Pressure Sensors

Pressure sensors are devices that sense the applied pressure of gases or liquids. The output of the measurement is then converted into an electrical signal which reflects the amount of pressure applied.


There are various different technologies used within pressure sensors. Depending on the requirements, this can influence their sensing accuracy and reliability. When the mechanical displacement within the sensor is turned into an electrical output signal there are 5 ways this can happen.


Resistive - These types of sensors use the change in electrical resistance of a strain gauge connected to the diaphragm.


Capacitive - Are highly sensitive and are able to measure low-pressure under 10 bar while still withstanding large overloads.


Piezoelectric - These sensors use substances like Quartz to generate a charge on the surface when pressure is applied. Piezoelectric pressure sensors are ideal for measuring fast changing pressures.


Optical - These use interferometry to measure pressure changes in optical fibre. They are not disturbed by EMI and can be used in noisy or medical environments.


MEMS - This stands for micro-electro-mechanical system and contains capacitive or piezo pressure sensing mechanisms on silicon at micron level resolution.


Types of Pressure Sensors


Within the sensors, there are various properties which can be used to classify them. This includes what pressure range they measure, their operating temperature range or the pressure type they measure.


Absolute Pressure Sensor - This type of sensor measures pressure relative to the perfect vacuum (zero reference point).


Gauge Pressure Sensors - These are often used to measure atmospheric pressure and are sometimes referred to as relative pressure sensors.


Sealed Gauge Pressure Sensor - Similar to a gauge pressure sensor except they measure pressure relative to a fixed pressure, not the current ambient atmospheric pressure which can vary.


Differential Pressure Sensors - These can be used to measure the difference between two different pressures (differential pressure) which can be connected to either side of the sensor. They are often used to measure pressure drops, fluid levels and flow rates.


Pressure Sensor Applications


Pressure sensors are used in many applications in a large range of industries. These include medical, aviation, automotive and marine.


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Description Price Pressure Reading Type Minimum Pressure Reading Maximum Pressure Reading Accuracy Output Type Media Measured Calibrated Process Connection Analogue Output Electrical Connection Communication Protocol Response Time Maximum Current Supply Voltage
RS Stock No. 102-4152
BrandRS PRO
£133.67
Each
Units
Absolute 0bar 10bar ±0.25 % Analogue Grey Water, Sewage, Viscous Fluid - BSP 3/4 4 → 20 mA M12 4-pin - - 28 mA 12 → 28 V dc
RS Stock No. 123-5250
BrandRS PRO
£554.15
Each
Units
Absolute 0bar 0.75bar ±0.25 % Analogue Air, Hydraulic Fluid, Liquid, Non-Aggressive Gas, Oil, Water - G1/4 0 → 5 V, 4 → 20 mA Battery - - - -
RS Stock No. 102-4147
BrandRS PRO
£297.25
Each
Units
Relative -1bar 9bar ±0.25 % Analogue Grey Water, Sewage, Viscous Fluid - BSP 3/4 4 → 20 mA M12 4-pin - - 28 mA 12 → 28 V dc
RS Stock No. 102-4155
BrandRS PRO
£277.13
Each
Units
Relative 0bar 0.25bar ±0.25 % Analogue Oil - BSP 1/4 4 → 20 mA DIN 46350 Connector - - 28 mA 9 → 32 V dc
RS Stock No. 828-5735
BrandRS PRO
£145.78
Each
Units
Relative 0bar 0.75bar <±0.25 % Voltage Oil, Water - BSP 1/4 0.5 → 4.5 V DIN 43650 Connector - - 6 mA 9 → 32 V dc
RS Stock No. 102-4141
BrandRS PRO
£291.43
Each
Units
Relative 0bar 20bar ±0.25 % Analogue Grey Water, Sewage, Viscous Fluid - BSP 3/4 4 → 20 mA M12 4-pin - - 28 mA 12 → 28 V dc
RS Stock No. 102-4161
BrandRS PRO
£172.49
Each
Units
Absolute 0bar 1bar ±0.25 % Analogue Oil - BSP 1/4 4 → 20 mA DIN 46350 Connector - - 28 mA 9 → 32 V dc
RS Stock No. 828-5779
BrandRS PRO
£161.94
Each
Units
Relative 0bar 50bar <±0.25 % Current Sewage, Viscous Fluid, Water - G3/4 4 → 20 mA M12 Connector - - 28 mA 9 → 32 V dc
RS Stock No. 102-4144
BrandRS PRO
£297.25
Each
Units
Relative 0bar 100bar ±0.25 % Analogue Grey Water, Sewage, Viscous Fluid - BSP 3/4 4 → 20 mA M12 4-pin - - 28 mA 12 → 28 V dc
RS Stock No. 175-5017
BrandRS PRO
£160.66
Each
Units
Relative 0bar 1bar ±0.25 % Analogue - - BSP 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc
RS Stock No. 175-5018
BrandRS PRO
£253.57
Each
Units
Relative 0psi 1psi ±0.25 % Analogue - - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA 9 → 32 V dc
RS Stock No. 175-5019
BrandRS PRO
£199.14
Each
Units
Relative 0psi 1psi ±0.25 % Analogue - - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc
RS Stock No. 175-5037
BrandRS PRO
£110.87
Each
Units
Relative 0psi 30psi ±0.25 % Analogue - - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc
RS Stock No. 175-5020
BrandRS PRO
£160.66
Each
Units
Relative 0psi 2psi ±0.25 % Analogue - - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA 9 → 32 V dc
RS Stock No. 175-5038
BrandRS PRO
£110.87
Each
Units
Relative 0psi 75psi ±0.25 % Analogue - - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA 9 → 32 V dc
RS Stock No. 175-5021
BrandRS PRO
£160.66
Each
Units
Relative 0psi 2psi ±0.25 % Analogue - - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc
RS Stock No. 175-5039
BrandRS PRO
£110.87
Each
Units
Relative 0psi 75psi ±0.25 % Analogue - - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc
RS Stock No. 175-5049
BrandRS PRO
£110.87
Each
Units
Relative 0psi 3600psi ±0.25 % Analogue - - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc
RS Stock No. 175-5022
BrandRS PRO
£160.66
Each
Units
Relative 0psi 5psi ±0.25 % Analogue - - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA 9 → 32 V dc
RS Stock No. 175-4992
BrandRS PRO
£110.87
Each
Units
Relative 0bar 25bar ±0.25 % Analogue - - BSP 1/4 4 → 20 mA DIN 43650 - - 20 mA 9 → 32 V dc
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