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 Process Connection Analogue Output Electrical Connection Communication Protocol Response Time Maximum Current Supply Voltage Interface
RS Stock No. 397-1191
Mfr. Part No.6101-0013
BrandHerga
MYR237.26
Each
units
Differential 0.7bar 16bar - Relay Fluid - - - - - 5 A 250 V ac -
RS Stock No. 922-7327
Mfr. Part No.MPX4250AP
BrandNXP
MYR61.292
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. 788-4921
Mfr. Part No.2SMPP-02
BrandOmron
MYR22.97
Each (In a Pack of 2)
units
Relative 0bar 37kPa - Amplified Air - - PCB - - 130 μA - -
RS Stock No. 772-9907
Mfr. Part No.XMPA12B2131
MYR200.93
Each
units
- - - - - - - - - - - - - -
RS Stock No. 124-1467
Mfr. Part No.46879447
BrandWIKA
MYR2,526.11
Each
units
- 0psi 14.22psi 0.5 % Analogue Liquid - 4 → 20 mA PUR Cable (15 metres) - - - 10 → 30 V dc -
RS Stock No. 313-5301
Mfr. Part No.14X1SA1GV1
BrandVega
MYR1,278.02
Each
units
Relative 0bar 0.1bar 0.3 % - Fluid, Gas, Vapour G1/2 4 → 20 mA DIN 43650 Connector - - - 12 → 36 V dc -
RS Stock No. 235-5790
Mfr. Part No.24PCAFA6D
BrandHoneywell
MYR147.04
Each
units
Differential 0psi 1psi ±0.25 % Unamplified Nitrogen Gas, Oxygen, Water - 30 → 60 mV Solder Tag - 1 ms - 10 V dc -
RS Stock No. 896-8418
Mfr. Part No.3500B350MG01B000
MYR645.69
Each
units
Relative - 0.35bar 0.25 % Current Air, Gas, Water G1/4 4 → 20 mA DIN 43650 Type C - - - 10 → 30 V dc -
RS Stock No. 395-7101
Mfr. Part No.2600BGA1019M3HA017
MYR2,443.37
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. 124-1464
Mfr. Part No.46879445
BrandWIKA
MYR2,526.11
Each
units
- 0psi 8.5psi 0.5 % Analogue Liquid - 4 → 20 mA PUR Cable (15 metres) - - - 10 → 30 V dc -
RS Stock No. 361-3441
Mfr. Part No.XMLA010A2S12
MYR694.48
Each
units
Differential 0.6bar 10bar 2 % Relay Air, Fresh Water, Hydraulic Fluid, Sea Water G1/4 - M20 Cable Gland - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc -
RS Stock No. 177-4880
Mfr. Part No.2SMPP-02
BrandOmron
MYR12.84
Each (In a Tube of 112)
units
- - - - - - - - - - - - - -
RS Stock No. 102-4125
BrandRS PRO
MYR1,360.75
Each
units
Relative -1bar 9bar ±0.25 % Analogue Gas, Liquid G1/4 4 → 20 mA DIN 43650 Type A - - - 9 → 32 V dc -
RS Stock No. 795-4702
Mfr. Part No.3100B0009V01B000
MYR643.68
Each
units
Relative -1bar 9bar ±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. 448-8022
Mfr. Part No.5000BGN3500M3005A001
MYR2,946.20
Each
units
Relative 201mbar 0.35bar 0.2 % - - G1/4 4 → 20 mA Wire Lead - 5 ms - 9 → 35 V dc -
RS Stock No. 455-4630
Mfr. Part No.3100B0016G01B000
MYR643.68
Each
units
Gauge 0bar 16bar 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. 448-8038
Mfr. Part No.5000BGA1000M3007A001
MYR2,987.99
Each
units
Gauge 351mbar 1bar 0.2 % Analogue Water/Diesel/Fuel Oil G1/4 4 → 20 mA Wire Lead - 5 ms 20 mA 9 → 35 V dc -
RS Stock No. 609-6962
Mfr. Part No.XMLA500D2S11
MYR940.51
Each
units
Differential 30bar 500bar 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. 235-5835
Mfr. Part No.24PCCFA6D
BrandHoneywell
MYR147.04
Each
units
Differential 0psi 15psi 0.2 % Unamplified Nitrogen Gas, Oxygen, Water - 165 → 285 mV Solder Tag - 1 ms - 10 V dc -
RS Stock No. 228-8533
Mfr. Part No.26PCAFA6G
BrandHoneywell
MYR199.14
Each
units
Gauge 0psi 1psi ±0.25 % Unamplified Nitrogen Gas, Oxygen - 14.7 → 18.7 mV 4-Pin Connector - 1 ms - 10 V dc -