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. 146-2909
Mfr. Part No.XMEP100BD71F
MYR773.19
Each
units
Differential - 300bar 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. 124-2176
Mfr. Part No.XMPC06C2374
MYR263.87
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 G1/2 - Screw Clamp - - - - -
RS Stock No. 197-6888
Mfr. Part No.MPRLS0001PG00001C
BrandHoneywell
MYR40.22
Each
units
Absolute 0psi 1psi ±0.25 %FSS BFSL Transistor Gas, Liquid - - - - - - 3.6 V I2C
RS Stock No. 200-6107
Mfr. Part No.86-015G-C
MYR287.42
Each
units
- - - - - - - - - - - - - -
RS Stock No. 324-0958
Mfr. Part No.XMLA070D2S11
MYR826.37
Each
units
Differential 50bar 70bar 2 % Relay Hydraulic Fluid G1/4 - PG13.5 Cable Gland - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc -
New
RS Stock No. 206-7026
Mfr. Part No.PP - 222 2H2
BrandVega
MYR1,778.45
Each
units
Relative -1bar 60bar 0.3 % Analogue Gas, Vapour - - - - - - 35 V IO-Link
RS Stock No. 176-7930
Mfr. Part No.XMLP600PP230
MYR813.78
Each
units
- 0psi 600psi 0.1 %, ±0.5 (Measurement) % Analogue Air, Fresh Water, Gas, Hydraulic Oil, Refrigeration Fluid - 4 → 20 mA 3 Pin Male Connector - ≤2 ms 23 mA 12 → 24 V dc -
RS Stock No. 719-1018
Mfr. Part No.MPVZ4006GW7U
BrandNXP
MYR55.81
Each
units
Relative 0bar 6kPa ±2.46 % Analogue Air - 4.6 V PCB Mount - - - 4.75 → 5.25 V dc -
RS Stock No. 361-3384
Mfr. Part No.XMLB010A2S12
MYR1,025.24
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. 146-5287
Mfr. Part No.XMLP600BD71F
MYR600.25
Each
units
Differential - 1500bar ±0.5 % Analogue Air, Fresh Water, Gas, Hydraulic Oil, Refrigeration Fluid G1/4 0 → 10 V 4-Pin M12 Male Connector - ≤2 ms <7 mA 24 V dc -
RS Stock No. 202-3535
Mfr. Part No.MLH01KPSB06A
BrandHoneywell
MYR761.15
Each
units
Sealed Gauge 50psi 1000psi ±0.25 % Analogue - NPT 1/8 - - - - - 24 V -
RS Stock No. 200-6129
Mfr. Part No.MS583730BA01-50
MYR21.342
Each (On a Reel of 5000)
units
- - - - - - - - - - - - - -
RS Stock No. 511-7399
Mfr. Part No.6101-0032
BrandHerga
MYR182.53
Each
units
Differential 3.73mbar 4.98mbar - - Air - - - - - - 125 V ac -
RS Stock No. 361-3429
Mfr. Part No.XMLA300D2S12
MYR789.84
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 -
RS Stock No. 455-5166
Mfr. Part No.SDX01D4
BrandHoneywell
MYR417.32
Each
units
Differential 0psi 1psi ±0.2 % Unamplified Gas - 17.37 → 18.18 mV PCB - 100 μs - 20 V dc -
RS Stock No. 173-2219
Mfr. Part No.SDP1000-L05
BrandSensirion
MYR337.65
Each (In a Tray of 25)
units
Differential -5Pa 125Pa 0.3 %, 2 % Analogue Air, Non-Aggressive Gas - 0.25 → 4 V 3 Pin SMD Connector - 40 ms 5.2 mA 4.75 → 5.25 V -
New
RS Stock No. 205-1270
Mfr. Part No.46967534
BrandWIKA
MYR566.20
Each
units
Absolute 0bar 40bar 1 % PNP Air, Fluids, Gases - - - - - - 10 → 32 V IO-Link
RS Stock No. 125-1316
Mfr. Part No.PN2571
MYR2,087.00
Each
units
Relative 0bar 250bar <±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. 146-5273
Mfr. Part No.XMLP016BC71F
MYR619.45
Each
units
Differential - 48bar ±0.5 % Analogue Air, Fresh Water, Gas, Hydraulic Oil, Refrigeration Fluid G1/4 0 → 10 V 3-Pin EN 175301-803-A Male Connector - ≤2 ms <7 mA 24 V dc -
RS Stock No. 179-9888
Mfr. Part No.XMLK006B2C21
MYR612.78
Each
units
Differential - - ±1 % Analogue Fluid G1/4 4 → 20 mA EN 175301-803-A Male Connector - 5 ms 20 mA 24 V dc -