, the influence of water droplets on the output of the vortex flowmeter is negligible. Therefore, it can be considered that the output of the vortex flowmeter is completely caused by the dry part (saturated part) of the wet and saturated steam. The density of the dry part can be accurately detected according to pressure compensation or temperature compensation.

When steam metering, if the two parties agree to settle the cost based on the dry part of the steam, there is no charge for condensate. The influence of the phase change on the measurement is negligible and can be ignored. If the condensate is also charged as steam. The measurement result of the vortex flowmeter is low.

After the above evaporation occurs, the former has no effect on compensation. Only the dry part in the steam increases, and the dryness increases accordingly.

In the latter case, the wet saturated steam becomes superheated steam. At this time, the impact on the flowmeter is divided into the following three situations:

  1. The design has taken into account that the steam becomes superheated. Or in what state is difficult to determine. Or sometimes it is overheated and sometimes it is saturated. So use temperature and pressure compensation. Then the above-mentioned phase change has no influence on the measurement result.
  2. Consider saturated steam when designing, and adopt pressure compensation. Then the above-mentioned phase change will bring a smaller error. That is, the compensation error caused by the density difference corresponding to the difference between the superheated steam temperature and the saturated steam temperature.
  3. Consider saturated steam when designing. But use temperature compensation. That is, the superheated steam temperature is regarded as the saturation temperature to check the density table. Generally, large errors will be caused.

There are three ways to solve the above problems:

  1. Install the total steam flow meter before the pressure reducing valve. Because the above steam is not decompressed. There is no phase change problem. So install the flowmeter before the pressure reducing valve. According to the saturated steam compensation method. The measurement accuracy can be guaranteed.
  2. If the flow meter can only be installed behind the pressure reducing valve. A pressure transmitter can be added for temperature and pressure compensation.
  3. If the stability of the pressure reducing valve is better. The upstream pressure value of the flowmeter can be set as a constant value into the display instrument for temperature and pressure compensation.

Sino-Inst, Manufacuturer for Steam Flow Measurement Flowmeters.

Sino-Inst’s Steam Flow Measurement Flowmeters, made in China, Having good Quality, With better price. Our Steam Flow Measurement instruments are widely used in China, India, Pakistan, US, and other countries.

Magnetostrictive Level Gauge Application: Refined Oil Storage Tank

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The magnetostrictive level gauge is applied to the information system of the refined oil storage tank oil depot. Real-time monitoring and measurement management of refined oil storage tanks.

Technical Support

1. Introduction

In order to grasp the operation information of the storage tank in real time and accurately. For example the level, density, pressure, temperature, volume, and quality of the storage medium in the storage tank. To ensure the safety of the storage tank, many oil storage tanks have been studied at home and abroad. Detection and measurement methods and devices. Such as static pressure method, liquid level meter, hybrid method, etc., designed to a variety of measurement technologies, such as pressure type, servo type, radar type, magnetostrictive type, float steel belt type, etc.

Due to many factors such as technology, economy, and use. The monitoring, measurement, and safety management of oil storage tanks in our oil depots mainly rely on manual rulers, manual measurements, and manual inspections. Its measurement accuracy, reliability, maintainability, and real-time performance are difficult to meet the development needs of oil depot informatization construction.

An oil tank level gauge based on magnetostrictive measurement technology has a simple structure and high measurement accuracy. It can measure liquid level, boundary level, multi-point temperature, and other advantages at the same time.

This year, it has been applied more and more in the monitoring and measurement of oil storage depots, such as Sinochem Nantong Oil Depot. Therefore, the magnetostrictive level gauge is applied to the information system of the product oil storage tank oil depot. Real-time monitoring and metering management of refined oil storage tanks. Not only can real-time collection, storage, and management of oil depot receiving, sending, and storing information. It can also reduce staff to increase efficiency and improve oil depot management.

2. Working principle of the magnetostrictive level gauge

2.1 The composition of the magnetostrictive level gauge

The magnetostrictive level gauge is mainly composed of a float (with a magnetic ring inside), a transmitter (or an electronic warehouse is composed of a pulse generator and a receiver), a waveguide equipped with a magnetostrictive wire and a temperature detector. . The transmitter (electronic warehouse) is equipped with a magnetostrictive wire waveguide and temperature detector are integrated structure. The transmitter and temperature detector adopt a modular and integrated design.

