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. 797-5024
BrandRS PRO
$366.32
Each
units
Relative -1bar 9bar ±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. 123-6131
Mfr. Part No.251858
$114.19
Each
units
- 0.7bar 4.1bar ±0.1 bar SPST-NO Gas, Liquid BSP 1/4 - 1/4 x 1/32 Spade Terminal - - - - -
RS Stock No. 779-4279
Mfr. Part No.217464-RS
$265.86
Each
units
- 10psi 300psi - SPDT Air, Hydraulic BSP 1/4 - Screw Terminals - - 5 A - 125/250 V
RS Stock No. 124-2131
Mfr. Part No.XMLA160E2S11
$503.03
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. 820-7035
Mfr. Part No.6742-0052
BrandHerga
$113.99
Each
units
- 60psi 120psi ±10 % SPCO Air, Gas, Liquid, Oil BSP 1/8 - Spade Terminal - - 21 A - 220 V dc, 250 V ac
RS Stock No. 169-8093
Mfr. Part No.ADP51B61
BrandPanasonic
$18.265
Each (In a Tube of 100)
units
Relative - - ±2.5 % Amplified Air - 4 V PCB - - 10 mA - -
RS Stock No. 914-8390
Mfr. Part No.DP102EP
BrandPanasonic
$282.36
Each
units
Relative -1bar 10bar ±1 % Relay Non-Corrosive Gas G1/8 100 mA Wire Lead - 2.5 ms - - 12 → 24 V dc
RS Stock No. 774-4104
Mfr. Part No.SDP610-500Pa
BrandSensirion
$62.53
Each
units
Differential -500Pa 500Pa 3 % I2C Air, Non-Aggressive Gas - - 4 Pin SMD Connector - 4.6 ms 6 mA SDP600 2.7 → 3.3 V dc
RS Stock No. 124-2169
Mfr. Part No.XMPA06C2374N
$98.04
Each
units
Differential 1 (Rising)bar 6 (Rising)bar <3.5 (Repeat) % 3NC Air, Fresh Water, Sea Water G1/2 - Screw Clamp - - - - -
RS Stock No. 124-2124
Mfr. Part No.9013FHG2J27
BrandSquare D
$70.97
Each
units
Differential 40 (Rising)psi 100 (Rising)psi ±3 (Repeat) % 2NC Air 0.25 in NPSF - Screw Clamp - - - - -
RS Stock No. 739-6724
Mfr. Part No.PK7521
$334.53
Each
units
Relative 0bar 250bar <±2.5 % 2NO Gas, Liquid G1/4 - M12 Connector - - 500 mA - 9.6 → 32 V dc
RS Stock No. 746-3559
Mfr. Part No.A5074-TB-A1-CA-H1-PA 10.0 bar G
BrandDruck
$466.72
Each
units
Relative - 10bar ±0.2 % Analogue Fluid G1/4 0 → 5 V DIN 43650 Type A - 10 ms 3 mA - 7 → 16 V
RS Stock No. 374-8878
Mfr. Part No.787262
BrandBurkert
$61.06
Each
units
Differential 3bar 16bar - Relay Air, Hydraulic Fluid, Oil Emulsion, Water G1/4 - Spade Terminal - - - Type 1045 -
RS Stock No. 399-1612
Mfr. Part No.XMAV06L2135
$213.93
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. 125-1268
Mfr. Part No.PN7071
$617.61
Each
units
Relative 0bar 250bar ±0.5 % 2x PNP/NPN-NO/NC Fluid G1/4 - M12 Connector IO-LINK <3 (Minimum Switching Output) ms 150 mA @ +60 °C, 200 mA @ +60 °C, 250 mA @ +40 °C - 18 → 30 V dc
RS Stock No. 739-6774
Mfr. Part No.PBT-RB1X0SG1SSNAMA0Z
BrandSick
$213.18
Each
units
Relative 0bar 1bar ±0.5 % Analogue Fluid, Gas G1/4 4 → 20 mA M12 Connector - 4 ms 25 mA - 8 → 30 V dc
RS Stock No. 124-1486
Mfr. Part No.46882608
BrandWIKA
$333.63
Each
units
- 0bar 6bar 0.25 % Analogue Gas, Liquid G1/4 4 → 20 mA DIN 175301-803 A - < 3 ms - S-20 8 → 35 V dc
RS Stock No. 739-6780
Mfr. Part No.PBT-RB100SG1SSNAMA0Z
BrandSick
$213.18
Each
units
Relative 0bar 100bar ±0.5 % Analogue Fluid, Gas G1/4 4 → 20 mA M12 Connector - 4 ms 25 mA - 8 → 30 V dc
RS Stock No. 779-4257
Mfr. Part No.209957-RS
$134.74
Each
units
- 10psi 30psi - SPDT Air, Hydraulic NPT 1/4 - Screw Terminals - - 5 A - 125/250 V
RS Stock No. 836-9035
Mfr. Part No.ADP51B61
BrandPanasonic
$28.28
Each
units
Relative - - ±2.5 % Amplified Air - 4 V PCB - - 10 mA - -