High Accuracy Pressure Transducers

Posted on August 21, 2022 by KimGuo11

High Accuracy Pressure Transducers are also called high precision pressure transducers or high accuracy pressure sensors. Sino-Inst manufactures various types of High Accuracy Pressure Transducers.

From the perspective of accuracy, the accuracy of conventional pressure transmitters is 0.5%. Therefore, pressure transmitters can be divided into high-precision pressure transmitters (0.1% or 0.2% or 0.075%) and general pressure transmitters ( 0.5%).

High Accuracy Pressure Transducers support mV/V, V, mA and digital outputs. Ideal for applications requiring very high precision measurements such as oil, gas and geothermal energy exploration.

RFQ Pressure Sensors

Featured High Accuracy Pressure Transducers for Sale

**SI-703 Flush diaphragm pressure sensor**

**SI-706 Combined Pressure and Temperature Sensor-Dual function**

**SI-512H High Temperature Pressure Sensor**

**Flange Mounted Differential Pressure Transmitter**

**Differential pressure(DP) level transmitter**

When ordering a pressure transmitter, you can often be asked what accuracy pressure transmitter you need. Then our sales engineer will tell you that we have 0.5% accuracy and 0.1% accuracy. Even higher precision ones can be customized.

Also, different accuracy may affect the price of the pressure transmitter. So what is the accuracy of the pressure transmitter? Do we need to blindly pursue higher-precision pressure transmitters?

Extended Reading: 4-20ma pressure transducer wiring diagram

What is the accuracy of a pressure transmitter?

The accuracy of the pressure transmitter is the same as that of all measurement and display instruments, and it is an indicator of the reliability of the measured value of the instrument.

The instrument has a maximum allowable error (deviation), and the probability of more than 98% of the results obtained from N times of measurements on the same measured value does not exceed this range.

Maximum allowable error / measuring range * % = meter accuracy

For a pressure transmitter with an accuracy of class 0.1,

Output allowable error = output range * instrument accuracy% = 16 * 0.001 = 0.016 (mA)

That is, the maximum possible error when this meter is measured is plus or minus 0.065mA.

Extended reading: Pressure Sensor Applications-Featured Industry Applications

A pressure transmitter in the general sense is mainly composed of a load cell sensor (also called a pressure sensor), a measurement circuit and a process connection. It can convert physical pressure parameters such as gas and liquid sensed by the load cell sensor into standard electrical signals (such as 4~20mADC, etc.) to supply secondary instruments such as indicating alarms, recorders, and regulators for measurement and indication. and process regulation.

The pressure transmitter is an instrument that accepts pressure variables and converts the pressure changes into standard output signals in a certain proportion after sensing and conversion. The output signal of the transmitter is transmitted to the central control room for pressure indication, recording or control.

Usually, when considering the overall accuracy of the pressure transmitter, the factors that affect the accuracy of the pressure transmitter generally need to be considered.

According to the experience of Sino-Inst, we believe that everyone should choose the tolerance of the pressure transmitter according to the requirements of the industrial process. Instead of selecting according to the pressure transmitter indicators installed in the field.

Extended reading: Water Pressure Sensors for Measurement of Water Pressure

Factors affecting the overall accuracy of pressure transmitters

In the pressure transmitter manual or website, there is usually a separate and limited description of the accuracy. It might be called “reference precision” or something similar. But this only includes some of the factors that affect accuracy, not all. For example it only includes nonlinearity, hysteresis and repeatability.

This “best accuracy” does not take into account all factors that affect accuracy in practice (installation location, ambient temperature, etc.).

Therefore, do not think that the pressure transmitter is installed in an industrial process. This precision can be achieved in practical applications.

For a high-accuracy pressure transmitter, the “best accuracy” might be 0.04% or 0.025% of the pressure span.

The best (reference) accuracy is generally only for a few pressure ranges, not the full pressure range. And, it may vary with different pressure types. That is, the absolute range is not necessarily equal to the full range.

Accuracy specifications may be doubled or tripled for different ranges.

So make sure you know the accuracy for the pressure range/model you are using.

Extended Reading: strain gauge pressure transducer

The HART intelligent pressure transmitter can rescale its accuracy range in any ratio. Pressure transmitters can typically be scaled by 100:1 or higher adjustment specific gravity. Accuracy specifications typically give either full scale or a limited turndown ratio.

If the HART smart pressure transmitter is re-ranged to less than full scale, the accuracy specification will usually be degraded.

Therefore, if you re-range the pressure transmitter to less than the maximum range, you need to confirm how much accuracy error is incurred.

Most pressure transmitters in use are subject to changing environmental conditions. Likewise, the temperature of the pressure medium may vary considerably during use.

Like most measuring devices, pressure transmitters usually have some kind of temperature coefficient, a factor that affects accuracy depending on the ambient temperature. This temperature-dependent property seems to be commonly specified in an incomprehensible expression.

But try to understand this, and if you can’t figure this out, ask the pressure transmitter manufacturer.

It may vary from 0.01% to 0.5% of span for different pressure transmitters.

