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 different 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 - Similar to 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 Calibrated Process Connection Analogue Output Electrical Connection Communication Protocol Response Time Maximum Current Supply Voltage
RS Stock No. 123-5542
Mfr. Part No.3100B0010G01B000
£180.50
Each
Units
Gauge 0bar 10bar 0.25 % Analogue - RSCAL G1/4 4 → 20 mA DIN 43650 Type C - 1 ms - 10 → 30 V dc
RS Stock No. 455-4624
Mfr. Part No.3100B0010G01B000
£96.50
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. 772-9907
Mfr. Part No.XMPA12B2131
£32.00
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 398-7045
Mfr. Part No.0166407031027
BrandSuco
£23.95
Each
Units
- 1bar 10bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine - G1/4 - Spade Terminal - - - 42 V
RS Stock No. 797-5037
BrandRS PRO
£147.09
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. 123-5252
BrandRS PRO
£174.22
Each
Units
- - - ±0.25 % Analogue - - - 0 → 5 V, 4 → 20 mA Screw Terminals - - 5 A 12 → 32 V dc
RS Stock No. 797-4983
BrandRS PRO
£139.74
Each
Units
Relative 0bar 1bar ±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. 177-4881
Mfr. Part No.2SMPP-03
BrandOmron
£3.175
Each (In a Tube of 112)
Units
- - - - - - - - - - - - - -
RS Stock No. 788-4925
Mfr. Part No.2SMPP-03
BrandOmron
£4.79
Each (In a Pack of 2)
Units
Relative -50kPa 50kPa - Amplified Air - - - PCB - - 200 μA -
RS Stock No. 123-6659
Mfr. Part No.X5072-TB-A1-CA-H1-PA 16.0 bar G
BrandDruck
£253.00
Each
Units
Gauge - 16bar ±0.2 % Analogue Fluid RSCAL G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 746-3477
Mfr. Part No.X5072-TB-A1-CA-H1-PA 16.0 bar G
BrandDruck
£195.00
Each
Units
Relative - 16bar ±0.2 % Analogue Fluid - G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 746-3499
Mfr. Part No.X5072-TB-A1-CA-H1-PA 250 bar SG
BrandDruck
£253.89
Each
Units
Relative - 250bar ±0.2 % Analogue Fluid - G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 317-443
Mfr. Part No.6753-0002
BrandHerga
£28.55
Each
Units
- - 0.072psi ±2.5 % - Air - - - Spade Terminal - - - 250 V ac
RS Stock No. 797-0962
Mfr. Part No.31ISB0250S01R000
£114.10
Each
Units
Relative 0bar 250bar 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. 797-5018
BrandRS PRO
£139.74
Each
Units
Relative 0bar 10bar ±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. 746-3470
Mfr. Part No.X5072-TB-A1-CA-H1-PA 10.0 bar G
BrandDruck
£195.00
Each
Units
Relative - 10bar ±0.2 % Analogue Fluid - G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 123-6656
Mfr. Part No.X5072-TB-A1-CA-H1-PA 10.0 bar G
BrandDruck
£253.00
Each
Units
Gauge - 10bar ±0.2 % Analogue Fluid RSCAL G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 199-399
Mfr. Part No.XMPA12C2131
£36.00
Each
Units
Differential 1.3bar 12bar 3.5 % - Air, Fresh Water, Sea Water - G1/4 - PG13.5 Cable Gland - - 1.5 A -
RS Stock No. 395-7101
Mfr. Part No.2600BGA1019M3HA017
£362.50
Each
Units
Relative 0bar 0.5bar 0.25 % Amplified - - - 4 → 20 mA Wire Lead - 0.5 ms 20 mA 7 → 35 V dc
RS Stock No. 609-7094
Mfr. Part No.XMPE12C2242
£50.00
Each
Units
Differential 1.3bar 12bar 3.5 % - Air, Fresh Water, Sea Water - G3/8 - PG13.5 Cable Gland - - 1.5 A -
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