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. 124-2128
Mfr. Part No.9013FSG2J24
BrandSquare D
SGD59.63
Each
units
Differential 15 (Approximate) psi, 20 (Rising) psi 30 (Approximate) psi, 65 (Rising) psi ±3 (Repeat) % 2NC Fresh Water 0.25 in NPSF - Screw Clamp - - - - -
RS Stock No. 535-1224
Mfr. Part No.5266250LBACTI
SGD286.19
Each
units
Differential -250Pa 250Pa ±1 % Analogue Air, Non-Conductive Gas - 0 → 10 V Terminal Strip - 1 s - 24 V ac/dc -
RS Stock No. 124-2125
Mfr. Part No.9013FSG2J20
BrandSquare D
SGD64.89
Each
units
Differential 15 (Approximate) psi, 20 (Rising) psi 30 (Approximate) psi, 65 (Rising) psi ±3 (Repeat) % 2NC Fresh Water 0.25 in NPSF - Screw Clamp - - - - -
RS Stock No. 922-7399
Mfr. Part No.MPXV5004DP
BrandNXP
SGD21.441
Each (In a Tray of 25)
units
Differential 0bar 3.92kPa ±1.5 % Analogue Air, Fluid - 1 → 4.9 V PCB Mount - - - 4.75 → 5.25 V dc -
RS Stock No. 896-8440
Mfr. Part No.3500B350MG01G000
SGD211.53
Each
units
Relative - 0.35bar 0.25 % Current Air, Gas, Water G1/4 4 → 20 mA DIN 43650 Type A - - - 10 → 30 V dc -
RS Stock No. 397-1135
Mfr. Part No.6101-0005
BrandHerga
SGD51.00
Each
units
Differential 25mbar 0.125bar - Relay Fluid - - - - - 20 mA 250 V ac -
RS Stock No. 455-4624
Mfr. Part No.3100B0010G01B000
SGD242.50
Each
units
Gauge 0bar 10bar 0.25 % Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil G1/4 4 → 20 mA DIN 43650 Type C - 1 ms - 10 → 30 V dc -
RS Stock No. 111-5919
Mfr. Part No.PX3AN2BS250PAAAX
BrandHoneywell
SGD86.48
Each
units
Absolute 0psi 250psi ±0.25 % Analogue Air, Brake Fluid, Hydraulic Fluid, Oil, Refrigeration Fluid NPT 1/8 0.5 → 4.5 V Metri-Pack 150 - <2 ms 3 mA 4.75 → 5.25 V dc -
RS Stock No. 821-3689
Mfr. Part No.83282-00000100-05
BrandHoneywell
SGD46.56
Each
units
- - - - - - - - - - - - - -
RS Stock No. 797-5015
BrandRS PRO
SGD305.05
Each
units
Relative 0bar 25bar ±0.25 % Current Air, Gas, Hydraulic Fluid, Liquid, Water G1/4 4 → 20 mA DIN 43650 Type C - - 20 mA 9 → 32 V dc -
RS Stock No. 779-4257
Mfr. Part No.209957-RS
SGD122.36
Each
units
- 10psi 30psi - SPDT Air, Hydraulic NPT 1/4 - Screw Terminals - - 5 A 125/250 V -
RS Stock No. 914-8356
Mfr. Part No.DP101AN
BrandPanasonic
SGD287.14
Each
units
Relative -1bar 1bar - Analogue + NPN-NO/NC Programmable Non-Corrosive Gas NPT 1/8 1 → 5 V dc, 4 → 20 mA Wire Lead - 5000 ms 100 mA 12 → 24 V dc -
RS Stock No. 173-2219
Mfr. Part No.SDP1000-L05
BrandSensirion
SGD115.815
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 -
RS Stock No. 609-7094
Mfr. Part No.XMPE12C2242
SGD99.34
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. 774-4097
Mfr. Part No.SDP1000-L05
BrandSensirion
SGD142.00
Each
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 -
RS Stock No. 535-1252
Mfr. Part No.526610CLBACTI
SGD286.19
Each
units
Differential -1000Pa 1000Pa ±1 % Analogue Air, Non-Conductive Gas - 0 → 10 V Terminal Strip - 1 s - 24 V ac/dc -
RS Stock No. 124-2131
Mfr. Part No.XMLA160E2S11
SGD456.17
Each
units
Differential 4.5 (Falling) bar, 10 (Rising) bar 142 (Falling) bar, 160 (Rising) bar <2 (Repeat) % 1CO Fresh Water G1/4 - Screw Clamp - - 3 A 240 V ac, 250 V dc -
RS Stock No. 124-2126
Mfr. Part No.9013FSG2J21
BrandSquare D
SGD53.72
Each
units
Differential 15 (Approximate) psi, 20 (Rising) psi 30 (Approximate) psi, 65 (Rising) psi ±3 (Repeat) % 2NC Fresh Water 0.25 in NPSF - Screw Clamp - - - - -
RS Stock No. 302-5838
Mfr. Part No.XMLA010A2S11
SGD253.31
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. 746-3449
Mfr. Part No.X5072-TB-A1-CA-H1-PA 250, mbar G
BrandDruck
SGD568.71
Each
units
Relative - 0.25bar ±0.2 % Analogue Fluid G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V -