The worst-case pressure model indicated temperature effects may exceed 1% of range.

You should take this into account if the temperature varies widely during use.

The differential pressure transmitter can be used under the condition of pipeline static pressure. This means that both inputs have a certain pressure, and the differential pressure transmitter measures the difference between the two inputs. It is different from a transmitter that measures pressure under atmospheric conditions or a transmitter that measures absolute pressure under complete vacuum conditions.

An ideal differential pressure transmitter can only measure the difference between the inputs. But static line pressure actually has some effect on the output. If both inputs are at atmospheric pressure, the differential pressure is naturally zero.

Likewise, if the same pressure (say 50 bar/psi) is applied to both inputs, the differential pressure is still zero.

In fact, static pressure will have a certain effect on the output of the transmitter.

Therefore, when the static pressure changes, the differential pressure transmitter output also changes slightly.

Static pressure effects typically vary from 0.025% to 0.4% of span, depending on the differential pressure transmitter model.

Static pressure generally mainly changes the zero position of the differential pressure transmitter without significantly affecting the measurement full scale. Therefore, in the calibration process, after applying the same pressure (high pressure or low pressure) to both input terminals, observe the change value of the zero position of the differential pressure transmitter to verify this effect.

Line pressure may also have an effect on the measuring range of the differential pressure transmitter, which increases the difficulty of operation and calibration. It needs to be calibrated using a differential pressure standard.

More About: Differences! Static pressure vs dynamic pressure vs total pressure.

All measuring equipment will gradually lose accuracy over time. Some increase, some decrease. The same goes for pressure transmitters. Some pressure transmitters have a one-year stability guarantee, and some are even 5 or 10 years or more.

For example, a pressure transmitter with a reference accuracy of 0.04% of span can have an annual stability of 0.2% of span. For some other models, 0.2% span stability can be effective for 5 or even 10 years.

Depending on how often the pressure transmitter is recalibrated, you should consider long-term stability effects, as the pressure transmitter may drift significantly before the next recalibration (and possibly trim).

The installation location often affects the accuracy of the pressure transmitter. Most pressure transmitters will specify a mounting location.

Changing the installation orientation will generally cause the zero position of the pressure transmitter to change, but will not affect the accuracy of the full scale measurement. In fact, the mounting orientation of the pressure transmitter does not change during normal use. The location of the pressure transmitter should be considered when the pressure transmitter is calibrated in the workshop and installed in an industrial process, or when the pressure transmitter is removed from an industrial process for recalibration.

Of course, if the transmitter is a remote differential pressure type, the installation position of the capillary will have a great influence on the zero value. Again, this isn’t something that doesn’t change during normal use. Calibration may be affected if the remote differential pressure transmitter is removed from the installation location.

Many pressure transmitters specify vibration effects. Of course, this only needs to be considered when the pressure transmitter is installed in a vibrating location. The effect of vibration on accuracy is usually small, eg “less than 0.1% of span”.

The two-wire pressure transmitter will not work when the external power supply is not connected. The common power supply is 24VDC power supply. Pressure transmitters can usually operate over a wide supply voltage range, even down to 10 VDC. However, when the supply voltage changes during operation, it has little effect on the accuracy of the pressure transmitter.

For example, it can be specified as “every 1V of power supply voltage will produce less than 0.01% change of measurement range”. In fact, when the power supply can be used normally, there is generally no problem.

The index parameters of the overall accuracy of some pressure transmitters contain several common factors that affect the accuracy. These include the “reference accuracy” mentioned above and the effect of ambient temperature and static/line pressure. This overall accuracy is easier to grasp because it is closer to what a pressure transmitter can achieve.

For example, an “overall accuracy” specification might be 0.14% of span, while the reference value is 0.04%. Therefore, once temperature and line pressure effects are included, the reference accuracy is multiplied by 3-4.

Another example is that there is a 0.075% range reference accuracy, when the temperature effect is considered, the accuracy is reduced to 0.2% of the range, and when the static pressure effect is further considered, the accuracy is reduced to 0.3% of the range.

If the index parameters of the overall accuracy of the pressure transmitter are clear. This will help you gain an in-depth understanding of the type of accuracy that can be achieved in practice. Even these overall accuracies are often missing some of the factors listed in this paper.

When using a pressure transmitter to measure pressure, there is a risk that the membrane of the transmitter will be contaminated by the pressure medium or some dirt. Such contamination can seriously affect the accuracy of the pressure transmitter.

Of course, this is not something that is explicitly stated. But it can also be considered a big risk in normal use, especially if you decide to recalibrate with a long period of time (eg, years). Therefore, in addition to the long-term drift indicator parameters of the pressure transmitter, this needs to be considered in the risk analysis.

If the pressure transmitter gets very dirty and starts to experience significant measurement errors, you will generally find this in the measurement results.

However, if it is only a small error, it is difficult to notice it in normal use.

Checklist: Pressure Transmitter 4-20mA Common Faults and Error

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

pressure transducer 4-20mA

Many friends have some misunderstandings about this issue, and feel that 4-20mAdc is more troublesome to calculate. So why use 4-20mAdc?

