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. 124-1476
Mfr. Part No.46879279
BrandWIKA
TWD4,789.00
Each
units
- -1bar 9bar 0.5 % Analogue Gas, Liquid G1/4 4 → 20 mA DIN 175301-803 C - < 4 ms - 8 → 30 V dc -
RS Stock No. 879-5059
Mfr. Part No.52375455
BrandWIKA
TWD17,827.00
Each
units
Absolute, Relative 0psi 5000psi 0.25 % Current Synthetic Oil NPT 1/2 4 → 20 mA - - 3 ms 25 mA 8 → 36 V dc -
New
RS Stock No. 218-9897
Mfr. Part No.14071123
BrandWIKA
TWD9,865.00
Each
units
Gauge -1bar 0bar ± 0.25% Current (2-Wire) - - - - - - - 8 → 35 V -
New
RS Stock No. 219-7494
Mfr. Part No.12850838
BrandWIKA
TWD3,516.00
Each
units
Absolute, Gauge 0bar 100bar 0.5 % Analogue Gas, Liquid Level - - - - - - 14 → 30 V -
New
RS Stock No. 218-9905
Mfr. Part No.14071139
BrandWIKA
TWD8,480.00
Each
units
Gauge 0bar 6bar ± 0.25% Current (2-Wire) - - - - - - - 8 → 35 V -
New
RS Stock No. 218-9926
Mfr. Part No.14071248
BrandWIKA
TWD8,480.00
Each
units
Gauge 0bar 60bar ± 0.25% Current (2-Wire) - - - - - - - 8 → 35 V -
New
RS Stock No. 218-9922
Mfr. Part No.14071237
BrandWIKA
TWD8,480.00
Each
units
Gauge 0bar 10bar ± 0.25% Current (2-Wire) - - - - - - - 8 → 35 V -
New
RS Stock No. 218-9898
Mfr. Part No.14071126
BrandWIKA
TWD11,077.00
Each
units
Gauge 0bar 0.4bar ± 0.25% Current (2-Wire) - - - - - - - 8 → 35 V -
RS Stock No. 879-5194
Mfr. Part No.50372483
BrandWIKA
TWD7,366.00
Each
units
- 0psi 5000psi ±1 % Analogue Oil NPT 1/4 4 → 20 mA - - <4 ms 25 mA 8 → 30 V dc -
RS Stock No. 124-1468
Mfr. Part No.46879225
BrandWIKA
TWD4,789.00
Each
units
- 0bar 10bar 0.5 % Analogue Gas, Liquid G1/4 0 → 5 V DIN 175301-803 C - < 4 ms - 8 → 30 V dc -
New
RS Stock No. 219-7504
Mfr. Part No.12963446
BrandWIKA
TWD3,516.00
Each
units
Absolute, Gauge 0bar 1.6bar 0.5 % Analogue Gas, Liquid Level - - - - - - 14 → 30 V -
RS Stock No. 205-1268
Mfr. Part No.46967528
BrandWIKA
TWD3,827.00
Each
units
Absolute 0bar 6bar 1 % PNP Air, Fluids, Gases - - - - - - 10 → 32 V IO-Link
New
RS Stock No. 218-9902
Mfr. Part No.14071135
BrandWIKA
TWD8,480.00
Each
units
Gauge 0bar 2.5bar ± 0.25% Current (2-Wire) - - - - - - - 8 → 35 V -
RS Stock No. 190-9703
Mfr. Part No.9021264
BrandWIKA
TWD18,878.00
Each
units
- 0bar 0.25bar ±0.5 % Current Adhesive, Contaminated Media, Crystallising, Particle-Laden, Paste-Like, Viscous - 4 → 20 mA Angular connector DIN 175301-803 A - - 20 mA 10 → 30 V dc -
RS Stock No. 879-5481
Mfr. Part No.8341155
BrandWIKA
TWD19,605.00
Each
units
Relative 0psi 160psi ≤0.25 (BFSL) %, ≤0.5 (Limit Point Calibration) % Analogue Oil NPT 1/2 4 → 20 mA - - ≤1 ms - 10 → 30 V dc -
RS Stock No. 124-1469
Mfr. Part No.46879358
BrandWIKA
TWD10,521.00
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. 124-1463
Mfr. Part No.46879222
BrandWIKA
TWD4,789.00
Each
units
- 0bar 10bar 0.5 % Analogue Gas, Liquid G1/4 4 → 20 mA DIN 175301-803 C - < 4 ms - 8 → 30 V dc -
New
RS Stock No. 218-9910
Mfr. Part No.14071146
BrandWIKA
TWD8,480.00
Each
units
Gauge 0bar 60bar ± 0.25% Current (2-Wire) - - - - - - - 8 → 35 V -
New
RS Stock No. 219-7495
Mfr. Part No.12852822
BrandWIKA
TWD3,516.00
Each
units
Absolute, Gauge 0bar 1bar 0.5 % Analogue Gas, Liquid Level - - - - - - 14 → 30 V -
New
RS Stock No. 219-7480
Mfr. Part No.12725057
BrandWIKA
TWD3,516.00
Each
units
Absolute, Gauge 0bar 10bar 0.5 % Analogue Gas, Liquid Level - - - - - - 14 → 30 V -