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 Communication Protocol Response Time Maximum Current Supply Voltage Interface
RS Stock No. 797-5015
BrandRS PRO
SGD294.76
Each
units
Relative 0bar 25bar ±0.25 % Current Air, Gas, Hydraulic Fluid, Liquid, Water BSP 1/4 4 → 20 mA DIN 43650 Connector - - 20 mA 9 → 32 V dc -
RS Stock No. 797-5018
BrandRS PRO
SGD280.03
Each
units
Relative 0bar 10bar ±0.25 % Current Air, Gas, Hydraulic Fluid, Liquid, Water BSP 1/4 4 → 20 mA DIN 43650 Connector - - 20 mA 9 → 32 V dc -
RS Stock No. 102-4132
BrandRS PRO
SGD364.03
Each
units
Relative 0bar 250bar ±0.25 % Analogue Gas, Liquid BSP 1/4 4 → 20 mA DIN 46350 Connector - - - 9 → 32 V dc -
RS Stock No. 828-5701
BrandRS PRO
SGD308.55
Each
units
Relative 0bar 50mbar <±0.25 % Voltage Oil, Water BSP 1/4 0.5 → 4.5 V DIN 43650 Connector - - 6 mA 9 → 32 V dc -
RS Stock No. 102-4126
BrandRS PRO
SGD364.03
Each
units
Relative 0bar 10bar ±0.25 % Analogue Gas, Liquid BSP 1/4 4 → 20 mA DIN 46350 Connector - - - 9 → 32 V dc -
RS Stock No. 102-4141
BrandRS PRO
SGD656.77
Each
units
Relative 0bar 20bar ±0.25 % Analogue Grey Water, Sewage, Viscous Fluid BSP 3/4 4 → 20 mA M12 4-pin - - 28 mA 12 → 28 V dc -
RS Stock No. 102-4128
BrandRS PRO
SGD408.80
Each
units
Relative -1bar 24bar ±0.25 % Analogue Gas, Liquid BSP 1/4 4 → 20 mA DIN 46350 Connector - - - 9 → 32 V dc -
RS Stock No. 797-5033
BrandRS PRO
SGD294.76
Each
units
Relative 0bar 40bar ±0.25 % Voltage Air, Gas, Hydraulic Fluid, Liquid, Water BSP 1/4 0 → 5 V DIN 43650 Connector - - - 9 → 32 V dc -
RS Stock No. 828-5723
BrandRS PRO
SGD254.64
Each
units
Relative 0bar 500mbar <±0.25 % Voltage Oil, Water BSP 1/4 0.5 → 4.5 V DIN 43650 Connector - - 6 mA 9 → 32 V dc -
RS Stock No. 102-4145
BrandRS PRO
SGD656.77
Each
units
Relative -1bar 1bar ±0.25 % Analogue Grey Water, Sewage, Viscous Fluid BSP 3/4 4 → 20 mA M12 4-pin - - 28 mA 12 → 28 V dc -
RS Stock No. 102-4125
BrandRS PRO
SGD408.80
Each
units
Relative -1bar 9bar ±0.25 % Analogue Gas, Liquid BSP 1/4 4 → 20 mA DIN 46350 Connector - - - 9 → 32 V dc -
RS Stock No. 828-5820
BrandRS PRO
SGD324.50
Each
units
Absolute 0bar 1bar <±0.25 % Current Sewage, Viscous Fluid, Water G3/4 4 20 mA M12 Connector - - 28 mA 9 32 V dc -
RS Stock No. 828-5741
BrandRS PRO
SGD210.49
Each
units
Relative 0bar 16bar <±0.25 % Current Air, Gas, Hydraulic Fluid, Liquid, Water BSP 1/4 4 → 20 mA DIN 43650 Connector - - 20 mA 9 → 32 V dc -
RS Stock No. 102-4156
BrandRS PRO
SGD630.85
Each
units
Relative 0bar 500mbar ±0.25 % Analogue Oil BSP 1/4 4 → 20 mA DIN 46350 Connector - - 28 mA 9 → 32 V dc -
RS Stock No. 102-4152
BrandRS PRO
SGD656.77
Each
units
Absolute 0bar 10bar ±0.25 % Analogue Grey Water, Sewage, Viscous Fluid BSP 3/4 4 → 20 mA M12 4-pin - - 28 mA 12 → 28 V dc -
RS Stock No. 102-4133
BrandRS PRO
SGD425.65
Each
units
Relative 0bar 400bar ±0.25 % Analogue Gas, Liquid BSP 1/4 4 → 20 mA DIN 46350 Connector - - - 9 → 32 V dc -
RS Stock No. 797-5011
BrandRS PRO
SGD280.03
Each
units
Relative 0bar 6bar ±0.25 % Current Air, Gas, Hydraulic Fluid, Liquid, Water BSP 1/4 4 → 20 mA DIN 43650 Connector - - 20 mA 9 → 32 V dc -
RS Stock No. 102-4139
BrandRS PRO
SGD696.57
Each
units
Relative 0bar 5bar ±0.25 % Analogue Grey Water, Sewage, Viscous Fluid BSP 3/4 4 → 20 mA M12 4-pin - - 28 mA 12 → 28 V dc -
RS Stock No. 102-4144
BrandRS PRO
SGD656.77
Each
units
Relative 0bar 100bar ±0.25 % Analogue Grey Water, Sewage, Viscous Fluid BSP 3/4 4 → 20 mA M12 4-pin - - 28 mA 12 → 28 V dc -
RS Stock No. 828-5791
BrandRS PRO
SGD324.50
Each
units
Relative 0bar 5bar <±0.25 % Voltage Sewage, Viscous Fluid, Water G3/4 0 → 10 V M12 Connector - - 6 mA 14 → 32 V dc -
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