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. 317-443
Mfr. Part No.6753-0002
BrandHerga
£28.55
Each
Units
- - 0.072psi ±2.5 % - Air - - - Spade Terminal - - - 250 V ac
RS Stock No. 397-1191
Mfr. Part No.6101-0013
BrandHerga
£35.57
Each
Units
Differential 0.7bar 16bar - Relay Fluid - - - - - - 5 A 250 V ac
RS Stock No. 511-7355
Mfr. Part No.6101-0028
BrandHerga
£24.74
Each
Units
Differential 0.37mbar 1.24mbar - - Air - - - - - - - 125 V ac
RS Stock No. 317-948
Mfr. Part No.6761-0013
BrandHerga
£8.15
Each
Units
Differential - 0.9psi - - - - - - Spade Terminal - - - 250 V ac
RS Stock No. 397-2324
Mfr. Part No.6101-0004
BrandHerga
£32.31
Each
Units
Differential 0.07bar 2.75bar - Relay Fluid - - - - - - 5 A 250 V ac
RS Stock No. 511-7361
Mfr. Part No.6101-0029
BrandHerga
£29.46
Each
Units
Differential 0.87mbar 1.61mbar - - Air - - - - - - - 125 V ac
RS Stock No. 259-6654
Mfr. Part No.6742-0038
BrandHerga
£28.63
Each
Units
- 3psi 5.5psi - Relay - - - - Spade Terminal - - - 250 V ac
RS Stock No. 259-6632
Mfr. Part No.6721-0021
BrandHerga
£23.22
Each
Units
- -270in wg -75in wg - Relay - - - - Spade Terminal - - - 250 V ac
RS Stock No. 397-1113
Mfr. Part No.6101-0002
BrandHerga
£24.76
Each
Units
Differential 62.5mbar 500mbar - Relay Fluid - - - - - - 20 mA 250 V ac
RS Stock No. 397-1107
Mfr. Part No.6101-0001
BrandHerga
£24.76
Each
Units
Differential 25mbar 75mbar - Relay Fluid - - - - - - 40 mA 30 V ac/dc
RS Stock No. 397-2330
Mfr. Part No.6101-0008
BrandHerga
£32.31
Each
Units
Differential 0.07bar 2.75bar - Relay Fluid - - - - - - 5 A 250 V ac
RS Stock No. 397-1179
Mfr. Part No.6101-0012
BrandHerga
£38.61
Each
Units
Differential 0.07bar 2.75bar - Relay Fluid - - - - - - 5 A 250 V ac
RS Stock No. 511-7377
Mfr. Part No.6101-0030
BrandHerga
£34.01
Each
Units
Differential 1.61mbar 2.86mbar - - Air - - - - - - - 125 V ac
RS Stock No. 397-1135
Mfr. Part No.6101-0005
BrandHerga
£24.34
Each
Units
Differential 25mbar 125mbar - Relay Fluid - - - - - - 20 mA 250 V ac
RS Stock No. 259-6660
Mfr. Part No.6742-0037
BrandHerga
£24.53
Each
Units
- 8psi 18psi - Relay - - - - Spade Terminal - - - 250 V ac
RS Stock No. 313-7026
Mfr. Part No.6742-0039
BrandHerga
£31.41
Each
Units
- 16psi 30psi - Relay - - - - Spade Terminal - - - 250 V ac
RS Stock No. 397-1129
Mfr. Part No.6101-0003
BrandHerga
£24.76
Each
Units
Differential 0.25bar 1.35bar - Relay Fluid - - - - - - 20 mA 250 V ac
RS Stock No. 313-6994
Mfr. Part No.6731-0028
BrandHerga
£21.92
Each
Units
- 0.05psi 0.25psi - Relay - - - - Spade Terminal - - - 250 V ac
RS Stock No. 259-6648
Mfr. Part No.6731-0026
BrandHerga
£21.59
Each
Units
- 0.08psi 0.9psi 10 % Relay - - - - Spade Terminal - - - 250 V ac
RS Stock No. 511-7383
Mfr. Part No.6101-0031
BrandHerga
£26.45
Each
Units
Differential 2.61mbar 3.73mbar - - Air - - - - - - - 125 V ac