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. 124-2171
Mfr. Part No.XMPA12B2142
£37.05
Each
Units
Differential 0.3 (Falling) bar, 1.3 (Rising) bar 10.3 (Falling) bar, 12 (Rising) bar <3.5 (Repeat) % 2NC Air, Fresh Water, Sea Water - G1/4 - Screw Clamp - - - -
RS Stock No. 324-0986
Mfr. Part No.XMLA300D2S11
£151.00
Each
Units
Differential 20bar 300bar 2 % Relay Hydraulic Fluid - G1/4 - PG13.5 Cable Gland - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc
RS Stock No. 795-4711
Mfr. Part No.3100R0010G01B000
£96.50
Each
Units
Relative 0bar 10bar ±0.25 % Voltage Fluid, Gas - G1/4 0 → 5 V DIN 43650 Type A - 1 ms 4.5 mA 7 → 30 V dc
RS Stock No. 746-3650
Mfr. Part No.X5072-TB-A2-CA-H1-PA 100 bar SG
BrandDruck
£256.00
Each
Units
Relative - 100bar ±0.1 % Analogue Fluid - G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 779-4254
Mfr. Part No.211215-RS
£59.00
Each
Units
- 65psi 300psi - SPDT Air, Hydraulic - BSP 1/4 - Screw Terminals - - 5 A 125/250 V
RS Stock No. 399-1628
Mfr. Part No.XMAV12L2135
£72.00
Each
Units
Differential 1.3bar 12bar 3.5 % Relay Air, Fresh Water, Sea Water - G1/4 - Screw Terminals - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc
RS Stock No. 398-6991
Mfr. Part No.0184458031042
BrandSuco
£48.14
Each
Units
- 1bar 10bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine - G1/4 - DIN 43650 Type A - - 4 A 250 V
RS Stock No. 397-1191
Mfr. Part No.6101-0013
BrandHerga
£37.01
Each
Units
Differential 0.7bar 16bar - Relay Fluid - - - - - - 5 A 250 V ac
RS Stock No. 313-5351
Mfr. Part No.14X1HA1GV1
BrandVega
£191.60
Each
Units
Relative 0bar 25bar 0.3 % - Fluid, Gas, Vapour - G1/2 4 → 20 mA DIN 43650 Type A - - - 12 → 36 V dc
RS Stock No. 613-7710
Mfr. Part No.404366/000-464-405-504-20-61/000
BrandJumo
£248.39
Each
Units
Relative 0bar 100bar - - Fluid, Gas - G1/2 4 → 20 mA DIN 43650 Type A - - - 10 → 30 V dc
RS Stock No. 424-5768
Mfr. Part No.404366/000-464-405-504-20-61/000
BrandJumo
£260.45
Each
Units
Relative 0bar 100bar 0.2 % Analogue Fluid, Gas - G1/2 4 → 20 mA DIN 43650 Type A - - - 10 → 30 V dc
RS Stock No. 511-7355
Mfr. Part No.6101-0028
BrandHerga
£25.74
Each
Units
Differential 0.37mbar 1.24mbar - - Air - - - - - - - 125 V ac
RS Stock No. 235-5835
Mfr. Part No.24PCCFA6D
BrandHoneywell
£27.14
Each
Units
Differential 0psi 15psi 0.2 % Unamplified Nitrogen Gas, Oxygen, Water - - 165 → 285 mV Solder Tag - 1 ms - 10 V dc
RS Stock No. 235-5885
Mfr. Part No.24PCFFA6D
BrandHoneywell
£20.72
Each
Units
Differential 0psi 100psi 0.2 % Unamplified Nitrogen Gas, Oxygen, Water - - 156 → 294 mV Solder Tag - 1 ms - 10 V dc
RS Stock No. 836-9032
Mfr. Part No.ADP51B62
BrandPanasonic
£16.16
Each
Units
Relative - - ±2.5 % Amplified Air - - 4 V PCB - - 10 mA -
RS Stock No. 169-8092
Mfr. Part No.ADP51B62
BrandPanasonic
£10.336
Each (In a Tube of 100)
Units
Relative - - ±2.5 % Amplified Air - - 4 V PCB - - 10 mA -
RS Stock No. 398-7039
Mfr. Part No.0166403031011
BrandSuco
£23.95
Each
Units
- 0.1bar 1bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine - G1/4 - Spade Terminal - - - 42 V
RS Stock No. 398-7051
Mfr. Part No.0166411031043
BrandSuco
£23.95
Each
Units
- 10bar 20bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine - G1/4 - Spade Terminal - - - 42 V
RS Stock No. 739-6724
Mfr. Part No.PK7521
£164.22
Each
Units
Relative 0bar 250bar <±2.5 % 2NO Gas, Liquid - G1/4 - M12 Connector - - 500 mA 9.6 → 32 V dc
RS Stock No. 286-664
Mfr. Part No.26PCCFA6G
BrandHoneywell
£29.34
Each
Units
Gauge 0psi 15psi ±0.25 % Unamplified Nitrogen Gas, Oxygen - - 97 → 103 mV PCB - 1 ms - 10 V dc