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. 111-5919
Mfr. Part No.PX3AN2BS250PAAAX
BrandHoneywell
MYR299.00
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 - Brass
RS Stock No. 609-6928
Mfr. Part No.XMLA010A2C11
MYR879.02
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. 398-7045
Mfr. Part No.0166407031027
BrandSuco
MYR162.87
Each
units
- 1bar 10bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine G1/4 - Spade Terminal - - 42 V - Zinc Plated Steel
RS Stock No. 822-6418
Mfr. Part No.E8F2-B10C
BrandOmron
MYR1,526.06
Each
units
Gauge 0MPa 1MPa ±1 % Open Collector Gas BSP 1/8 1 → 5 V Wire Lead 5 ms 70 mA 12 → 24 V dc - ABS
RS Stock No. 455-4624
Mfr. Part No.3100B0010G01B000
MYR720.45
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. 235-5778
Mfr. Part No.24PCEFA6D
BrandHoneywell
MYR136.33
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. 746-3499
Mfr. Part No.X5072-TB-A1-CA-H1-PA 250 bar SG
BrandDruck
MYR1,649.88
Each
units
Sealed Gauge - 250bar ±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. 125-3726
Mfr. Part No.7MF1565-3BG00-1AA1
BrandSiemens
MYR780.09
Each
units
Gauge 0bar 6bar 0.25 % Analogue Aggressive Media, Gas, Liquid, Non-Aggressive Media, Vapour - 4 → 20 mA DIN EN 175301 Connector, M16 <5 ms 20 mA 7 → 33 V dc - Stainless Steel
RS Stock No. 448-8016
Mfr. Part No.5000BGN2000M3004A001
MYR2,543.28
Each
units
Gauge 71mbar 200mbar 0.2 % Analogue Water/Diesel/Fuel Oil G1/4 4 → 20 mA Wire Lead 5 ms 20 mA 9 → 35 V dc - Stainless Steel
RS Stock No. 125-3725
Mfr. Part No.7MF1565-3BE00-1AA1
BrandSiemens
MYR787.16
Each
units
Gauge 0bar 4bar 0.25 % Analogue Aggressive Media, Gas, Liquid, Non-Aggressive Media, Vapour - 4 → 20 mA DIN EN 175301 Connector, M16 <5 ms 20 mA 7 → 33 V dc - Stainless Steel
RS Stock No. 448-8044
Mfr. Part No.5000BGA1000M3010A001
MYR2,606.89
Each
units
Gauge 351mbar 1000mbar 0.2 % Analogue Water/Diesel/Fuel Oil G1/4 4 → 20 mA Wire Lead 5 ms 20 mA 9 → 35 V dc - Stainless Steel
RS Stock No. 102-4131
BrandRS PRO
MYR1,094.56
Each
units
Gauge 0bar 100bar ±0.25 % Analogue Gas, Liquid BSP 1/4 4 → 20 mA DIN 46350 Connector - - 9 → 32 V dc - Stainless Steel
RS Stock No. 835-3872
Mfr. Part No.PG2458
MYR1,783.17
Each
units
Relative -12.5mbar 250mbar ±0.5 % Analogue + PNP NO/NC Programmable Gas, Liquid G1/2 4 → 20 mA M12 Connector 9 ms, 28 ms 250 mA 18 → 32 V dc - Stainless Steel
RS Stock No. 455-4747
Mfr. Part No.3100B2200S2TB000
MYR709.82
Each
units
Gauge 0bar 2200bar 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. 455-4781
Mfr. Part No.3100B0250S01E000
MYR589.63
Each
units
Gauge 0bar 250bar 0.25 % Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil G1/4 4 → 20 mA M12 Connector 1 ms - 8 → 30 V dc - -
RS Stock No. 797-0959
Mfr. Part No.31ISB0060G01R000
MYR806.38
Each
units
Gauge 0bar 60bar 0.25 % Analogue Fluid, Gas G1/4 4 → 20 mA DIN 43650 Type C 1 ms 4.5 mA 8 → 24 V dc - Stainless Steel
RS Stock No. 397-1191
Mfr. Part No.6101-0013
BrandHerga
MYR176.42
Each
units
Differential 0.7bar 16bar - Relay Fluid - - - - 5 A 250 V ac - Metal
RS Stock No. 835-3911
Mfr. Part No.PU5401
MYR557.99
Each
units
Relative 0bar 250bar ±0.5 % Analogue Gas, Liquid G1/4 0 → 10 V M12 Connector 1 ms - 16 → 36 V dc - Stainless Steel
RS Stock No. 169-0629
Mfr. Part No.MPX4250A
BrandNXP
MYR94.447
Each (In a Tray of 25)
units
Absolute 20kPa 250kPa ±1.5 % Analogue Air - 4.9 V PCB Mount 1 ms - 4.85 → 5.35 V dc - Epoxy
RS Stock No. 511-7361
Mfr. Part No.6101-0029
BrandHerga
MYR173.31
Each
units
Differential 0.87mbar 1.61mbar - - Air - - - - - 125 V ac - Fibreglass
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