The field two-wire pressure transmitter needs power supply. First, it is necessary to ensure that there is still a certain current in the case of zero position. Then in the design, we found that the minimum starting current of the transmitter is 3.5mA, which means that the transmitter can still work under 3.5mA.

Then if it is 0mA, then there is no power supply and it cannot work.

So use 4mA as the zero position, if it starts at 0mA, the meter will not work. If there is a disconnection in the field, there is no way to tell if it is a problem with the meter or the power supply. Therefore, the international general standard starts from 4mA.

The second question, why is it 20mA? Why not 30mA? Why not 100mA?

It stands to reason that the bigger the better, the higher the resolution, but it is not.

Through the observation of the gas explosion point, it is found that the spark generated when the 20mA is switched on and off will not cause the gas explosion. 20mA is a critical value, so ≤20mA is safe. If >20mA, there will be an explosion problem, so 4-20mA is a better value.

Then there are also some occasions where 0-10mA is used, which is generally not used in the process industry. It may be used in the discrete industry. There are also some occasions where 0.5v-4.5v or 0-5v are used in the discrete industry. Then for the process industry, it is mainly 4-20mA.

Sino-Inst is a pressure transmitter manufacturer, the main products include intelligent pressure transmitter, digital pressure transmitter, high temperature pressure transmitter, sanitary pressure transmitter, compact pressure transmitter, liquid level pressure transmitter transmitter, differential pressure transmitter, etc., the product series is complete, high precision, welcome to inquire!

Extended Reading: Smart pressure transmitter

Frequently
Asked
Questions

Help Center

In fact, we believe that there is no best pressure sensor, only the most suitable pressure sensor.
There are thousands of pressure sensor brands and models on the market. Each type of pressure sensor has its own advantages. Therefore, only a pressure sensor that satisfies specific measurement conditions is a suitable pressure sensor, that is, the best pressure sensor.

As long as we choose a pressure sensor, remember a few words: type, range, overload, medium, temperature, accuracy, signal, process connection. A suitable pressure sensor can be selected.

The high pressure sensor mainly measures pressure, that is, converts the measured pressure value into a current or voltage signal, and the converted current or voltage signal can be processed by the circuit and output to meet the standard.

Simply put, the function of the high pressure sensor is to feel the measured value within a specified range and convert it into a signal according to a certain law.

With the development of technology, high pressure sensor has the most primitive mechanical structure into the current semiconductor material structure. So its volume and weight are greatly improved. No longer as bulky and large as before. In addition, the sensitivity and accuracy are also greatly improved, and the installation and debugging are extremely convenient.

Read more about: Features of SI-702 High Pressure Sensor

The two most commonly used types of pressure sensors are diffused silicon and capacitive.

Pressure transmitters can be categorized into four main types:

Gauge Pressure Transmitter.
Absolute Transmitters.
Differential-Pressure Transmitter.
Multivariable Pressure Transmitters.

High pressure transducer is used to measure high pressure up to 1500Mpa. Also called ultra high pressure transducer.

High pressure transducer adopts ultra high pressure design. Suitable for high pressure applications up to 15000bar. SI-702S series ultra high pressure pressure transducer can provide reliable ultra-high pressure measurement. Ultra high pressure transmitter adopts rare metal alloy material. After special process treatment, integrated design. All stainless steel welding package. Laser resistance temperature compensation. With high performance digital processing circuit. The factory has undergone high and low temperature aging and long-term fatigue tests. Good long-term stability. Ultra-long working life. Maintain safe and stable operation in the ultra-high pressure range.

The pressure sensor converts non-electrical physical quantities such as gravity, pressure, liquid level, material characteristics, etc. into electrical signals or directly sends physical quantities such as pressure, liquid level, etc. to the pressure transmitter.

The pressure transmitter is to amplify the weak electrical signal collected by the pressure sensor in order to transmit or start the control element. Or a signal source that converts the non-electrical input from the sensor into an electrical signal and amplifies it for remote measurement and control. The analog quantity can also be converted into a digital quantity as required.

The pressure sensor and the pressure transmitter together constitute an automatically controlled monitoring signal source. Different physical quantities require different pressure sensors and corresponding pressure transmitters.

Flat Pressure Sensor for High Viscosity Fluids

Posted on August 16, 2022 by KimGuo11

Flat Pressure Sensor is a type of pressure sensor that specifically refers to the measurement diaphragm without pressure holes. Also known as a flat film pressure sensor.

Flat Pressure Sensor is a special pressure sensor most commonly used in industrial automatic control. It is widely used in the pressure measurement and control of viscous media such as chemical coatings, paints, mud, asphalt, crude oil, etc. It solves the problem that conventional products are easy to block and cannot be used continuously, etc. defect.

The Flat Pressure Sensor elastomer adopts imported materials, diaphragm isolation technology, no pressure holes in the test head, and no viscous medium clogging during the measurement process.

