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. 210-2304
Mfr. Part No.NPA-300B-005D
£15.457
Each (On a Reel of 300)
Units
Differential 5psi 60psi ±1.5 % Analogue Gas - - - - - - - 3.3 V
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
New
RS Stock No. 207-4678
Mfr. Part No.154N-100G-RT
£77.25
Each
Units
Gauge 0psi 100psi - - Gas, Liquid Level - - - - - - - -
RS Stock No. 197-6890
Mfr. Part No.MPRSS0001PG00001C
BrandHoneywell
£5.81
Each
Units
Gauge 0bar 1bar ±0.25 %FSS BFSL Transistor Gas, Liquid - - - - - - - 3.6 V
RS Stock No. 135-3778
Mfr. Part No.XMLRM01G1P25
£304.00
Each
Units
- -1bar 0bar ±1 % Analogue, Solid State PNP Air, Fresh Water, Hydraulic Oil, Refrigeration Fluid - - 4 → 20 mA M12 4/5-Pin Connector - 10 ms 50 mA 24 V dc
RS Stock No. 176-7889
Mfr. Part No.XMLP100BD11F
£97.00
Each
Units
- 0bar 100bar 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. 136-5978
Mfr. Part No.836P-D2NMGB36PA-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
RS Stock No. 177-8883
Mfr. Part No.XMLPM01GC21F
£100.00
Each
Units
- -1bar 1bar ±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. 135-3790
Mfr. Part No.XMXA25L2135
£77.90
Each
Units
- 3.5bar 250bar 3.5 % 1CO Air, Fresh Water, Sea Water - - - Screw Clamp - - 100 mA @ 250 V dc, 3 A @ 120 V ac 240 V ac, 250 V dc
RS Stock No. 136-5068
Mfr. Part No.3100S0040G05G000
£102.00
Each
Units
Relative 0bar 40bar 0.25 % Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil - G1/4 0 → 10 V Large DIN Connector - 1 ms 2 (Sink & Source) mA 8 → 30 V dc
RS Stock No. 202-3537
Mfr. Part No.MLH300PSB06A
BrandHoneywell
£121.70
Each
Units
Sealed Gauge 50psi 300psi ±0.25 % Analogue - - NPT 1/8 - - - - - 24 V
RS Stock No. 162-2083
Mfr. Part No.XMLP100BC21F
£99.00
Each
Units
Differential 0bar 100bar ±0.5 % Analogue Air, Fresh Water, Gas, Hydraulic Oil, Refrigeration Fluid - - 4 → 20 mA 3-Pin Male Connector - 2 ms 20 mA 12 → 24 V dc
RS Stock No. 176-0830
Mfr. Part No.2SMPB-02B
BrandOmron
£2.75
Each (In a Pack of 3)
Units
Absolute 30kPa 110kPa 100 Pa, ±3.9 Pa I2C Air - - - - - 10 ms 800 μA 3.6 V
RS Stock No. 174-9069
Mfr. Part No.SDP33-1500Pa-TR-250pcs
BrandSensirion
£22.12
Each
Units
Differential -1500Pa 1500Pa 6 % I2C Air, N2, O2 - 2 mm Tube - - - 3 ms 5.5 mA 5.5 V
New
RS Stock No. 206-7017
Mfr. Part No.PP - 222 298
BrandVega
£163.00
Each
Units
Relative -1bar 25bar 0.5 % Analogue Gas, Vapour - G1/2 - - - - - 35 V
RS Stock No. 136-5075
Mfr. Part No.3100S0700S05G000
£102.00
Each
Units
Relative 0bar 700bar 0.25 % Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil - G1/4 0 → 10 V Large DIN Connector - 1 ms 2 (Sink & Source) mA 8 → 30 V dc
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
New
RS Stock No. 210-2314
Mfr. Part No.NPA-300B-10WD
£18.77
Each (On a Reel of 300)
Units
Differential 0.36psi 35psi ±1.5 % Analogue Gas - - - - - - - 3.3 V
RS Stock No. 136-5036
Mfr. Part No.3100B0040G01E000
£94.00
Each
Units
Relative 0bar 40bar 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. 210-2318
Mfr. Part No.NPA-730B-001D
£25.49
Each
Units
Differential 1psi 5psi ±1.5 % Digital Gas - - - - - - - 3.3 V