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 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 - Like 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. 175-4991
BrandRS PRO
£114.20
Each
Units
Relative 0bar 16bar ±0.25 % Analogue - - G1/4 0 → 5 V M12 4-pin - - - 9 → 32 V dc
RS Stock No. 175-5045
BrandRS PRO
£114.20
Each
Units
Relative 0psi 1500psi ±0.25 % Analogue - - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc
RS Stock No. 175-5032
BrandRS PRO
£53.17
Each
Units
Relative -14.5psi 350psi ±0.25 % Analogue - - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA 9 → 32 V dc
RS Stock No. 175-4999
BrandRS PRO
£114.20
Each
Units
Relative 0bar 400bar ±0.25 % Analogue - - G1/4 4 → 20 mA M12 4-pin - - 20 mA 9 → 32 V dc
RS Stock No. 175-5023
BrandRS PRO
£210.70
Each
Units
Relative 0psi 5psi ±0.25 % Analogue - - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc
RS Stock No. 175-5027
BrandRS PRO
£204.56
Each
Units
Relative 0psi 10psi ±0.25 % Analogue - - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc
RS Stock No. 175-5011
BrandRS PRO
£165.48
Each
Units
Relative 0bar 0.25bar ±0.25 % Analogue - - G1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc
RS Stock No. 175-4990
BrandRS PRO
£114.20
Each
Units
Relative 0bar 16bar ±0.25 % Analogue - - G1/4 4 → 20 mA M12 4-pin - - 20 mA 9 → 32 V dc
RS Stock No. 175-5031
BrandRS PRO
£128.22
Each
Units
Relative -14.5psi 150psi ±0.25 % Analogue - - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc
RS Stock No. 175-5026
BrandRS PRO
£165.48
Each
Units
Relative 0psi 10psi ±0.25 % Analogue - - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA 9 → 32 V dc
RS Stock No. 175-5030
BrandRS PRO
£128.22
Each
Units
Relative -14.5psi 150psi ±0.25 % Analogue - - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA 9 → 32 V dc
RS Stock No. 123-5542
Mfr. Part No.3100B0010G01B000
£180.50
Each
Units
Gauge 0bar 10bar 0.25 % Analogue - RSCAL G1/4 4 → 20 mA DIN 43650 Type C - 1 ms - 10 → 30 V dc
RS Stock No. 455-4624
Mfr. Part No.3100B0010G01B000
£96.50
Each
Units
Gauge 0bar 10bar 0.25 % Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil - G1/4 4 → 20 mA DIN 43650 Type C - 1 ms - 10 → 30 V dc
RS Stock No. 821-3689
Mfr. Part No.83282-00000100-05
BrandHoneywell
£37.42
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 772-9907
Mfr. Part No.XMPA12B2131
£32.30
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 398-7045
Mfr. Part No.0166407031027
BrandSuco
£23.95
Each
Units
- 1bar 10bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine - G1/4 - Spade Terminal - - - 42 V
RS Stock No. 177-4881
Mfr. Part No.2SMPP-03
BrandOmron
£3.089
Each (In a Tube of 112)
Units
- - - - - - - - - - - - - -
RS Stock No. 788-4925
Mfr. Part No.2SMPP-03
BrandOmron
£5.15
Each (In a Pack of 2)
Units
Relative -50kPa 50kPa - Amplified Air - - - PCB - - 200 μA -
RS Stock No. 746-3477
Mfr. Part No.X5072-TB-A1-CA-H1-PA 16.0 bar G
BrandDruck
£198.00
Each
Units
Relative - 16bar ±0.2 % Analogue Fluid - G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 123-6659
Mfr. Part No.X5072-TB-A1-CA-H1-PA 16.0 bar G
BrandDruck
£282.00
Each
Units
Gauge - 16bar ±0.2 % Analogue Fluid RSCAL G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V