2.2 Working process of the magnetostrictive level gauge

The working principle of the magnetostrictive level gauge is mainly to use the combination of magnetic effect and super-generating effect to achieve the purpose of measurement. Magnetic effect and Weidmann effect and Villari effect.

When the transmitter is powered on, the pulse generator and receiver start to work. The pulse generator in the electronic head of the level gauge first applies an electrical pulse signal to the magnetostrictive waveguide wire. This electrical pulse is accompanied by a circular magnetic field. When the magnetic field encounters the longitudinal magnetic field generated by the magnet in the float at the speed of light. It will be vectorially superimposed to form a spiral magnetic field.

According to the Weidmann effect, when the magnetic field of the magnetostrictive material changes. The weak size of the magnetostrictive material itself will also change accordingly. Therefore, when the synthetic magnetic field changes to form a spiral magnetic field, the magnetostrictive waveguide wire will be twisted and deformed. This excites the torsional wave (or return pulse).

The torsion wave will be transmitted back to the induction coil in the sensor head in the form of ultrasonic waves along the waveguide wire and will change. When the coil in the sensor, it will be converted into transverse stress.

According to the Villari effect, when a magnetostrictive material is physically deformed. Will cause changes in the magnetic field strength in the magnetostrictive material. Therefore, the magnetic flux passing through the sensor coil will change, and an induced electromotive force that can be detected will be generated at both ends of the sensor coil. The propagation speed of the supergenerated torsion wave is only related to the elastic modulus and density of the magnetostrictive waveguide filament, which is a constant.

Therefore, the time difference from the moment the current pulse is emitted to the detection of the induced electromotive force is multiplied by this fixed velocity V. The position of the magnet (float) can be accurately calculated. Its liquid level height L=V*(t1-t2).

Extended reading: Fuel-Diesel-Water Tank Level Sensor Monitoring

2.3 Technical characteristics of the magnetostrictive level gauge

The petrochemical industry has gradually paid attention to the monitoring of oil levels. According to the working principle, it can be roughly divided into the following types:

  • Mechanical float level gauge. The price is low, but its accuracy is low, and it cannot meet the requirements for use as a measuring instrument. And the failure rate is high, and the steel belt is prone to jam.
  • Capacitive liquid level gauge. The price is moderate and the measurement accuracy is acceptable. However, due to its large temperature drift, its stability is insufficient, the accumulated error is large, and the measured value is not accurate.
  • Light guide type liquid level gauge. The price is moderate, but the measurement accuracy is low and the stability is poor.
  • Radar level gauge. The price is expensive, the liquid level accuracy, reliability, and stability are all ideal, the installation is also very convenient, and different media are practical.
  • Magnetostrictive liquid level gauge. The price is more expensive, the stability is better, and it is easy to install. But it cannot be used in heavy oil with high viscosity and high density. Of course, the magnetostrictive level gauge has many other outstanding advantages. Specifically in:

① The work is very reliable. Because the second son telescopic level gauge uses the waveguide principle to work. Therefore, there are no mechanical moving parts inside the device, and there are no defects such as wear. The entire converter is enclosed in a stainless steel tube. No contact with the measured medium. Therefore, the sensor works reliably and has a long life span.

②Multi-parameter measurement. Another major feature of the magnetostrictive level gauge is that it integrates measurement of liquid level, water interface, temperature and other parameters. Because the electronic components in the magnetostrictive level gauge can detect the continuous magnetic waves generated by the same emission pulse. Therefore, two or more magnetic floats can be installed on the same sensor. Just ensure that the weight of the float corresponds to the specific gravity of the medium. The liquid level and interface can be measured at the same time, realizing multi-parameter measurement.

③High measurement accuracy. Because the magnetostrictive level gauge uses waveguide pulses to achieve measurement. During work, the displacement of the measured liquid surface is measured by the time difference between the excitation pulse and the induction pulse. Therefore, the accuracy is extremely high, which is a measurement accuracy that is difficult to achieve with other sensors. At roughly the same or lower cost, magnetostrictive level gauges have higher accuracy and better economic benefits than other measuring systems that use capacitance, pressure, mechanical, ultrasonic or servo devices.

