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. 752-2465
Mfr. Part No.9012GCW3
BrandSquare D
£306.12
Each
Units
Differential 289psi 1260psi ±0.1 → 1 % - Gas, Liquid Level - NPT 1/4 - 12" NPT - - 10 A 600 V
RS Stock No. 609-7050
Mfr. Part No.XMLB500D2S11
£191.00
Each
Units
Differential 7bar 447.4bar 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. 463-5593
Mfr. Part No.404366/000-451-405-504-20-61/000
BrandJumo
£291.01
Each
Units
Relative 0bar 0.25bar 0.2 % Analogue Fluid, Gas - G1/2 4 → 20 mA DIN 43650 Type A - - - 10 → 30 V dc
RS Stock No. 922-7333
Mfr. Part No.MPX5010GP
BrandNXP
£11.365
Each (In a Tray of 20)
Units
Relative 0bar 10kPa ±5 % Analogue Air, Fluid - - 4.7 V PCB Mount - 1 ms - 4.75 → 5.25 V dc
RS Stock No. 896-8471
Mfr. Part No.3500B02B5A01B000
£118.00
Each
Units
Absolute - 2.5bar 0.25 % Current Air, Gas, Water - G1/4 4 → 20 mA DIN 43650 Type C - - - 10 → 30 V dc
RS Stock No. 423-3670
Mfr. Part No.404366/000-454-405-504-20-61/000
BrandJumo
£260.45
Each
Units
Relative 0bar 1bar 0.2 % - Fluid, Gas - G1/2 4 → 20 mA DIN 43650 Type A - - - 10 → 30 V dc
RS Stock No. 609-6928
Mfr. Part No.XMLA010A2C11
£141.00
Each
Units
Differential 0.6bar 10bar 2 % Relay Air, Fresh Water, Hydraulic Fluid, Sea Water - G1/4 - PG13.5 Cable Gland - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc
RS Stock No. 374-8777
Mfr. Part No.787264
BrandBurkert
£30.46
Each
Units
Differential 50bar 200bar - Relay Air, Hydraulic Fluid, Oil Emulsion, Water - G1/4 - Spade Terminal - - - -
RS Stock No. 797-0959
Mfr. Part No.31ISB0060G01R000
£114.10
Each
Units
Relative 0bar 60bar 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. 795-4755
Mfr. Part No.3100B0400S05G000
£102.00
Each
Units
Relative 0bar 400bar ±0.25 % Current Fluid, Gas - G1/4 4 → 20 mA DIN 43650 Type A - 1 ms 20 mA 8 → 30 V dc
RS Stock No. 835-3885
Mfr. Part No.PT5400
£105.55
Each
Units
Relative 0bar 400bar ±0.5 % Analogue Gas, Liquid - G1/4 4 → 20 mA M12 Connector - 1 ms - 8.5 → 36 V dc
RS Stock No. 511-7399
Mfr. Part No.6101-0032
BrandHerga
£27.62
Each
Units
Differential 3.73mbar 4.98mbar - - Air - - - - - - - 125 V ac
RS Stock No. 487-955
Mfr. Part No.PK7522
£162.12
Each
Units
Relative 0bar 100bar ±2.5 % Relay Fluid, Gas - G1/4 - M12 Connector - - 500 mA 9.6 → 32 V dc
RS Stock No. 124-1468
Mfr. Part No.46879225
BrandWIKA
£98.53
Each
Units
- 0bar 10bar 0.5 % Analogue Gas, Liquid - G1/4 0 → 5 V DIN 175301-803 C - < 4 ms - 8 → 30 V dc
RS Stock No. 922-7368
Mfr. Part No.MPXA4250AC6U
BrandNXP
£11.751
Each (In a Tube of 40)
Units
Absolute 20kPa 250kPa ±1.5 % Analogue Air - - 4.9 V PCB Mount - 1 ms - 4.85 → 5.35 V dc
RS Stock No. 167-0469
Mfr. Part No.B58611K1100A003
BrandEPCOS
£32.909
Each (In a Box of 40)
Units
Relative 0bar 0.1bar ±1 % - Fluid, Gas - - - PCB Mount - - - 10 V
RS Stock No. 430-9878
Mfr. Part No.401001/000-458-405-502-20-601-61/000
BrandJumo
£153.92
Each
Units
Relative 0bar 6bar 0.5 % - Fluid, Gas - G1/4 4 → 20 mA DIN 43650 Type A - 3 ms - 10 → 30 V dc
RS Stock No. 831-5710
Mfr. Part No.PX2AN2XX250PSCHX
BrandHoneywell
£77.22
Each
Units
Relative 0psi 250psi ±0.25 % Current Air, Brake Fluid, Hydraulic Fluid, Oil, Refrigeration Fluid - NPT 1/8 4 → 20 mA Metri-Pack 150 - <2 ms - 8 → 30 V dc
RS Stock No. 748-4711
Mfr. Part No.ISE40A-C6-T
BrandSMC
£115.03
Each
Units
Vacuum -0.1MPa 1MPa ±0.2 % Analogue Gas - 6 mm Tube 1 → 5 V, 4 → 20 mA - - 2.5 ms 45 mA 12 → 24 V dc
RS Stock No. 430-9884
Mfr. Part No.401001/000-456-405-502-20-601-61/000
BrandJumo
£153.92
Each
Units
- 0bar 2.5bar - - - - G1/4 4 → 20 mA DIN 43650 Type A - - - 10 → 30 V dc