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 Calibrated Process Connection Analogue Output Electrical Connection Communication Protocol Response Time Maximum Current Supply Voltage
RS Stock No. 169-0627
Mfr. Part No.MPX2202A
BrandNXP
£9.93
Each (In a Tray of 25)
Units
Absolute 0bar 200kPa ±1 % - Air - - 38.5 → 41.5 mV PCB Mount - 1 ms - 10 V dc
RS Stock No. 124-2124
Mfr. Part No.9013FHG2J27
BrandSquare D
£27.10
Each
Units
Differential 40 (Rising)psi 100 (Rising)psi ±3 (Repeat) % 2NC Air - 0.25 in NPSF - Screw Clamp - - - -
RS Stock No. 123-6131
Mfr. Part No.251858
£50.00
Each
Units
- 0.7bar 4.1bar ±0.1 bar SPST-NO Gas, Liquid - BSP 1/4 - 1/4 x 1/32 Spade Terminal - - - -
RS Stock No. 317-948
Mfr. Part No.6761-0013
BrandHerga
£8.31
Each
Units
Differential - 0.9psi - - - - - - Spade Terminal - - - 250 V ac
RS Stock No. 835-2839
Mfr. Part No.XMLR010G1N25
£304.00
Each
Units
Differential 0bar 10bar ≤0.1 % 1 x NPN, Analogue Air, Fresh Water, Hydraulic Oil, Refrigerator Fluid - G1/4 4 → 20 mA M12 Connector - ≤10 (Analogue) ms, ≤5 (Discrete) ms ≤50 mA 24 V dc
RS Stock No. 448-8094
Mfr. Part No.0184457031-SS
BrandSuco
£73.93
Each
Units
- 0.5bar 5bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine - G1/4 - DIN 43650 Type A - - 4 A 250 V
RS Stock No. 169-7636
Mfr. Part No.164PC01D76
BrandHoneywell
£390.654
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. 395-235
Mfr. Part No.164PC01D76
BrandHoneywell
£524.52
Each
Units
Differential 0in wg 5in wg ±2 % Amplified Gas - - 1 → 6 V Solder Tag - 1 ms 20 mA 6 → 16 V dc
RS Stock No. 455-4680
Mfr. Part No.3100B0250S01B000
£96.50
Each
Units
Gauge 0bar 250bar 0.25 % Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil - G1/4 4 → 20 mA DIN 43650 Type C - 1 ms - 8 → 30 V dc
RS Stock No. 123-6662
Mfr. Part No.X5072-TB-A1-CA-H1-PA 4.0 bar G
BrandDruck
£282.00
Each
Units
Gauge - 4bar ±0.2 % Analogue Fluid RSCAL G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 293-8339
Mfr. Part No.40PC015G1A
BrandHoneywell
£123.93
Each
Units
Relative 0psi 15psi ±0.4 % Amplified Gas - - 0.5 → 4.5 V PCB - 1 ms 10 mA 4.75 → 5.25 V dc
RS Stock No. 455-4696
Mfr. Part No.3100B0400S01B000
£96.50
Each
Units
Gauge 0bar 400bar 0.25 % Analogue Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil - G1/4 4 → 20 mA DIN 43650 Type C - 1 ms - 8 → 30 V dc
RS Stock No. 746-3464
Mfr. Part No.X5072-TB-A1-CA-H1-PA 4.0 bar G
BrandDruck
£198.00
Each
Units
Relative - 4bar ±0.2 % Analogue Fluid - G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 124-2163
Mfr. Part No.XMPA06B2131
£33.00
Each
Units
Differential 0.2 (Falling) bar, 1 (Rising) bar 4.8 (Falling) bar, 6 (Rising) bar <3.5 (Repeat) % 2NC Air, Fresh Water, Sea Water - G1/4 - Screw Clamp - - - -
RS Stock No. 111-5920
Mfr. Part No.PX3AN2BS100PAAAX
BrandHoneywell
£33.29
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. 361-3429
Mfr. Part No.XMLA300D2S12
£144.00
Each
Units
Differential 20bar 300bar 2 % Relay Hydraulic Fluid - G1/4 - M20 Cable Gland - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc
RS Stock No. 535-1195
Mfr. Part No.526610CLBHTI
£138.00
Each
Units
Differential -1000Pa 1000Pa ±1 % Analogue Air, Non-Conductive Gas - - 4 → 20 mA Terminal Strip - 1 s - 24 V dc
RS Stock No. 123-6665
Mfr. Part No.X5072-TB-A1-CA-H1-PA 250, mbar G
BrandDruck
£347.00
Each
Units
Gauge - 250mbar ±0.2 % Analogue Fluid RSCAL G1/4 4 → 20 mA DIN 43650 Type A - 10 ms 20 mA 7 → 28 V
RS Stock No. 609-7088
Mfr. Part No.XMPE12C2131
£43.00
Each
Units
Differential 1.3bar 12bar 3.5 % - Air, Fresh Water, Sea Water - G1/4 - PG13.5 Cable Gland - - 1.5 A -
RS Stock No. 835-3894
Mfr. Part No.PT5404
£99.54
Each
Units
Relative 0bar 10bar ±0.5 % Analogue Gas, Liquid - G1/4 4 → 20 mA M12 Connector - 1 ms - 8.5 → 36 V dc