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
New
RS Stock No. 212-9089
Mfr. Part No.54D-V110G-DA1-AA
£127.31
Each
Units
Relative -1bar 1bar ?0.5 % Transistor Gas, Liquid Level - - - - - - - 32 V dc
RS Stock No. 176-7909
Mfr. Part No.XMLP200PP730
£126.00
Each
Units
- 0psi 200psi 0.1 %, ±0.5 (Measurement) % Analogue Air, Fresh Water, Gas, Hydraulic Oil, Refrigeration Fluid - - 0 → 10 V 3 Pin Male Connector - ≤2 ms 7 mA 24 V dc
RS Stock No. 176-7862
Mfr. Part No.XMLP016BD270
£65.96
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 4 Pin M12 Male Connector - ≤2 ms 23 mA 12 → 24 V dc
New
RS Stock No. 210-0735
Mfr. Part No.PP20H-2.3B20R.A114.542020.000
BrandBaumer
£327.80
Each
Units
Relative -1bar 40bar ±0.5 % Current Oil - M12 - - - - - 30 V
RS Stock No. 125-8437
Mfr. Part No.FMUT1KVMS08
BrandParker
£136.83
Each
Units
Differential - 420bar - - Hydraulic - SAE 8 - DIN 43650 - - 20 A 250 V ac/dc
RS Stock No. 200-6125
Mfr. Part No.MS580502BA01-50
£6.55
Each (On a Reel of 2000)
Units
- - - - - - - - - - - - - -
RS Stock No. 176-7924
Mfr. Part No.XMLP400BC21F
£99.00
Each
Units
- 0bar 400bar 0.1 %, ±0.5 (Measurement) % Analogue Air, Fresh Water, Gas, Hydraulic Oil, Refrigeration Fluid - - 4 → 20 mA EN 175301-803-A 3 Pin Male Connector - ≤2 ms 23 mA 12 → 24 V dc
New
RS Stock No. 213-3350
Mfr. Part No.PBT-RB250SG1SSNULA0Z
BrandSick
£107.84
Each
Units
Relative 0bar 250bar <±1 % Voltage Air, Gas, Hydraulic Fluid, Liquid, Oil, Water - - 0 - 5 V DIN EN 175301 Connector - <4 ms 8 mA 8 - 30 V
New
RS Stock No. 212-9083
Mfr. Part No.34D-P600G-DA1-AA
£292.31
Each
Units
Relative 0bar 600bar ?0.5 % Transistor Gas, Liquid Level - - - - - - - 30 V dc
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
New
RS Stock No. 206-7044
Mfr. Part No.PP - 222 3A4
BrandVega
£337.00
Each
Units
Relative -1bar 60bar 0.3 % Analogue Gas, Vapour - - - - - - - 35 V
RS Stock No. 136-9408
Mfr. Part No.ACW1M129012
£160.00
Each
Units
- 0.07bar 7.6bar - 1CO Air, Hydraulic Oil, Non-Corrosive Fluid - G1/4 - M20 x 1.5 mm Cable Gland - - 5 A @ 24 V 500 V, 600 V
RS Stock No. 177-8851
Mfr. Part No.XMEP100BT21F
£117.00
Each
Units
- 0bar 100bar ±0.5 % Analogue Air, Fresh Water, Hydraulic Oil - G1/4 4 → 20 mA 3 Pin DEUTSCH Connector DT04-3P - <=2 ms 23 mA 12 → 24 V dc
RS Stock No. 146-2925
Mfr. Part No.XMLP004GD71F
£96.00
Each
Units
Differential 0bar 4bar 0.1 % Analogue Air, Fresh Water, Gas, Hydraulic Oil - - 0 → 10 V 4-Pin M12 Male Connector - ≤2 ms <7 mA 24 V dc
RS Stock No. 736-1481
Mfr. Part No.PBS-RB400SG2SS0AMA0Z
BrandSick
£224.20
Each
Units
Relative 0bar 400bar ±1 % 2 x PNP NO/NC Programmable Fluid, Gas - G1/4 - M12 Connector - 3 ms 250 mA 15 → 35 V dc
RS Stock No. 136-5060
Mfr. Part No.3100S0250S01E000
£94.00
Each
Units
Relative 0bar 250bar 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. 136-5098
Mfr. Part No.5000BGN3500G3000A
£362.35
Each
Units
Relative 201mbar 0.35bar 0.2 % Analogue Sea Water - G1/4 4 → 20 mA DIN 43650 Type A - 5 ms - 9 → 35 V dc
RS Stock No. 136-5984
Mfr. Part No.836P-D2NFGB10PA-D4
£293.00
Each
Units
Relative 0bar 6.89bar ±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. 176-7937
Mfr. Part No.XMLPM09BC21F
£134.00
Each
Units
- -1bar 9bar 0.1 %, ±0.5 (Measurement) % Analogue Air, Fresh Water, Gas, Hydraulic Oil, Refrigeration Fluid - - 4 → 20 mA EN 175301-803-A 3 Pin Male Connector - ≤2 ms 23 mA 12 → 24 V dc
New
RS Stock No. 210-2321
Mfr. Part No.NPA-730B-02WD
£17.95
Each (On a Reel of 300)
Units
Differential 0.07psi 5psi ±1.5 % Digital Gas - - - - - - - 3.3 V