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 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 - Like 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. 609-6912
Mfr. Part No.XMLA002A2S11
TWD7,660.00
Each
units
Differential 0.15bar 2.5bar 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. 324-0992
Mfr. Part No.XMLB002A2S11
TWD6,875.00
Each
units
Differential 0.3bar 2.5bar 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. 324-1002
Mfr. Part No.XMLB004A2S11
TWD8,991.00
Each
units
Differential 0.25bar 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. 124-2160
Mfr. Part No.XMLR400M1P25
TWD12,477.00
Each
units
Differential 20 (Falling) bar, 32 (Rising) bar 388 (Falling) bar, 400 (Rising) bar ≤0.2 (Repeat) %, ≤0.6 (Output) %, ≤1 (Overall) % Analogue, PNP-NO/NC Air, Fresh Water, Hydraulic Oil, Refrigerator Fluid G1/4 4 → 20 mA M12 4-Pin Connector - ≤10 (Analogue) ms, ≤5 (Discrete) ms ≤50 mA 24 V dc -
RS Stock No. 399-1612
Mfr. Part No.XMAV06L2135
TWD2,664.00
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. 361-3435
Mfr. Part No.XMLA004A2S12
TWD4,816.00
Each
units
Differential 0.4bar 4bar 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. 361-3378
Mfr. Part No.XMLB004A2S12
TWD8,431.00
Each
units
Differential 0.25bar 4bar 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. 361-3457
Mfr. Part No.XMLA020A2S12
TWD5,438.00
Each
units
Differential 1bar 20bar 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. 324-0964
Mfr. Part No.XMLA160D2S11
TWD5,041.00
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. 772-9907
Mfr. Part No.XMPA12B2131
TWD1,289.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 124-2121
Mfr. Part No.9012GAW6
TWD12,307.00
Each
units
Differential 5 (Decreasing) psi, 10 (Differential) psi 49 (Differential) psi, 250 (Decreasing) psi <4 (Repeat) % SPDT-NO/NC Air, Hydraulic Oil, Non-Corrosive Gas, Non-Corrosive Liquids 0.25 in NPTF - 0.5 in NPT - - 6 A 240 V ac, 250 V dc -
RS Stock No. 199-399
Mfr. Part No.XMPA12C2131
TWD1,611.00
Each
units
Differential 1.3bar 12bar 3.5 % - Air, Fresh Water, Sea Water G1/4 - PG13.5 Cable Gland - - 1.5 A - -
RS Stock No. 135-3732
Mfr. Part No.XMLA020A2S13
TWD5,692.00
Each
units
- 0bar 20bar 2 % 1CO Air, Fresh Water, Hydraulic Oil, Sea Water - - 1/2 in 14 NPT - - 3 A @ 120 V ac, 100 mA @ 250 V dc 240 V ac, 250 V dc -
RS Stock No. 176-7874
Mfr. Part No.XMLP040BC290
TWD4,695.00
Each
units
- 0bar 40bar ±0.5 (Measurement) %, 0.1 % Analogue Air, Fresh Water, Gas, Hydraulic Oil, Refrigeration Fluid 7/16 - 20 UNF SAE 4 → 20 mA EN 175301-803-A 3 Pin Male Connector - ≤2 ms 23 mA 12 → 24 V dc -
RS Stock No. 324-0986
Mfr. Part No.XMLA300D2S11
TWD5,387.00
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. 135-3733
Mfr. Part No.XMLA035A2C11
TWD6,615.00
Each
units
- 0bar 35bar 2 % 1CO Air, Fresh Water, Hydraulic Oil, Sea Water - - DIN 43650A 4-Pin Male Connector - - 3 A @ 120 V ac, 100 mA @ 250 V dc 240 V ac, 250 V dc -
RS Stock No. 162-2091
Mfr. Part No.XMLP600BD21F
TWD4,714.00
Each
units
Differential 0bar 600bar ±0.5 % Analogue Air, Fresh Water, Gas, Hydraulic Oil, Refrigeration Fluid - 4 → 20 mA 4-Pin Male Connector - 2 ms 20 mA 12 → 24 V dc -
RS Stock No. 609-7022
Mfr. Part No.XMLB070D2S11
TWD9,595.00
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. 135-3734
Mfr. Part No.XMLA035B2S11
TWD9,613.00
Each
units
- 0bar 35bar 2 % 1CO Air, Fresh Water, Hydraulic Oil, Sea Water - - PG 13.5 - - 3 A @ 120 V ac, 100 mA @ 250 V dc 240 V ac, 250 V dc -
RS Stock No. 162-2093
Mfr. Part No.XMLPM09BD21F
TWD5,406.00
Each
units
Differential -1bar 9bar ±0.5 % Analogue Air, Fresh Water, Gas, Hydraulic Oil, Refrigeration Fluid - 4 → 20 mA 4-Pin Male Connector - 2 ms 20 mA 12 → 24 V dc -