RFQ Pressure Sensors

Main parameters of Flat Pressure Sensor

Range:	0-0.6, 1, 5, 10, 20, 30, 40, 50～200MPa
Comprehensive accuracy:	0.1%FS, 0.2%FS, 0.5%FS
Output signal:	4-20mA (two-wire system), 0-5/1-5/0-10VDC (three-wire system)
Supply voltage:	24VDC (10-30VDC)
Medium temperature:	-20～85℃～450℃
Ambient temperature:	-20～85℃
Load resistance:	current output type: maximum 800Ω; voltage output type: greater than 50KΩ
Insulation resistance:	greater than 2000MΩ (100VDC
Sealing class:	IP65
Long-term stable performance:	0.1%FS/year
Vibration influence:	within the mechanical vibration frequency of 20Hz ~ 1000Hz, the output change is less than 0.1%FS
Electrical interface:	metal sealed terminal, four-core aviation connector
Mechanical connection:	M20×1.5, G1/2-14, etc. Other threads can be customized according to customer requirements

Extended Reading: Fluid pressure sensor

Principle of Flat Pressure Sensor

The flat membrane pressure sensor test head adopts the pressure-free mode to ensure that there is no blockage of viscous media during the measurement process, and to ensure that the pressure detection works normally.

It adopts super-large diaphragm design, the core adopts highly sensitive material, diaphragm isolation technology, and integrated structure design.

The medium and high temperature pressure-sensitive chip and heat pipe structure are used in the measurement of high temperature medium, which effectively solves the drawbacks that the electronic components inside the sensor cannot withstand high temperature.

Extended Reading: Resistive Pressure Transducer

Application of Flat Pressure Sensor

Pressure measurement and control of viscous media such as chemical coatings, paints, mud, asphalt, and crude oil;
Viscous liquid, fluid;
It is suitable for pressure measurement and control in harsh working environment, explosion-proof and explosion-proof occasions;

Extended reading: LCD Display Oval Gear High Viscosity Flow Meter

We also supply a variety of chemical flow meters in corrosion-resistant materials.

More Featured Pressure Transmitters

**Remote Seal Differential Pressure Transmitter**

**Extended Diaphragm Seal DP Level Transmitter**

Frequently
Asked
Questions

Help Center

A pressure transducer often called a pressure transmitter, is a transducer that converts pressure into an analog electrical signal.

Although there are various types of pressure transducers, one of the most common is the strain-gage base transducer.

The conversion of pressure into an electrical signal, is achieved by the physical deformation of strain gauges, which are bonded into the diaphragm of the pressure transducer, and wired into a Wheatstone bridge configuration.

Pressure applied to the pressure transducer produces a deflection of the diaphragm, which introduces strain to the gages.

The strain will produce an electrical resistance change proportional to the pressure.

Extended reading: Pressure transmitter working principle

Fluid Pressure Sensors refers to sensors that can be used to measure the pressure of liquid media. Such as measuring pressure of Oil, Fuel and other fluid systems (select a sensor with the appropriate range for your system). Fluid Pressure Sensors have important uses. For example, the direct measurement of pressure in a fluid line. For example, put Fluid Pressure Sensors into the liquid, measure the liquid pressure, and estimate the liquid level. For example, by measuring the differential pressure of Fluid, the flow rate of the pipeline can be calculated.

Extended reading: How do fluid pressure sensors work?

There are many types of pressure sensors. Such as resistance strain gauge pressure sensors, semiconductor strain gauge pressure sensors, piezoresistive pressure sensors, inductive pressure sensors, capacitive pressure sensors, resonant pressure sensors, etc.

Extended reading: wireless pressure transmitter working principle

Currently, the most widely used pressure sensors include:

Diffused silicon piezoresistive pressure sensor,
Ceramic piezoresistive pressure sensor,
Sputtering thin film pressure sensor,
Capacitive pressure sensor,
Sapphire pressure sensor with high temperature resistance.
But the most widely used is the piezoresistive pressure sensor, which has a very low price, high accuracy and good linearity.

Extended Reading: Electronic Pressure Switch for Air Compressor

Non Contact Flow Meters Measure Liquid Flow

Posted on August 14, 2022 by KimGuo11

What is non contact flow meter?

Non Contact Flow Meters refers to flow meters that can achieve flow measurement without contacting the fluid medium. No need to destroy the pipeline. Easy to install and remove. This is a good choice for many pipes with strict hygiene requirements or only temporary measurements.
Non Contact Flow Meters supplied by Sino-Inst are suitable for various pipe material requirements: stainless steel pipe, carbon steel pipe, copper pipe, plastic pipe (PVC, PVDF, PPR, PPH, HDPE, etc.). It can also meet the measurement of different clean fluids: various acids, chemical solvents, alcohol, beverage water, Coca-Cola, etc.

RFQ Flow Meters

Featured Non Contact Flow Meters

Types of Non Contact Flow Meters

Currently, the main Types of Non Contact Flow Meters on the market are ultrasonic flow meters and radar flow meters.

Non-contact ultrasonic flowmeters account for 90% of non-contact measurement applications. Mainly used for flow measurement of various pipeline fluids.

Non-contact radar flowmeter is suitable for non-contact flow measurement of rivers, channels, pipelines, etc.

