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. 448-8038
Mfr. Part No.5000BGA1000M3007A001
$787.15
Each
units
Gauge 351mbar 1000mbar 0.2 % Analogue Water/Diesel/Fuel Oil G1/4 4 → 20 mA Wire Lead 5 ms 20 mA 9 → 35 V dc - Stainless Steel
RS Stock No. 125-1316
Mfr. Part No.PN2571
$887.82
Each
units
Relative 0bar 250bar <±0.4 % Analogue + PNP-NO/NC Programmable Fluid G1/4 0 → 10 V, 4 → 20 mA M12 Connector <1.5 (Minimum Switching Output) ms, <3 (Maximum Analogue Output) ms 250 mA 18 → 30 V dc IO-Link PBT GF20, PBT+PC GF30, PC, Stainless Steel
RS Stock No. 313-5351
Mfr. Part No.14X1HA1GV1
BrandVega
$510.54
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. 169-8093
Mfr. Part No.ADP51B61
BrandPanasonic
$13.545
Each (In a Tube of 100)
units
Gauge - - ±2.5 % Amplified Air - 4 V PCB - 10 mA - - -
RS Stock No. 102-4156
BrandRS PRO
$463.76
Each
units
Gauge 0mbar 500mbar ±0.25 % Analogue Oil BSP 1/4 4 → 20 mA DIN 46350 Connector - 28 mA 9 → 32 V dc - Stainless Steel
RS Stock No. 774-4091
Mfr. Part No.SDP2000-L
BrandSensirion
$125.78
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. 922-7318
Mfr. Part No.MPX2200AP
BrandNXP
$17.538
Each (In a Tray of 20)
units
Absolute 0kPa 200kPa ±1 % - Air - 38.5 → 41.5 mV PCB Mount 1 ms - 10 V dc - Epoxy
RS Stock No. 914-8344
Mfr. Part No.DP101AEP
BrandPanasonic
$214.31
Each
units
Gauge -100kPa 100kPa ±1 % PNP Open Collector Non-Corrosive Gas G1/8 1 → 5 V dc, 100 mA Wire Lead 2.5 ms - 12 → 24 V dc - PBT
RS Stock No. 124-1467
Mfr. Part No.46879447
BrandWIKA
$599.24
Each
units
- 0psi 14.22psi 0.5 % Analogue Liquid - 4 → 20 mA PUR Cable (15 metres) - - 10 → 30 V dc - Stainless Steel
RS Stock No. 169-0629
Mfr. Part No.MPX4250A
BrandNXP
$34.48
Each (In a Tray of 25)
units
Absolute 20kPa 250kPa ±1.5 % Analogue Air - 4.9 V PCB Mount 1 ms - 4.85 → 5.35 V dc - Epoxy
RS Stock No. 125-1300
Mfr. Part No.PN3560
$770.81
Each
units
Relative 0bar 600bar <±0.5 % Analogue + PNP-NO/NC Programmable Fluid G1/4 0 → 10 V, 4 → 20 mA M12 Connector <3 (Maximum Analogue Output) ms, <3 (Minimum Switching Output) ms 150 mA @ +60 °C, 200 mA @ +60 °C, 250 mA @ +40 °C 18 → 30 V dc IO-Link PBT GF20, PBT+PC GF30, PC, Stainless Steel
RS Stock No. 797-4977
BrandRS PRO
$250.55
Each
units
Gauge 0bar 40bar ±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. 922-7368
Mfr. Part No.MPXA4250AC6U
BrandNXP
$21.18
Each (In a Tube of 40)
units
Absolute 20kPa 250kPa ±1.5 % Analogue Air - 4.9 V PCB Mount 1 ms - 4.85 → 5.35 V dc - Epoxy
RS Stock No. 124-1463
Mfr. Part No.46879222
BrandWIKA
$276.63
Each
units
- 0bar 10bar 0.5 % Analogue Gas, Liquid G1/4 4 → 20 mA DIN 175301-803 C < 4 ms - 8 → 30 V dc - Stainless Steel
RS Stock No. 374-8698
Mfr. Part No.787263
BrandBurkert
$60.70
Each
units
Differential 10bar 70bar - Relay Air, Hydraulic Fluid, Oil Emulsion, Water G1/4 - Spade Terminal - - - - -
RS Stock No. 609-7088
Mfr. Part No.XMPE12C2131
$94.60
Each
units
Differential 1.3bar 12bar 3.5 % - Air, Fresh Water, Sea Water G1/4 - PG13.5 Cable Gland - 1.5 A - - Fibreglass
RS Stock No. 313-5317
Mfr. Part No.14X1AA1GV1
BrandVega
$445.84
Each
units
Gauge 0bar 1bar 0.3 % - Fluid, Gas, Vapour G1/2 4 → 20 mA DIN 43650 Connector - - 12 → 36 V dc - Nickel Plated Brass
RS Stock No. 896-8443
Mfr. Part No.3500B0004G01E000
$227.71
Each
units
Gauge - 4bar 0.25 % Current Air, Gas, Water G1/4 4 → 20 mA M12 Connector - - 10 → 30 V dc - Stainless Steel
RS Stock No. 169-8087
Mfr. Part No.ADP51A11
BrandPanasonic
$18.227
Each (In a Tube of 100)
units
Gauge - - ±4 % Amplified Air - 2.4 V PCB - 3 mA 5 V dc - -
RS Stock No. 655-8173
Mfr. Part No.26PCCF A2G
BrandHoneywell
$36.73
Each
units
Gauge 0psi 15psi ±0.5 % Wheatstone Bridge Nitrogen Gas, Oxygen, Water - 100 mV dc PCB 1 ms - 10 V dc - -
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