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. 176-7904
Mfr. Part No.XMLP1K0PP230
£126.00
Each
Units
- 0psi 1000psi 0.1 %, ±0.5 (Measurement) % Analogue Air, Fresh Water, Gas, Hydraulic Oil, Refrigeration Fluid - - 4 → 20 mA 3 Pin Male Connector - ≤2 ms 23 mA 12 → 24 V dc
RS Stock No. 200-6099
Mfr. Part No.325534009-50
£16.29
Each (On a Reel of 1000)
Units
- - - - - - - - - - - - - -
RS Stock No. 136-5085
Mfr. Part No.3200B0100S05ER00
£96.00
Each
Units
Relative 0bar 100bar - Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil - G1/4 4 → 20 mA 4-Pin M12 x 1 Connector - 1 ms 2 (Sink & Source) mA 8 → 30 V dc
RS Stock No. 136-5992
Mfr. Part No.836P-D2NFGA30PA-D4
£293.00
Each
Units
Relative - - ±1 % Analogue, PNP Gas, Liquid, Steam - NPT 1/4 4 → 20 mA 4-Pin M12 DC Micro Connector IO-LINK - 450 mA 15 → 35 V dc
New
RS Stock No. 210-0734
Mfr. Part No.PP20H-2.3B19R.D115.542020.000
BrandBaumer
£344.60
Each
Units
Relative -1bar 40bar ±0.5 % Current Oil - M12 - - - - - 30 V
RS Stock No. 179-9889
Mfr. Part No.XMLK010B2D71
£129.00
Each
Units
Differential - - ±1 % Analogue Fluid - G1/4 0 → 10 V M12 Male Connector - 5 ms 6 mA 24 V dc
New
RS Stock No. 206-7043
Mfr. Part No.PP - 222 2BM
BrandVega
£337.00
Each
Units
Relative -1bar 60bar 0.3 % Analogue Gas, Vapour - - - - - - - 35 V
RS Stock No. 177-8850
Mfr. Part No.XMEP250BV11F
£117.00
Each
Units
- 0bar 250bar ±0.5 % Analogue Air, Fresh Water, Hydraulic Oil - G1/4 0.5 → 4.5 V 3 Pin Male Connector AMP SUPERSEAL 1.5 - <=2 ms 7 mA 5 V dc
RS Stock No. 146-2924
Mfr. Part No.XMLP004GC71F
£104.00
Each
Units
Differential 0bar 4bar 0.1 % Analogue Air, Fresh Water, Gas, Hydraulic Oil - - 0 → 10 V 3-Pin DIN 43650 Male Connector - ≤2 ms <7 mA 24 V dc
RS Stock No. 136-5059
Mfr. Part No.3100S0160S01E000
£94.00
Each
Units
Relative 0bar 160bar 0.25 % Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil - G1/4 0 → 10 V 4-Pin M12 x 1 Connector - 1 ms 2 (Sink & Source) mA 8 → 30 V dc
RS Stock No. 136-5097
Mfr. Part No.5000BGN2000G3000A
£169.40
Each
Units
Relative 71mbar 0.2bar 0.2 % Analogue Sea Water - G1/4 4 → 20 mA DIN 43650 Type A - 5 ms - 9 → 35 V dc
RS Stock No. 146-5273
Mfr. Part No.XMLP016BC71F
£96.90
Each
Units
Differential - 48bar ±0.5 % Analogue Air, Fresh Water, Gas, Hydraulic Oil, Refrigeration Fluid - G1/4 0 → 10 V 3-Pin EN 175301-803-A Male Connector - ≤2 ms <7 mA 24 V dc
RS Stock No. 136-5997
Mfr. Part No.836P-D2NFGB20PA-D4
£293.00
Each
Units
Relative 0bar 13.78bar ±1 % Analogue, PNP Gas, Liquid, Steam - NPT 1/4 4 → 20 mA 4-Pin M12 DC Micro Connector IO-LINK - 450 mA 15 → 35 V dc
RS Stock No. 197-6898
Mfr. Part No.MPRLS0030PG0000SA
BrandHoneywell
£3.515
Each (On a Reel of 160)
Units
Gauge 0psi 30psi ±0.25 %FSS BFSL Transistor Gas, Liquid - - - - - - - 3.6 V
New
RS Stock No. 212-9078
Mfr. Part No.34D-P100G-DA1-AA
£292.31
Each
Units
Relative 0bar 100bar ?0.5 % Transistor Gas, Liquid Level - - - - - - - 30 V dc
RS Stock No. 177-8863
Mfr. Part No.XMLP2D5GD21F
£96.00
Each
Units
- 0bar 2.5bar ±0.5 % Analogue Air, Fresh Water, Gas, Hydraulic Oil - - 4 → 20 mA 4 Pin Male Connector M12 - <=2 ms 23 mA 12 → 24 V dc
RS Stock No. 177-8872
Mfr. Part No.XMLP2D5GC11F
£98.80
Each
Units
- 0bar 2.5bar ±0.5 % Analogue Air, Fresh Water, Gas, Hydraulic Oil - - 0.5 → 4.5 V 3 Pin Male Connector - <=2 ms 5 mA 5 V dc
New
RS Stock No. 206-7034
Mfr. Part No.PP - 222 AG6
BrandVega
£289.00
Each
Units
Relative -1bar 1000bar 0.3 % Analogue Gas, Vapour - - - - - - - 35 V
RS Stock No. 896-8459
Mfr. Part No.3500B700MG01G000
£102.00
Each
Units
Relative - 0.7bar 0.25 % Current Air, Gas, Water - G1/4 4 → 20 mA DIN 43650 Type A - - - 10 → 30 V dc
New
RS Stock No. 210-2329
Mfr. Part No.NPA-730B-05WG
£28.69
Each
Units
Gauge 0.18psi 5psi ±1.5 % Digital Gas - - - - - - - 3.3 V