④ Good safety performance. The explosion-proof grades of magnetostrictive level gauges are generally flameproof and intrinsically safe. Suitable for working in various flammable, explosive, high temperature, high pressure and other dangerous places. No need to manually open the filling cap during measurement. Avoid the hidden danger of insecurity caused by manual measurement.

⑤ Easy to install and maintain. Since the magnetostrictive level gauge adopts flange connection, the installation is extremely simple. Moreover, the core components are not in contact with the medium, and the product has a modular structure. Intelligent design, no need for regular maintenance and regular calibration, which brings great convenience to users.

⑥Easy to realize networking. The output of the magnetostrictive level gauge is a standard signal. It is convenient for crisis management and can better cooperate with computer. It is also easy to make long-distance transportation possible.

Of course, the change of medium density will have a certain impact on the accuracy of the magnetostrictive level gauge. But it can be installed by installing a suitable float. Reduce the immersion of the float, reduce the outer diameter of the float, and overcome and avoid it to the greatest extent through temperature compensation. After on-site testing, the magnetostrictive level gauge is the same as the radar level gauge, with blind spots and inaccurate measurement of tank bottom oil.

Extended reading: Radar Oil Tank Level Sensor

3. Application of magnetostrictive level gauge in Sinochem Zhuhai Phase II product oil tank

At present, Sinochem Zhuhai Phase II Chenpin Oil Depot with a total of 412,000 m3 has been completed. Among them, the online liquid level monitoring system involving 12 light product oil tanks totaling 192,000 m3 uses magnetostrictive level gauges. The liquid level system consists of a magnetostrictive liquid level gauge, H-500 field display, H-1000 (oil depot) 10.4 inch color touch screen controller and YSMK-YK oil depot information monitoring and management system.

This system can display liquid level, interface height and temperature with H-500 on-site display in the field. In the control room, the H-1000 (oil depot) controller is used to display data in real-time with three-dimensional graphics and digital methods. Use sound and light alarm to prevent oil spill and oil shortage. Therefore, the detailed functions of the system are as follows:

  • Accurate real-time measurement of oil level, water level and temperature. Using 10.4 color LCD screen, the number of storage accuracy points is not limited. It can be customized according to the customer’s volume meter, and the oil height, water height, temperature, volume, and remaining volume can be displayed in graphical and digital ways.
  • Alarm function. The system has multiple alarm functions such as high liquid level (pre) alarm, low liquid level (pre) alarm, and high water level alarm. Use sound and light alarm to prevent oil spill and oil shortage.
  • Self-diagnosis, management and equipment failure alarm.
  • Oil intake report. It is possible to compare the liquid level before and after oil intake. Automatically calculate and save the amount of oil in and out.
  • Communication function. The system is connected to the sensor through a 485 interface for data collection. At the same time, it can provide a built-in Ethernet interface, 2 RS-232 interfaces and an open protocol. Data communication with the local system and remote server.
  • Product lightning protection design. With internal lightning protection and external lightning protection functions. In the event of a lightning strike, the internal circuit automatically discharges the strong lightning current and will not detonate or ignite combustible gas. The external wiring steel pipe is connected to the protective grounding system of the storage tank.
  • Active communication and timing transmission data settings. The system can use external equipment to achieve active communication settings. Be able to set the target server IP address, port, user name, password and data sending time. And upload the data to the target server at the specified time and shift shift.
  • Leak detection function. Due to the high measurement accuracy, the static and dynamic liquid level of the oil tank can be monitored in real time. It can also realize pipeline leakage monitoring in accordance with pipeline leakage testing procedures.

Extended reading: Oil Level Measurement Solutions for the Oil & Gas Industry

Since Sinochem’s Zhuhai Phase II oil depot currently does not have the oil intake conditions, the instrument and system cannot be fully tested and verified. But through other petrochemical companies have used the magnetostrictive level gauge as an oil tank level monitoring system for in-depth understanding. The above-described functions can all be realized, and the measurement accuracy function is carefully compared with the manual ruler. It is found that the accuracy is very high, basically reaching the level of measurement.

