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 Series
RS Stock No. 175-5029
BrandRS PRO
£204.56
Each
Units
Relative 0psi 15psi ±0.25 % Analogue - - NPT 1/4 0 → 5 V M12 Connector - - - IPSLU
RS Stock No. 102-4143
BrandRS PRO
£398.43
Each
Units
Relative 0bar 50bar ±0.25 % Analogue Grey Water, Sewage, Viscous Fluid - G3/4 4 → 20 mA M12 4-pin - - 28 mA -
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 IPSLU
RS Stock No. 175-5050
BrandRS PRO
£141.18
Each
Units
Relative 0psi 5800psi ±0.25 % Analogue - - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA IPSU
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 IPSLU
RS Stock No. 175-5040
BrandRS PRO
£118.77
Each
Units
Relative 0psi 100psi ±0.25 % Analogue - - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA IPSU
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 - - - IPSU
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 IPS
RS Stock No. 175-5043
BrandRS PRO
£114.20
Each
Units
Relative 0psi 150psi ±0.25 % Analogue - - NPT 1/4 0 → 5 V M12 Connector - - - IPSU
RS Stock No. 175-4985
BrandRS PRO
£114.20
Each
Units
Relative 0bar 10bar ±0.25 % Analogue - - G1/4 4 → 20 mA M12 4-pin - - 20 mA IPS
RS Stock No. 175-5013
BrandRS PRO
£165.48
Each
Units
Relative 0bar 500mbar ±0.25 % Analogue - - G1/4 0 → 5 V M12 Connector - - - IPSL
RS Stock No. 175-5009
BrandRS PRO
£165.48
Each
Units
Relative 0bar 0.1bar ±0.25 % Analogue - - G1/4 0 → 5 V M12 Connector - - - IPSL
RS Stock No. 175-5020
BrandRS PRO
£165.48
Each
Units
Relative 0psi 2psi ±0.25 % Analogue - - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA IPSLU
RS Stock No. 175-5052
BrandRS PRO
£141.18
Each
Units
Relative 0psi 750psi ±0.25 % Analogue - - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA IPSU
RS Stock No. 175-5034
BrandRS PRO
£128.22
Each
Units
Relative 0psi 15psi ±0.25 % Analogue - - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA IPSU
RS Stock No. 175-5028
BrandRS PRO
£68.63
Each
Units
Relative 0psi 15psi ±0.25 % Analogue - - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA IPSLU
RS Stock No. 175-5049
BrandRS PRO
£118.77
Each
Units
Relative 0psi 3600psi ±0.25 % Analogue - - NPT 1/4 0 → 5 V M12 Connector - - - IPSU
RS Stock No. 175-5025
BrandRS PRO
£204.56
Each
Units
Relative 0psi 8psi ±0.25 % Analogue - - NPT 1/4 0 → 5 V M12 Connector - - - IPSLU
RS Stock No. 175-5042
BrandRS PRO
£114.20
Each
Units
Relative 0psi 150psi ±0.25 % Analogue - - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA IPSU
RS Stock No. 175-4984
BrandRS PRO
£133.35
Each
Units
Relative 0bar 1bar ±0.25 % Analogue - - G1/4 0 → 5 V M12 4-pin - - - IPS