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. 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. 199-412
Mfr. Part No.XMLA010B2S11
HK$1,930.36
Each
units
Differential 0.6bar 10bar 2 % Relay Air, Fresh Water, Hydraulic Fluid, Sea Water G1/4 - PG13.5 Cable Gland - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc - Zinc Alloy
RS Stock No. 169-7637
Mfr. Part No.164PC01D37
BrandHoneywell
HK$6,345.746
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. 774-4085
Mfr. Part No.SDP1000-L
BrandSensirion
HK$710.89
Each
units
Differential -20Pa 500Pa 0.2 %, 1.5 % Analogue Air, Non-Aggressive Gas - 0.25 → 4 V 3 Pin SMD Connector 40 ms 5.2 mA 4.75 → 5.25 V - PPS
RS Stock No. 448-8000
Mfr. Part No.5000BGN2000M3003A001
HK$4,976.46
Each
units
Gauge 0mbar 200mbar 0.2 % - - G1/4 4 → 20 mA Wire Lead 5 ms - 9 → 35 V dc - Stainless Steel
RS Stock No. 124-1473
Mfr. Part No.46879278
BrandWIKA
HK$1,134.58
Each
units
- 0bar 160bar 0.5 % Analogue Gas, Liquid G1/4 4 → 20 mA DIN 175301-803 C < 4 ms - 8 → 30 V dc - Stainless Steel
RS Stock No. 124-1474
Mfr. Part No.46879245
BrandWIKA
HK$1,088.71
Each
units
- 0bar 400bar 0.5 % Analogue Gas, Liquid G1/4 4 → 20 mA M12 x 1 < 4 ms - 8 → 30 V dc - Stainless Steel
RS Stock No. 448-8016
Mfr. Part No.5000BGN2000M3004A001
HK$5,048.91
Each
units
Gauge 71mbar 200mbar 0.2 % Analogue Water/Diesel/Fuel Oil G1/4 4 → 20 mA Wire Lead 5 ms 20 mA 9 → 35 V dc - Stainless Steel
RS Stock No. 448-8117
Mfr. Part No.0184459031-SS
BrandSuco
HK$1,007.54
Each
units
- 10bar 50bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine G1/4 - DIN 46350 Connector - 4 A 250 V - Stainless Steel
RS Stock No. 448-8022
Mfr. Part No.5000BGN3500M3005A001
HK$5,122.51
Each
units
Gauge 201mbar 350mbar 0.2 % - - G1/4 4 → 20 mA Wire Lead 5 ms - 9 → 35 V dc - Stainless Steel
RS Stock No. 111-5924
Mfr. Part No.PX3AG1BH046BSAAX
BrandHoneywell
HK$550.09
Each
units
Sealed Gauge 0bar 46bar ±0.25 % Analogue Air, Brake Fluid, Hydraulic Fluid, Oil, Refrigeration Fluid G1/4 0.5 → 4.5 V Metri-Pack 150 <2 ms 3 mA 4.75 → 5.25 V dc - Brass
RS Stock No. 124-1475
Mfr. Part No.46879424
BrandWIKA
HK$1,165.96
Each
units
- 0bar 10bar 0.5 % Analogue Gas, Liquid G1/4 4 → 20 mA DIN 175301-803 A < 4 ms - 8 → 30 V dc - Stainless Steel
RS Stock No. 124-1483
Mfr. Part No.46879287
BrandWIKA
HK$1,134.58
Each
units
- -1bar 9bar 0.5 % Analogue Gas, Liquid G1/4 0 → 5 V DIN 175301-803 C < 4 ms - 8 → 30 V dc - Stainless Steel
RS Stock No. 177-4880
Mfr. Part No.2SMPP-02
BrandOmron
HK$26.87
Each (In a Tube of 112)
units
- - - - - - - - - - - - - -
RS Stock No. 828-5767
BrandRS PRO
HK$1,580.48
Each
units
Gauge 0bar 10bar <±0.25 % Current Sewage, Viscous Fluid, Water G3/4 4 → 20 mA M12 Connector - 28 mA 9 → 32 V dc - Stainless Steel
RS Stock No. 123-5251
BrandRS PRO
HK$6,366.32
Each
units
Absolute 0mbar 1000mbar ±0.25 % Analogue Air, Hydraulic Fluid, Liquid, Non-Aggressive Gas, Oil, Water G1/4 0 → 5 V, 4 → 20 mA Battery - - - - Stainless Steel
RS Stock No. 463-5723
Mfr. Part No.401001/000-460-405-523-20-601-61/000
BrandJumo
HK$1,528.14
Each
units
- 0bar 16bar 0.5 % - Hydraulic Fluid, Pneumatic Fluid G1/2 4 → 20 mA DIN 43650 Connector - - 15 → 30 V dc - Stainless Steel
RS Stock No. 124-1484
Mfr. Part No.46879288
BrandWIKA
HK$1,134.58
Each
units
- 0bar 1bar 0.5 % Analogue Gas, Liquid G1/4 4 → 20 mA DIN 175301-803 C < 4 ms - 8 → 30 V dc - Stainless Steel
RS Stock No. 797-4967
BrandRS PRO
HK$1,227.06
Each
units
Gauge 0bar 250bar ±0.25 % Current Air, Gas, Hydraulic Fluid, Liquid, Water BSP 1/4 4 → 20 mA DIN 43650 Connector - 20 mA 9 → 32 V dc - Stainless Steel
RS Stock No. 896-8430
Mfr. Part No.3500B0001G01E000
HK$1,088.71
Each
units
Gauge - 1bar 0.25 % Current Air, Gas, Water G1/4 4 → 20 mA M12 Connector - - 10 → 30 V dc - Stainless Steel