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 Series Supply Voltage
RS Stock No. 788-4921
Mfr. Part No.2SMPP-02
BrandOmron
$5.62
Each (In a Pack of 2)
units
Relative 0bar 37kPa - Amplified Air - - PCB - - 130 μA - -
RS Stock No. 177-4880
Mfr. Part No.2SMPP-02
BrandOmron
$5.323
Each (In a Tube of 112)
units
- - - - - - - - - - - - - -
RS Stock No. 739-6777
Mfr. Part No.PBT-RB010SG1SSNAMA0Z
BrandSick
$213.18
Each
units
Relative 0bar 10bar ±0.5 % Analogue Fluid, Gas G1/4 4 → 20 mA M12 Connector - 4 ms 25 mA - 8 → 30 V dc
RS Stock No. 124-2174
Mfr. Part No.XMPA12C2142
$204.52
Each
units
Differential 1.3bar 12bar ±0.5 % 3NC - G1/4 - Screw Terminals - - - - -
RS Stock No. 746-3470
Mfr. Part No.X5072-TB-A1-CA-H1-PA 10.0 bar G
BrandDruck
$562.81
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. 317-443
Mfr. Part No.6753-0002
BrandHerga
$78.68
Each
units
- - 0.072psi ±2.5 % - Air - - Spade Terminal - - - - 250 V ac
RS Stock No. 124-2125
Mfr. Part No.9013FSG2J20
BrandSquare D
$62.78
Each
units
Differential 15 (Approximate) psi, 20 (Rising) psi 30 (Approximate) psi, 65 (Rising) psi ±3 (Repeat) % 2NC Fresh Water 0.25 in NPSF - Screw Clamp - - - - -
RS Stock No. 361-3457
Mfr. Part No.XMLA020A2S12
$606.60
Each
units
Differential 1bar 20bar 2 % Relay Air, Fresh Water, Hydraulic Fluid, Sea Water G1/4 - M20 Cable Gland - - 3 A ac, 100 mA dc - 120 → 240 V ac, 250 V dc
RS Stock No. 124-2163
Mfr. Part No.XMPA06B2131
$60.04
Each
units
Differential 0.2 (Falling) bar, 1 (Rising) bar 4.8 (Falling) bar, 6 (Rising) bar <3.5 (Repeat) % 2NC Air, Fresh Water, Sea Water G1/4 - Screw Clamp - - - - -
RS Stock No. 835-3933
Mfr. Part No.PU5415
$210.63
Each
units
Relative 0bar 6bar ±0.5 % Analogue Gas, Liquid G1/4 0 → 10 V M12 Connector - 1 ms - - 16 → 36 V dc
RS Stock No. 779-4200
Mfr. Part No.PS61-10-4MGZ-A-SP
$80.19
Each
units
- 15psi 60psi - SPST-NO Hydraulic BSP 1/4 - Spade Terminal - - 100 VA - 42 V dc
RS Stock No. 609-7094
Mfr. Part No.XMPE12C2242
$114.27
Each
units
Differential 1.3bar 12bar 3.5 % - Air, Fresh Water, Sea Water G3/8 - PG13.5 Cable Gland - - 1.5 A - -
RS Stock No. 828-5690
BrandRS PRO
$409.86
Each
units
Absolute 0bar 500mbar ±0.5 % Current Oil, Water G1/4 4 → 20 mA DIN 43650 Type A - - 28 mA - 9 → 32 V dc
RS Stock No. 795-4733
Mfr. Part No.3100R0400S01B000
$208.22
Each
units
Relative 0bar 400bar ±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. 797-5043
BrandRS PRO
$342.42
Each
units
Relative 0bar 1bar ±0.25 % Voltage Air, Gas, Hydraulic Fluid, Liquid, Water G1/4 0 → 5 V DIN 43650 Type C - - - - 9 → 32 V dc
RS Stock No. 302-5844
Mfr. Part No.XMLA020A2S11
$283.79
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. 124-2153
Mfr. Part No.XMLR010G0T26
$625.90
Each
units
- 0bar 10bar ≤1 % Analogue Air, Fresh Water, Hydraulic Oil, Refrigeration Fluid NPT 1/4 4 → 20 mA M12 Male 4-Pin Connector - ≤10 ms ≤50 mA - 24 V dc
RS Stock No. 752-2431
Mfr. Part No.9012GBW1
BrandSquare D
$469.84
Each
units
Differential 16psi 90psi ±0.1 → 1 % - Gas, Liquid Level NPT 1/4 - 12" NPT - - 10 A - 600 V
RS Stock No. 797-5018
BrandRS PRO
$363.22
Each
units
Relative 0bar 10bar ±0.25 % Current Air, Gas, Hydraulic Fluid, Liquid, Water G1/4 4 → 20 mA DIN 43650 Type C - - 20 mA - 9 → 32 V dc
RS Stock No. 235-5891
Mfr. Part No.24PCGFM6G
BrandHoneywell
$62.54
Each
units
Gauge 0psi 250psi 0.2 % Unamplified Nitrogen Gas, Oxygen, Water - 145 → 280 mV Solder Tag - 1 ms - - 10 V dc