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. 835-3894
Mfr. Part No.PT5404
TWD4,414.00
Each
units
Relative 0bar 10bar ±0.5 % Analogue Gas, Liquid G1/4 4 → 20 mA M12 Connector - 1 ms - 8.5 → 36 V dc -
RS Stock No. 111-5919
Mfr. Part No.PX3AN2BS250PAAAX
BrandHoneywell
TWD1,820.00
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 -
RS Stock No. 748-4723
Mfr. Part No.ZSE40AF-01-R
BrandSMC
TWD5,805.00
Each
units
Vacuum -100kPa 100kPa ±0.2 % Analogue Gas BSP 1/8 1 → 5 V, 4 → 20 mA Wire Lead - 2.5 ms 45 mA 12 → 24 V dc -
RS Stock No. 609-6912
Mfr. Part No.XMLA002A2S11
TWD7,150.00
Each
units
Differential 0.15bar 2.5bar 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. 124-2127
Mfr. Part No.9013FSG2J21M4
BrandSquare D
TWD1,551.00
Each
units
Differential 15 (Approximate) psi, 20 (Rising) psi 30 (Approximate) psi, 65 (Rising) psi ±3 (Repeat) % 2NC Fresh Water 0.25 in NPSF - Screw Clamp - - - - -
RS Stock No. 896-8412
Mfr. Part No.3500B700MG01B000
TWD4,293.00
Each
units
Relative - 0.7bar 0.25 % Current Air, Gas, Water G1/4 4 → 20 mA DIN 43650 Type C - - - 10 → 30 V dc -
RS Stock No. 455-4719
Mfr. Part No.3100B1000S2TB000
TWD4,280.00
Each
units
Gauge 0bar 1000bar 0.25 % Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil M12 4 → 20 mA DIN 43650 Type C - 1 ms - 8 → 30 V dc -
RS Stock No. 177-5943
Mfr. Part No.SCX01DN
BrandHoneywell
TWD5,599.20
Each (In a Box of 25)
units
Differential 0psi 1psi ±1 % Wheatstone Bridge Pneumatic Fluid - 0 → 18 mV Solder Tag - 100 μs - 20 V dc -
RS Stock No. 455-5065
Mfr. Part No.SCX01DN
BrandHoneywell
TWD6,806.00
Each
units
Differential 0psi 1psi ±0.1 % Unamplified Pneumatic Fluid - 17.82 → 18.18 mV Solder Tag - 100 ms - 20 V dc -
RS Stock No. 286-664
Mfr. Part No.26PCCFA6G
BrandHoneywell
TWD1,263.00
Each
units
Gauge 0psi 15psi ±0.25 % Unamplified Nitrogen Gas, Oxygen - 97 → 103 mV PCB - 1 ms - 10 V dc -
RS Stock No. 455-4731
Mfr. Part No.3100B1600S2TB000
TWD4,339.00
Each
units
Gauge 0bar 1600bar 0.25 % Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil M12 4 → 20 mA DIN 43650 Type A - 1 ms - 8 → 30 V dc -
RS Stock No. 835-3911
Mfr. Part No.PU5401
TWD4,414.00
Each
units
Relative 0bar 250bar ±0.5 % Analogue Gas, Liquid G1/4 0 → 10 V M12 Connector - 1 ms - 16 → 36 V dc -
RS Stock No. 818-4623
Mfr. Part No.D6F-PH0505AD3
BrandOmron
TWD884.00
Each
units
Differential -50Pa 50Pa ±3 % I2C Air - - PCB - 33 ms 6 mA 2.3 → 3.6 V dc -
RS Stock No. 324-0992
Mfr. Part No.XMLB002A2S11
TWD6,240.00
Each
units
Differential 0.3bar 2.5bar 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. 169-7679
Mfr. Part No.26PCCFA2G
BrandHoneywell
TWD28,537.00
1 Box of 25
Box(es)
Relative 0psi 15psi ±0.25 % Wheatstone Bridge Nitrogen Gas, Oxygen - 0 → 100 mV PCB - 1 ms - 2.5 → 16 V dc -
RS Stock No. 655-8173
Mfr. Part No.26PCCF A2G
BrandHoneywell
TWD1,568.00
Each
units
Relative 0psi 15psi ±0.5 % Wheatstone Bridge Nitrogen Gas, Oxygen, Water - 100 mV dc PCB - 1 ms - 10 V dc -
RS Stock No. 324-1002
Mfr. Part No.XMLB004A2S11
TWD8,391.00
Each
units
Differential 0.25bar 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 -
RS Stock No. 169-0724
Mfr. Part No.MPXV2202DPT1
BrandNXP
TWD282.10
Each (On a Reel of 100)
units
Differential 0bar 200kPa ±1 % Voltage Air - 38.5 → 41.5 mV PCB Mount - 1 ms 6 mA 16 V dc -
RS Stock No. 795-4711
Mfr. Part No.3100R0010G01B000
TWD4,280.00
Each
units
Relative 0bar 10bar ±0.25 % Voltage Fluid, Gas G1/4 0 → 5 V DIN 43650 Type A - 1 ms 4.5 mA 7 → 30 V dc -
RS Stock No. 788-4925
Mfr. Part No.2SMPP-03
BrandOmron
TWD213.50
Each (In a Pack of 2)
units
Relative -50kPa 50kPa - Amplified Air - - PCB - - 200 μA - -