In summary, the magnetostrictive level gauge has outstanding advantages such as high reliability, high accuracy, low failure rate, and multi-parameter measurement. It has been regarded by experts in the petrochemical industry as the preferred instrument for liquid level and boundary level measurement. It is an ideal choice for metering and process-level monitoring. Especially in applications where the dielectric constant of the medium is low, the medium is volatile, and the measurement interface is required. Because the magnetostrictive characteristics are not affected by factors such as dielectric constant, temperature, pressure, and meteorological conditions, it has become the first choice for users. Under the trend of industrial production integration and large-scale production. Magnetostrictive level gauges will have a broader application space in future level measurement.

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Industrial Measurement and Control Solutions

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Level Measurement Solutions

Flow Measurement Solutions

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Temperature Transmitters

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Temperature transmitter is an instrument that converts a temperature variable into a standardized output signal that can be transmitted. Output signal 4~20mA two wires.

The temperature transmitter adopts thermocouple and thermal resistance as the temperature measuring element. The output signal from the temperature measuring element is sent to the transmitter module. After voltage stabilization filtering, operational amplification, nonlinear correction, V/I conversion, constant current and reverse After protection and other processing, it is converted into 4～20mA, 0-5V/0-10V signal, RS485 digital signal output.

Sino-Inst offers a variety of  Temperature Transmitters for temperature measurement. If you have any questions, please contact our sales engineers.

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Temperature Transmitter 4-20mA

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.

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.

RTD Temperature Transmitter

RTD Temperature Transmitter

An RTD Temperature Transmitter (Resistance Temperature Detector or Resistance Temperature Device) is one of the most prevalent temperature sensors used in industry today.

Also commonly referred to as PT100/PT1000, its resulting popularity is due to its accuracy and repsonse, at temperatures between -300 to + 600 ° C.

Industrial thermal resistance is used as a temperature measuring sensor. It is usually used with instruments, recorders, and electronic regulators.

Field Mounted HART Temperature Transmitter

Field Mounted HART Temperature Transmitter

The Series SI-SBW HART® temperature transmitter is a 2-wire transmitter, with an analog output.

It has measurement input for resistance thermometers (RTD) in 2-, 3- or 4-wire connections, thermocouples, resistance and voltage inputs.

The transmitter can be programmed with a PC or HART® protocol hand-held terminal.

These small units can be mounted in Pyromation DIN (Form B) connection heads, or they can be used for surface mounting by using a 35 mm DIN-rail mounting clip.

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

What is a temperature transmitter

Temperature transmitter is a device that converts physical measurement signals or ordinary electrical signals into standardized electrical signal output or can be output by means of communication protocols. Mainly used for measurement and control of temperature parameters in industrial processes. The current transmitter converts the AC current of the main circuit under test into a constant current loop standard signal, which is continuously transmitted to the receiving device.

The temperature variable is transformed into the appearance of a transmittable standardized output signal (4-20mA is common in industry).

The temperature transmitter uses thermocouple and thermal resistance as the temperature measuring element. The output signal from the temperature measuring element is sent to the transmitter module. Through voltage stabilization filter, calculation expansion, nonlinear calibration, V/I conversion, constant current and reverse After maintenance and other circuit processing.

Extended reading:  Tri Clamp Sanitary Thermometers

Temperature Transmitter Working Principle

The heat balance is achieved through conduction or convection, so that the indication value of the thermometer can directly indicate the temperature of the measured object. Generally, the measurement accuracy is high.

Within a certain temperature range, the thermometer can also measure the temperature distribution inside the object. But for moving objects, small targets or objects with small heat capacity, larger measurement errors will occur.

The temperature transmitter generally consists of a temperature measuring probe, that is, a thermocouple or thermal resistance sensor and a two-wire solid electronic unit. The temperature measuring probe is directly installed in the junction box in the form of a solid module to form an integrated transmitter.

Temperature transmitters are widely used in industries, agriculture, commerce and other sectors.

With the wide application of cryogenic technology in national defense engineering, space technology, metallurgy, electronics, food, medicine and petrochemical sectors, and the research of superconducting technology.

Low-temperature thermometers that measure temperatures below -153°C have been developed, such as low-temperature gas thermometers and vapor pressure thermometers.

Thermal Resistance
Thermocouple
Bimetallic Thermometers

Sino-Inst, Manufacuturer for Temperature Transmitters, like: Armoured thermocouple, assembly thermocouple, explosion-proof thermocouple, etc.

