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. 181-1384
Mfr. Part No.142PC15A
BrandHoneywell
HK$3,539.09
Each
units
Absolute 0psi 15psi ±0.4 % Amplified Gas - 1 6 V PCB - 1 ms 20 mA 7 16 V dc -
RS Stock No. 922-7318
Mfr. Part No.MPX2200AP
BrandNXP
HK$108.50
Each (In a Tray of 20)
units
Absolute 0bar 200kPa ±1 % - Air - 38.5 → 41.5 mV PCB Mount - 1 ms - 10 V dc -
RS Stock No. 828-5701
BrandRS PRO
HK$1,761.47
Each
units
Relative 0bar 50mbar <±0.25 % Voltage Oil, Water BSP 1/4 0.5 → 4.5 V DIN 43650 Connector - - 6 mA 9 → 32 V dc -
RS Stock No. 313-5351
Mfr. Part No.14X1HA1GV1
BrandVega
HK$2,202.30
Each
units
Relative 0bar 25bar 0.3 % - Fluid, Gas, Vapour G1/2 4 → 20 mA DIN 43650 Connector - - - 12 → 36 V dc -
RS Stock No. 797-5043
BrandRS PRO
HK$1,682.76
Each
units
Relative 0bar 1bar ±0.25 % Voltage Air, Gas, Hydraulic Fluid, Liquid, Water BSP 1/4 0 → 5 V DIN 43650 Connector - - - 9 → 32 V dc -
RS Stock No. 313-5373
Mfr. Part No.14X1IA1GV1
BrandVega
HK$2,202.30
Each
units
Relative 0bar 40bar 0.3 % - Fluid, Gas, Vapour G1/2 4 → 20 mA DIN 43650 Connector - - - 12 → 36 V dc -
RS Stock No. 239-0771
Mfr. Part No.4246-52
BrandNorgren
HK$910.05
Each
units
- - 17bar 12 % Relay Air G1/4 - DIN Connector - - 5 A 240 V ac/dc -
RS Stock No. 455-4652
Mfr. Part No.3100B0040G01B000
HK$1,103.96
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 -
RS Stock No. 177-5940
Mfr. Part No.40PC100G2A
BrandHoneywell
HK$579.65
Each (In a Tray of 10)
units
Relative 0psi 100psi ±0.2 % Amplified Gas - 0.5 → 4.5 V PCB - 1 ms 10 mA 4.75 → 5.25 V dc -
RS Stock No. 667-0914
Mfr. Part No.40PC100G2A
BrandHoneywell
HK$698.51
Each
units
Relative 0psi 100psi 0.8 % Amplified Gas - 0.5 mA PCB - 1 ms - 5 V dc -
RS Stock No. 613-7732
Mfr. Part No.404366/000-451-405-504-20-61/000
BrandJumo
HK$1,981.29
Each
units
Relative 0bar 0.25bar - - Fluid, Gas G1/2 4 20 mA DIN 43650 Connector - - - 10 30 V dc -
RS Stock No. 374-8777
Mfr. Part No.787264
BrandBurkert
HK$348.43
Each
units
Differential 50bar 200bar - Relay Air, Hydraulic Fluid, Oil Emulsion, Water G1/4 - Spade Terminal - - - - -
RS Stock No. 398-7051
Mfr. Part No.0166411031043
BrandSuco
HK$273.99
Each
units
- 10bar 20bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine G1/4 - Spade Terminal - - - 42 V -
RS Stock No. 797-4964
BrandRS PRO
HK$1,598.63
Each
units
Relative 0bar 16bar ±0.25 % Voltage Air, Gas, Hydraulic Fluid, Liquid, Water BSP 1/4 0 → 100 mV DIN 43650 Connector - - - 3 → 12 V dc -
RS Stock No. 774-4104
Mfr. Part No.SDP610-500Pa
BrandSensirion
HK$323.81
Each
units
Differential -500Pa 500Pa 3 % I2C Air, Non-Aggressive Gas - - 4 Pin SMD Connector - 4.6 ms 6 mA 2.7 → 3.3 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 -
RS Stock No. 448-8101
Mfr. Part No.0184458031-SS
BrandSuco
HK$863.22
Each
units
- 1bar 10bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine G1/4 - DIN 46350 Connector - - 4 A 250 V -
RS Stock No. 455-4551
Mfr. Part No.22ISBGB1000ABUA001
HK$2,482.48
Each
units
Relative 0bar 10bar 0.25 % Analogue Fluid, Gas BSP 1/4 4 → 20 mA DIN 43650 Type A - - - 7 → 35 V dc -
RS Stock No. 374-8890
Mfr. Part No.787269
BrandBurkert
HK$1,252.20
Each
units
Differential 1bar 10bar - Relay Air, Hydraulic Fluid, Oil Emulsion, Water G1/4 - Spade Terminal - - - - -
RS Stock No. 739-6777
Mfr. Part No.PBT-RB010SG1SSNAMA0Z
BrandSick
HK$1,203.68
Each
units
Relative 0bar 10bar ±0.5 % Analogue Fluid, Gas G1/4 4 → 20 mA M12 Connector - 4 ms 25 mA 8 → 30 V dc -
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