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. 123-6131
Mfr. Part No.251858
$122.64
Each
units
- 0.7bar 4.1bar ±0.1 bar SPST-NO Gas, Liquid BSP 1/4 - 1/4 x 1/32 Spade Terminal - - - - -
RS Stock No. 317-443
Mfr. Part No.6753-0002
BrandHerga
$84.45
Each
units
- - 0.072psi ±2.5 % - Air - - Spade Terminal - - - 250 V ac -
RS Stock No. 797-4955
BrandRS PRO
$341.31
Each
units
Relative 0bar 400bar ±0.25 % Current Air, Gas, Hydraulic Fluid, Liquid, Water G1/4 4 → 20 mA DIN 43650 Type A - - 20 mA 9 → 32 V dc -
RS Stock No. 124-2170
Mfr. Part No.XMPA12B2131C
$73.46
Each
units
Differential 0.3 (Falling) bar, 1.3 (Rising) bar 10.3 (Falling) bar, 12 (Rising) bar <3.5 (Repeat) % 2NC Air, Fresh Water, Sea Water G1/4 - Screw Clamp - - - - -
RS Stock No. 779-4257
Mfr. Part No.209957-RS
$144.71
Each
units
- 10psi 30psi - SPDT Air, Hydraulic NPT 1/4 - Screw Terminals - - 5 A 125/250 V -
RS Stock No. 779-4250
Mfr. Part No.212344-RS
$189.35
Each
units
- 25psi 75psi - SPDT Air, Hydraulic NPT 1/4 - Screw Terminals - - 5 A 125/250 V -
RS Stock No. 779-4279
Mfr. Part No.217464-RS
$285.53
Each
units
- 10psi 300psi - SPDT Air, Hydraulic BSP 1/4 - Screw Terminals - - 5 A 125/250 V -
RS Stock No. 111-5921
Mfr. Part No.PX3AG1BH010BSAAX
BrandHoneywell
$92.95
Each
units
Relative 0bar 10bar ±0.25 % Analogue Air, Brake Fluid, Hydraulic Fluid, Oil, Refrigeration Fluid G1/4 0.5 → 4.5 V Metri-Pack 150 - <2 ms 3 mA 4.75 → 5.25 V dc -
RS Stock No. 820-7035
Mfr. Part No.6742-0052
BrandHerga
$122.43
Each
units
- 60psi 120psi ±10 % SPCO Air, Gas, Liquid, Oil BSP 1/8 - Spade Terminal - - 21 A 220 V dc, 250 V ac -
RS Stock No. 772-9907
Mfr. Part No.XMPA12B2131
$87.18
Each
units
- - - - - - - - - - - - - -
RS Stock No. 779-4204
Mfr. Part No.PS61-20-4MGZ-A-SP
$82.27
Each
units
- 40psi 150psi - SPST-NO Hydraulic BSP 1/4 - Spade Terminal - - 100 VA 42 V dc -
RS Stock No. 779-4200
Mfr. Part No.PS61-10-4MGZ-A-SP
$86.12
Each
units
- 15psi 60psi - SPST-NO Hydraulic BSP 1/4 - Spade Terminal - - 100 VA 42 V dc -
RS Stock No. 124-2119
Mfr. Part No.9012GAW4
$808.86
Each
units
Differential 1.5 (Decreasing) psi, 3.5 (Differential) psi 7.5 (Decreasing) psi, 15 (Differential) 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. 779-4288
Mfr. Part No.214340-RS
$216.81
Each
units
- 1000psi 3000psi - SPDT Air, Hydraulic BSP 1/4 - Screw Terminals - - 5 A 125/250 V -
RS Stock No. 779-4226
Mfr. Part No.PS61-10-4MGZ-B-SP
$79.34
Each
units
- 15psi 60psi - SPST-NC Hydraulic BSP 1/4 - Spade Terminal - - 100 VA 42 V dc -
RS Stock No. 774-4085
Mfr. Part No.SDP1000-L
BrandSensirion
$151.05
Each
units
Differential -20Pa 500Pa 0.2 %, 1.5 % Analogue Air, Non-Aggressive Gas - 0.25 → 4 V 3 Pin SMD Connector - 40 ms 5.2 mA 4.75 → 5.25 V -
RS Stock No. 746-3499
Mfr. Part No.X5072-TB-A1-CA-H1-PA 250 bar SG
BrandDruck
$642.49
Each
units
Relative - 250bar ±0.2 % Analogue Fluid G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V -
RS Stock No. 173-2220
Mfr. Part No.SDP1000-L
BrandSensirion
$123.20
Each (In a Tray of 25)
units
Differential -20Pa 500Pa 0.2 %, 1.5 % Analogue Air, Non-Aggressive Gas - 0.25 → 4 V 3 Pin SMD Connector - 40 ms 5.2 mA 4.75 → 5.25 V -
RS Stock No. 535-1195
Mfr. Part No.526610CLBHTI
$319.59
Each
units
Differential -1000Pa 1000Pa ±1 % Analogue Air, Non-Conductive Gas - 4 → 20 mA Terminal Strip - 1 s - 24 V dc -
RS Stock No. 752-2456
Mfr. Part No.9012GCW2
BrandSquare D
$726.16
Each
units
Differential 170psi 560psi ±0.1 → 1 % - Gas, Liquid Level NPT 1/4 - 12" NPT - - 10 A 600 V -