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. 124-2170
Mfr. Part No.XMPA12B2131C
$73.46
Each
units
Differential 0.3 (Falling) bar, 1.3 (Rising) bar 10.3 (Falling) bar, 12 (Rising) bar <3.5 (Repeat) % 2NC Air, Fresh Water, Sea Water G1/4 - Screw Clamp - - - - -
RS Stock No. 772-9907
Mfr. Part No.XMPA12B2131
$87.18
Each
units
- - - - - - - - - - - - - -
RS Stock No. 124-2119
Mfr. Part No.9012GAW4
$808.86
Each
units
Differential 1.5 (Decreasing) psi, 3.5 (Differential) psi 7.5 (Decreasing) psi, 15 (Differential) 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. 124-2165
Mfr. Part No.XMPA06B2133NS1
$194.14
Each
units
Differential 1bar 6bar ±0.5 % 2 N/C - G1/4 - Screw Terminals - - - - -
RS Stock No. 124-2172
Mfr. Part No.XMPA12B2144C243
$134.48
Each
units
Differential 1.3bar 12bar ±0.5 % 2 N/C - G1/4 - Screw Terminals - - - - -
RS Stock No. 835-2848
Mfr. Part No.XMLR010G1P25
$603.60
Each
units
Differential 0bar 10bar ≤0.1 % Analogue, 1 x PNP Air, Fresh Water, Hydraulic Oil, Refrigerator Fluid G1/4 4 → 20 mA M12 Connector - ≤10 (Analogue) ms, ≤5 (Discrete) ms ≤50 mA 24 V dc -
RS Stock No. 302-5838
Mfr. Part No.XMLA010A2S11
$400.64
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. 124-2164
Mfr. Part No.XMPA06B2131C
$56.90
Each
units
Differential 0.2 (Falling) bar, 1 (Rising) bar 4.8 (Falling) bar, 6 (Rising) bar <3.5 (Repeat) % 2NC Air, Fresh Water, Sea Water G1/4 - Screw Clamp - - - - -
RS Stock No. 752-2440
Mfr. Part No.9012GBW2
$1,176.91
Each
units
Differential 27psi 130psi ±0.1 → 1 % - Gas, Liquid Level NPT 1/4 - 12" NPT - - 10 A 600 V -
RS Stock No. 124-2173
Mfr. Part No.XMPA12C2131C
$76.16
Each
units
Differential 0.3 (Falling) bar, 1.3 (Rising) bar 10.3 (Falling) bar, 12 (Rising) bar <3.5 (Repeat) % 3NC Air, Fresh Water, Sea Water G1/4 - Screw Clamp - - - - -
RS Stock No. 399-1612
Mfr. Part No.XMAV06L2135
$229.76
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. 124-2157
Mfr. Part No.XMLR100M2P05
$671.55
Each
units
Differential 5 (Falling) bar, 8 (Rising) bar 97 (Falling) bar, 100 (Rising) bar ≤0.2 (Repeat) %, ≤0.6 (Output) %, ≤1 (Overall) % PNP-2NO/NC Air, Fresh Water, Hydraulic Oil, Refrigerator Fluid G1/4 - M12 4-Pin Connector - ≤5 ms ≤50 mA 24 V dc -
RS Stock No. 124-2121
Mfr. Part No.9012GAW6
$951.07
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. 124-2133
Mfr. Part No.XMLP001GL71F
$238.54
Each
units
- 0bar 1bar ±0.1 (Repeat) %, ±0.5 (Measurement) % Analogue Air, Fresh Water, Gas, Hydraulic Oil G1/4 0 → 10 V Cable - ≤2 ms <7 mA 24 V dc -
RS Stock No. 302-5822
Mfr. Part No.XMLA004A2S11
$485.52
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. 835-2841
Mfr. Part No.XMLR010G2N05
$671.55
Each
units
Differential 0bar 10bar ≤0.1 % 2x NPN-NO/NC Air, Fresh Water, Hydraulic Oil, Refrigerator Fluid G1/4 - M12 Connector - ≤5 ms ≤50 mA 24 V dc -
RS Stock No. 124-2168
Mfr. Part No.XMPA06C2242
$180.10
Each
units
Differential 0.2 (Falling) bar, 1 (Rising) bar 4.8 (Falling) bar, 6 (Rising) bar <3.5 (Repeat) % 3NC Air, Fresh Water, Sea Water G3/8 - Screw Clamp - - - - -
RS Stock No. 752-2437
Mfr. Part No.9012GAW6
$1,001.29
Each
units
Differential 10psi 49psi ±0.1 → 1 % - Gas, Liquid Level NPT 1/4 - 12" NPT - - 10 A 600 V -
RS Stock No. 609-7094
Mfr. Part No.XMPE12C2242
$136.37
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. 124-2174
Mfr. Part No.XMPA12C2142
$219.65
Each
units
Differential 1.3bar 12bar ±0.5 % 3NC - G1/4 - Screw Terminals - - - - -