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. 199-399
Mfr. Part No.XMPA12C2131
HK$363.30
Each
units
Differential 1.3bar 12bar 3.5 % - Air, Fresh Water, Sea Water G1/4 - PG13.5 Cable Gland - 1.5 A - - Fibreglass
RS Stock No. 399-1628
Mfr. Part No.XMAV12L2135
HK$630.92
Each
units
Differential 1.3bar 12bar 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. 821-4112
Mfr. Part No.060-0238-10
BrandHoneywell
HK$4,457.90
Each
units
Gauge 0psi - ±0.6 % Voltage Force - 2 mV/V Wire Lead - - 10 V dc - Stainless Steel
RS Stock No. 324-1018
Mfr. Part No.XMLB010A2S11
HK$1,608.25
Each
units
Differential 0.7bar 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. 896-8471
Mfr. Part No.3500B02B5A01B000
HK$1,441.25
Each
units
Absolute - 2.5bar 0.25 % Current Air, Gas, Water G1/4 4 → 20 mA DIN 43650 Type C - - 10 → 30 V dc - Stainless Steel
RS Stock No. 609-6928
Mfr. Part No.XMLA010A2C11
HK$1,226.48
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. 736-1488
Mfr. Part No.PBS-RB100SG1SSNBMA0Z
BrandSick
HK$2,774.54
Each
units
Gauge 0bar 100bar ±1 % Analogue + PNP NO/NC Programmable Fluid, Gas G1/4 4 → 20 mA M12 Connector 3 ms 250 mA 15 → 35 V dc - ABS, PC, Stainless Steel, TPE
RS Stock No. 535-1202
Mfr. Part No.5266050LBACTI
HK$1,592.86
Each
units
Differential -50Pa 50Pa ±1 % Analogue Air, Non-Conductive Gas - 0 → 10 V Terminal Strip 1 s - 24 V ac/dc - Stainless Steel
RS Stock No. 181-2090
Mfr. Part No.142PC01D
BrandHoneywell
HK$5,767.87
Each
units
Differential 0psi 1psi ±0.75 % Amplified Gas - 1 → 6 V PCB 1 ms 20 mA 7 → 16 V dc - -
RS Stock No. 302-5822
Mfr. Part No.XMLA004A2S11
HK$1,394.00
Each
units
Differential 0.4bar 4bar 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. 313-7026
Mfr. Part No.6742-0039
BrandHerga
HK$316.34
Each
units
- 16psi 30psi - Relay - - - Spade Terminal - - 250 V ac - Nylon
RS Stock No. 361-3441
Mfr. Part No.XMLA010A2S12
HK$1,270.00
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 - Zinc Alloy
RS Stock No. 398-7067
Mfr. Part No.0166415031059
BrandSuco
HK$225.50
Each
units
- 20bar 50bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine G1/4 - Spade Terminal - - 42 V - Zinc Plated Steel
RS Stock No. 827-6674
Mfr. Part No.PSE541-R06
BrandSMC
HK$528.22
Each
units
Negative Pressure 0kPa -101kPa ±2 % Analogue Air, Gas - 0.6 → 1 V, 1 → 5 V ZS-28-C Connector - 15 mA 12 → 24 V dc - PBT
RS Stock No. 821-4121
Mfr. Part No.060-0241-04
BrandHoneywell
HK$6,801.25
Each
units
Gauge - - ±0.6 % Voltage Force - 2 mV/V Wire Lead - - 10 V dc - Stainless Steel
RS Stock No. 361-3435
Mfr. Part No.XMLA004A2S12
HK$1,122.04
Each
units
Differential 0.4bar 4bar 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 - Zinc Alloy
RS Stock No. 259-6648
Mfr. Part No.6731-0026
BrandHerga
HK$259.70
Each
units
- 0.08psi 0.9psi 10 % Relay - - - Spade Terminal - - 250 V ac - Nylon
RS Stock No. 324-0958
Mfr. Part No.XMLA070D2S11
HK$1,248.90
Each
units
Differential 50bar 70bar 2 % Relay Hydraulic Fluid G1/4 - PG13.5 Cable Gland - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc - Zinc Alloy
RS Stock No. 797-5011
BrandRS PRO
HK$1,175.93
Each
units
Gauge 0bar 6bar ±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. 821-4119
Mfr. Part No.060-0239-08
BrandHoneywell
HK$4,833.00
Each
units
Gauge 0psi - ±0.6 % Voltage Force - 2 mV/V Wire Lead - - 10 V dc - Stainless Steel
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