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 Process Connection Analogue Output Electrical Connection Communication Protocol Response Time Maximum Current Supply Voltage Interface
RS Stock No. 914-8322
Mfr. Part No.DP-101A-M-P
BrandPanasonic
SGD282.56
Each
units
Relative -1bar 10bar - PNP Non-Corrosive Gas G1/8 1 → 5 V dc, 4 → 20 mA Wire Lead - 5000 ms 100 mA 12 → 24 V dc -
RS Stock No. 124-2121
Mfr. Part No.9012GAW6
SGD506.02
Each
units
Differential 5 (Decreasing) psi, 10 (Differential) psi 49 (Differential) psi, 250 (Decreasing) psi <4 (Repeat) % SPDT-NO/NC Air, Hydraulic Oil, Non-Corrosive Gas, Non-Corrosive Liquids 0.25 in NPTF - 0.5 in NPT - - 6 A 240 V ac, 250 V dc -
RS Stock No. 752-2437
Mfr. Part No.9012GAW6
SGD612.05
Each
units
Differential 10psi 49psi ±0.1 → 1 % - Gas, Liquid Level NPT 1/4 - 12" NPT - - 10 A 600 V -
RS Stock No. 235-5778
Mfr. Part No.24PCEFA6D
BrandHoneywell
SGD55.87
Each
units
Differential 0psi 0.5psi 0.2 % Unamplified Nitrogen Gas, Oxygen, Water - 25 → 45 mV Solder Tag - 1 ms - 10 V dc -
RS Stock No. 313-5345
Mfr. Part No.14X1FA1GV1
BrandVega
SGD409.73
Each
units
Relative 0bar 10bar 0.3 % - Fluid, Gas, Vapour G1/2 4 → 20 mA DIN 43650 Connector - - - 12 → 36 V dc -
RS Stock No. 302-5844
Mfr. Part No.XMLA020A2S11
SGD235.82
Each
units
Differential 1bar 20bar 2 % Relay Air, Fresh Water, Hydraulic Fluid, Sea Water G1/4 - PG13.5 Cable Gland - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc -
RS Stock No. 361-3687
Mfr. Part No.9012ADW7S1M12
SGD792.21
Each
units
Differential 38bar 340bar - - Fluid, Oil G3/8 - PG13.5 Cable Gland - - 3 A dc, 5 A ac 120 → 240 V dc, 120 → 600 V ac -
RS Stock No. 535-1167
Mfr. Part No.5266250LBHTI
SGD286.19
Each
units
Differential -250Pa 250Pa ±1 % Analogue Air, Non-Conductive Gas - 4 → 20 mA Terminal Strip - 1 s - 24 V dc -
RS Stock No. 609-7022
Mfr. Part No.XMLB070D2S11
SGD356.49
Each
units
Differential 7bar 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. 455-4797
Mfr. Part No.3100B0400S01E000
SGD205.06
Each
units
Relative 0bar 400bar 0.25 % Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil G1/4 4 → 20 mA M12 Connector - 1 ms - 8 → 30 V dc -
RS Stock No. 286-686
Mfr. Part No.26PCBFA6D
BrandHoneywell
SGD60.27
Each
units
Differential 0psi 5psi ±0.25 % Unamplified Nitrogen Gas, Oxygen - 47 → 53 mV 4-Pin Connector - 1 ms - 10 V dc -
RS Stock No. 423-3709
Mfr. Part No.404366/000-459-405-504-20-61/000
BrandJumo
SGD495.76
Each
units
Relative 0bar 10bar 0.2 % - Fluid, Gas G1/2 4 → 20 mA DIN 43650 Connector - - - 10 → 30 V dc -
RS Stock No. 535-1151
Mfr. Part No.5266100BHTI
SGD289.18
Each
units
Differential -100Pa 100Pa ±1 % Analogue Air, Non-Conductive Gas - 4 → 20 mA Terminal Strip - 1 s - 24 V dc -
RS Stock No. 395-7101
Mfr. Part No.2600BGA1019M3HA017
SGD774.16
Each
units
Relative 0bar 0.5bar 0.25 % Amplified - - 4 → 20 mA Wire Lead - 0.5 ms 20 mA 7 → 35 V dc -
RS Stock No. 399-1612
Mfr. Part No.XMAV06L2135
SGD146.54
Each
units
Differential 1bar 6bar 3.5 % Relay Air, Fresh Water, Sea Water G1/4 - Screw Terminals - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc -
RS Stock No. 914-8426
Mfr. Part No.DP-001-P
BrandPanasonic
SGD227.15
Each
units
Relative -1bar 1bar - PNP Air, Non-Corrosive Gas G1/8 - Wire Lead - 250 ms 50 mA 12 → 24 V dc -
RS Stock No. 818-4623
Mfr. Part No.D6F-PH0505AD3
BrandOmron
SGD112.93
Each
units
Differential -50Pa 50Pa ±3 % I2C Air - - PCB - 33 ms 6 mA 2.3 → 3.6 V dc -
RS Stock No. 746-3470
Mfr. Part No.X5072-TB-A1-CA-H1-PA 10.0 bar G
BrandDruck
SGD425.53
Each
units
Relative - 10bar ±0.2 % Analogue Fluid G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V -
RS Stock No. 535-1218
Mfr. Part No.5266100LBACTI
SGD289.18
Each
units
Differential -100Pa 100Pa ±1 % Analogue Air, Non-Conductive Gas - 0 → 10 V Terminal Strip - 1 s - 24 V ac/dc -
RS Stock No. 795-4755
Mfr. Part No.3100B0400S05G000
SGD211.53
Each
units
Relative 0bar 400bar ±0.25 % Current Fluid, Gas G1/4 4 → 20 mA DIN 43650 Type A - 1 ms 20 mA 8 → 30 V dc -