Clamp-on ultrasonic flowmeters utilize ultrasonic technology for easy and quick installation. Applicable to a variety of materials and pipes of different diameters. Delivers incredible measurement results even when compared to electromagnetic flow products.

The non contact ultrasonic flow meter only needs to install a very small ultrasonic sensor on the outside of the pipe without destroying the pipe. It can provide completely reliable measurement results while saving a lot of installation costs.

The transducer and the converter are connected by a special signal transmission cable. In the case of fixed measurement, a junction box should be installed in an appropriate place. Clamp-on transducers usually also require mounting clamps and couplant.

Extended reading: Totalizing flow meter water

Non-contact radar flowmeters are used for flow measurement in drains, drains, and rivers. Suitable for surface flow velocity for easy measurement. It can be used for long-term flow monitoring of various non-full drainage pipes, open channels (rectangular, trapezoidal, etc.), weirs, grooves, etc. and surface runoff. Instantaneous liquid level, flow rate and flow can be automatically recorded.

It can work stably in complex environments such as inspection wells that are wet, full of toxic and harmful, flammable and explosive gases. Due to non-contact, it is suitable for monitoring of fast flow monitoring points. And compared to contact equipment, installation and maintenance are simpler. But it cannot work under long-term immersion and overflow conditions.

It can meet the needs of system monitoring and data transmission without AC power and network access. And has excellent sealing performance, with anti-corrosion, explosion-proof function.

It can be maintenance-free on a daily basis, run regularly for inspection, and no need for manual on-duty. Measurement information can be stored locally and sent wirelessly. With early warning and cloud management functions, it can be set remotely.

Strap on Flow Meter for Small Pipes Φ9.53~Φ90

Strap on flow meter X3 is widely used in flow measurement and monitoring in the production process.

Strap on flow meter X3 can meet the needs of different pipe materials: stainless steel pipe, carbon steel pipe, copper pipe, plastic pipe (PVC, PPR, PPH, HDPE), etc.

Strap on flow meter X3 almost meets the measurement of different clean fluids: various acids, alcohols, chemical solvents, alcohol, drinking water, Coca-Cola water… etc.

Product	Strap on Flow meter
Model	X3
Flow range	0.1m/s~5.0m/s
Accuracy	±2.0%
Repeatability	0.80%
Pipe size	φ6.35~φ90
Data storage	Daily, monthly, and Annual. Flow Totalizer
Analog output	4~20mA, Maximum load: 600Ω
Alarm output	DCT, Upper and lower limit alarm function(optional)
Communication	RS485,support Modbus communication protocol
Power supply	24VDC
Cable length	2.0m
Keypad	Four light touch buttons
Screen	OLED 128*64 displayscreen
Units	Metric and imperial units are available, Cubic Meters(m3), Liters(L), USA Gallons(GAL)/hour,/min,Default unit setting:m3/h
Totalizer	Six bit digit
Piper material	Stainless steel pipe, carbon steel pipe, copper pipe, plastic pipe
Case material	Aluminum alloy
Environment temp.	0℃~50℃（32°F~122°F)
Medium temp.	0℃~50℃（32°F~122°F)
Environment humidit	0-95% relative humidity, without condensation
IP Grade	IP54

Extended Reading: Types Of Crude Oil Flow Meters

More Featured Liquid Flow Meters

Flow Meter Selection Guide 101: Find the Perfect Fit for Your Application

Non Contact Liquid Measurement Solutions

Clamp on Water Flow Meter

What is Clamp on Water Flow Meter? Clamp on Water Flow Meter is also known as the clamp-on…

Strap on Ultrasonic Flow Meters

What is Strap on Ultrasonic Flow Meters? Strap on Ultrasonic Flow Meter is also often called Clamp On…

Ultrasonic Flow Detectors

Ultrasonic flow detectors are an important part of ultrasonic flow meters. Ultrasonic flow detectors are also called ultrasonic…

How to Select Ultrasonic flow detectors?

What is an ultrasonic flow detector? An ultrasonic flow detector is often understood as an ultrasonic flow meter…

Ultrasonic water flow meters | Accurate and Easy solution

The ultrasonic water flow meter is a meter that measures water flow by detecting the effect of water…

Cheap flow meters-Low Cost measurement solutions

Cheap flow meters means to choose the lowest cost flow meter while satisfying your measurement needs. How to…

Clamp on Flow Meters for Liquid Pipes

Clamp on flow meters refers to the non-contact flow meter, or strap-on flow meters, which clamps the ultrasonic…

Ultrasonic flow measurement

Ultrasonic flow meters, using the ultrasonic principle, measure the velocity of flow. We can use a different type…

Gas and Liquid Measurement Solutions

Mechanical Oil Flow Meters

What is mechanical oil flow meter? Mechanical oil flow meter refers to a flowmeter that can detect the volume flow…

Kerosene Gasoline/ Kerosene Flow Meter

A kerosene flow meter is a flow meter that can be used to measure the flow of kerosene. Kerosene is…

