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. 535-1145
Mfr. Part No.5266050LBHTI
£138.00
Each
Units
Differential -50Pa 50Pa ±1 % Analogue Air, Non-Conductive Gas - - 4 → 20 mA Terminal Strip - 1 s - 24 V dc
RS Stock No. 455-4567
Mfr. Part No.22ISBGB2500ABUA001
£223.00
Each
Units
Relative 0bar 25bar 0.25 % Analogue Fluid, Gas - G1/4 4 → 20 mA DIN 43650 Type A - - - 7 → 35 V dc
RS Stock No. 795-4705
Mfr. Part No.3100R0009V01B000
£96.50
Each
Units
Relative -1bar 9bar ±0.25 % Voltage Fluid, Gas - G1/4 0 → 5 V DIN 43650 Type A - 1 ms 4.5 mA 7 → 30 V dc
RS Stock No. 181-1384
Mfr. Part No.142PC15A
BrandHoneywell
£263.64
Each
Units
Absolute 0psi 15psi ±0.4 % Amplified Gas - - 1 → 6 V PCB - 1 ms 20 mA 7 → 16 V dc
RS Stock No. 169-7642
Mfr. Part No.PBN1B222-R6
BrandHoneywell
£731.43
1 Box of 25
Box(es)
Relative 24.9mbar 124.5mbar - Relay Air - - - Tab - - 40 mA 30 V ac/dc
RS Stock No. 407-237
Mfr. Part No.PBN1B332-R7
BrandHoneywell
£57.62
Each
Units
Gauge 127mbar 1.036bar - Relay Air - - - Tab - - 40 mA 30 V ac/dc
RS Stock No. 169-7645
Mfr. Part No.PBN1B332-R7
BrandHoneywell
£45.807
Each (In a Box of 25)
Units
Relative 127mbar 1.036bar - Relay Air - - - Tab - - 40 mA 30 V ac/dc
RS Stock No. 914-8390
Mfr. Part No.DP102EP
BrandPanasonic
£125.16
Each
Units
Relative -1bar 10bar ±1 % Relay Non-Corrosive Gas - G1/8 100 mA Wire Lead - 2.5 ms - 12 → 24 V dc
RS Stock No. 395-257
Mfr. Part No.163PC01D75
BrandHoneywell
£404.71
Each
Units
Differential -2.5in wg 2.5in wg ±2 % Amplified Gas - - 1 → 6 V Solder Tag - 1 ms 20 mA 6 → 16 V dc
RS Stock No. 746-3593
Mfr. Part No.X5072-TB-A2-CA-H1-PA 250 mbar G
BrandDruck
£321.00
Each
Units
Relative - 0.25bar ±0.1 % Analogue Fluid - G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 797-0940
Mfr. Part No.31ISB0010G01R000
£114.10
Each
Units
Relative 0bar 10bar 0.25 % Analogue Fluid, Gas - G1/4 4 → 20 mA DIN 43650 Type C - 1 ms 4.5 mA 8 → 24 V dc
RS Stock No. 178-5718
Mfr. Part No.PBN1B222-R6
BrandHoneywell
£39.03
Each
Units
Differential 24.9mbar 124.5mbar - Relay Air - - - Tab - - 40 mA 30 V ac/dc
RS Stock No. 407-243
Mfr. Part No.PBN3D421-R1
BrandHoneywell
£48.58
Each
Units
Differential 24.9mbar 69.8mbar - Relay Air, Fluid - - - Tab - - 5 A 250 V ac
RS Stock No. 125-1267
Mfr. Part No.PN7070
£309.96
Each
Units
Relative 0bar 400bar ±0.5 % 2x PNP/NPN-NO/NC Fluid - G1/4 - M12 Connector IO-LINK <3 (Minimum Switching Output) ms 150 mA @ +60 °C, 200 mA @ +60 °C, 250 mA @ +40 °C 18 → 30 V dc
RS Stock No. 169-7646
Mfr. Part No.PBN3D421-R1
BrandHoneywell
£33.294
Each (In a Box of 25)
Units
Differential 24.9mbar 69.8mbar - Relay Air, Fluid - - - Tab - - 5 A 250 V ac
RS Stock No. 324-0958
Mfr. Part No.XMLA070D2S11
£144.00
Each
Units
Differential 50bar 70bar 2 % Relay Hydraulic Fluid - G1/4 - PG13.5 Cable Gland - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc
RS Stock No. 407-209
Mfr. Part No.PBN1B222-R6
BrandHoneywell
£45.05
Each
Units
Gauge 24.9mbar 124.5mbar - Relay Air - - - Tab - - 40 mA 30 V ac/dc
RS Stock No. 463-5420
Mfr. Part No.401001/000-482-405-523-20-601-61/000
BrandJumo
£126.81
Each
Units
- -1bar 5bar - - - - G1/2 4 → 20 mA DIN 43650 Type A - - - 10 → 30 V dc
RS Stock No. 169-7638
Mfr. Part No.163PC01D75
BrandHoneywell
£390.654
Each (In a Box of 30)
Units
Differential -2.5in wg 2.5in wg ±2 % Amplified Gas - - 1.2 V Solder Tag - 1 ms - 8 V dc
RS Stock No. 463-5616
Mfr. Part No.404366/000-467-405-504-20-61/000
BrandJumo
£244.04
Each
Units
Relative 0bar 400bar 0.5 % Analogue Fluid, Gas - G1/2 4 → 20 mA DIN 43650 Type A - - - 10 → 30 V dc