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 Series Supply Voltage
RS Stock No. 772-9907
Mfr. Part No.XMPA12B2131
$81.17
Each
units
- - - - - - - - - - - - - -
RS Stock No. 111-5920
Mfr. Part No.PX3AN2BS100PAAAX
BrandHoneywell
$95.36
Each
units
Absolute 0psi 100psi ±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. 361-3429
Mfr. Part No.XMLA300D2S12
$628.35
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. 124-2171
Mfr. Part No.XMPA12B2142
$106.84
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. 609-6934
Mfr. Part No.XMLA035A2S11
$335.07
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. 779-4204
Mfr. Part No.PS61-20-4MGZ-A-SP
$76.60
Each
units
- 40psi 150psi - SPST-NO Hydraulic BSP 1/4 - Spade Terminal - - 100 VA - 42 V dc
RS Stock No. 124-2170
Mfr. Part No.XMPA12B2131C
$68.40
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. 719-1080
Mfr. Part No.MPX5010DP
BrandNXP
$28.56
Each
units
- - - ±5 % Analogue Air, Fluid - 4.7 V PCB Mount - 1 ms - - 4.75 → 5.25 V dc
RS Stock No. 922-7324
Mfr. Part No.MPX5010DP
BrandNXP
$21.662
Each (In a Tray of 20)
units
Differential 0bar 10kPa ±5 % Analogue Air, Fluid - 4.7 V PCB Mount - 1 ms - - 4.75 → 5.25 V dc
RS Stock No. 455-4624
Mfr. Part No.3100B0010G01B000
$333.23
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. 324-0986
Mfr. Part No.XMLA300D2S11
$605.12
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. 111-5919
Mfr. Part No.PX3AN2BS250PAAAX
BrandHoneywell
$103.62
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. 779-4254
Mfr. Part No.211215-RS
$164.78
Each
units
- 65psi 300psi - SPDT Air, Hydraulic BSP 1/4 - Screw Terminals - - 5 A - 125/250 V
RS Stock No. 788-4925
Mfr. Part No.2SMPP-03
BrandOmron
$11.405
Each (In a Pack of 2)
units
Relative -50kPa 50kPa - Amplified Air - - PCB - - 200 μA - -
RS Stock No. 177-4881
Mfr. Part No.2SMPP-03
BrandOmron
$6.773
Each (In a Tube of 112)
units
- - - - - - - - - - - - - -
RS Stock No. 398-7045
Mfr. Part No.0166407031027
BrandSuco
$73.52
Each
units
- 1bar 10bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine G1/4 - Spade Terminal - - - 01664 42 V
RS Stock No. 748-4720
Mfr. Part No.ZSE40AF-01-T
BrandSMC
$334.68
Each
units
Vacuum -100kPa 100kPa ±0.2 % Analogue Gas BSP 1/8 1 → 5 V, 4 → 20 mA Wire Lead - 2.5 ms 45 mA - 12 → 24 V dc
RS Stock No. 655-8173
Mfr. Part No.26PCCF A2G
BrandHoneywell
$71.82
Each
units
Relative 0psi 15psi ±0.5 % Wheatstone Bridge Nitrogen Gas, Oxygen, Water - 100 mV dc PCB - 1 ms - - 10 V dc
RS Stock No. 169-7679
Mfr. Part No.26PCCFA2G
BrandHoneywell
$1,243.66
1 Box of 25
Box(es)
Relative 0psi 15psi ±0.25 % Wheatstone Bridge Nitrogen Gas, Oxygen - 0 → 100 mV PCB - 1 ms - - 2.5 → 16 V dc
RS Stock No. 795-4702
Mfr. Part No.3100B0009V01B000
$291.33
Each
units
Relative -1bar 9bar ±0.25 % Current Fluid, Gas G1/4 4 → 20 mA DIN 43650 Type A - 1 ms 20 mA - 8 → 30 V dc