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 Calibrated Process Connection Analogue Output Electrical Connection Response Time Maximum Current Supply Voltage Interface
RS Stock No. 123-5243
BrandRS PRO
£226.12
Each
Units
Gauge 0mbar 50mbar ±0.25 % Analogue Air, Hydraulic Fluid, Liquid, Non-Aggressive Gas, Oil, Water - G1/4 0 → 5 V, 4 → 20 mA Battery - - - -
RS Stock No. 797-5049
BrandRS PRO
£135.67
Each
Units
Gauge 0bar 250bar ±0.25 % Voltage Air, Gas, Hydraulic Fluid, Liquid, Water - BSP 1/4 0 → 100 mV DIN 43650 Connector - - 3 → 12 V dc -
RS Stock No. 102-4153
BrandRS PRO
£340.30
Each
Units
Gauge 0mbar 50mbar ±0.25 % Analogue Oil - BSP 1/4 4 → 20 mA DIN 46350 Connector - 28 mA 9 → 32 V dc -
RS Stock No. 797-5002
BrandRS PRO
£135.67
Each
Units
Gauge 0bar 400bar ±0.25 % Voltage Air, Gas, Hydraulic Fluid, Liquid, Water - BSP 1/4 0 → 100 mV DIN 43650 Connector - - 3 → 12 V dc -
RS Stock No. 797-5033
BrandRS PRO
£142.81
Each
Units
Gauge 0bar 40bar ±0.25 % Voltage Air, Gas, Hydraulic Fluid, Liquid, Water - BSP 1/4 0 → 5 V DIN 43650 Connector - - 9 → 32 V dc -
RS Stock No. 123-5246
BrandRS PRO
£368.53
Each
Units
Gauge 0mbar 500mbar ±0.25 % Analogue Air, Hydraulic Fluid, Liquid, Non-Aggressive Gas, Oil, Water - G1/4 0 → 5 V, 4 → 20 mA Battery - - - -
RS Stock No. 102-4125
BrandRS PRO
£198.06
Each
Units
Gauge -1bar 9bar ±0.25 % Analogue Gas, Liquid - BSP 1/4 4 → 20 mA DIN 46350 Connector - - 9 → 32 V dc -
RS Stock No. 828-5818
BrandRS PRO
£157.22
Each
Units
Gauge -1bar 9bar <±0.25 % Current Sewage, Viscous Fluid, Water - G3/4 4 → 20 mA M12 Connector - 28 mA 9 → 32 V dc -
RS Stock No. 102-4132
BrandRS PRO
£176.37
Each
Units
Gauge 0bar 250bar ±0.25 % Analogue Gas, Liquid - BSP 1/4 4 → 20 mA DIN 46350 Connector - - 9 → 32 V dc -
RS Stock No. 102-4159
BrandRS PRO
£392.00
Each
Units
Absolute 0mbar 500mbar ±0.25 % Analogue Oil - BSP 1/4 4 → 20 mA DIN 46350 Connector - 28 mA 9 → 32 V dc -
RS Stock No. 828-5754
BrandRS PRO
£217.43
Each
Units
Gauge 0mbar 100mbar <±0.25 % Current Sewage, Viscous Fluid, Water - G3/4 4 → 20 mA M12 Connector - 28 mA 9 → 32 V dc -
RS Stock No. 123-5248
BrandRS PRO
£368.53
Each
Units
Gauge 0mbar 1000mbar ±0.25 % Analogue Air, Hydraulic Fluid, Liquid, Non-Aggressive Gas, Oil, Water - G1/4 0 → 5 V, 4 → 20 mA Battery - - - -
RS Stock No. 828-5791
BrandRS PRO
£157.22
Each
Units
Gauge 0bar 5bar <±0.25 % Voltage Sewage, Viscous Fluid, Water - G3/4 0 → 10 V M12 Connector - 6 mA 14 → 32 V dc -
RS Stock No. 828-5760
BrandRS PRO
£157.22
Each
Units
Gauge 0bar 2bar <±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
£176.37
Each
Units
Gauge 0bar 6bar ±0.25 % Analogue Gas, Liquid - BSP 1/4 4 → 20 mA DIN 46350 Connector - - 9 → 32 V dc -
RS Stock No. 828-5707
BrandRS PRO
£185.34
Each
Units
Gauge 0mbar 50mbar <±0.25 % Current Oil, Water - BSP 1/4 4 → 20 mA DIN 43650 Connector - 28 mA 9 → 32 V dc -
RS Stock No. 123-5251
BrandRS PRO
£538.01
Each
Units
Absolute 0mbar 1000mbar ±0.25 % Analogue Air, Hydraulic Fluid, Liquid, Non-Aggressive Gas, Oil, Water - G1/4 0 → 5 V, 4 → 20 mA Battery - - - -
RS Stock No. 123-5245
BrandRS PRO
£368.53
Each
Units
Gauge 0mbar 250mbar ±0.25 % Analogue Air, Hydraulic Fluid, Liquid, Non-Aggressive Gas, Oil, Water - G1/4 0 → 5 V, 4 → 20 mA Battery - - - -
RS Stock No. 828-5795
BrandRS PRO
£157.22
Each
Units
Gauge 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. 828-5732
BrandRS PRO
£149.49
Each
Units
Gauge 0mbar 750mbar <±0.25 % Current Oil, Water - BSP 1/4 4 → 20 mA DIN 43650 Connector - 28 mA 9 → 32 V dc -
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