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

Bimetallic Thermometers

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Bimetallic thermometer is an on-site temperature detection instrument for measuring low and medium temperatures.

The bimetal thermometer is based on a bimetallic sheet wound into a circular bending shape. When one end is heated and expanded, it drives the pointer to rotate, and the working instrument displays the temperature value of the thermoelectric potential. Bimetal thermometer is an on-site temperature detection instrument for measuring low and medium temperatures. It can directly measure the temperature of liquid, steam and gaseous media in the range of -80℃~+500℃ in various production processes.

Sino-Inst offers a variety of  bimetal thermometers for temperature measurement. If you have any questions, please contact our sales engineers.

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Main technical parameters of Bimetallic Thermometers

  1. Product implementation standard: JB/T8803-1998;
  2. Nominal diameter of dial: 60,100,150;
  3. Accuracy grade: (1.0), 1.5;
  4. Thermal response time: ≤40s;
  5. Protection level: IP55;
  6. Angle adjustment error;
    The angle adjustment error should not exceed 1.0% of its range;
  7. Return difference: The return difference of the thermometer should not be greater than the absolute value of the basic error limit;
  8. Repeatability: The repeatability limit range of the thermometer should not be greater than 1/2 of the absolute value of the basic error limit;
  9. Temperature measurement range

Bimetallic thermometer of electric contact point

The electric contact bimetal thermometer is used in the production site to automatically control and alarm the temperature. Directly measure the temperature of body, steam and gaseous media in the range of -80℃~+500℃ in various production processes.

The electric contact bimetal thermometer uses the temperature change to drive the contact change when it is in contact with or disconnected from the upper and lower limit contacts. At the same time, the relay in the circuit is activated, thereby automatically controlling and alarming.

Explosion proof electric contact bimetallic thermometer

The bimetal thermometer can directly measure the temperature of body, steam and gas medium and solid surface in the range of -80℃~+500℃ in the process of explosives such as hydrocarbons and other explosives at the production site.

Main technical parameters

  • Nominal diameter of dial: 100
  • Thermal response time: ≤40s
  • Explosion proof grade: dⅡBT4
  • Rated power: 10VA
  • Maximum operating voltage: 220V
  • Maximum operating current: 0.7A

Remote Bimetallic thermometer

The bimetal thermometer and thermocouple (resistance) are integrated. It not only meets the needs of on-site temperature measurement, but also meets the needs of long-distance transmission. It can directly measure the temperature of liquid, steam and gas medium and solid surface in the range of -80℃~+500℃ in various production processes.

Main technical parameters

  1. Nominal diameter of dial: 100, 150
  2. Thermal response time: ≤40s
  3. Accuracy grade: (1.0), 1.5
  4. Thermocouple; Class I, 1.5℃; Class II, 2.5℃
  5. Thermal resistance: Class A, ±(0.15+0.005 ItI) Class B, ±(0.30+0.005 ItI)
  6. Protection level: IP55

Digital Thermometer/Transmitter

SI-DTM Digital Thermometer/Transmitter

Digital Thermometer/Transmitter is practically used to measure medium and low temperature field detection instruments. It can be used to directly measure the temperature of gases such as liquids. Compared with glass mercury thermometers, it has the advantages of no mercury hazard, easy reading, strong and durable. It can directly replace double Metal, pressure type, glass mercury thermometer, etc. At the same time, the defects of bimetal thermometers cannot be bent and used restrictions are changed.

Adjustable Angle Bimetal Thermometer
Bottom Connect Bimetal Thermometer
Back Connect Bimetal Thermometer
Sanitary Bimetal Thermometers

For the installation of bimetal thermometers, attention should be paid to accurate temperature measurement, safety and reliability, and convenient maintenance. And it does not affect equipment operation and production operations.

The above requirements must be met. When choosing the installation location and insertion depth of the thermal resistance, pay attention to the following A few points:

(1) In order to have sufficient heat exchange between the measuring end of the thermal resistance and the measured medium, the location of the measurement point should be selected reasonably and try to avoid installing thermal resistance near the dead corner of the valve, elbow, pipeline and equipment.

