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. 535-1224
Mfr. Part No.5266250LBACTI
SGD282.04
Each
units
Differential -250Pa 250Pa ±1 % Analogue Air, Non-Conductive Gas - 0 → 10 V Terminal Strip 1 s - 24 V ac/dc - Stainless Steel
RS Stock No. 922-7399
Mfr. Part No.MPXV5004DP
BrandNXP
SGD17.178
Each (In a Tray of 25)
units
Differential 0kPa 3.92kPa ±1.5 % Analogue Air, Fluid - 1 → 4.9 V PCB Mount - - 4.75 → 5.25 V dc - Epoxy
RS Stock No. 896-8440
Mfr. Part No.3500B350MG01G000
SGD208.94
Each
units
Gauge - 350mbar 0.25 % Current Air, Gas, Water G1/4 4 → 20 mA DIN 43650 Type A - - 10 → 30 V dc - Stainless Steel
RS Stock No. 397-1135
Mfr. Part No.6101-0005
BrandHerga
SGD41.81
Each
units
Differential 25mbar 125mbar - Relay Fluid - - - - 20 mA 250 V ac - Fibreglass
RS Stock No. 455-4624
Mfr. Part No.3100B0010G01B000
SGD229.41
Each
units
Gauge 0bar 10bar 0.25 % Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil G1/4 4 → 20 mA DIN 43650 Type C 1 ms - 10 → 30 V dc - -
RS Stock No. 111-5919
Mfr. Part No.PX3AN2BS250PAAAX
BrandHoneywell
SGD86.55
Each
units
Absolute 0psi 250psi ±0.25 % Analogue Air, Brake Fluid, Hydraulic Fluid, Oil, Refrigeration Fluid NPT 1/8 0.5 → 4.5 V Metri-Pack 150 <2 ms 3 mA 4.75 → 5.25 V dc - Brass
RS Stock No. 797-5015
BrandRS PRO
SGD210.02
Each
units
Gauge 0bar 25bar ±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. 914-8356
Mfr. Part No.DP101AN
BrandPanasonic
SGD173.78
Each
units
Gauge -0.1MPa 0.1MPa - Analogue + NPN-NO/NC Programmable Non-Corrosive Gas NPT 1/8 1 → 5 V dc, 4 → 20 mA Wire Lead 5000 ms 100 mA 12 → 24 V dc - PBT
RS Stock No. 535-1252
Mfr. Part No.526610CLBACTI
SGD219.67
Each
units
Differential -1000Pa 1000Pa ±1 % Analogue Air, Non-Conductive Gas - 0 → 10 V Terminal Strip 1 s - 24 V ac/dc - Stainless Steel
RS Stock No. 302-5838
Mfr. Part No.XMLA010A2S11
SGD259.74
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. 173-2219
Mfr. Part No.SDP1000-L05
BrandSensirion
SGD111.511
Each (In a Tray of 25)
units
Differential -5Pa 125Pa 0.3 %, 2 % 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. 609-7094
Mfr. Part No.XMPE12C2242
SGD97.33
Each
units
Differential 1.3bar 12bar 3.5 % - Air, Fresh Water, Sea Water G3/8 - PG13.5 Cable Gland - 1.5 A - - Fibreglass
RS Stock No. 774-4097
Mfr. Part No.SDP1000-L05
BrandSensirion
SGD141.01
Each
units
Differential -5Pa 125Pa 0.3 %, 2 % 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. 914-8322
Mfr. Part No.DP-101A-M-P
BrandPanasonic
SGD170.83
Each
units
Gauge -100kPa 100kPa - PNP Non-Corrosive Gas G1/8 1 → 5 V dc, 4 → 20 mA Wire Lead 5000 ms 100 mA 12 → 24 V dc - PBT
RS Stock No. 746-3449
Mfr. Part No.X5072-TB-A1-CA-H1-PA 250, mbar G
BrandDruck
SGD524.80
Each
units
Gauge - 250mbar ±0.2 % Analogue Fluid G1/4 4 → 20 mA DIN 43650 Type A 10 ms 20 mA 7 → 28 V - Stainless Steel
RS Stock No. 313-5345
Mfr. Part No.14X1FA1GV1
BrandVega
SGD378.14
Each
units
Gauge 0bar 10bar 0.3 % - Fluid, Gas, Vapour G1/2 4 → 20 mA DIN 43650 Connector - - 12 → 36 V dc - Nickel Plated Brass
RS Stock No. 302-5844
Mfr. Part No.XMLA020A2S11
SGD256.91
Each
units
Differential 1bar 20bar 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. 235-5778
Mfr. Part No.24PCEFA6D
BrandHoneywell
SGD36.77
Each
units
Differential 0psi 0.5psi 0.2 % Unamplified Nitrogen Gas, Oxygen, Water - 25 → 45 mV Solder Tag 1 ms - 10 V dc - -
RS Stock No. 535-1167
Mfr. Part No.5266250LBHTI
SGD231.24
Each
units
Differential -250Pa 250Pa ±1 % Analogue Air, Non-Conductive Gas - 4 → 20 mA Terminal Strip 1 s - 24 V dc - Stainless Steel
RS Stock No. 609-7022
Mfr. Part No.XMLB070D2S11
SGD341.50
Each
units
Differential 7bar 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
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