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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Beskrivning Pris Pressure Reading Type Minimum Pressure Reading Maximum Pressure Reading Accuracy Output Type Media Measured Calibrated Process Connection Analogue Output Electrical Connection Communication Protocol Response Time Maximum Current Supply Voltage
RS-artikelnummer 853-6462
Tillv. art.nrPX2AG2XX002BAAAX
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Absolute 0bar 2bar ±0.25 % Analogue Air, Brake Fluid, Hydraulic Fluid, Oil, Refrigeration Fluid - G1/8 0.5 → 4.5 V Metri-Pack 150 - <2 ms 5 mA 4.75 → 5.25 V dc
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Differential 0.07bar 2.75bar - Relay Fluid - - - - - - 5 A 250 V ac
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Tillv. art.nrPU5401
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Relative 0bar 250bar ±0.5 % Analogue Gas, Liquid - G1/4 0 10 V M12 Connector - 1 ms - 16 36 V dc
RS-artikelnummer 317-443
Tillv. art.nr6753-0002
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- - 0.072psi ±2.5 % - Air - - - Spade Terminal - - - 250 V ac
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Tillv. art.nrPSE541-R06
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Negative Pressure 0kPa -101kPa ±2 % Analogue Air, Gas - - 0.6 1 V, 1 5 V ZS-28-C Connector - - 15 mA 12 24 V dc
RS-artikelnummer 410-6231
Tillv. art.nr404304/000-414-406-02-298
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Differential, Gauge 0mbar 100mbar - Analogue Non-Aggressive Gas - - 4 → 20 mA M12 Connector - - - 230 V ac
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Tillv. art.nrXMPA12B2131
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RS-artikelnummer 896-8500
Tillv. art.nr3500B0004A01G000
VarumärkeGems Sensors
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Absolute - 4bar 0.25 % Current Air, Gas, Water - G1/4 4 20 mA DIN 43650 Type A - - - 10 30 V dc
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Relative 0bar 250bar ±0.6 % Analogue + PNP-NO/NC Programmable Gas, Liquid - G1/2 4 20 mA M12 Connector - 9 ms, 28 ms 250 mA 18 32 V dc
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Tillv. art.nr5266500LBACTI
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Differential -500Pa 500Pa ±1 % Analogue Air, Non-Conductive Gas - - 0 → 10 V Terminal Strip - 1 s - 24 V ac/dc
RS-artikelnummer 463-5559
Tillv. art.nr404366/000-491-405-504-20-61/000
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Absolute 0bar 4bar 0.5 % Analogue - - G1/2 4 20 mA DIN 43650 Connector - - - 10 30 V dc
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Tillv. art.nr6761-0013
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Differential - 0.9psi - - - - - - Spade Terminal - - - 250 V ac
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Tillv. art.nr6101-0004
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Differential 0.07bar 2.75bar - Relay Fluid - - - - - - 5 A 250 V ac
RS-artikelnummer 398-7045
Tillv. art.nr0166407031027
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- 1bar 10bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine - G1/4 - Spade Terminal - - - 42 V
RS-artikelnummer 896-8487
Tillv. art.nr3500B0010A01B000
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Absolute - 10bar 0.25 % Current Air, Gas, Water - G1/4 4 20 mA DIN 43650 Type C - - - 10 30 V dc
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Differential 1bar 20bar 2 % Relay Air, Fresh Water, Hydraulic Fluid, Sea Water - G1/4 - PG13.5 Cable Gland - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc
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Tillv. art.nrX5072-TB-A1-CA-H1-PA 250, mbar G
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Gauge - 250mbar ±0.2 % Analogue Fluid RSCAL G1/4 4 20 mA DIN 43650 Type A - 10 ms 20 mA 7 28 V
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Tillv. art.nrX5072-TB-A1-CA-H1-PA 250, mbar G
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Gauge - 250mbar ±0.2 % Analogue Fluid - G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
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Absolute - 16bar 0.25 % Current Air, Gas, Water - G1/4 4 20 mA DIN 43650 Type C - - - 10 30 V dc
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