(2) Thermal resistors with protective sleeves have heat transfer and heat dissipation losses. In order to reduce measurement errors, thermocouples and thermal resistors should have sufficient insertion depth:

a. For the thermal resistance measuring the temperature of the fluid in the center of the pipeline. Generally, the measuring end should be inserted into the center of the pipeline (vertical installation or inclined installation). If the pipe diameter of the fluid to be measured is 200 mm, the insertion depth of the thermal resistance should be 100 mm;

b. For temperature measurement of high temperature, high pressure and high speed fluids (such as main steam temperature). In order to reduce the resistance of the protective sleeve to the fluid and prevent the protective sleeve from breaking under the action of the fluid.

The shallow insertion method of the protective tube or the hot sleeve type can be adopted Thermal resistance. Shallow plug-in thermal resistance protection sleeve, the depth of its insertion into the main steam pipe should not be less than 75mm. The standard insertion depth of thermal resistance is 100mm;

c. If you need to measure the temperature of the flue gas in the flue. Although the flue diameter is 4m, the insertion depth of the thermal resistance is 1 m;
d. When measuring the original insertion depth more than 1m, it should be installed vertically as far as possible. Or add support frame and protective sleeve.

Thermal Resistance
Thermocouple
Bimetallic Thermometer—-WSS Series

Sino-Inst, Manufacuturer for Thermal Resistances, like: Armoured thermocouple, assembly thermocouple, explosion-proof thermocouple, etc.

Sino-Inst’s Thermal Resistances, made in China, Having good Quality, With better price. Our Temperature measurement instruments are widely used in China, India, Pakistan, US, and other countries.

Thermal Resistance

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Thermal resistance is the most commonly used temperature detector in the medium and low temperature areas.

Thermal resistance is based on the characteristic that the resistance value of a conductor or semiconductor changes with temperature to measure temperature and temperature-related parameters. Thermal resistors are mostly made of pure metal materials. Currently, platinum and copper are the most widely used. Materials such as nickel, manganese and rhodium have been used to make thermal resistance. Thermal resistance usually needs to transmit the resistance signal to the computer control device or other secondary instruments through the lead.

Sino-Inst offers a variety of  Thermal Resistance for temperature measurement. If you have any questions, please contact our sales engineers.

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Sheathed thermal resistance

Sheathed thermal resistance uses the feature that when the
temperature of the material changes, its resistance will change too. When the resistance changes, the instrument will display relevant temperature corresponding to the resistance.

It is usually used along with display instruments, recording
instruments, electronic computers and so on. It is able to directly measure the temperature of liquid, steam and gas and solid surface within the range of -200℃～500℃.

Tolerance level

Assembling thermal resistance

The assembled PT100 thermal resistance is assembled by thermal resistance/platinum resistance element, metal protection tube, magnesium oxide insulating powder, and extension wire.

The product has a simple structure and a wide range of applications. This method is used in most thermal resistance temperature measurement occasions. According to the requirements of different customers, it is made of wear-resistant, anti-corrosion, explosion-proof, waterproof and high-temperature resistant types.

  1. With temperature-sensing element of pressure spring type, so it has good anti-vibration performance;
  2. With no compensation wire, which is cost-saving
  3. High measurement accuracy;
  4. High mechanical strength, good pressure resistance;
  5. Imported thin-film resistor with reliable and stable performance;

Explosion-proof thermal resistance

Explosion-proof thermal resistance is based on the principle of explosion-proof material gap. Design the junction box and other components with sufficient strength. All parts that generate sparks, arcs and dangerous temperatures are sealed in the junction box cavity. When an explosion occurs in the cavity, The flame can be extinguished and cooled through the gap of the joint surface, so that the flame and temperature after the explosion can not be transmitted to the outside of the cavity. Therefore, explosion-proof.

Range of temperature measurement and the error tolerance

Evidence list

PT100

Pt100 is a platinum thermal resistance, its resistance is proportional to the change of temperature. It is often used for temperature detection in low temperature areas. It realizes the functions of industrial field temperature control signals of one input and two output, and one input and four output.

Pt100 platinum thermal resistance is currently widely used in high-precision temperature equipment such as medical, electrical, industrial, temperature calculation, resistance calculation, etc.

The main types of thermal resistance:

①Ordinary thermal resistance

From the temperature measurement principle of the thermal resistance, the change of the measured temperature is directly measured by the change of the resistance of the thermal resistance. Therefore, the change of the resistance of various wires such as the lead wire of the thermal resistance will affect the temperature measurement.

