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. 797-4983
BrandRS PRO
MYR815.61
Each
units
Relative 0bar 1bar ±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. 123-5250
BrandRS PRO
MYR3,696.35
Each
units
Absolute 0bar 0.75bar ±0.25 % Analogue Air, Hydraulic Fluid, Liquid, Non-Aggressive Gas, Oil, Water G1/4 0 → 5 V, 4 → 20 mA Wireless - - - - -
RS Stock No. 175-5015
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. 102-4140
BrandRS PRO
MYR2,420.92
Each
units
Relative 0bar 10bar ±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. 828-5820
BrandRS PRO
MYR972.15
Each
units
Absolute 0bar 1bar <±0.25 % Current Sewage, Viscous Fluid, Water G3/4 4 → 20 mA M12 Connector - - 28 mA 9 → 32 V dc -
RS Stock No. 175-5035
BrandRS PRO
MYR747.32
Each
units
Relative 0psi 15psi ±0.25 % Analogue - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc -
RS Stock No. 175-5028
BrandRS PRO
MYR964.49
Each
units
Relative 0psi 15psi ±0.25 % Analogue - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA 9 → 32 V dc -
RS Stock No. 175-5003
BrandRS PRO
MYR830.36
Each
units
Relative -1bar 9bar ±0.25 % Analogue - G1/4 4 → 20 mA M12 4-pin - - 20 mA 9 → 32 V dc -
RS Stock No. 123-5244
BrandRS PRO
MYR2,278.76
Each
units
Relative 0bar 0.1bar ±0.25 % Analogue Air, Hydraulic Fluid, Liquid, Non-Aggressive Gas, Oil, Water G1/4 0 → 5 V, 4 → 20 mA Wireless - - - - -
RS Stock No. 175-5047
BrandRS PRO
MYR665.58
Each
units
Relative 0psi 300psi ±0.25 % Analogue - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc -
RS Stock No. 175-5033
BrandRS PRO
MYR747.32
Each
units
Relative -14.5psi 350psi ±0.25 % Analogue - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc -
RS Stock No. 175-5029
BrandRS PRO
MYR1,016.61
Each
units
Relative 0psi 15psi ±0.25 % Analogue - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc -
RS Stock No. 175-5005
BrandRS PRO
MYR747.32
Each
units
Relative -1bar 9bar ±0.25 % Analogue - G1/4 0 → 5 V M12 4-pin - - - 9 → 32 V dc -
RS Stock No. 797-5015
BrandRS PRO
MYR833.99
Each
units
Relative 0bar 25bar ±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. 175-5046
BrandRS PRO
MYR665.58
Each
units
Relative 0psi 300psi ±0.25 % Analogue - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA 9 → 32 V dc -
RS Stock No. 828-5767
BrandRS PRO
MYR972.15
Each
units
Relative 0bar 10bar <±0.25 % Current Sewage, Viscous Fluid, Water G3/4 4 → 20 mA M12 Connector - - 28 mA 9 → 32 V dc -
RS Stock No. 102-4159
BrandRS PRO
MYR2,199.87
Each
units
Absolute 0bar 500mbar ±0.25 % Analogue Oil G1/4 4 → 20 mA DIN 43650 Type A - - 28 mA 9 → 32 V dc -
RS Stock No. 175-4991
BrandRS PRO
MYR739.53
Each
units
Relative 0bar 16bar ±0.25 % Analogue - G1/4 0 → 5 V M12 4-pin - - - 9 → 32 V dc -
RS Stock No. 175-5000
BrandRS PRO
MYR665.58
Each
units
Relative 0bar 400bar ±0.25 % Analogue - G1/4 0 → 5 V M12 4-pin - - - 9 → 32 V dc -
RS Stock No. 175-5044
BrandRS PRO
MYR665.58
Each
units
Relative 0psi 1500psi ±0.25 % Analogue - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA 9 → 32 V dc -