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. 719-1030
Mfr. Part No.MPX2010GP
BrandNXP
HK$116.49
Each
units
- - - - - - - - - - - - - -
RS Stock No. 448-8101
Mfr. Part No.0184458031-SS
BrandSuco
HK$813.67
Each
units
- 1bar 10bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine G1/4 - DIN 46350 Connector - 4 A 250 V - Stainless Steel
RS Stock No. 399-1634
Mfr. Part No.XMAV25L2135
HK$891.12
Each
units
Differential 3.5bar 25bar 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 - PC
RS Stock No. 455-4781
Mfr. Part No.3100B0250S01E000
HK$979.84
Each
units
Gauge 0bar 250bar 0.25 % Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil G1/4 4 → 20 mA M12 Connector 1 ms - 8 → 30 V dc - -
RS Stock No. 922-7318
Mfr. Part No.MPX2200AP
BrandNXP
HK$90.717
Each (In a Tray of 20)
units
Absolute 0kPa 200kPa ±1 % - Air - 38.5 → 41.5 mV PCB Mount 1 ms - 10 V dc - Epoxy
RS Stock No. 853-6462
Mfr. Part No.PX2AG2XX002BAAAX
BrandHoneywell
HK$617.44
Each
units
Absolute 0bar 2bar ±0.25 % Analogue Air, Brake Fluid, Hydraulic Fluid, Oil, Refrigeration Fluid G1/8 0.5 → 4.5 V Metri-Pack 150 <2 ms 5 mA 4.75 → 5.25 V dc - Stainless Steel
RS Stock No. 239-0771
Mfr. Part No.4246-52
BrandNorgren
HK$882.85
Each
units
- - 17bar 12 % Relay Air G1/4 - DIN Connector - 5 A 240 V ac/dc - Aluminium
RS Stock No. 395-241
Mfr. Part No.164PC01D37
BrandHoneywell
HK$7,618.69
Each
units
Differential 0in wg 10in wg ±2 % Amplified Gas - 5.9 → 6.1 V Solder Tag 1 ms - 8 V dc - Plastic
RS Stock No. 725-5945
Mfr. Part No.12719316
BrandWIKA
HK$992.63
Each
units
Gauge 0bar 40bar 0.5 % Current Hydraulic Fluid - 4 → 20 mA - - - 8 → 30 V dc - Stainless Steel
RS Stock No. 455-4567
Mfr. Part No.22ISBGB2500ABUA001
HK$2,543.15
Each
units
Gauge 0bar 25bar 0.25 % Analogue Fluid, Gas BSP 1/4 4 → 20 mA DIN 43650 Type A - - 7 → 35 V dc - -
RS Stock No. 804-3884
Mfr. Part No.7MF4033-1BA00-2RB1
BrandSiemens
HK$12,919.65
Each
units
Gauge 0.01bar 1bar - Current Oil G1/2 4 → 20 mA M20 Cable Entry - 20 mA 9 → 24 V - Aluminium, Stainless Steel
RS Stock No. 455-4551
Mfr. Part No.22ISBGB1000ABUA001
HK$2,165.54
Each
units
Gauge 0bar 10bar 0.25 % Analogue Fluid, Gas BSP 1/4 4 → 20 mA DIN 43650 Type A - - 7 → 35 V dc - -
RS Stock No. 828-5701
BrandRS PRO
HK$1,369.45
Each
units
Gauge 0mbar 50mbar <±0.25 % Voltage Oil, Water BSP 1/4 0.5 → 4.5 V DIN 43650 Connector - 6 mA 9 → 32 V dc - Stainless Steel
RS Stock No. 828-5723
BrandRS PRO
HK$1,399.70
Each
units
Gauge 0mbar 500mbar <±0.25 % Voltage Oil, Water BSP 1/4 0.5 → 4.5 V DIN 43650 Connector - 6 mA 9 → 32 V dc - Stainless Steel
RS Stock No. 797-5043
BrandRS PRO
HK$1,227.06
Each
units
Gauge 0bar 1bar ±0.25 % Voltage Air, Gas, Hydraulic Fluid, Liquid, Water BSP 1/4 0 → 5 V DIN 43650 Connector - - 9 → 32 V dc - Stainless Steel
RS Stock No. 795-4737
Mfr. Part No.3100B0010G05G000
HK$1,049.36
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 - Stainless Steel
RS Stock No. 178-487
Mfr. Part No.TKDA-N-1-Z-B01C-M-V
BrandGefran
HK$2,273.30
Each
units
Absolute 0bar 100bar ±0.5 % Digital Hydraulic Fluid, Pneumatic Fluid G1/4 10 V dc M12 Connector 1 ms - 15 → 30 V dc - -
RS Stock No. 896-8496
Mfr. Part No.3500B0001A01G000
HK$1,291.16
Each
units
Absolute - 1bar 0.25 % Current Air, Gas, Water G1/4 4 → 20 mA DIN 43650 Type A - - 10 → 30 V dc - Stainless Steel
RS Stock No. 169-7637
Mfr. Part No.164PC01D37
BrandHoneywell
HK$6,823.382
Each (In a Box of 30)
units
Differential 0in wg 10in wg ±2 % Amplified Gas - 5.9 → 6.1 V Solder Tag 1 ms - 8 V dc - Plastic
RS Stock No. 455-4652
Mfr. Part No.3100B0040G01B000
HK$869.52
Each
units
Gauge 0bar 40bar 0.25 % Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil G1/4 4 → 20 mA DIN 43650 Type A 1 ms - 8 → 30 V dc - -
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