Slurry Flow Meter

Flow Meter for Slurry Application Slurry is a product of domestic sewage and industrial wastewater treatment. Slurry consists of solid…

Digital Flow Meter for Argon Gas

What is Digital Flow Meter for Argon Gas? Digital flow meter for argon gas refers to a flow meter that…

PD Flow Meters Selection and Application | Oil-Liquid

What is PD flow meter? PD flow meters (positive displacement flow meters) are the only flow measurement technology that directly…

Guide for Digital Fuel Flow Meter

Digital Fuel Flow Meter is a flow meter dedicated to measuring fuel, diesel, gasoline, and petroleum. Digital Fuel Flow Meter…

Mechanical Water Flow Meters

Mechanical water flow meters refer to a type of flow meter suitable for clean water processes or applications. The working…

Explore Oil and Gas Flow Meters

An oil and Gas Flow Meter is A device installed in a pump manifold or treating line to measure the…

Gear Flow Meter-High Viscosity Fluid-Micro Flow Solution

A gear flow meter is a common positive displacement flow meter. The gear flow sensor has built-in double gears to…

Molasses Flow Meters-High Viscosity Liquids Solution

Molasses flow meters are a type of flow meter used for molasses flow measurement. Molasses are common high viscosity liquids…

Solvent flow meters

The solvent flow meter is a flow meter that can measure solvent volume or mass flow. In the industrial production…

Grease Flow Meters

What is a Grease Flow Meter? Grease Flow meters are meters dedicated to measuring the volume or mass flow of…

How does a residential water meter work?

What does a residential water meter look like? A residential water meter is a legal meter for measuring water consumption…

Frequently
Asked
Questions

Help Center

If you let me answer this question. I would like to divide flow meters into two categories: mass flow meters and volumetric flow meters.

Of course, it can also be divided according to the measurement medium. There are two types of flow meters for measuring gas and measuring liquid.

Perhaps, we can also divide into closed pipeline measurement and open channel measurement according to the situation of the pipeline.

Finally, we may also be able to divide into contact and non-contact measurements according to the contact situation of the medium.

Non-invasive flow meter is also known as non-contact flow meter. When measuring the fluid flow of the pipeline, there is no need to cut and open the pipeline. easy to use.

If the flowmeter is divided into 5 categories. Then the five commonly used flowmeters are:

Electromagnetic flowmeter
Differential pressure flowmeter
Turbine flowmeter
Ultrasonic flowmeter
Volumetric flowmeter (PD)

Extended reading: How to choose a high viscosity flow meter?

Sino-Inst is Manufacturer of Non Contact Flow Meters. We supply more than 20 kinds of Non Contact Flow Meters. 90% ultrasonic flowmeters, and other types of flowmeters.

Non Contact Flow Meters are mainly used for flow measurement of various liquids.
It can measure even liquids such as water, seawater, oil, and slurry.

Non Contact Flow Meters enable stable flow measurement without piping modifications. This greatly meets the measurement needs of many applications. Can be used from small to large tubes. For efficient non-contact flow measurement of flexible and rigid plastic pipes.

Sino-Inst’s Non Contact 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 non-contact flow sensor, level sensor, or other device, give us a call.

Request a Quote

Please enable JavaScript in your browser to submit the form

KimGuo11

drurylandetheatre.com

What Is Resistive Pressure Transducer?

Posted on August 4, 2022 by KimGuo11

What Is Resistive Pressure Transducer?

Resistive pressure transducers are also called resistance pressure transducers. It is a commonly used pressure sensor. Pressure sensors are generally distinguished by principle: capacitive pressure transmitters, resistive pressure transducers, inductive pressure transmitters, semiconductor pressure transmitters, and pressure transmitters for high-frequency measurement. Among them, resistance pressure transmitters are commonly used.
Resistance strain pressure sensor is a kind of resistance pressure sensor. It measures the pressure value by the resistance change of the strain gauges bonded to the elastic element.

RFQ Pressure Sensors

Resistive Pressure Transducer Working Principle

The functional principle of a resistive pressure transducer is very simple. A pressure sensor converts a mechanical pressure value into a proportional electrical signal. Pressure sensors usually consist of a body and a (thin) diaphragm.

The electrical components of resistance pressure transmitters that feel pressure are generally resistance strain gauges. Resistance strain gauges are sensitive devices that convert the pressure on the measured component into an electrical signal.

The diaphragm is the most important element for pressure measurement and is equipped with strain-sensitive and piezoresistive structures, so-called strain gauges. The diaphragm deflects under pressure.

The most widely used resistance strain gauges are metal resistance strain gauges and semiconductor strain gauges. There are two types of metal resistance strain gauges: filamentary strain gauges and metal foil strain gauges.

Usually, the strain gauge is tightly bonded to the matrix that generates mechanical strain through a special adhesive. When the stress of the matrix changes, the resistance strain gauge also deforms together, which changes the resistance value of the strain gauge. The voltage across the resistor changes.

For example, if a resistor is connected to a Wheatstone measurement bridge, an electrical signal can be measured and transmitted to the indicator.

