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 Response Time Maximum Current Supply Voltage Interface Housing Material
RS Stock No. 828-5717
BrandRS PRO
$306.40
Each
units
Gauge 0mbar 250mbar <±0.25 % Current Oil, Water BSP 1/4 4 → 20 mA DIN 43650 Connector - 28 mA 9 → 32 V dc - Stainless Steel
RS Stock No. 123-5248
BrandRS PRO
$692.91
Each
units
Gauge 0mbar 1000mbar ±0.25 % Analogue Air, Hydraulic Fluid, Liquid, Non-Aggressive Gas, Oil, Water G1/4 0 → 5 V, 4 → 20 mA Battery - - - - Stainless Steel
RS Stock No. 828-5773
BrandRS PRO
$264.01
Each
units
Gauge 0bar 100bar <±0.25 % Current Sewage, Viscous Fluid, Water G3/4 4 → 20 mA M12 Connector - 28 mA 9 → 32 V dc - Stainless Steel
RS Stock No. 828-5704
BrandRS PRO
$371.95
Each
units
Absolute 0mbar 1000mbar <±0.5 % Current Oil, Water BSP 1/4 4 → 20 mA DIN 43650 Connector - 28 mA 9 → 32 V dc - Stainless Steel
RS Stock No. 175-5031
BrandRS PRO
$277.41
Each
units
Gauge -14.5psi 150psi ±0.25 % Analogue - NPT 1/4 0 → 5 V M12 Connector - - 9 → 32 V dc - Stainless Steel
RS Stock No. 102-4131
BrandRS PRO
$323.20
Each
units
Gauge 0bar 100bar ±0.25 % Analogue Gas, Liquid BSP 1/4 4 → 20 mA DIN 46350 Connector - - 9 → 32 V dc - Stainless Steel
RS Stock No. 175-5032
BrandRS PRO
$277.41
Each
units
Gauge -14.5psi 350psi ±0.25 % Analogue - NPT 1/4 4 → 20 mA M12 Connector - 20 mA 9 → 32 V dc - Stainless Steel
RS Stock No. 175-5026
BrandRS PRO
$358.01
Each
units
Gauge 0psi 10psi ±0.25 % Analogue - NPT 1/4 4 → 20 mA M12 Connector - 20 mA 9 → 32 V dc - Stainless Steel
RS Stock No. 828-5814
BrandRS PRO
$288.13
Each
units
Gauge -1bar 5bar <±0.25 % Current Water G3/4 4 → 20 mA M12 Connector - 28 mA 9 → 32 V dc - Stainless Steel
RS Stock No. 175-5009
BrandRS PRO
$358.01
Each
units
Gauge 0bar 100mbar ±0.25 % Analogue - BSP 1/4 0 → 5 V M12 Connector - - 9 → 32 V dc - Stainless Steel
RS Stock No. 828-5795
BrandRS PRO
$288.13
Each
units
Gauge 0bar 10bar <±0.25 % Voltage Sewage, Viscous Fluid, Water G3/4 0 → 10 V M12 Connector - 6 mA 14 → 32 V dc - Stainless Steel
RS Stock No. 175-5038
BrandRS PRO
$247.06
Each
units
Gauge 0psi 75psi ±0.25 % Analogue - NPT 1/4 4 → 20 mA M12 Connector - 20 mA 9 → 32 V dc - Stainless Steel
RS Stock No. 175-4993
BrandRS PRO
$247.06
Each
units
Gauge 0bar 25bar ±0.25 % Analogue - BSP 1/4 0 → 5 V DIN 43650 - - 9 → 32 V dc - Stainless Steel
RS Stock No. 175-5006
BrandRS PRO
$443.76
Each
units
Gauge 0bar 50mbar ±0.25 % Analogue - BSP 1/4 4 → 20 mA M12 Connector - 20 mA 9 → 32 V dc - Stainless Steel
RS Stock No. 102-4123
BrandRS PRO
$332.55
Each
units
Gauge 0bar 1bar ±0.25 % Analogue Gas, Liquid BSP 1/4 4 → 20 mA DIN 46350 Connector - - 9 → 32 V dc - Stainless Steel
RS Stock No. 175-5011
BrandRS PRO
$358.01
Each
units
Gauge 0bar 250mbar ±0.25 % Analogue - BSP 1/4 0 → 5 V M12 Connector - - 9 → 32 V dc - Stainless Steel
RS Stock No. 123-5250
BrandRS PRO
$1,123.97
Each
units
Absolute 0mbar 750mbar ±0.25 % Analogue Air, Hydraulic Fluid, Liquid, Non-Aggressive Gas, Oil, Water G1/4 0 → 5 V, 4 → 20 mA Battery - - - - Stainless Steel
RS Stock No. 175-5053
BrandRS PRO
$247.06
Each
units
Gauge 0psi 750psi ±0.25 % Analogue - NPT 1/4 0 → 5 V M12 Connector - - 9 → 32 V dc - Stainless Steel
RS Stock No. 102-4140
BrandRS PRO
$372.88
Each
units
Gauge 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 - Stainless Steel
RS Stock No. 175-5036
BrandRS PRO
$247.06
Each
units
Gauge 0psi 30psi ±0.25 % Analogue - NPT 1/4 4 → 20 mA M12 Connector - 20 mA 9 → 32 V dc - Stainless Steel
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