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. 821-3689
Mfr. Part No.83282-00000100-05
BrandHoneywell
R 719.47
Each
units
- - - - - - - - - - - - - -
RS stock no. 324-0986
Mfr. Part No.XMLA300D2S11
R 3,762.10
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. 455-4624
Mfr. Part No.3100B0010G01B000
R 2,694.42
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. 836-9004
Mfr. Part No.ADP51A11
BrandPanasonic
R 300.35
Each
units
Relative - - ±4 % Amplified Air - - 2.4 V PCB - - 3 mA 5 V dc
RS stock no. 177-4880
Mfr. Part No.2SMPP-02
BrandOmron
R 60.118
Each (In a Tube of 112)
units
- - - - - - - - - - - - - -
RS stock no. 788-4921
Mfr. Part No.2SMPP-02
BrandOmron
R 102.00
Each (In a Pack of 2)
units
Relative 0bar 37kPa - Amplified Air - - - PCB - - 130 μA -
RS stock no. 169-8087
Mfr. Part No.ADP51A11
BrandPanasonic
R 190.431
Each (In a Tube of 100)
units
Relative - - ±4 % Amplified Air - - 2.4 V PCB - - 3 mA 5 V dc
RS stock no. 124-2169
Mfr. Part No.XMPA06C2374N
R 1,019.70
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. 324-0964
Mfr. Part No.XMLA160D2S11
R 3,315.24
Each
units
Differential 10bar 160bar 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. 235-5891
Mfr. Part No.24PCGFM6G
BrandHoneywell
R 513.03
Each
units
Gauge 0psi 250psi 0.2 % Unamplified Nitrogen Gas, Oxygen, Water - - 145 → 280 mV Solder Tag - 1 ms - 10 V dc
RS stock no. 788-4925
Mfr. Part No.2SMPP-03
BrandOmron
R 120.315
Each (In a Pack of 2)
units
Relative -50kPa 50kPa - Amplified Air - - - PCB - - 200 μA -
RS stock no. 398-7045
Mfr. Part No.0166407031027
BrandSuco
R 851.82
Each
units
- 1bar 10bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine - G1/4 - Spade Terminal - - - 42 V
RS stock no. 177-4881
Mfr. Part No.2SMPP-03
BrandOmron
R 75.39
Each (In a Tube of 112)
units
- - - - - - - - - - - - - -
RS stock no. 922-7327
Mfr. Part No.MPX4250AP
BrandNXP
R 251.117
Each (In a Tray of 20)
units
Absolute 20kPa 250kPa ±1.5 % Analogue Air - - 4.9 V PCB Mount - 1 ms - 4.85 → 5.35 V dc
RS stock no. 835-3876
Mfr. Part No.PG2489
R 8,860.52
Each
units
Relative -5mbar 0.1bar ±0.6 % Analogue + PNP-NO/NC Programmable Gas, Liquid - G1/2 4 → 20 mA M12 Connector - 9 ms, 28 ms 250 mA 18 → 32 V dc
RS stock no. 795-4737
Mfr. Part No.3100B0010G05G000
R 2,285.64
Each
units
Gauge 0bar 10bar ±0.25 % Current Fluid, Gas - G1/4 4 → 20 mA DIN 43650 Type A - 1 ms 20 mA 8 → 30 V dc
RS stock no. 828-5729
BrandRS PRO
R 3,530.47
Each
units
Relative 0bar 500mbar <±0.25 % Current Oil, Water - G1/4 4 → 20 mA DIN 43650 Type A - - 28 mA 9 → 32 V dc
RS stock no. 124-2126
Mfr. Part No.9013FSG2J21
BrandSquare D
R 1,172.64
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. 124-2171
Mfr. Part No.XMPA12B2142
R 1,244.39
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. 719-1030
Mfr. Part No.MPX2010GP
BrandNXP
R 372.48
Each
units
Relative 0bar 10kPa ±1 % - Air - - 24 → 26 mV PCB Mount - 1 ms - 10 V dc