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. 123-6665
Mfr. Part No.X5072-TB-A1-CA-H1-PA 250, mbar G
BrandDruck
£347.00
Each
Units
Gauge - 250mbar ±0.2 % Analogue Fluid RSCAL G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 609-7088
Mfr. Part No.XMPE12C2131
£43.00
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. 835-3894
Mfr. Part No.PT5404
£103.32
Each
Units
Relative 0bar 10bar ±0.5 % Analogue Gas, Liquid - G1/4 4 → 20 mA M12 Connector - 1 ms - 8.5 → 36 V dc
RS Stock No. 324-0964
Mfr. Part No.XMLA160D2S11
£144.00
Each
Units
Differential 10bar 160bar 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. 748-4717
Mfr. Part No.ISE40A-01-R
BrandSMC
£107.16
Each
Units
Vacuum -0.1MPa 1MPa ±0.2 % Analogue Gas - BSP 1/8 1 → 5 V, 4 → 20 mA Wire Lead - 2.5 ms 45 mA 12 → 24 V dc
RS Stock No. 374-8755
Mfr. Part No.787261
BrandBurkert
£22.73
Each
Units
Differential 1bar 10bar - Relay Air, Hydraulic Fluid, Oil Emulsion, Water - G1/4 - Spade Terminal - - - -
RS Stock No. 448-8101
Mfr. Part No.0184458031-SS
BrandSuco
£86.39
Each
Units
- 1bar 10bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine - G1/4 - DIN 43650 Type A - - 4 A 250 V
RS Stock No. 739-6715
Mfr. Part No.PK7520
£168.95
Each
Units
Relative 0bar 400bar <±2.5 % 2NO Gas, Liquid - G1/4 - M12 Connector - - 500 mA 9.6 → 32 V dc
RS Stock No. 235-5863
Mfr. Part No.24PCFFM6G
BrandHoneywell
£28.49
Each
Units
Gauge 0psi 100psi 0.2 % Unamplified Nitrogen Gas, Oxygen, Water - - 156 → 294 mV Solder Tag - 1 ms - 10 V dc
RS Stock No. 302-5838
Mfr. Part No.XMLA010A2S11
£131.00
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. 455-4781
Mfr. Part No.3100B0250S01E000
£94.00
Each
Units
Relative 0bar 250bar 0.25 % Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil - G1/4 4 → 20 mA M12 Connector - 1 ms - 8 → 30 V dc
RS Stock No. 748-4723
Mfr. Part No.ZSE40AF-01-R
BrandSMC
£142.29
Each
Units
Vacuum -100kPa 100kPa ±0.2 % Analogue Gas - BSP 1/8 1 → 5 V, 4 → 20 mA Wire Lead - 2.5 ms 45 mA 12 → 24 V dc
RS Stock No. 835-3882
Mfr. Part No.PT5402
£103.32
Each
Units
Relative 0bar 100bar ±0.5 % Analogue Gas, Liquid - G1/4 4 → 20 mA M12 Connector - 1 ms - 8.5 → 36 V dc
RS Stock No. 455-4523
Mfr. Part No.22ISBGA2500ABUA001
£223.00
Each
Units
Relative 0bar 2.5bar 0.25 % Analogue Gas, Petrochemical, Sewage - G1/4 4 → 20 mA DIN 43650 Type A - - - 7 → 35 V dc
RS Stock No. 124-2134
Mfr. Part No.XMLP006GD11F
£95.00
Each
Units
- 0bar 6bar ±0.1 (Repeat) %, ±0.5 (Measurement) % Analogue Air, Fresh Water, Gas, Hydraulic Oil - G1/4 0.5 → 4.5 V M12 4-Pin Connector - ≤2 ms <5 mA 5 V dc
RS Stock No. 181-1362
Mfr. Part No.24PCCFA2G
BrandHoneywell
£27.14
Each
Units
Relative 0psi 15psi 0.2 % Wheatstone Bridge Nitrogen Gas, Oxygen, Water - - 0 → 225 mV Solder Tag - 1 ms - 2.5 → 12 V dc
RS Stock No. 123-6680
Mfr. Part No.X5072-TB-A1-CA-H1-PA 6.0 bar G
BrandDruck
£286.34
Each
Units
Gauge - 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. 746-3467
Mfr. Part No.X5072-TB-A1-CA-H1-PA 6.0 bar G
BrandDruck
£198.00
Each
Units
Relative - 6bar ±0.2 % Analogue Fluid - G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 774-4104
Mfr. Part No.SDP610-500Pa
BrandSensirion
£30.12
Each
Units
Differential -500Pa 500Pa 3 % I2C Air, Non-Aggressive Gas - - - 4 Pin SMD Connector - 4.6 ms 6 mA 2.7 → 3.3 V dc
RS Stock No. 124-2173
Mfr. Part No.XMPA12C2131C
£31.35
Each
Units
Differential 0.3 (Falling) bar, 1.3 (Rising) bar 10.3 (Falling) bar, 12 (Rising) bar <3.5 (Repeat) % 3NC Air, Fresh Water, Sea Water - G1/4 - Screw Clamp - - - -