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. 609-7094
Mfr. Part No.XMPE12C2242
SGD100.99
Each
units
Differential 1.3bar 12bar 3.5 % - Air, Fresh Water, Sea Water G3/8 - PG13.5 Cable Gland - - 1.5 A - -
RS Stock No. 302-5838
Mfr. Part No.XMLA010A2S11
SGD259.74
Each
units
Differential 0.6bar 10bar 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 -
RS Stock No. 302-5844
Mfr. Part No.XMLA020A2S11
SGD256.91
Each
units
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 -
RS Stock No. 361-3687
Mfr. Part No.9012ADW7S1M12
SGD741.08
Each
units
Differential 38bar 340bar - - Fluid, Oil BSP 3/8 - PG13.5 Cable Gland - - 3 A dc, 5 A ac 120 240 V dc, 120 600 V ac -
RS Stock No. 609-7022
Mfr. Part No.XMLB070D2S11
SGD341.50
Each
units
Differential 7bar 70bar 2 % Relay Hydraulic Fluid G1/4 - PG13.5 Cable Gland - - 3 A ac, 100 mA dc 120 240 V ac, 250 V dc -
RS Stock No. 399-1612
Mfr. Part No.XMAV06L2135
SGD147.31
Each
units
Differential 1bar 6bar 3.5 % Relay Air, Fresh Water, Sea Water G1/4 - Screw Terminals - - 3 A ac, 100 mA dc 120 240 V ac, 250 V dc -
RS Stock No. 324-1018
Mfr. Part No.XMLB010A2S11
SGD301.86
Each
units
Differential 0.7bar 10bar 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 -
RS Stock No. 772-9907
Mfr. Part No.XMPA12B2131
SGD56.25
Each
units
- - - - - - - - - - - - - -
RS Stock No. 361-3384
Mfr. Part No.XMLB010A2S12
SGD301.86
Each
units
Differential 0.7bar 10bar 2 % Relay Air, Fresh Water, Hydraulic Fluid, Sea Water G1/4 - M20 Cable Gland - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc -
RS Stock No. 609-7044
Mfr. Part No.XMLB300D2S11
SGD316.25
Each
units
Differential 22bar 300bar 2 % Relay Hydraulic Fluid G1/4 - PG13.5 Cable Gland - - 3 A ac, 100 mA dc 120 240 V ac, 250 V dc -
RS Stock No. 361-3407
Mfr. Part No.XMLA070D2S12
SGD232.15
Each
units
Differential 50bar 70bar 2 % Relay Hydraulic Fluid G1/4 - M20 Cable Gland - - 3 A ac, 100 mA dc 120 240 V ac, 250 V dc -
RS Stock No. 609-6934
Mfr. Part No.XMLA035A2S11
SGD197.27
Each
units
Differential 1.5bar 35bar 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 -
RS Stock No. 324-1024
Mfr. Part No.XMLB020A2S11
SGD386.82
Each
units
Differential 1.3bar 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 -
RS Stock No. 324-0986
Mfr. Part No.XMLA300D2S11
SGD244.13
Each
units
Differential 20bar 300bar 2 % Relay Hydraulic Fluid G1/4 - PG13.5 Cable Gland - - 3 A ac, 100 mA dc 120 240 V ac, 250 V dc -
RS Stock No. 302-5822
Mfr. Part No.XMLA004A2S11
SGD217.94
Each
units
Differential 0.4bar 4bar 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 -
RS Stock No. 361-3441
Mfr. Part No.XMLA010A2S12
SGD210.61
Each
units
Differential 0.6bar 10bar 2 % Relay Air, Fresh Water, Hydraulic Fluid, Sea Water G1/4 - M20 Cable Gland - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc -
RS Stock No. 609-6928
Mfr. Part No.XMLA010A2C11
SGD220.09
Each
units
Differential 0.6bar 10bar 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 -
RS Stock No. 361-3564
Mfr. Part No.9012ADW4M11
SGD585.24
Each
units
Differential 27.6bar 206.7bar - Relay Diesel Oil, Hydraulic Fluid, Oil BSP 3/8 - PG13.5 Cable Gland - - 3 A dc, 5 A ac 120 240 V dc, 120 600 V ac -
RS Stock No. 324-0964
Mfr. Part No.XMLA160D2S11
SGD234.42
Each
units
Differential 10bar 160bar 2 % Relay Hydraulic Fluid G1/4 - PG13.5 Cable Gland - - 3 A ac, 100 mA dc 120 240 V ac, 250 V dc -
RS Stock No. 361-3429
Mfr. Part No.XMLA300D2S12
SGD234.42
Each
units
Differential 20bar 300bar 2 % Relay Hydraulic Fluid G1/4 - M20 Cable Gland - - 3 A ac, 100 mA dc 120 240 V ac, 250 V dc -