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 Response Time Maximum Current Supply Voltage Interface Housing Material
RS Stock No. 177-4880
Mfr. Part No.2SMPP-02
BrandOmron
HK$26.87
Each (In a Tube of 112)
units
- - - - - - - - - - - - - -
RS Stock No. 788-4925
Mfr. Part No.2SMPP-03
BrandOmron
HK$48.505
Each (In a Pack of 2)
units
Gauge -50kPa 50kPa - Amplified Air - - PCB - 200 μA - - PPS
RS Stock No. 177-4881
Mfr. Part No.2SMPP-03
BrandOmron
HK$35.519
Each (In a Tube of 112)
units
- - - - - - - - - - - - - -
RS Stock No. 818-4623
Mfr. Part No.D6F-PH0505AD3
BrandOmron
HK$266.97
Each
units
Differential -50Pa 50Pa ±3 % I2C Air - - PCB 33 ms 6 mA 2.3 → 3.6 V dc - PPS
RS Stock No. 176-0830
Mfr. Part No.2SMPB-02B
BrandOmron
HK$22.99
Each (In a Pack of 3)
units
Absolute 30kPa 110kPa ±3.9 Pa, 100 Pa I2C Air - - - 10 ms 800 μA 3.6 V I2C, SPI -
RS Stock No. 788-4921
Mfr. Part No.2SMPP-02
BrandOmron
HK$29.95
Each (In a Pack of 2)
units
Gauge 0kPa 37kPa - Amplified Air - - PCB - 130 μA - - PPS
RS Stock No. 176-0823
Mfr. Part No.2SMPB-02B
BrandOmron
HK$18.07
Each (On a Reel of 100)
units
Absolute 30kPa 110kPa ±3.9 Pa, 100 Pa I2C Air - - - 10 ms 800 μA 3.6 V I2C, SPI -
RS Stock No. 176-0828
Mfr. Part No.2SMPB-02E
BrandOmron
HK$25.033
Each (In a Pack of 3)
units
Absolute 30kPa 110kPa ±3.9 Pa, ±80 Pa I2C Air - - - 10 ms 800 μA 3.6 V I2C, SPI -
RS Stock No. 176-0822
Mfr. Part No.2SMPB-02E
BrandOmron
HK$20.21
Each (On a Reel of 100)
units
Absolute 30kPa 110kPa ±3.9 Pa, ±80 Pa I2C Air - - - 10 ms 800 μA 3.6 V I2C, SPI -