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. 725-5945
Mfr. Part No.12719316
BrandWIKA
£106.05
Each
Units
Gauge 0bar 40bar 0.5 % Current Hydraulic Fluid - - 4 → 20 mA - - - - 8 → 30 V dc
RS Stock No. 124-1469
Mfr. Part No.46879358
BrandWIKA
£226.74
Each
Units
- 0bar 10bar 0.5 % Analogue Gas, Liquid - G1/4 4 20 mA DIN 175301-803 A - < 2 ms - 10 30 V dc
RS Stock No. 124-1471
Mfr. Part No.46879242
BrandWIKA
£103.22
Each
Units
- 0bar 40bar 0.5 % Analogue Gas, Liquid - G1/4 4 20 mA DIN 175301-803 C - < 4 ms - 8 30 V dc
RS Stock No. 879-5181
Mfr. Part No.50426516
BrandWIKA
£158.75
Each
Units
- 0psi 3000psi ≤±1 (0.5 Non-Linearity) % Analogue Oil - - 4 20 mA - - <4 ms 25 mA 8 30 V dc
RS Stock No. 124-1484
Mfr. Part No.46879288
BrandWIKA
£103.22
Each
Units
- 0bar 1bar 0.5 % Analogue Gas, Liquid - G1/4 4 20 mA DIN 175301-803 C - < 4 ms - 8 30 V dc
RS Stock No. 124-1482
Mfr. Part No.46879286
BrandWIKA
£103.22
Each
Units
- 0bar 6bar 0.5 % Analogue Gas, Liquid - G1/4 4 20 mA DIN 175301-803 C - < 4 ms - 8 30 V dc
RS Stock No. 124-1487
Mfr. Part No.46882609
BrandWIKA
£142.06
Each
Units
- 0bar 1bar 0.25 % Analogue Gas, Liquid - G1/4 4 20 mA DIN 175301-803 A - < 3 ms - 8 35 V dc
RS Stock No. 124-1475
Mfr. Part No.46879424
BrandWIKA
£106.07
Each
Units
- 0bar 10bar 0.5 % Analogue Gas, Liquid - G1/4 4 20 mA DIN 175301-803 A - < 4 ms - 8 30 V dc
RS Stock No. 124-1468
Mfr. Part No.46879225
BrandWIKA
£103.22
Each
Units
- 0bar 10bar 0.5 % Analogue Gas, Liquid - G1/4 0 5 V DIN 175301-803 C - < 4 ms - 8 30 V dc
RS Stock No. 124-1463
Mfr. Part No.46879222
BrandWIKA
£103.22
Each
Units
- 0bar 10bar 0.5 % Analogue Gas, Liquid - G1/4 4 → 20 mA DIN 175301-803 C - < 4 ms - 8 → 30 V dc
RS Stock No. 124-1466
Mfr. Part No.46879357
BrandWIKA
£226.74
Each
Units
- 0bar 2.5bar 0.5 % Analogue Gas, Liquid - G1/4 4 20 mA DIN 175301-803 A - < 2 ms - 10 30 V dc
RS Stock No. 124-1485
Mfr. Part No.14076933
BrandWIKA
£142.06
Each
Units
- 0bar 10bar 0.25 % Analogue Gas, Liquid - G1/4 4 20 mA DIN 175301-803 A - < 3 ms - 8 35 V dc
RS Stock No. 124-1464
Mfr. Part No.46879445
BrandWIKA
£378.71
Each
Units
- 0psi 8.5psi 0.5 % Analogue Liquid - - 4 20 mA PUR Cable (15 metres) - - - 10 30 V dc
RS Stock No. 124-1470
Mfr. Part No.46879227
BrandWIKA
£103.22
Each
Units
- 0bar 250bar 0.5 % Analogue Gas, Liquid - G1/4 4 20 mA DIN 175301-803 C - < 4 ms - 8 30 V dc
RS Stock No. 124-1473
Mfr. Part No.46879278
BrandWIKA
£103.22
Each
Units
- 0bar 160bar 0.5 % Analogue Gas, Liquid - G1/4 4 20 mA DIN 175301-803 C - < 4 ms - 8 30 V dc
RS Stock No. 124-1480
Mfr. Part No.46879362
BrandWIKA
£226.74
Each
Units
- 0bar 1bar 0.5 % Analogue Gas, Liquid - G1/4 4 20 mA DIN 175301-803 A - < 2 ms - 10 30 V dc
RS Stock No. 124-1478
Mfr. Part No.46879280
BrandWIKA
£103.22
Each
Units
- 0bar 400bar 0.5 % Analogue Gas, Liquid - G1/4 4 20 mA DIN 175301-803 C - < 4 ms - 8 30 V dc
RS Stock No. 124-1486
Mfr. Part No.46882608
BrandWIKA
£142.06
Each
Units
- 0bar 6bar 0.25 % Analogue Gas, Liquid - G1/4 4 20 mA DIN 175301-803 A - < 3 ms - 8 35 V dc
RS Stock No. 124-1474
Mfr. Part No.46879245
BrandWIKA
£99.04
Each
Units
- 0bar 400bar 0.5 % Analogue Gas, Liquid - G1/4 4 20 mA M12 x 1 - < 4 ms - 8 30 V dc
RS Stock No. 124-1465
Mfr. Part No.46879223
BrandWIKA
£103.22
Each
Units
- 0bar 16bar 0.5 % Analogue Gas, Liquid - G1/4 4 20 mA DIN 175301-803 C - < 4 ms - 8 30 V dc