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 Calibrated Process Connection Analogue Output Electrical Connection Communication Protocol Response Time Maximum Current Supply Voltage
RS Stock No. 395-7117
Mfr. Part No.2600BGA1019M3HA018
£362.50
Each
Units
Relative 0bar 1bar 0.25 % Amplified - - - 4 → 20 mA Wire Lead - 0.5 ms 20 mA 7 → 35 V dc
RS Stock No. 125-3724
Mfr. Part No.7MF1565-3BD00-1AA1
BrandSiemens
£143.00
Each
Units
Relative 0bar 2.5bar 0.25 % Analogue Aggressive Media, Gas, Liquid, Non-Aggressive Media, Vapour - G1/2 4 → 20 mA DIN EN 175301 Connector, M16 - <5 ms 20 mA 7 → 33 V dc
RS Stock No. 746-3600
Mfr. Part No.X5072-TB-A2-CA-H1-PA -1 to 1.6 bar G
BrandDruck
£256.00
Each
Units
Relative -1bar 1.6bar ±0.1 % Analogue Fluid - G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 259-6654
Mfr. Part No.6742-0038
BrandHerga
£29.20
Each
Units
- 3psi 5.5psi - Relay - - - - Spade Terminal - - - 250 V ac
RS Stock No. 779-4232
Mfr. Part No.PS61-40-4MGZ-B-SP
£24.95
Each
Units
- 150psi 500psi - SPST-NC Hydraulic - BSP 1/4 - Spade Terminal - - 100 VA 42 V dc
RS Stock No. 124-2128
Mfr. Part No.9013FSG2J24
BrandSquare D
£28.18
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. 124-2169
Mfr. Part No.XMPA06C2374N
£42.00
Each
Units
Differential 1 (Rising)bar 6 (Rising)bar <3.5 (Repeat) % 3NC Air, Fresh Water, Sea Water - G1/2 - Screw Clamp - - - -
RS Stock No. 511-7361
Mfr. Part No.6101-0029
BrandHerga
£30.05
Each
Units
Differential 0.87mbar 1.61mbar - - Air - - - - - - - 125 V ac
RS Stock No. 746-3489
Mfr. Part No.X5072-TB-A1-CA-H1-PA 25.0 bar G
BrandDruck
£198.00
Each
Units
Relative - 25bar ±0.2 % Analogue Fluid - G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 123-6668
Mfr. Part No.X5072-TB-A1-CA-H1-PA 25.0 bar G
BrandDruck
£282.00
Each
Units
Gauge - 25bar ±0.2 % Analogue Fluid RSCAL G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 779-4200
Mfr. Part No.PS61-10-4MGZ-A-SP
£24.95
Each
Units
- 15psi 60psi - SPST-NO Hydraulic - BSP 1/4 - Spade Terminal - - 100 VA 42 V dc
RS Stock No. 795-4730
Mfr. Part No.3100R0250S01B000
£96.50
Each
Units
Relative 0bar 250bar ±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. 259-6632
Mfr. Part No.6721-0021
BrandHerga
£23.68
Each
Units
- -270in wg -75in wg - Relay - - - - Spade Terminal - - - 250 V ac
RS Stock No. 795-4737
Mfr. Part No.3100B0010G05G000
£102.00
Each
Units
Gauge 0bar 10bar ±0.25 % Current Fluid, Gas - G1/4 4 → 20 mA DIN 43650 Type A - 1 ms 20 mA 8 → 30 V dc
RS Stock No. 181-1356
Mfr. Part No.24PCBFA2G
BrandHoneywell
£27.68
Each
Units
Relative 0psi 5psi 0.2 % Wheatstone Bridge Nitrogen Gas, Oxygen, Water - - 0 → 115 mV Solder Tag - 1 ms - 2.5 → 12 V dc
RS Stock No. 795-4721
Mfr. Part No.3100R0100S01B000
£96.50
Each
Units
Relative 0bar 100bar ±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. 235-5778
Mfr. Part No.24PCEFA6D
BrandHoneywell
£27.52
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. 124-2141
Mfr. Part No.XMLP2D5GD71F
£100.00
Each
Units
- 0bar 2.5bar ±0.1 (Repeat) %, ±0.5 (Measurement) % Analogue Air, Fresh Water, Gas, Hydraulic Oil - G1/4 0 → 10 V M12 4-Pin Connector - ≤2 ms <7 mA 24 V dc
RS Stock No. 818-4623
Mfr. Part No.D6F-PH0505AD3
BrandOmron
£27.98
Each
Units
Differential -50Pa 50Pa ±3 % I2C Air - - - PCB - 33 ms 6 mA 2.3 → 3.6 V dc
RS Stock No. 124-2131
Mfr. Part No.XMLA160E2S11
£159.60
Each
Units
Differential 10 (Rising) bar, 4.5 (Falling) bar 142 (Falling) bar, 160 (Rising) bar <2 (Repeat) % 1CO Fresh Water - G1/4 - Screw Clamp - - 3 A 240 V ac, 250 V dc