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. 828-5760
BrandRS PRO
PHP12,387.75
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. 797-4964
BrandRS PRO
PHP10,367.32
Each
units
Gauge 0bar 16bar ±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. 175-5021
BrandRS PRO
PHP11,919.32
Each
units
Gauge 0psi 2psi ±0.25 % Analogue - NPT 1/4 0 5 V M12 Connector - - - 9 32 V dc -
RS Stock No. 102-4125
BrandRS PRO
PHP15,988.00
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. 123-5239
BrandRS PRO
PHP23,077.51
Each
units
Gauge 0bar 40bar ±0.25 % Analogue Air, Hydraulic Fluid, Liquid, Non-Aggressive Gas, Oil, Water G1/4 0 5 V, 4 20 mA Battery - - - - -
RS Stock No. 102-4152
BrandRS PRO
PHP23,296.96
Each
units
Absolute 0bar 10bar ±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. 828-5732
BrandRS PRO
PHP10,971.41
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 -
RS Stock No. 175-5018
BrandRS PRO
PHP14,774.21
Each
units
Gauge 0psi 1psi ±0.25 % Analogue - NPT 1/4 4 20 mA M12 Connector - - 20 mA 9 32 V dc -
RS Stock No. 797-4961
BrandRS PRO
PHP10,912.93
Each
units
Gauge -1bar 24bar ±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. 123-5251
BrandRS PRO
PHP48,851.49
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. 828-5791
BrandRS PRO
PHP12,387.75
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. 828-5745
BrandRS PRO
PHP7,792.87
Each
units
Gauge 0bar 16bar <±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. 797-5030
BrandRS PRO
PHP10,912.93
Each
units
Gauge 0bar 25bar ±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. 828-5779
BrandRS PRO
PHP12,387.75
Each
units
Gauge 0bar 50bar <±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
PHP20,634.43
Each
units
Gauge 0mbar 500mbar ±0.25 % Analogue Oil BSP 1/4 4 20 mA DIN 46350 Connector - - 28 mA 9 32 V dc -
RS Stock No. 123-5238
BrandRS PRO
PHP20,693.13
Each
units
Gauge 0bar 25bar ±0.25 % Analogue Air, Hydraulic Fluid, Liquid, Non-Aggressive Gas, Oil, Water G1/4 0 5 V, 4 20 mA Battery - - - - -
RS Stock No. 175-5044
BrandRS PRO
PHP8,225.39
Each
units
Sealed Gauge 0psi 1500psi ±0.25 % Analogue - NPT 1/4 4 20 mA M12 Connector - - 20 mA 9 32 V dc -
RS Stock No. 175-5036
BrandRS PRO
PHP8,225.39
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. 175-4993
BrandRS PRO
PHP8,225.39
Each
units
Gauge 0bar 25bar ±0.25 % Analogue - BSP 1/4 0 5 V DIN 43650 - - - 9 32 V dc -
RS Stock No. 175-5049
BrandRS PRO
PHP8,225.39
Each
units
Sealed Gauge 0psi 3600psi ±0.25 % Analogue - NPT 1/4 0 5 V M12 Connector - - - 9 32 V dc -
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