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. 169-8088
Mfr. Part No.ADP5161
BrandPanasonic
$45.628
Each (In a Tube of 100)
units
Relative - - ±1.25 % Amplified Air - 4.5 V PCB - - 10 mA - 5 V dc
RS Stock No. 797-5002
BrandRS PRO
$323.78
Each
units
Relative 0bar 400bar ±0.25 % Voltage Air, Gas, Hydraulic Fluid, Liquid, Water G1/4 0 → 100 mV DIN 43650 Type C - - - - 3 → 12 V dc
RS Stock No. 779-4235
Mfr. Part No.PS61-20-4MGZ-B-SP
$79.34
Each
units
- 40psi 150psi - SPST-NC Hydraulic BSP 1/4 - Spade Terminal - - 100 VA - 42 V dc
RS Stock No. 169-0724
Mfr. Part No.MPXV2202DPT1
BrandNXP
$23.855
Each (On a Reel of 100)
units
Differential 0bar 200kPa ±1 % Voltage Air - 38.5 → 41.5 mV PCB Mount - 1 ms 6 mA - 16 V dc
RS Stock No. 797-0959
Mfr. Part No.31ISB0060G01R000
$334.33
Each
units
Relative 0bar 60bar 0.25 % Analogue Fluid, Gas G1/4 4 → 20 mA DIN 43650 Type C - 1 ms 4.5 mA - 8 → 24 V dc
RS Stock No. 779-4260
Mfr. Part No.210114-RS
$139.43
Each
units
- 2000psi 5000psi - SPDT Air, Hydraulic NPT 1/4 - Screw Terminals - - 5 A - 125/250 V
RS Stock No. 317-948
Mfr. Part No.6761-0013
BrandHerga
$24.96
Each
units
Differential - 0.9psi - - - - - Spade Terminal - - - - 250 V ac
RS Stock No. 124-2173
Mfr. Part No.XMPA12C2131C
$76.18
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. 177-4881
Mfr. Part No.2SMPP-03
BrandOmron
$7.274
Each (In a Tube of 112)
units
- - - - - - - - - - - - - -
RS Stock No. 752-2377
Mfr. Part No.MPXV2202DPT1
BrandNXP
$27.23
Each
units
Differential 0bar 200kPa ±1 % Voltage Air - 38.5 → 41.5 mV PCB Mount - 1 ms 6 mA - 16 V dc
RS Stock No. 797-5037
BrandRS PRO
$367.76
Each
units
Relative 0bar 10bar ±0.25 % Voltage Air, Gas, Hydraulic Fluid, Liquid, Water G1/4 0 → 5 V DIN 43650 Type C - - - - 9 → 32 V dc
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. 779-4254
Mfr. Part No.211215-RS
$176.97
Each
units
- 65psi 300psi - SPDT Air, Hydraulic BSP 1/4 - Screw Terminals - - 5 A - 125/250 V
RS Stock No. 455-4624
Mfr. Part No.3100B0010G01B000
$357.89
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. 455-4696
Mfr. Part No.3100B0400S01B000
$256.60
Each
units
Gauge 0bar 400bar 0.25 % Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil G1/4 4 → 20 mA DIN 43650 Type C - 1 ms - - 8 → 30 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. 836-9017
Mfr. Part No.ADP5161
BrandPanasonic
$79.20
Each
units
Relative - - ±1.25 % Amplified Air - 4.5 V PCB - - 10 mA - 5 V dc
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. 124-2128
Mfr. Part No.9013FSG2J24
BrandSquare D
$69.91
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. 235-5891
Mfr. Part No.24PCGFM6G
BrandHoneywell
$67.17
Each
units
Gauge 0psi 250psi 0.2 % Unamplified Nitrogen Gas, Oxygen, Water - 145 → 280 mV Solder Tag - 1 ms - - 10 V dc