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. 774-4097
Mfr. Part No.SDP1000-L05
BrandSensirion
SGD141.01
Each
units
Differential -5Pa 125Pa 0.3 %, 2 % Analogue Air, Non-Aggressive Gas - 0.25 → 4 V 3 Pin SMD Connector 40 ms 5.2 mA 4.75 → 5.25 V - PPS
RS Stock No. 173-2219
Mfr. Part No.SDP1000-L05
BrandSensirion
SGD111.511
Each (In a Tray of 25)
units
Differential -5Pa 125Pa 0.3 %, 2 % Analogue Air, Non-Aggressive Gas - 0.25 → 4 V 3 Pin SMD Connector 40 ms 5.2 mA 4.75 → 5.25 V - PPS
RS Stock No. 173-2221
Mfr. Part No.SDP2000-L
BrandSensirion
SGD111.511
Each (In a Tray of 25)
units
Differential -100Pa 3500Pa 0.2 %, 1.5 % Analogue Air, Non-Aggressive Gas - 0.25 → 4 V 3 Pin SMD Connector 40 ms 5.2 mA 4.75 → 5.25 V - PPS
RS Stock No. 774-4091
Mfr. Part No.SDP2000-L
BrandSensirion
SGD128.77
Each
units
Differential -100Pa 3500Pa 0.2 %, 1.5 % Analogue Air, Non-Aggressive Gas - 0.25 → 4 V 3 Pin SMD Connector 40 ms 5.2 mA 4.75 → 5.25 V - PPS
RS Stock No. 173-2212
Mfr. Part No.SDP600-025PA
BrandSensirion
SGD38.724
Each (In a Tray of 80)
units
Differential -25Pa 25Pa 3 % I2C Air, Nitrogen Gas, Oxygen Gas 5.2 mm Tube - - 4.6 ms <6 mA 3.6 V - PBT
RS Stock No. 123-7136
Mfr. Part No.SDP600-025Pa
BrandSensirion
SGD41.73
Each
units
Differential -25Pa 25Pa 3 % I2C Air, Nitrogen Gas, Oxygen Gas 5.2 mm Tube - - 4.6 ms <6 mA 3.6 V - PBT
RS Stock No. 774-4085
Mfr. Part No.SDP1000-L
BrandSensirion
SGD117.38
Each
units
Differential -20Pa 500Pa 0.2 %, 1.5 % Analogue Air, Non-Aggressive Gas - 0.25 → 4 V 3 Pin SMD Connector 40 ms 5.2 mA 4.75 → 5.25 V - PPS
RS Stock No. 173-2220
Mfr. Part No.SDP1000-L
BrandSensirion
SGD111.511
Each (In a Tray of 25)
units
Differential -20Pa 500Pa 0.2 %, 1.5 % Analogue Air, Non-Aggressive Gas - 0.25 → 4 V 3 Pin SMD Connector 40 ms 5.2 mA 4.75 → 5.25 V - PPS
RS Stock No. 173-2215
Mfr. Part No.SDP610-125PA
BrandSensirion
SGD38.724
Each (In a Tray of 80)
units
Differential -125Pa 125Pa 3 % I2C Air, Nitrogen Gas, Oxygen Gas 5.2 mm Tube - - 4.6 ms <6 mA 3.6 V - PBT
RS Stock No. 774-4101
Mfr. Part No.SDP610-025Pa
BrandSensirion
SGD38.11
Each
units
Differential -25Pa 25Pa 3 % I2C Air, Non-Aggressive Gas - - 4 Pin SMD Connector 4.6 ms 6 mA 2.7 → 3.3 V dc - PBT
RS Stock No. 123-7141
Mfr. Part No.SDP610-125Pa
BrandSensirion
SGD49.03
Each
units
Differential -125Pa 125Pa 3 % I2C Air, Nitrogen Gas, Oxygen Gas 5.2 mm Tube - - 4.6 ms <6 mA 3.6 V - PBT
RS Stock No. 123-7142
Mfr. Part No.SDP611
BrandSensirion
SGD49.03
Each
units
Differential -500Pa 500Pa 3 % I2C Air, Nitrogen Gas, Oxygen Gas 5.2 mm Tube - - 4.6 ms <6 mA 3.6 V - PBT
RS Stock No. 173-2216
Mfr. Part No.SDP611
BrandSensirion
SGD38.724
Each (In a Tray of 80)
units
Differential -500Pa 500Pa 3 % I2C Air, Nitrogen Gas, Oxygen Gas 5.2 mm Tube - - 4.6 ms <6 mA 3.6 V - PBT
RS Stock No. 174-9068
Mfr. Part No.SDP33-1500Pa-TR-250pcs
BrandSensirion
SGD32.217
Each (On a Reel of 250)
units
Differential -1500Pa 1500Pa 6 % I2C Air, N2, O2 2 mm Tube - - 3 ms 5.5 mA 5.5 V - Epoxy-Based Resin, Glass, LCP
RS Stock No. 774-4094
Mfr. Part No.SDP1000-L025
BrandSensirion
SGD166.32
Each
units
Differential -62Pa 62Pa 0.6 %, 2 % Analogue Air, Non-Aggressive Gas - 0.2 → 4 V 3 Pin SMD Connector 40 ms 5.2 mA 4.75 → 5.25 V - PPS
RS Stock No. 123-7145
Mfr. Part No.ASP1400
BrandSensirion
SGD424.58
Each
units
Differential -100Pa 100Pa 1.5 % RS-232 Gas 6 mm Tube - - 1280 ms 27 mA 18 V dc - -
RS Stock No. 173-2222
Mfr. Part No.SDP1000-L025
BrandSensirion
SGD133.586
Each (In a Tray of 25)
units
Differential -62Pa 62Pa 0.6 %, 2 % Analogue Air, Non-Aggressive Gas - 0.2 → 4 V 3 Pin SMD Connector 40 ms 5.2 mA 4.75 → 5.25 V - PPS
RS Stock No. 174-9069
Mfr. Part No.SDP33-1500Pa-TR-250pcs
BrandSensirion
SGD42.76
Each
units
Differential -1500Pa 1500Pa 6 % I2C Air, N2, O2 2 mm Tube - - 3 ms 5.5 mA 5.5 V - Epoxy-Based Resin, Glass, LCP
RS Stock No. 774-4104
Mfr. Part No.SDP610-500Pa
BrandSensirion
SGD56.81
Each
units
Differential -500Pa 500Pa 3 % I2C Air, Non-Aggressive Gas - - 4 Pin SMD Connector 4.6 ms 6 mA 2.7 → 3.3 V dc - PBT
RS Stock No. 173-2211
Mfr. Part No.SDP601
BrandSensirion
SGD38.724
Each (In a Tray of 80)
units
Differential -500Pa 500Pa 3 % I2C Air, Nitrogen Gas, Oxygen Gas 5.2 mm Tube - - 4.6 ms <6 mA 3.6 V - PBT