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 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 - Like 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. 395-7123
Mfr. Part No.2600BGA2519M3JA003
HK$4,398.68
Each
units
Relative 0bar 2.5bar 0.25 % - - - 4 → 20 mA Wire Lead - 0.5 ms - 7 → 35 V dc -
RS Stock No. 739-6724
Mfr. Part No.PK7521
HK$1,653.47
Each
units
Relative 0bar 250bar <±2.5 % 2NO Gas, Liquid G1/4 - M12 Connector - - 500 mA 9.6 → 32 V dc -
RS Stock No. 398-6991
Mfr. Part No.0184458031042
BrandSuco
HK$602.76
Each
units
- 1bar 10bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine G1/4 - DIN 46350 Connector - - 4 A 250 V -
RS Stock No. 518-4428
BrandRS PRO
HK$1,120.32
Each
units
Gauge 0bar 6bar ≤0.5 % Analogue Gas, Liquid G1/4 4 → 20 mA M12 Connector - ≤3 ms - 10 → 30 V dc -
RS Stock No. 317-443
Mfr. Part No.6753-0002
BrandHerga
HK$334.73
Each
units
- - 0.072psi ±2.5 % - Air - - Spade Terminal - - - 250 V ac -
RS Stock No. 398-7045
Mfr. Part No.0166407031027
BrandSuco
HK$278.49
Each
units
- 1bar 10bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine G1/4 - Spade Terminal - - - 42 V -
RS Stock No. 410-6231
Mfr. Part No.404304/000-414-406-02-298
BrandJumo
HK$2,739.46
Each
units
Differential, Gauge 0bar 0.1bar - Analogue Non-Aggressive Gas 6 mm Tube 4 → 20 mA M12 Connector - - - 230 V ac -
RS Stock No. 797-5021
BrandRS PRO
HK$1,430.35
Each
units
Relative 0bar 100bar ±0.25 % Current Air, Gas, Hydraulic Fluid, Liquid, Water G1/4 4 → 20 mA DIN 43650 Type C - - 20 mA 9 → 32 V dc -
RS Stock No. 820-7035
Mfr. Part No.6742-0052
BrandHerga
HK$560.14
Each
units
- 60psi 120psi ±10 % SPCO Air, Gas, Liquid, Oil BSP 1/8 - Spade Terminal - - 21 A 220 V dc, 250 V ac -
RS Stock No. 795-4711
Mfr. Part No.3100R0010G01B000
HK$1,131.39
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. 455-4624
Mfr. Part No.3100B0010G01B000
HK$1,131.38
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. 797-5052
BrandRS PRO
HK$1,648.24
Each
units
Relative 0bar 25bar ±0.25 % Voltage Air, Gas, Hydraulic Fluid, Liquid, Water G1/4 0 → 100 mV DIN 43650 Type C - - - 3 → 12 V dc -
RS Stock No. 302-5838
Mfr. Part No.XMLA010A2S11
HK$1,444.03
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 -
RS Stock No. 399-1612
Mfr. Part No.XMAV06L2135
HK$743.76
Each
units
Differential 1bar 6bar 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 -
RS Stock No. 748-4723
Mfr. Part No.ZSE40AF-01-R
BrandSMC
HK$1,654.55
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. 746-3492
Mfr. Part No.X5072-TB-A1-CA-H1-PA 100 bar SG
BrandDruck
HK$2,952.26
Each
units
Relative - 100bar ±0.2 % Analogue Fluid G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V -
RS Stock No. 739-6715
Mfr. Part No.PK7520
HK$1,426.82
Each
units
Relative 0bar 400bar <±2.5 % 2NO Gas, Liquid G1/4 - M12 Connector - - 500 mA 9.6 → 32 V dc -
RS Stock No. 455-4804
Mfr. Part No.3100B0600S01E000
HK$1,058.20
Each
units
- 0bar 600bar 0.25 % - Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil G1/4 4 → 20 mA M12 Connector - - - 10 → 36 V dc -
RS Stock No. 835-2851
Mfr. Part No.XMLR250M1N25
HK$4,770.36
Each
units
Differential 0bar 250bar ≤0.1 % Analogue, 1 x NPN Air, Fresh Water, Hydraulic Oil, Refrigerator Fluid G1/4 4 → 20 mA M12 Connector - ≤10 (Analogue) ms, ≤5 (Discrete) ms ≤50 mA 24 V dc -
RS Stock No. 914-8369
Mfr. Part No.DP101EP
BrandPanasonic
HK$830.37
Each
units
Gauge -1bar 10bar ±1 % Relay Non-Corrosive Gas G1/8 100 mA Wire Lead - 2.5 ms - 12 → 24 V dc -