Extended reading: High accuracy pressure transducers

Types of Pressure Transducers

Let’s talk about the classification of transmitters:

According to the working principle of the sensor, it can be divided into resistance, capacitance, inductance, semiconductor, etc.;
According to the classification of sensor chips, it can be divided into metal, ceramic, diffused silicon, sapphire, etc.;
According to the measurement range, it can be divided into differential pressure, gauge pressure, absolute pressure, high static pressure and differential pressure, etc.;

Resistive pressure transducers are the most widely used transmitters and have the advantages of high cost performance and good linearity characteristics.

Extended Reading: 4 wire pressure sensor wiring diagram

Types of Resistance Pressure Transducers

Resistive pressure transducers are generally divided into metal, ceramic, and diffused silicon according to pressure-sensitive components.

The difference between the three:

The metal pressure transmitter has poor accuracy, but the temperature effect is small, and it is suitable for fields with a wide temperature range and low accuracy requirements.
The accuracy of ceramic pressure sensors is better, but it is greatly affected by temperature. Another advantage of ceramics is impact resistance and corrosion resistance.
Diffusion silicon pressure transmitter has high precision and large temperature drift, so it is generally necessary to perform temperature compensation before it can be used. And even after temperature compensation, pressures above 125°C cannot be measured. However, under normal temperature conditions, the sensitivity coefficient of diffused silicon is 5 times that of ceramics. Therefore, it is generally used in the field of high-precision measurement, but the accuracy is low in the micro-range.

Extended Reading: Smart pressure transmitter

Piezoresistive pressure sensor refers to a sensor made by using the piezoresistive effect of single crystal silicon material and integrated circuit technology.

After the single crystal silicon material is subjected to the force, the resistivity changes, and the electrical signal output proportional to the force change can be obtained through the measurement circuit.

It is also known as a diffused silicon piezoresistive pressure sensor. It is different from the adhesive strain gauge, which needs to indirectly feel the external force through the elastic sensitive element, but directly feels the measured pressure through the silicon diaphragm.

Capacitive pressure transducer (capacitive type pressure transducer) is a pressure sensor that uses capacitive sensing elements to convert the measured pressure into an electrical output that has a certain relationship with it. The characteristics are that the input energy is low, the dynamic response is high, the natural effect is small, and the environmental adaptability is good.

It generally uses a circular metal film or a metal-plated film as an electrode of the capacitor. When the film is deformed by pressure, the capacitance formed between the film and the fixed electrode changes. By measuring the circuit, the output voltage has a certain relationship with the voltage. electric signal.

Capacitive pressure sensors belong to the polar distance variable capacitive sensors, which can be divided into single capacitive pressure sensors and differential capacitive pressure sensors.

Extended Reading: MEMS Pressure Sensors

The differential pressure transmitter is a transmitter that measures the pressure difference between the two ends of the transmitter, and outputs a standard signal (such as 4~20mA, 0~5V).

Differential pressure transmitters are different from general pressure transmitters in that they have 2 pressure interfaces. Differential pressure transmitters are generally divided into positive pressure ends and negative pressure ends.

In general, the pressure at the positive pressure end of the differential pressure transmitter should be greater than the pressure at the negative pressure section to measure.

The differential pressure transmitter is used to prevent the medium in the pipeline from directly entering the transmitter, and the pressure-sensitive diaphragm and the transmitter are connected by a capillary filled with fluid.

It is used to measure the liquid level, flow and pressure of liquid, gas or steam. Then convert it into 4～20mA DC signal output.

Featured DP transmitters.

Potentiometric pressure transducers are usually used for displacement, level and angle measurement.

The measured component is connected to the rotating shaft (or sliding arm) of the potentiometer through a certain mechanical transmission part. When the measured change changes, the sliding arm moves, and the resistance from the center of the potentiometer to the two fixed ends changes differentially.

The resistance change of the potentiometer can be converted into a voltage change output through a voltage divider circuit or a bridge circuit, and after A/D conversion, the measured physical quantity can be accurately measured. !

The hydraulic pressure transducer is mainly used in the pressure measurement of industrial equipment such as construction machinery, special equipment, compressors, injection molding machines, and servo equipment. It has good waterproof, small size and high cost performance. It is easy to install. The whole structure is made of stainless steel, which has good sealing, vibration resistance and stable and reliable performance.

Hydraulic pressure transducer is the extension and development of pressure transmitter technology. According to the principle that the pressure generated by different specific gravity liquids at different heights is linear. Realize the accurate measurement of the volume, liquid height and weight of water, oil and paste. Measure and transmit.

Extended Reading: Liquid pressure sensor

Our pressure transmitters can also be upgraded to Low power-battery powered Wireless Pressure Sensors.

Strain Gauge Pressure Transducer Working Principle

The strain gauge pressure transducer works based on the principle of resistance strain effect.

There are two types of resistance strain gauges: metal strain gauges (wire or metal foil) and semiconductor strain gauges. The measured pressure strains the strain gauge.

When the strain gauge produces compressive strain, its resistance decreases. When the strain gauge produces tensile strain, its resistance increases.