②End surface thermal resistance

The end-face thermal resistance temperature-sensing element is wound by a specially treated resistance wire, which is closely attached to the end face of the thermometer. Compared with general axial thermal resistance, it can reflect the actual temperature of the measured end surface more accurately and quickly. It is suitable for measuring the end surface temperature of bearing bushes and other mechanical parts.

③Armored thermal resistance

The armored thermal resistance is a solid body composed of temperature sensing elements (resistors), lead wires, insulating materials, and stainless steel sleeves. Its outer diameter is generally φ2–φ8mm, and the smallest can reach φmm.
Compared with ordinary thermal resistance, it has the following advantages:

  1. Small size, no internal air gap, thermal inertia, small measurement lag;
  2. Good mechanical properties, vibration resistance and impact resistance;
  3. It can be bent and is easy to install;
  4. Long service life.

④Explosion-proof thermal resistance

Explosion-proof thermal resistance through the junction box of special structure, the explosion of explosive mixed gas inside the shell due to the influence of sparks or arcs is confined in the junction box, and the production site will not cause excessive explosion. Explosion-proof thermal resistance can be used for temperature measurement in places with explosion hazard in Bla-B3c level zone.

The difference between thermal resistance and thermocouple

Difference 1: The principle of temperature measurement is different

Thermal resistance temperature measurement is based on the characteristic that the resistance value of a metal conductor increases with temperature. Its 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.

The thermocouple welds two conductors or semiconductors A and B of different materials to form a closed loop. When there is a temperature difference between the two attachment points 1 and 2 of the conductors A and B, an electromotive force is generated between the two. Thus, a large current is formed in the loop. This phenomenon is called the thermoelectric effect.

Difference 2: The classification of thermocouple and thermal resistance is different.

The common thermal resistance materials are mostly single metal. The most widely used thermal resistance materials are platinum and copper. Platinum resistance has high precision, good stability, and certain nonlinearity. The higher the temperature, the smaller the resistance change rate. Copper resistance There is a linear relationship between the resistance value and the temperature in the temperature measurement range, the number of temperature lines is large, and it is easy to be oxidized if it exceeds 150. The index numbers of the thermal resistance are Cu50, Pt100, Pt1000, etc. The letter in the front refers to the material of the thermal resistance, and the number behind is the resistance value of the thermal resistance.

A thermocouple is composed of two different conductors (called thermocouple wires or thermoelectrodes) connected at both ends into a loop. The common K-type thermocouple is composed of nickel-chromium-nickel silicon. Standardized thermocouples China Since January 1, 1988, thermocouples and thermal resistances have all been produced in accordance with IEC international standards. Seven standardized thermocouples of S, B, E, K, R, J, and T are designated as China’s unified design. Thermocouple.

Difference 3: Different temperature range

Thermal resistance is a commonly used temperature sensor in the middle and low temperature areas. It is divided into platinum thermal resistance, copper thermal resistance, etc. The temperature measurement range is also different. In general, thermal resistance can measure the temperature from -200 to 600 ℃.

Compared with the thermal resistance, the temperature measurement range of the thermocouple is much larger. The B-type thermocouple with the largest temperature measurement range can even measure the temperature of 0-1800 ℃. The ordinary K-type thermocouple can also measure Temperature of -40-1200℃. But because the measurement of thermocouple in low temperature area is not very accurate. Therefore, it is more appropriate to use thermal resistance when measuring lower temperature.

Difference 4: Different connection methods

There are currently three main ways to connect thermal resistance: two-wire, three-wire, and four-wire. The accuracy of the two-wire system is relatively low, while the four-wire system is more used for accurate measurement in the laboratory. Most of our commonly used thermal resistances are three-wire systems. This is because the circuit for measuring thermal resistance is generally an unbalanced bridge. A three-wire system is used. One wire is connected to the power terminal of the bridge. The other two are connected to the heat. The bridge arm where the resistance is located and the bridge arm adjacent to it. This can eliminate the measurement error caused by the wire line resistance, and greatly improve the accuracy.

Thermocouples are not so particular about thermal resistance. They are all two-wire systems. Unlike thermal resistance, the output resistance of thermocouple is mV signal.

Thermocouple
Bimetallic Thermometer—-WSS Series
What Is Thermal Resistance

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