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. 448-8094
Mfr. Part No.0184457031-SS
BrandSuco
HK$864.32
Each
units
- 0.5bar 5bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine G1/4 - DIN 46350 Connector - 4 A 250 V - Stainless Steel
RS Stock No. 797-4983
BrandRS PRO
HK$1,366.84
Each
units
Gauge 0bar 1bar ±0.25 % Current Air, Gas, Hydraulic Fluid, Liquid, Water BSP 1/4 4 → 20 mA DIN 43650 Connector - 20 mA 9 → 32 V dc - Stainless Steel
RS Stock No. 914-8372
Mfr. Part No.DP102A
BrandPanasonic
HK$1,024.65
Each
units
Gauge -0.1MPa 1MPa - Analogue + PNP-NO/NC Programmable Non-Corrosive Gas G1/8 0.6 → 5 V, 2.4 → 20 mA Wire Lead 5000 ms 100 mA 12 → 24 V dc - PBT
RS Stock No. 797-4964
BrandRS PRO
HK$1,175.93
Each
units
Gauge 0bar 16bar ±0.25 % Voltage Air, Gas, Hydraulic Fluid, Liquid, Water BSP 1/4 0 → 100 mV DIN 43650 Connector - - 3 → 12 V dc - Stainless Steel
RS Stock No. 774-4085
Mfr. Part No.SDP1000-L
BrandSensirion
HK$710.89
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
HK$613.114
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. 667-0914
Mfr. Part No.40PC100G2A
BrandHoneywell
HK$607.23
Each
units
Gauge 0psi 100psi 0.8 % Amplified Gas - 0.5 mA PCB 1 ms - 5 V dc - -
RS Stock No. 313-5373
Mfr. Part No.14X1IA1GV1
BrandVega
HK$2,126.99
Each
units
Gauge 0bar 40bar 0.3 % - Fluid, Gas, Vapour G1/2 4 → 20 mA DIN 43650 Connector - - 12 → 36 V dc - Nickel Plated Brass
RS Stock No. 739-6777
Mfr. Part No.PBT-RB010SG1SSNAMA0Z
BrandSick
HK$1,206.81
Each
units
Gauge 0bar 10bar ±0.5 % Analogue Fluid, Gas G1/4 4 → 20 mA M12 Connector 4 ms 25 mA 8 → 30 V dc - Stainless Steel
RS Stock No. 613-7732
Mfr. Part No.404366/000-451-405-504-20-61/000
BrandJumo
HK$1,910.00
Each
units
Relative 0bar 0.25bar - - Fluid, Gas G1/2 4 → 20 mA DIN 43650 Connector - - 10 → 30 V dc - Stainless Steel
RS Stock No. 317-948
Mfr. Part No.6761-0013
BrandHerga
HK$82.14
Each
units
Differential - 0.9psi - - - - - Spade Terminal - - 250 V ac - PET
RS Stock No. 774-4104
Mfr. Part No.SDP610-500Pa
BrandSensirion
HK$277.87
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. 739-6771
Mfr. Part No.PBT-RB025SG1SSNAMA0Z
BrandSick
HK$1,206.81
Each
units
Gauge 0bar 25bar ±0.5 % Analogue Fluid, Gas G1/4 4 → 20 mA M12 Connector 4 ms 25 mA 8 → 30 V dc - Stainless Steel
RS Stock No. 398-7051
Mfr. Part No.0166411031043
BrandSuco
HK$225.50
Each
units
- 10bar 20bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine G1/4 - Spade Terminal - - 42 V - Zinc Plated Steel
RS Stock No. 746-3515
Mfr. Part No.A5074-TB-A1-CA-H1-PA 250 mbar G
BrandDruck
HK$4,224.83
Each
units
Gauge - 250mbar ±0.2 % Analogue Fluid G1/4 0 → 5 V DIN 43650 Type A 10 ms 3 mA 7 → 16 V - Stainless Steel
RS Stock No. 313-5351
Mfr. Part No.14X1HA1GV1
BrandVega
HK$2,126.99
Each
units
Gauge 0bar 25bar 0.3 % - Fluid, Gas, Vapour G1/2 4 → 20 mA DIN 43650 Connector - - 12 → 36 V dc - Nickel Plated Brass
RS Stock No. 398-6985
Mfr. Part No.0184457031003
BrandSuco
HK$559.86
Each
units
- 0.3bar 1.5bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine G1/4 - DIN 46350 Connector - 4 A 250 V - Zinc Plated Steel
RS Stock No. 374-8890
Mfr. Part No.787269
BrandBurkert
HK$1,115.39
Each
units
Differential 1bar 10bar - Relay Air, Hydraulic Fluid, Oil Emulsion, Water G1/4 - Spade Terminal - - - - -
RS Stock No. 828-5710
BrandRS PRO
HK$1,369.45
Each
units
Gauge 0mbar 100mbar <±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. 374-8777
Mfr. Part No.787264
BrandBurkert
HK$356.98
Each
units
Differential 50bar 200bar - Relay Air, Hydraulic Fluid, Oil Emulsion, Water G1/4 - Spade Terminal - - - - -
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