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. 779-4257
Mfr. Part No.209957-RS
£59.00
Each
Units
- 10psi 30psi - SPDT Air, Hydraulic - NPT 1/4 - Screw Terminals - - 5 A 125/250 V
RS Stock No. 914-8322
Mfr. Part No.DP-101A-M-P
BrandPanasonic
£136.25
Each
Units
Relative -1bar 10bar - PNP Non-Corrosive Gas - G1/8 1 → 5 V dc, 4 → 20 mA Wire Lead - 5000 ms 100 mA 12 → 24 V dc
RS Stock No. 235-5829
Mfr. Part No.24PCCFA6G
BrandHoneywell
£17.16
Each
Units
Gauge 0psi 15psi 0.2 % Unamplified Nitrogen Gas, Oxygen, Water - - 165 → 285 mV Solder Tag - 1 ms - 10 V dc
RS Stock No. 719-1080
Mfr. Part No.MPX5010DP
BrandNXP
£12.68
Each
Units
- - - ±5 % - - - - - - - - - -
RS Stock No. 124-2126
Mfr. Part No.9013FSG2J21
BrandSquare D
£24.36
Each
Units
Differential 15 (Approximate) psi, 20 (Rising) psi 30 (Approximate) psi, 65 (Rising) psi ±3 (Repeat) % 2NC Fresh Water - 0.25 in NPSF - Screw Clamp - - - -
RS Stock No. 922-7324
Mfr. Part No.MPX5010DP
BrandNXP
£9.049
Each (In a Tray of 20)
Units
Differential 0bar 10kPa ±5 % Analogue Air, Fluid - - 4.7 V PCB Mount - 1 ms - 4.75 → 5.25 V dc
RS Stock No. 302-5844
Mfr. Part No.XMLA020A2S11
£131.10
Each
Units
Differential 1bar 20bar 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. 455-4646
Mfr. Part No.3100B0025G01B000
£96.50
Each
Units
- 0bar 25bar 0.25 % - Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil - G1/4 4 → 20 mA DIN 43650 Type C - - - 10 → 36 V dc
RS Stock No. 235-5807
Mfr. Part No.24PCBFA6G
BrandHoneywell
£27.14
Each
Units
Gauge 0psi 5psi 0.2 % Unamplified Nitrogen Gas, Oxygen, Water - - 85 → 145 mV Solder Tag - 1 ms - 10 V dc
RS Stock No. 779-4250
Mfr. Part No.212344-RS
£59.00
Each
Units
- 25psi 75psi - SPDT Air, Hydraulic - NPT 1/4 - Screw Terminals - - 5 A 125/250 V
RS Stock No. 746-3672
Mfr. Part No.X5072-TB-A2-CA-H1-PA 0.8 to 1.2 bar B
BrandDruck
£256.00
Each
Units
Absolute 0.8bar 1.2bar ±0.1 % Analogue Fluid - G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 313-5301
Mfr. Part No.14X1SA1GV1
BrandVega
£191.60
Each
Units
Relative 0bar 0.1bar 0.3 % - Fluid, Gas, Vapour - G1/2 4 → 20 mA DIN 43650 Type A - - - 12 → 36 V dc
RS Stock No. 455-4551
Mfr. Part No.22ISBGB1000ABUA001
£223.00
Each
Units
Relative 0bar 10bar 0.25 % Analogue Fluid, Gas - G1/4 4 → 20 mA DIN 43650 Type A - - - 7 → 35 V dc
RS Stock No. 609-6934
Mfr. Part No.XMLA035A2S11
£125.00
Each
Units
Differential 1.5bar 35bar 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. 177-5943
Mfr. Part No.SCX01DN
BrandHoneywell
£137.026
Each (In a Box of 25)
Units
Differential 0psi 1psi ±1 % Wheatstone Bridge Pneumatic Fluid - - 0 → 18 mV Solder Tag - 100 μs - 20 V dc
RS Stock No. 455-5065
Mfr. Part No.SCX01DN
BrandHoneywell
£154.38
Each
Units
Differential 0psi 1psi ±0.1 % Unamplified Pneumatic Fluid - - 17.82 → 18.18 mV Solder Tag - 100 ms - 20 V dc
RS Stock No. 313-5317
Mfr. Part No.14X1AA1GV1
BrandVega
£191.60
Each
Units
Relative 0bar 1bar 0.3 % - Fluid, Gas, Vapour - G1/2 4 → 20 mA DIN 43650 Type A - - - 12 → 36 V dc
RS Stock No. 719-1043
Mfr. Part No.MPX2202A
BrandNXP
£13.37
Each
Units
Absolute 0bar 200kPa ±1 % - Air - - 38.5 → 41.5 mV PCB Mount - 1 ms - 10 V dc
RS Stock No. 169-0627
Mfr. Part No.MPX2202A
BrandNXP
£9.93
Each (In a Tray of 25)
Units
Absolute 0bar 200kPa ±1 % - Air - - 38.5 → 41.5 mV PCB Mount - 1 ms - 10 V dc
RS Stock No. 896-8430
Mfr. Part No.3500B0001G01E000
£94.00
Each
Units
Relative - 1bar 0.25 % Current Air, Gas, Water - G1/4 4 → 20 mA M12 Connector - - - 10 → 30 V dc