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. 111-5919
Mfr. Part No.PX3AN2BS250PAAAX
BrandHoneywell
SGD86.55
Each
units
Absolute 0psi 250psi ±0.25 % Analogue Air, Brake Fluid, Hydraulic Fluid, Oil, Refrigeration Fluid NPT 1/8 0.5 → 4.5 V Metri-Pack 150 - <2 ms 3 mA 4.75 → 5.25 V dc -
RS Stock No. 235-5778
Mfr. Part No.24PCEFA6D
BrandHoneywell
SGD53.10
Each
units
Differential 0psi 0.5psi 0.2 % Unamplified Nitrogen Gas, Oxygen, Water - 25 → 45 mV Solder Tag - 1 ms - 10 V dc -
RS Stock No. 286-686
Mfr. Part No.26PCBFA6D
BrandHoneywell
SGD57.26
Each
units
Differential 0psi 5psi ±0.25 % Unamplified Nitrogen Gas, Oxygen - 47 → 53 mV 4-Pin Connector - 1 ms - 10 V dc -
RS Stock No. 181-1340
Mfr. Part No.24PCAFA2G
BrandHoneywell
SGD41.37
Each
units
Gauge 0psi 1psi ±0.2 % Wheatstone Bridge Nitrogen Gas, Oxygen, Water - 0 35 mV Solder Tag - 1 ms - 2.5 12 V dc -
RS Stock No. 177-5945
Mfr. Part No.SCX100DN
BrandHoneywell
SGD195.707
Each (In a Box of 25)
units
Differential 0psi 100psi ±1 % Wheatstone Bridge Pneumatic Fluid - 0 → 100 mV Solder Tag - 100 μs - 20 V dc -
RS Stock No. 455-5100
Mfr. Part No.SCX100DN
BrandHoneywell
SGD228.30
Each
units
Differential 0psi 100psi ±0.1 % Unamplified Pneumatic Fluid - 99 → 101 mV Solder Tag - 100 ms - 20 V dc -
RS Stock No. 181-2090
Mfr. Part No.142PC01D
BrandHoneywell
SGD524.80
Each
units
Differential 0psi 1psi ±0.75 % Amplified Gas - 1 6 V PCB - 1 ms 20 mA 7 16 V dc -
RS Stock No. 169-7680
Mfr. Part No.26PCDFA2G
BrandHoneywell
SGD57.173
Each (In a Box of 25)
units
Gauge 0psi 30psi ±0.25 % Wheatstone Bridge Nitrogen Gas, Oxygen - 0 → 100 mV PCB - 1 ms - 2.5 → 16 V dc -
RS Stock No. 169-7636
Mfr. Part No.164PC01D76
BrandHoneywell
SGD724.472
Each (In a Box of 30)
units
Differential 0in wg 5in wg ±2 % Amplified Gas - 5.9 → 6.1 V Solder Tag - 1 ms - 8 V dc -
RS Stock No. 293-8323
Mfr. Part No.40PC001B1A
BrandHoneywell
SGD100.84
Each
units
Gauge -50mm Hg 50mm Hg ±0.4 % Amplified Gas - 0.5 4.5 V PCB - 1 ms 10 mA 4.75 5.25 V dc -
RS Stock No. 395-235
Mfr. Part No.164PC01D76
BrandHoneywell
SGD794.30
Each
units
Differential 0in wg 5in wg ±2 % Amplified Gas - 5.9 → 6.1 V Solder Tag - 1 ms - 8 V dc -
RS Stock No. 655-8189
Mfr. Part No.26PCDF A2G
BrandHoneywell
SGD71.91
Each
units
Gauge 0psi 30psi ±0.1 % Wheatstone Bridge Nitrogen Gas, Oxygen, Water - 100 mV dc PCB - 1 ms - 10 V dc -
RS Stock No. 235-5835
Mfr. Part No.24PCCFA6D
BrandHoneywell
SGD53.10
Each
units
Differential 0psi 15psi 0.2 % Unamplified Nitrogen Gas, Oxygen, Water - 165 → 285 mV Solder Tag - 1 ms - 10 V dc -
RS Stock No. 286-709
Mfr. Part No.26PCDFA6D
BrandHoneywell
SGD71.91
Each
units
Differential 0psi 30psi ±0.25 % Unamplified Nitrogen Gas, Oxygen - 97 → 103 mV PCB - 1 ms - 10 V dc -
RS Stock No. 407-237
Mfr. Part No.PBN1B332-R7
BrandHoneywell
SGD112.76
Each
units
Gauge 127mbar 1.036bar - Relay Air - - Tab - - 40 mA 30 V ac/dc -
RS Stock No. 395-285
Mfr. Part No.176PC14HD2
BrandHoneywell
SGD1,156.04
Each
units
Differential 0in wg 14in wg ±3 % Unamplified Gas - 33 → 37 mV PCB - 1 ms - 10 V dc -
RS Stock No. 286-658
Mfr. Part No.26PCBFA6G
BrandHoneywell
SGD63.90
Each
units
Gauge 0psi 5psi ±0.25 % Unamplified Nitrogen Gas, Oxygen - 47 → 53 mV PCB - 1 ms - 10 V dc -
RS Stock No. 111-5920
Mfr. Part No.PX3AN2BS100PAAAX
BrandHoneywell
SGD77.11
Each
units
Absolute 0psi 100psi ±0.25 % Analogue Air, Brake Fluid, Hydraulic Fluid, Oil, Refrigeration Fluid NPT 1/8 0.5 → 4.5 V Metri-Pack 150 - <2 ms 3 mA 4.75 → 5.25 V dc -
RS Stock No. 286-664
Mfr. Part No.26PCCFA6G
BrandHoneywell
SGD55.27
Each
units
Gauge 0psi 15psi ±0.25 % Unamplified Nitrogen Gas, Oxygen - 97 → 103 mV PCB - 1 ms - 10 V dc -
RS Stock No. 455-5166
Mfr. Part No.SDX01D4
BrandHoneywell
SGD119.06
Each
units
Differential 0psi 1psi ±0.2 % Unamplified Gas - 17.37 → 18.18 mV PCB - 100 μs - 20 V dc -