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. 181-1356
Mfr. Part No.24PCBFA2G
BrandHoneywell
$61.67
Each
units
Relative 0psi 5psi 0.2 % Wheatstone Bridge Nitrogen Gas, Oxygen, Water - 0 → 115 mV Solder Tag - 1 ms - 2.5 → 12 V dc -
RS Stock No. 199-3838
Mfr. Part No.PM620TS-10A
BrandDruck
$4,743.42
Each
units
Absolute 1.2bar 100bar - - - - - - - - - - -
New
RS Stock No. 205-1271
Mfr. Part No.46967537
BrandWIKA
$196.65
Each
units
Absolute 0bar 100bar 1 % PNP Air, Fluids, Gases - - - - - - 10 → 32 V IO-Link
RS Stock No. 146-2912
Mfr. Part No.XMEP250BD71F
$242.30
Each
units
Differential - 750bar 0.1 % Analogue Air, Fresh Water, Hydraulic Oil G1/4 0 → 10 V 4-Pin M12 Male Connector - ≤2 ms <7 mA 24 V dc -
RS Stock No. 313-7010
Mfr. Part No.6731-0027
BrandHerga
$46.94
Each
units
- 0.72psi 1.8psi - Relay - - - Spade Terminal - - - 250 V ac -
New
RS Stock No. 197-6893
Mfr. Part No.MPRLS0015PA0000SA
BrandHoneywell
$12.91
Each
units
Absolute 0psi 15psi ±0.25 %FSS BFSL Transistor Gas, Liquid - - - - - - 3.6 V I2C
RS Stock No. 136-5095
Mfr. Part No.3200B0600S05GR00
$220.57
Each
units
Relative 0bar 600bar 0.5 % Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil G1/4 4 → 20 mA Large DIN Connector - 1 ms 2 (Sink & Source) mA 8 → 30 V dc -
RS Stock No. 286-658
Mfr. Part No.26PCBFA6G
BrandHoneywell
$59.15
Each
units
Gauge 0psi 5psi ±0.25 % Unamplified Nitrogen Gas, Oxygen - 47 → 53 mV PCB - 1 ms - 10 V dc -
RS Stock No. 136-5079
Mfr. Part No.3200B0160S05BR00
$215.22
Each
units
Relative 0bar 160bar - Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil G1/4 4 → 20 mA 9.4 mm DIN Connector - 1 ms 2 (Sink & Source) mA 8 → 30 V dc -
RS Stock No. 235-5762
Mfr. Part No.24PCEFA6G
BrandHoneywell
$60.76
Each
units
Gauge 0psi 0.5psi 0.2 % Unamplified Nitrogen Gas, Oxygen, Water - 25 → 45 mV Solder Tag - 1 ms - 10 V dc -
RS Stock No. 179-9892
Mfr. Part No.XMLK016B2D71
$288.75
Each
units
Differential - - ±1 % Analogue Fluid G1/4 0 → 10 V M12 Male Connector - 5 ms 6 mA 24 V dc -
RS Stock No. 135-0301
Mfr. Part No.BSP B400-EV002-A02S1B-S4
BrandBALLUFF
$529.10
Each
units
- 0bar 400bar ±0.2 (Repeat) % PNP - G1/4 4 → 20 mA 4-Pin M12 Connector IO-LINK - 250 mA 18 → 36 V dc IO-Link
RS Stock No. 125-1311
Mfr. Part No.PN2098
$813.33
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. 124-2154
Mfr. Part No.XMLR016G0T25
$647.81
Each
units
- 0bar 16bar ≤1 % Analogue Air, Fresh Water, Hydraulic Oil, Refrigeration Fluid G1/4 4 → 20 mA M12 Male 4-Pin Connector - ≤10 ms ≤50 mA 24 V dc -
New
RS Stock No. 197-6892
Mfr. Part No.MPRLS0015PA0000SA
BrandHoneywell
$6.928
Each (On a Reel of 160)
units
Absolute 0psi 15psi ±0.25 %FSS BFSL Transistor Gas, Liquid - - - - - - 3.6 V I2C
RS Stock No. 136-5094
Mfr. Part No.3200B0400S05GR00
$220.57
Each
units
Relative 0bar 400bar - Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil G1/4 4 → 20 mA Large DIN Connector - 1 ms 2 (Sink & Source) mA 8 → 30 V dc -
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