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. 797-4983
BrandRS PRO
PHP10,874.41
Each
units
Gauge 0bar 1bar ±0.25 % Current Air, Gas, Hydraulic Fluid, Liquid, Water BSP 1/4 4 20 mA DIN 43650 Connector - - 20 mA 9 32 V dc -
RS Stock No. 102-4130
BrandRS PRO
PHP14,235.94
Each
units
Gauge 0bar 40bar ±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
PHP42,232.08
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. 828-5741
BrandRS PRO
PHP8,174.04
Each
units
Gauge 0bar 16bar <±0.25 % Current Air, Gas, Hydraulic Fluid, Liquid, Water BSP 1/4 4 20 mA DIN 43650 Connector - - 20 mA 9 32 V dc -
RS Stock No. 102-4126
BrandRS PRO
PHP14,235.94
Each
units
Gauge 0bar 10bar ±0.25 % Analogue Gas, Liquid BSP 1/4 4 20 mA DIN 46350 Connector - - - 9 32 V dc -
RS Stock No. 102-4127
BrandRS PRO
PHP14,235.94
Each
units
Gauge 0bar 16bar ±0.25 % Analogue Gas, Liquid BSP 1/4 4 20 mA DIN 46350 Connector - - - 9 32 V dc -
RS Stock No. 102-4129
BrandRS PRO
PHP14,235.94
Each
units
Gauge 0bar 25bar ±0.25 % Analogue Gas, Liquid BSP 1/4 4 20 mA DIN 46350 Connector - - - 9 32 V dc -
RS Stock No. 797-5005
BrandRS PRO
PHP11,446.70
Each
units
Gauge 0bar 100bar ±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. 828-5833
BrandRS PRO
PHP12,601.71
Each
units
Absolute 0bar 5bar <±0.25 % Current Water G3/4 4 20 mA M12 Connector - - 28 mA 9 32 V dc -
RS Stock No. 102-4131
BrandRS PRO
PHP14,235.94
Each
units
Gauge 0bar 100bar ±0.25 % Analogue Gas, Liquid BSP 1/4 4 20 mA DIN 46350 Connector - - - 9 32 V dc -
RS Stock No. 102-4161
BrandRS PRO
PHP30,902.41
Each
units
Absolute 0mbar 1000mbar ±0.25 % Analogue Oil BSP 1/4 4 20 mA DIN 46350 Connector - - 28 mA 9 32 V dc -
RS Stock No. 102-4124
BrandRS PRO
PHP20,447.74
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. 828-5748
BrandRS PRO
PHP11,982.13
Each
units
Gauge 0mbar 1000mbar <±0.25 % Voltage Oil, Water BSP 1/4 0.5 4.5 V DIN 43650 Connector - - 6 mA 9 32 V dc -
RS Stock No. 797-5009
BrandRS PRO
PHP10,874.41
Each
units
Gauge 0bar 6bar ±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. 102-4147
BrandRS PRO
PHP30,858.06
Each
units
Gauge -1bar 9bar ±0.25 % Analogue Grey Water, Sewage, Viscous Fluid BSP 3/4 4 20 mA M12 4-pin - - 28 mA 12 28 V dc -
RS Stock No. 175-5030
BrandRS PRO
PHP9,687.34
Each
units
Gauge -14.5psi 150psi ±0.25 % Analogue - NPT 1/4 4 20 mA M12 Connector - - 20 mA 9 32 V dc -
RS Stock No. 175-5031
BrandRS PRO
PHP9,687.34
Each
units
Gauge -14.5psi 150psi ±0.25 % Analogue - NPT 1/4 0 5 V M12 Connector - - - 9 32 V dc -
RS Stock No. 175-5035
BrandRS PRO
PHP9,687.34
Each
units
Gauge 0psi 15psi ±0.25 % Analogue - NPT 1/4 0 5 V M12 Connector - - - 9 32 V dc -
RS Stock No. 175-5036
BrandRS PRO
PHP8,627.71
Each
units
Gauge 0psi 30psi ±0.25 % Analogue - NPT 1/4 4 20 mA M12 Connector - - 20 mA 9 32 V dc -
RS Stock No. 828-5773
BrandRS PRO
PHP12,387.75
Each
units
Gauge 0bar 100bar <±0.25 % Current Sewage, Viscous Fluid, Water G3/4 4 20 mA M12 Connector - - 28 mA 9 32 V dc -
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