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 different 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 - Similar to 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. 102-4128
BrandRS PRO
MYR1,360.75
Each
units
Relative -1bar 24bar ±0.25 % Analogue Gas, Liquid G1/4 4 → 20 mA DIN 43650 Type A - - - 9 → 32 V dc -
RS Stock No. 797-4964
BrandRS PRO
MYR932.11
Each
units
Relative 0bar 16bar ±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. 797-4986
BrandRS PRO
MYR981.16
Each
units
Relative 0bar 250bar ±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. 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. 175-4999
BrandRS PRO
MYR739.53
Each
units
Relative 0bar 400bar ±0.25 % Analogue - G1/4 4 → 20 mA M12 4-pin - - 20 mA 9 → 32 V dc -
RS Stock No. 175-4997
BrandRS PRO
MYR739.53
Each
units
Relative 0bar 40bar ±0.25 % Analogue - G1/4 4 → 20 mA M12 4-pin - - 20 mA 9 → 32 V dc -
RS Stock No. 123-5249
BrandRS PRO
MYR3,696.35
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. 175-5050
BrandRS PRO
MYR739.53
Each
units
Relative 0psi 5800psi ±0.25 % Analogue - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA 9 → 32 V dc -
RS Stock No. 828-5795
BrandRS PRO
MYR1,080.17
Each
units
Relative 0bar 10bar <±0.25 % Voltage Sewage, Viscous Fluid, Water G3/4 0 → 10 V M12 Connector - - 6 mA 14 → 32 V dc -
RS Stock No. 175-5032
BrandRS PRO
MYR830.36
Each
units
Relative -14.5psi 350psi ±0.25 % Analogue - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA 9 → 32 V dc -
RS Stock No. 797-4961
BrandRS PRO
MYR981.16
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. 828-5820
BrandRS PRO
MYR1,080.17
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. 102-4156
BrandRS PRO
MYR1,927.51
Each
units
Relative 0bar 500mbar ±0.25 % Analogue Oil G1/4 4 → 20 mA DIN 43650 Type A - - 28 mA 9 → 32 V dc -
RS Stock No. 797-4973
BrandRS PRO
MYR981.16
Each
units
Relative 0bar 400bar ±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. 102-4139
BrandRS PRO
MYR1,894.21
Each
units
Relative 0bar 5bar ±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. 123-5251
BrandRS PRO
MYR3,696.35
Each
units
Absolute 0bar 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. 175-5017
BrandRS PRO
MYR1,071.65
Each
units
Relative 0bar 1bar ±0.25 % Analogue - G1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc -
RS Stock No. 797-5005
BrandRS PRO
MYR981.16
Each
units
Relative 0bar 100bar ±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. 175-5021
BrandRS PRO
MYR1,071.65
Each
units
Relative 0psi 2psi ±0.25 % Analogue - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc -
RS Stock No. 797-5037
BrandRS PRO
MYR981.16
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 -
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