The resistance value of the strain gauge changes, and then the corresponding millivolt-level potential output is obtained through the bridge circuit. The measured pressure is displayed by a millivoltmeter or other recording instruments. Thus, a strain gauge pressure gauge is formed.

Strain gauge structure: It consists of three parts: strain sensitive element, substrate and cover layer, and lead wire. Strain-sensitive elements are generally composed of metal wires and metal foils (high resistivity materials), which convert mechanical strain into changes in resistance. The substrate and cover layer serve to fix and protect sensitive components, transmit strain and electrically insulate.

Resistance strain pressure sensor structure: diaphragm type, cylinder type, combined type. Among them, the diaphragm type is suitable for low pressure measurement; the cylinder type is suitable for high pressure measurement.

The working mode of the resistance strain pressure sensor: the change of resistance is converted into the output of current or voltage signal through the unbalanced bridge.

Featured Air pressure transducer

**SI-300 Pressure Transducer 4-20mA/Voltage**

**SI-390 Industrial Pressure Transmitter**

SI-512H High Temperature Pressure Sensor

Featured Digital pressure transducer

**Diffused silicon Gauge Pressure Transmitter**

**Capacitive Gauge Pressure Transmitter**

**Hygienic / Sanitary Pressure Transmitter**

Frequently
Asked
Questions

Help Center

Classification of working principle of pressure sensor

Piezoresistive pressure sensor
Ceramic pressure sensor
Diffusion silicon pressure sensor:
Sapphire pressure sensor:
Piezoelectric pressure sensor:

Extended reading: Pressure Sensor Applications-Featured Industry Applications

Using a multimeter to test the pressure sensor can only perform simple tests, and the test results are only for reference.
There are roughly three tests that can be performed:

Bridge detection:
It mainly detects whether the circuit of the sensor is correct. Generally, it is a Wheatstone full-bridge circuit, which uses the ohm gear of the multimeter to measure the impedance between the input terminals and the impedance between the output terminals. These two impedances are the input and output of the pressure sensor. impedance. If the impedance is infinite, the bridge is disconnected. It means that there is a problem with the sensor or the definition of the pin is not correctly judged;

Detection of zero point:
Use the voltage range of the multimeter to detect the zero output of the sensor without applying pressure. This output is generally a mV level voltage. If it exceeds the technical specifications of the sensor, it means that the zero point deviation of the sensor is out of range;

Pressure detection:
The method of checking the order is: supply power to the sensor, blow the air guide hole of the pressure sensor with the mouth, and use the voltage range of the multimeter to detect the voltage change at the output end of the sensor. If the relative sensitivity of the pressure sensor is large, this amount of change will be significant. If there is no change at all, you will need to switch to an air pressure source to apply pressure.

These types of sensors are also called pressure transmitters. Because 4-20mA signals are least affected by electrical noise and resistance in the signal line, these sensors are best used when signals must be transmitted over long distances. These sensors are typically used in applications where the lead must be 1000 feet or more.

Read more about: What Is 0-10V Signal Output?

Featured High Accuracy Pressure Transducers for Sale

What is the accuracy of a pressure transmitter?

The working principle of the pressure transmitter:

Factors affecting the overall accuracy of pressure transmitters

pressure transducer 4-20mA

Frequently Asked Questions

Which is the best pressure sensor?

What is high pressure sensor?

What are the two different types of pressure sensors?

Which pressure transducer is useful for high pressure measurement?

What is the difference between pressure sensor and pressure transducer

More Pressure Measurement Solutions

Main parameters of Flat Pressure Sensor

Principle of Flat Pressure Sensor

Application of Flat Pressure Sensor

More Featured Pressure Transmitters

Frequently Asked Questions

How Does A Pressure Sensor Transducer Work?

What Is a Fluid Pressure Sensor?

How many types of pressure sensors are there?

More Liquid and Gas Pressure Measurement Solutions

What is non contact flow meter?

Featured Non Contact Flow Meters

Types of Non Contact Flow Meters

non contact ultrasonic flow meter

non contact radar flow meter

Strap on Flow Meter for Small Pipes Φ9.53~Φ90

More Featured Liquid Flow Meters

Non Contact Liquid Measurement Solutions

Gas and Liquid Measurement Solutions

Frequently Asked Questions

What are the two types of flow meters?

What is a non invasive flow meter?

What are the five 5 types of flow meters?

What Is Resistive Pressure Transducer?

Resistive Pressure Transducer Working Principle

Types of Pressure Transducers

Types of Resistance Pressure Transducers

piezoresistive pressure transducer

capacitive pressure transducer

differential pressure transducer

potentiometric pressure transducer

hydraulic pressure transducer

Strain Gauge Pressure Transducer Working Principle

Featured Air pressure transducer

Featured Digital pressure transducer

Frequently Asked Questions

What are different types of pressure transducer?

How do you test a pressure transducer with a multimeter?

How does a 4-20mA pressure transducer work?

Related Pressure Measurement Solutions

Frequently
Asked
Questions

Frequently
Asked
Questions

Frequently
Asked
Questions

Frequently
Asked
Questions