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. 123-5241
BrandRS PRO
MYR1,299.68
Each
units
Relative 0bar 250bar ±0.25 % Analogue Air, Hydraulic Fluid, Liquid, Non-Aggressive Gas, Oil, Water G1/4 0 → 5 V, 4 → 20 mA Wireless - - - - -
RS Stock No. 175-5002
BrandRS PRO
MYR665.58
Each
units
Relative 0bar 6bar ±0.25 % Analogue - G1/4 0 → 5 V M12 4-pin - - - 9 → 32 V dc -
RS Stock No. 123-5249
BrandRS PRO
MYR3,326.72
Each
units
Absolute 0bar 500mbar ±0.25 % Analogue Air, Hydraulic Fluid, Liquid, Non-Aggressive Gas, Oil, Water G1/4 0 → 5 V, 4 → 20 mA Wireless - - - - -
RS Stock No. 797-5037
BrandRS PRO
MYR833.99
Each
units
Relative 0bar 10bar ±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. 123-5233
BrandRS PRO
MYR2,070.07
Each
units
Relative 0bar 6bar ±0.25 % Analogue Air, Hydraulic Fluid, Liquid, Non-Aggressive Gas, Oil, Water G1/4 0 → 5 V, 4 → 20 mA Wireless - - - - -
RS Stock No. 797-5043
BrandRS PRO
MYR833.99
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. 797-4967
BrandRS PRO
MYR1,010.04
Each
units
Relative 0bar 250bar ±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. 175-5023
BrandRS PRO
MYR1,071.65
Each
units
Relative 0psi 5psi ±0.25 % Analogue - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc -
RS Stock No. 175-5049
BrandRS PRO
MYR665.58
Each
units
Relative 0psi 3600psi ±0.25 % Analogue - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc -
RS Stock No. 797-4961
BrandRS PRO
MYR833.99
Each
units
Relative -1bar 24bar ±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. 102-4148
BrandRS PRO
MYR1,749.52
Each
units
Relative -1bar 19bar ±0.25 % Analogue Grey Water, Sewage, Viscous Fluid G3/4 4 → 20 mA M12 4-pin - - 28 mA 12 → 28 V dc -
RS Stock No. 518-4434
BrandRS PRO
MYR608.64
Each
units
Gauge 0bar 10bar ≤0.5 % Analogue Gas, Liquid G1/4 4 → 20 mA M12 Connector - ≤3 ms - 10 → 30 V dc -
RS Stock No. 175-4986
BrandRS PRO
MYR761.29
Each
units
Relative 0bar 10bar ±0.25 % Analogue - G1/4 0 → 5 V M12 4-pin - - - 9 → 32 V dc -
RS Stock No. 797-4989
BrandRS PRO
MYR792.29
Each
units
Relative 0bar 1bar ±0.25 % Voltage Air, Gas, Hydraulic Fluid, Liquid, Water G1/4 0 → 100 mV DIN 43650 Type C - - - 3 → 12 V dc -
RS Stock No. 102-4141
BrandRS PRO
MYR1,749.52
Each
units
Relative 0bar 20bar ±0.25 % Analogue Grey Water, Sewage, Viscous Fluid G3/4 4 → 20 mA M12 4-pin - - 28 mA 12 → 28 V dc -
RS Stock No. 175-5015
BrandRS PRO
MYR1,071.65
Each
units
Relative 0bar 0.75bar ±0.25 % Analogue - G1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc -
RS Stock No. 828-5739
BrandRS PRO
MYR825.17
Each
units
Relative 0bar 1bar <±0.25 % Current Oil, Water G1/4 4 → 20 mA DIN 43650 Type A - - 28 mA 9 → 32 V dc -
RS Stock No. 828-5754
BrandRS PRO
MYR1,493.83
Each
units
Relative 0bar 0.1bar <±0.25 % Current Sewage, Viscous Fluid, Water G3/4 4 → 20 mA M12 Connector - - 28 mA 9 → 32 V dc -
RS Stock No. 102-4124
BrandRS PRO
MYR1,196.83
Each
units
Relative 0bar 6bar ±0.25 % Analogue Gas, Liquid G1/4 4 → 20 mA DIN 43650 Type A - - - 9 → 32 V dc -
RS Stock No. 828-5735
BrandRS PRO
MYR1,001.01
Each
units
Relative 0bar 0.75bar <±0.25 % Voltage Oil, Water G1/4 0.5 → 4.5 V DIN 43650 Type A - - 6 mA 9 → 32 V dc -