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. 518-4478
BrandRS PRO
$209.42
Each
units
Gauge 0bar 40bar ≤0.5 % Analogue Gas, Liquid G1/4 4 → 20 mA M12 Connector - ≤3 ms - 10 → 30 V dc -
RS Stock No. 123-5246
BrandRS PRO
$812.88
Each
units
Relative 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. 175-5025
BrandRS PRO
$358.01
Each
units
Relative 0psi 8psi ±0.25 % Analogue - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc -
RS Stock No. 175-5028
BrandRS PRO
$344.05
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. 175-5006
BrandRS PRO
$426.46
Each
units
Relative 0bar 50mbar ±0.25 % Analogue - G1/4 4 → 20 mA M12 Connector - - 20 mA 9 → 32 V dc -
RS Stock No. 102-4140
BrandRS PRO
$724.98
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. 175-5000
BrandRS PRO
$250.77
Each
units
Relative 0bar 400bar ±0.25 % Analogue - G1/4 0 → 5 V M12 4-pin - - - 9 → 32 V dc -
RS Stock No. 123-5247
BrandRS PRO
$812.88
Each
units
Relative 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. 797-5033
BrandRS PRO
$315.00
Each
units
Relative 0bar 40bar ±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. 175-5049
BrandRS PRO
$237.43
Each
units
Relative 0psi 3600psi ±0.25 % Analogue - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc -
RS Stock No. 175-5040
BrandRS PRO
$237.43
Each
units
Relative 0psi 100psi ±0.25 % Analogue - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA 9 → 32 V dc -
RS Stock No. 123-5238
BrandRS PRO
$802.68
Each
units
Relative 0bar 25bar ±0.25 % Analogue Air, Hydraulic Fluid, Liquid, Non-Aggressive Gas, Oil, Water G1/4 0 → 5 V, 4 → 20 mA Wireless - - - - -
RS Stock No. 828-5757
BrandRS PRO
$471.32
Each
units
Relative 0bar 500mbar <±0.25 % Current Sewage, Viscous Fluid, Water G3/4 4 → 20 mA M12 Connector - - 28 mA 9 → 32 V dc -
RS Stock No. 175-5047
BrandRS PRO
$237.43
Each
units
Relative 0psi 300psi ±0.25 % Analogue - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc -
RS Stock No. 175-5036
BrandRS PRO
$250.77
Each
units
Relative 0psi 30psi ±0.25 % Analogue - NPT 1/4 4 → 20 mA M12 Connector - - 20 mA 9 → 32 V dc -
RS Stock No. 175-5029
BrandRS PRO
$358.01
Each
units
Relative 0psi 15psi ±0.25 % Analogue - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc -
RS Stock No. 175-4992
BrandRS PRO
$237.43
Each
units
Relative 0bar 25bar ±0.25 % Analogue - G1/4 4 → 20 mA M12 4-pin - - 20 mA 9 → 32 V dc -
RS Stock No. 828-5811
BrandRS PRO
$419.18
Each
units
Relative -1bar 1bar <±0.25 % Current Sewage, Viscous Fluid, Water G3/4 4 → 20 mA M12 Connector - - 28 mA 9 → 32 V dc -
RS Stock No. 175-5032
BrandRS PRO
$266.59
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. 175-5041
BrandRS PRO
$239.07
Each
units
Relative 0psi 100psi ±0.25 % Analogue - NPT 1/4 0 → 5 V M12 Connector - - - 9 → 32 V dc -