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. 136-6000
Mfr. Part No.836P-D2GBGB14PA-D4
£293.00
Each
Units
Relative 0bar 10bar ±1 % Analogue, PNP Gas, Liquid, Steam - G1/2 4 → 20 mA 4-Pin M12 DC Micro Connector IO-LINK - 450 mA 15 → 35 V dc
RS Stock No. 135-3753
Mfr. Part No.XMLG010D23
£211.00
Each
Units
- 0bar 10bar ±0.1 % Analogue Air, Corrosive Fluid, Fresh Water, Hydraulic Oil, Sea Water - - 4 → 20 mA M12 3-Pin Connector - 2 ms 20 mA 12 V dc, 24 V dc
RS Stock No. 177-8868
Mfr. Part No.XMLP001GD2BF
£104.00
Each
Units
- 0bar 1bar ±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. 135-3750
Mfr. Part No.XMLG006D21
£148.00
Each
Units
- 0bar 6bar ±0.1 % Analogue Air, Corrosive Fluid, Fresh Water, Hydraulic Oil, Sea Water - - 4 → 20 mA M12 3-Pin Connector - 2 ms 20 mA 12 V dc, 24 V dc
RS Stock No. 179-9887
Mfr. Part No.XMLB500D2S12
£191.00
Each
Units
- 30bar 500bar <2 % - Hydraulic Oil - - - Screw Clamp Terminal - - 3 A 500 V
RS Stock No. 177-8878
Mfr. Part No.XMLPM00GC21F
£100.00
Each
Units
- -1bar 0bar ±0.5 % Analogue Air, Fresh Water, Gas, Hydraulic Oil - - 4 → 20 mA 3 Pin Male Connector - <=2 ms 23 mA 12 → 24 V dc
RS Stock No. 136-5034
Mfr. Part No.3100B0016G01E000
£94.00
Each
Units
Relative 0bar 16bar 0.25 % 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
New
RS Stock No. 213-3330
Mfr. Part No.PBS2-RB1X0SG1SSDQ5A0Z
BrandSick
£283.80
Each
Units
Relative 0bar 1bar <±0.5 % 2x PNP/NPN-NO/NC + Current/Voltage Air, Gas, Hydraulic Fluid, Liquid, Oil, Water - - 4-20mA / 0-10V M12 Connector IO-LINK 5 ms 600 mA 15 - 35 V
RS Stock No. 146-5272
Mfr. Part No.XMLP010BD71F
£96.90
Each
Units
Differential - 30bar ±0.5 % Analogue Air, Fresh Water, Gas, Hydraulic Oil, Refrigeration Fluid - G1/4 0 → 10 V 4-Pin M12 Male Connector - ≤2 ms <7 mA 24 V dc
RS Stock No. 177-8864
Mfr. Part No.XMLPM05GD21F
£95.00
Each
Units
- -1bar 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. 190-9711
Mfr. Part No.9021221
BrandWIKA
£342.17
Each
Units
- 0bar 6bar ±0.5 % Current Adhesive, Contaminated Media, Crystallising, Particle-Laden, Paste-Like, Viscous - G1/2 4 → 20 mA Angular connector DIN 175301-803 A - - 20 mA 10 → 30 V dc
RS Stock No. 313-7010
Mfr. Part No.6731-0027
BrandHerga
£22.36
Each
Units
- 0.72psi 1.8psi - Relay - - - - Spade Terminal - - - 250 V ac
RS Stock No. 179-9890
Mfr. Part No.XMLK016B2C21
£99.00
Each
Units
Differential - - ±1 % Analogue Fluid - G1/4 4 → 20 mA EN 175301-803-A Male Connector - 5 ms 20 mA 24 V dc
RS Stock No. 176-7851
Mfr. Part No.XMLP010BD11F
£95.00
Each
Units
- 0bar 10bar 0.1 %, ±0.5 (Measurement) % Analogue Air, Fresh Water, Gas, Hydraulic Oil, Refrigeration Fluid - - 0.5 → 4.5 V 4 Pin M12 Male Connector - ≤2 ms 7 mA 5 V dc
RS Stock No. 135-3762
Mfr. Part No.XMLK006B2D21
£95.00
Each
Units
- 0bar 6bar ±0.3 % Analogue Air, Fresh Water - - 4 → 20 mA M12 3-Pin Connector - 2 ms 20 mA 24 V dc
RS Stock No. 176-7857
Mfr. Part No.XMLP016BC270
£96.00
Each
Units
- 0bar 16bar 0.1 %, ±0.5 (Measurement) % Analogue Air, Fresh Water, Gas, Hydraulic Oil, Refrigeration Fluid - 7/16 - 20 UNF SAE 4 → 20 mA EN 175301-803-A 3 Pin Male Connector - ≤2 ms 23 mA 12 → 24 V dc
RS Stock No. 135-3769
Mfr. Part No.XMLK300P2D23
£134.00
Each
Units
- 0psi 300psi ±0.3 % Analogue Air, Fresh Water - - 4 → 20 mA M12 3-Pin Connector - 2 ms 20 mA 24 V dc
RS Stock No. 202-3533
Mfr. Part No.MIPAG1XX050BSAAX
BrandHoneywell
£34.23
Each
Units
Sealed Gauge 12bar 50bar ±0.15 % Analogue Liquid Level - G1/4 - - - - - 5 V dc
New
RS Stock No. 210-0737
Mfr. Part No.PP20H-2.3B20R.D115.542020.000
BrandBaumer
£344.60
Each
Units
Relative -1bar 40bar ±0.5 % Current Oil - M12 - - - - - 30 V
RS Stock No. 136-5979
Mfr. Part No.836P-D2NFGB36PA-D4
£293.00
Each
Units
Relative 0bar 25bar ±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