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. 739-6721
Mfr. Part No.PK7524
SGD276.31
Each
units
Relative 0bar 10bar <±2.5 % PNP-2NO Gas, Liquid G1/4 - M12 Connector - - 500 mA 9.6 → 32 V dc -
RS Stock No. 835-3939
Mfr. Part No.PU5414
SGD173.97
Each
units
Relative 0bar 16bar ±0.5 % Analogue Gas G1/4 0 → 10 V M12 Connector - 1 ms - 16 → 36 V dc -
RS Stock No. 835-3920
Mfr. Part No.PU5402
SGD173.97
Each
units
Relative 0bar 100bar ±0.5 % Analogue Gas, Liquid G1/4 0 → 10 V M12 Connector - 1 ms - 16 → 36 V dc -
RS Stock No. 125-1270
Mfr. Part No.PN7093
SGD510.12
Each
units
Relative 0bar 25bar ±0.5 % 2x PNP/NPN-NO/NC Fluid G1/4 - M12 Connector IO-LINK <3 (Minimum Switching Output) ms 150 mA @ +60 °C, 200 mA @ +60 °C, 250 mA @ +40 °C 18 → 30 V dc IO-Link
RS Stock No. 835-3927
Mfr. Part No.PU5404
SGD173.97
Each
units
Relative 0bar 10bar ±0.5 % Analogue Gas, Liquid G1/4 0 → 10 V M12 Connector - 1 ms - 16 → 36 V dc -
RS Stock No. 835-3866
Mfr. Part No.PG2455
SGD638.82
Each
units
Relative -1bar 4bar ±0.5 % Analogue + PNP-NO/NC Programmable Gas, Liquid G1/2 4 → 20 mA M12 Connector - 9 ms, 28 ms 250 mA 18 → 32 V dc -
RS Stock No. 835-3933
Mfr. Part No.PU5415
SGD173.97
Each
units
Relative 0bar 6bar ±0.5 % Analogue Gas, Liquid G1/4 0 → 10 V M12 Connector - 1 ms - 16 → 36 V dc -
RS Stock No. 835-3908
Mfr. Part No.PT5414
SGD173.97
Each
units
Relative 0bar 16bar ±0.5 % Analogue Gas, Liquid G1/4 4 → 20 mA M12 Connector - 1 ms - 8.5 → 36 V dc -
RS Stock No. 835-3857
Mfr. Part No.PG2451
SGD638.82
Each
units
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 -
RS Stock No. 125-1283
Mfr. Part No.PN2094
SGD608.12
Each
units
Relative -1bar 10bar <±0.4 % Analogue + PNP-NO/NC Programmable Fluid G1/4 0 → 10 V, 4 → 20 mA M12 Connector IO-LINK <1.5 (Minimum Switching Output) ms, <3 (Maximum Analogue Output) ms 250 mA 18 → 30 V dc IO-Link
RS Stock No. 835-3850
Mfr. Part No.PG2452
SGD638.82
Each
units
Relative 0bar 100bar ±0.5 % Analogue + PNP-NO/NC Programmable Gas, Liquid G1/2 4 → 20 mA M12 Connector - 9 ms, 28 ms 250 mA 18 → 32 V dc -
RS Stock No. 125-1285
Mfr. Part No.PN2097
SGD626.33
Each
units
Relative -0.05bar 1bar <±0.4 % Analogue + PNP-NO/NC Programmable Fluid G1/4 0 → 10 V, 4 → 20 mA M12 Connector IO-LINK <1.5 (Minimum Switching Output) ms, <3 (Maximum Analogue Output) ms 250 mA 18 → 30 V dc IO-Link
RS Stock No. 835-3914
Mfr. Part No.PT5460
SGD179.00
Each
units
Relative 0bar 600bar ±0.5 % Analogue Gas, Liquid G1/4 4 → 20 mA M12 Connector - 1 ms - 8.5 → 36 V dc -
RS Stock No. 835-3885
Mfr. Part No.PT5400
SGD179.00
Each
units
Relative 0bar 400bar ±0.5 % Analogue Gas, Liquid G1/4 4 → 20 mA M12 Connector - 1 ms - 8.5 → 36 V dc -
RS Stock No. 125-1322
Mfr. Part No.PN2598
SGD632.40
Each
units
Relative -12.5mbar 0.25bar <±0.4 % Analogue + PNP-NO/NC Programmable Fluid G1/4 0 → 10 V, 4 → 20 mA M12 Connector IO-LINK <1.5 (Minimum Switching Output) ms, <3 (Maximum Analogue Output) ms 250 mA 18 → 30 V dc IO-Link
RS Stock No. 125-1314
Mfr. Part No.PN2560
SGD632.40
Each
units
Relative 0bar 600bar <±0.4 % Analogue + PNP-NO/NC Programmable Fluid G1/4 0 → 10 V, 4 → 20 mA M12 Connector IO-LINK <1.5 (Minimum Switching Output) ms, <3 (Maximum Analogue Output) ms 250 mA 18 → 30 V dc IO-Link
RS Stock No. 125-1306
Mfr. Part No.PN3596
SGD592.68
Each
units
Relative 0bar 2.5bar ±0.5 % Analogue + PNP-NO/NC Programmable Fluid G1/4 0 → 10 V, 4 → 20 mA M12 Connector IO-LINK <3 (Maximum Analogue Output) ms, <3 (Minimum Switching Output) ms 150 mA @ +60 °C, 200 mA @ +60 °C, 250 mA @ +40 °C 18 → 30 V dc IO-Link
RS Stock No. 125-1274
Mfr. Part No.PN3071
SGD586.78
Each
units
Relative 0bar 250bar ±0.5 % Analogue + PNP-NO/NC Programmable Fluid G1/4 0 → 10 V, 4 → 20 mA M12 Connector IO-LINK <3 (Maximum Analogue Output) ms, <3 (Minimum Switching Output) ms 150 mA @ +60 °C, 200 mA @ +60 °C, 250 mA @ +40 °C 18 → 30 V dc IO-Link
RS Stock No. 125-1296
Mfr. Part No.PN7599
SGD530.59
Each
units
Relative -1bar 1bar ±0.5 % 2x PNP/NPN-NO/NC Fluid G1/4 - M12 Connector IO-LINK <3 (Minimum Switching Output) ms 150 mA @ +60 °C, 200 mA @ +60 °C, 250 mA @ +40 °C 18 → 30 V dc IO-Link
RS Stock No. 125-1303
Mfr. Part No.PN3592
SGD592.68
Each
units
Relative 0bar 100bar ±0.5 % Analogue + PNP-NO/NC Programmable Fluid G1/4 0 → 10 V, 4 → 20 mA M12 Connector IO-LINK <3 (Maximum Analogue Output) ms, <3 (Minimum Switching Output) ms 150 mA @ +60 °C, 200 mA @ +60 °C, 250 mA @ +40 °C 18 → 30 V dc IO-Link