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. 455-4674
Mfr. Part No.3100B0160S01B000
$223.63
Each
units
Gauge 0bar 160bar 0.25 % Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil G1/4 4 → 20 mA DIN 43650 Type A - 1 ms - - 8 → 30 V dc
RS Stock No. 397-1113
Mfr. Part No.6101-0002
BrandHerga
$57.34
Each
units
Differential 62.5mbar 500mbar - Relay Fluid - - - - - 20 mA - 250 V ac
RS Stock No. 455-4517
Mfr. Part No.22ISBGA1000ABUA001
$681.28
Each
units
- 0bar 1bar 0.25 % Analogue Gas, Petrochemical, Sewage G1/4 4 → 20 mA DIN 43650 Type A - - - - 7 → 35 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. 719-1080
Mfr. Part No.MPX5010DP
BrandNXP
$30.67
Each
units
- - - ±5 % Analogue Air, Fluid - 4.7 V PCB Mount - 1 ms - - 4.75 → 5.25 V dc
RS Stock No. 739-6721
Mfr. Part No.PK7524
$352.93
Each
units
Relative 0bar 10bar <±2.5 % PNP-2NO Gas, Liquid G1/4 - M12 Connector - - 500 mA - 9.6 → 32 V dc
RS Stock No. 752-2431
Mfr. Part No.9012GBW1
BrandSquare D
$504.61
Each
units
Differential 16psi 90psi ±0.1 → 1 % - Gas, Liquid Level NPT 1/4 - 12" NPT - - 10 A - 600 V
RS Stock No. 518-4412
BrandRS PRO
$223.12
Each
units
Relative 0bar 4bar ≤0.5 % Analogue Gas, Liquid G1/4 4 → 20 mA M12 Connector - ≤3 ms - - 10 → 30 V dc
RS Stock No. 836-9026
Mfr. Part No.ADP5160
BrandPanasonic
$66.94
Each
units
Relative - - ±1.25 % Amplified Air - 4.5 V PCB - - 10 mA - 5 V dc
RS Stock No. 836-8966
Mfr. Part No.ADP42510
BrandPanasonic
$31.29
Each
units
Relative - - ±0.3 % Voltage Air, Fluid - 100±40 mV PCB - - 1.5 mA - -
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. 922-7324
Mfr. Part No.MPX5010DP
BrandNXP
$23.265
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. 124-2124
Mfr. Part No.9013FHG2J27
BrandSquare D
$76.22
Each
units
Differential 40 (Rising)psi 100 (Rising)psi ±3 (Repeat) % 2NC Air 0.25 in NPSF - Screw Clamp - - - - -
RS Stock No. 828-5760
BrandRS PRO
$464.00
Each
units
Relative 0bar 2bar <±0.25 % Current Sewage, Viscous Fluid, Water G3/4 4 → 20 mA M12 Connector - - 28 mA - 9 → 32 V dc
RS Stock No. 448-8101
Mfr. Part No.0184458031-SS
BrandSuco
$248.12
Each
units
- 1bar 10bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine G1/4 - DIN 46350 Connector - - 4 A 0184 250 V
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. 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. 463-5717
Mfr. Part No.401001/000-459-405-523-20-601-61/000
BrandJumo
$374.29
Each
units
- 0bar 10bar 0.5 % - Hydraulic Fluid, Pneumatic Fluid G1/2 4 → 20 mA DIN 43650 Connector - - - - 10 → 30 V dc
RS Stock No. 169-8090
Mfr. Part No.ADP5160
BrandPanasonic
$45.617
Each (In a Tube of 100)
units
Relative - - ±1.25 % Amplified Air - 4.5 V PCB - - 10 mA - 5 V dc
RS Stock No. 779-4229
Mfr. Part No.PS61-60-4MGZ-A-SP
$60.71
Each
units
- 400psi 1100psi - SPST-NO Hydraulic BSP 1/4 - Spade Terminal - - 100 VA - 42 V dc