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. 922-7302
Mfr. Part No.MPX2010GP
BrandNXP
$17.691
Each (In a Tray of 20)
units
Gauge 0kPa 10kPa ±1 % - Air - 24 → 26 mV PCB Mount 1 ms - 10 V dc - Epoxy
RS Stock No. 463-5565
Mfr. Part No.401001/000-457-405-523-20-601-61/000
BrandJumo
$298.38
Each
units
- 0bar 4bar 0.5 % - Hydraulic Fluid, Pneumatic Fluid G1/2 4 → 20 mA DIN 43650 Connector - - 15 → 30 V dc - Stainless Steel
RS Stock No. 173-2218
Mfr. Part No.SDP616
BrandSensirion
$75.72
Each (In a Tray of 80)
units
Differential -500Pa 500Pa 3 % I2C Air, Nitrogen Gas, Oxygen Gas 5.2 mm Tube - - 90 ms <5 mA 3.3 V - PBT
RS Stock No. 827-6668
Mfr. Part No.PSE531-M5-L
BrandSMC
$126.79
Each
units
Vacuum 0kPa -101kPa ±2 (With Rated Pressure Range) %, ±5 (With Extension Analog Output Range) % Analogue Air, Gas - 0.6 → 1 V, 1 → 5 V Wire Lead - 15 mA 12 → 24 V dc - Stainless Steel
RS Stock No. 535-1230
Mfr. Part No.5266500LBACTI
$245.03
Each
units
Differential -500Pa 500Pa ±1 % Analogue Air, Non-Conductive Gas - 0 → 10 V Terminal Strip 1 s - 24 V ac/dc - Stainless Steel
RS Stock No. 302-5822
Mfr. Part No.XMLA004A2S11
$368.87
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. 836-8966
Mfr. Part No.ADP42510
BrandPanasonic
$17.14
Each
units
Gauge - - ±0.3 % Voltage Air, Fluid - 100±40 mV PCB - 1.5 mA - - -
RS Stock No. 774-4097
Mfr. Part No.SDP1000-L05
BrandSensirion
$146.54
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. 398-6985
Mfr. Part No.0184457031003
BrandSuco
$147.54
Each
units
- 0.3bar 1.5bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine G1/4 - DIN 46350 Connector - 4 A 250 V - Zinc Plated Steel
RS Stock No. 922-7324
Mfr. Part No.MPX5010DP
BrandNXP
$18.772
Each (In a Tray of 20)
units
Differential 0kPa 10kPa ±5 % Analogue Air, Fluid - 4.7 V PCB Mount 1 ms - 4.75 → 5.25 V dc - Epoxy
RS Stock No. 173-2219
Mfr. Part No.SDP1000-L05
BrandSensirion
$193.124
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. 719-1030
Mfr. Part No.MPX2010GP
BrandNXP
$19.60
Each
units
- - - - - - - - - - - - - -
RS Stock No. 111-5918
Mfr. Part No.PX3AF1BH010BSAAX
BrandHoneywell
$62.66
Each
units
Sealed Gauge 0bar 10bar ±0.25 % Analogue Lubricants, Oil, Refrigeration Fluid - 0 → 4.5 V Metri-Pack 150 <2 ms 3.5 mA 5 V dc - Brass
RS Stock No. 448-8101
Mfr. Part No.0184458031-SS
BrandSuco
$232.48
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. 739-6783
Mfr. Part No.PBT-RB250SG1SSNAMA0Z
BrandSick
$185.13
Each
units
Gauge 0bar 250bar ±0.5 % Analogue Fluid, Gas G1/4 4 → 20 mA M12 Connector 4 ms 25 mA 8 → 30 V dc - Stainless Steel
RS Stock No. 828-5760
BrandRS PRO
$235.37
Each
units
Gauge 0bar 2bar <±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. 111-5924
Mfr. Part No.PX3AG1BH046BSAAX
BrandHoneywell
$86.03
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. 374-8755
Mfr. Part No.787261
BrandBurkert
$69.59
Each
units
Differential 1bar 10bar - Relay Air, Hydraulic Fluid, Oil Emulsion, Water G1/4 - Spade Terminal - - - - -
RS Stock No. 836-9026
Mfr. Part No.ADP5160
BrandPanasonic
$35.23
Each
units
Gauge - - ±1.25 % Amplified Air - 4.5 V PCB - 10 mA 5 V dc - -
RS Stock No. 169-8090
Mfr. Part No.ADP5160
BrandPanasonic
$30.941
Each (In a Tube of 100)
units
Gauge - - ±1.25 % Amplified Air - 4.5 V PCB - 10 mA 5 V dc - -
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