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. 779-4204
Mfr. Part No.PS61-20-4MGZ-A-SP
£24.95
Each
Units
- 40psi 150psi - SPST-NO Hydraulic - BSP 1/4 - Spade Terminal - - 100 VA 42 V dc
RS Stock No. 746-3499
Mfr. Part No.X5072-TB-A1-CA-H1-PA 250 bar SG
BrandDruck
£241.00
Each
Units
Relative - 250bar ±0.2 % Analogue Fluid - G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 317-443
Mfr. Part No.6753-0002
BrandHerga
£29.70
Each
Units
- - 0.072psi ±2.5 % - Air - - - Spade Terminal - - - 250 V ac
RS Stock No. 124-2176
Mfr. Part No.XMPC06C2374
£43.70
Each
Units
Differential 0.2 (Falling) bar, 1 (Rising) bar 4.8 (Falling) bar, 6 (Rising) bar <3.5 (Repeat) % 3NC Air, Fresh Water, Sea Water - G1/2 - Screw Clamp - - - -
RS Stock No. 797-0962
Mfr. Part No.31ISB0250S01R000
£114.10
Each
Units
Relative 0bar 250bar 0.25 % Analogue Fluid, Gas - G1/4 4 → 20 mA DIN 43650 Type C - 1 ms 4.5 mA 8 → 24 V dc
RS Stock No. 739-6721
Mfr. Part No.PK7524
£164.22
Each
Units
Relative 0bar 10bar <±2.5 % PNP-2NO Gas, Liquid - G1/4 - M12 Connector - - 500 mA 9.6 → 32 V dc
RS Stock No. 123-6656
Mfr. Part No.X5072-TB-A1-CA-H1-PA 10.0 bar G
BrandDruck
£282.00
Each
Units
Gauge - 10bar ±0.2 % Analogue Fluid RSCAL G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 746-3470
Mfr. Part No.X5072-TB-A1-CA-H1-PA 10.0 bar G
BrandDruck
£198.00
Each
Units
Relative - 10bar ±0.2 % Analogue Fluid - G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 820-7035
Mfr. Part No.6742-0052
BrandHerga
£50.92
Each
Units
- 60psi 120psi ±10 % SPCO Air, Gas, Liquid, Oil - BSP 1/8 - Spade Terminal - - 21 A 220 V dc, 250 V ac
RS Stock No. 452-8883
Mfr. Part No.401001/000-459-405-502-20-601-61/000
BrandJumo
£153.92
Each
Units
Gauge 0bar 10bar ≤0.5 % Analogue Gas, Liquid - G1/4 4 → 20 mA Wire Lead - ≤3 ms - 10 → 30 V dc
RS Stock No. 199-399
Mfr. Part No.XMPA12C2131
£37.05
Each
Units
Differential 1.3bar 12bar 3.5 % - Air, Fresh Water, Sea Water - G1/4 - PG13.5 Cable Gland - - 1.5 A -
RS Stock No. 395-7101
Mfr. Part No.2600BGA1019M3HA017
£362.50
Each
Units
Relative 0bar 0.5bar 0.25 % Amplified - - - 4 → 20 mA Wire Lead - 0.5 ms 20 mA 7 → 35 V dc
RS Stock No. 609-7094
Mfr. Part No.XMPE12C2242
£50.00
Each
Units
Differential 1.3bar 12bar 3.5 % - Air, Fresh Water, Sea Water - G3/8 - PG13.5 Cable Gland - - 1.5 A -
RS Stock No. 746-3445
Mfr. Part No.X5072-TB-A1-CA-H1-PA -1 to 1.6 bar G
BrandDruck
£198.00
Each
Units
Relative -1bar 1.6bar ±0.2 % Analogue Fluid - G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 123-6683
Mfr. Part No.X5072-TB-A1-CA-H1-PA -1 to 1.6 bar G
BrandDruck
£282.00
Each
Units
Gauge -1bar 1.6bar ±0.2 % Analogue Fluid RSCAL G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 177-4880
Mfr. Part No.2SMPP-02
BrandOmron
£2.495
Each (In a Tube of 112)
Units
- - - - - - - - - - - - - -
RS Stock No. 788-4921
Mfr. Part No.2SMPP-02
BrandOmron
£2.84
Each (In a Pack of 2)
Units
Relative 0bar 37kPa - Amplified Air - - - PCB - - 130 μA -
RS Stock No. 455-4630
Mfr. Part No.3100B0016G01B000
£96.50
Each
Units
Gauge 0bar 16bar 0.25 % Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil - G1/4 4 → 20 mA DIN 43650 Type C - 1 ms - 8 → 30 V dc
RS Stock No. 399-1612
Mfr. Part No.XMAV06L2135
£73.00
Each
Units
Differential 1bar 6bar 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. 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 - - - -