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. 317-443
Mfr. Part No.6753-0002
BrandHerga
$74.84
Each
units
- - 0.072psi ±2.5 % - Air - - Spade Terminal - - - 250 V ac -
RS Stock No. 361-3457
Mfr. Part No.XMLA020A2S12
$380.02
Each
units
Differential 1bar 20bar 2 % Relay Air, Fresh Water, Hydraulic Fluid, Sea Water G1/4 - M20 Cable Gland - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc -
RS Stock No. 835-3933
Mfr. Part No.PU5415
$213.79
Each
units
Relative 0bar 6bar ±0.5 % Analogue Gas, Liquid G1/4 0 → 10 V M12 Connector - 1 ms - 16 → 36 V dc -
RS Stock No. 609-7094
Mfr. Part No.XMPE12C2242
$120.27
Each
units
Differential 1.3bar 12bar 3.5 % - Air, Fresh Water, Sea Water G3/8 - PG13.5 Cable Gland - - 1.5 A - -
RS Stock No. 795-4733
Mfr. Part No.3100R0400S01B000
$206.65
Each
units
Relative 0bar 400bar ±0.25 % Voltage Fluid, Gas G1/4 0 → 5 V DIN 43650 Type A - 1 ms 4.5 mA 7 → 30 V dc -
RS Stock No. 828-5690
BrandRS PRO
$533.06
Each
units
Absolute 0bar 500mbar <±0.5 % Current Oil, Water G1/4 4 → 20 mA DIN 43650 Type A - - 28 mA 9 → 32 V dc -
RS Stock No. 797-5043
BrandRS PRO
$319.72
Each
units
Relative 0bar 1bar ±0.25 % Voltage Air, Gas, Hydraulic Fluid, Liquid, Water G1/4 0 → 5 V DIN 43650 Type C - - - 9 → 32 V dc -
RS Stock No. 302-5844
Mfr. Part No.XMLA020A2S11
$268.82
Each
units
Differential 1bar 20bar 2 % Relay Air, Fresh Water, Hydraulic Fluid, Sea Water G1/4 - PG13.5 Cable Gland - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc -
RS Stock No. 124-2153
Mfr. Part No.XMLR010G0T26
$625.90
Each
units
- 0bar 10bar ≤1 % Analogue Air, Fresh Water, Hydraulic Oil, Refrigeration Fluid NPT 1/4 4 → 20 mA M12 Male 4-Pin Connector - ≤10 ms ≤50 mA 24 V dc -
RS Stock No. 797-5018
BrandRS PRO
$339.14
Each
units
Relative 0bar 10bar ±0.25 % Current Air, Gas, Hydraulic Fluid, Liquid, Water G1/4 4 → 20 mA DIN 43650 Type C - - 20 mA 9 → 32 V dc -
RS Stock No. 235-5891
Mfr. Part No.24PCGFM6G
BrandHoneywell
$63.81
Each
units
Gauge 0psi 250psi 0.2 % Unamplified Nitrogen Gas, Oxygen, Water - 145 → 280 mV Solder Tag - 1 ms - 10 V dc -
RS Stock No. 835-3894
Mfr. Part No.PT5404
$230.23
Each
units
Relative 0bar 10bar ±0.5 % Analogue Gas, Liquid G1/4 4 → 20 mA M12 Connector - 1 ms - 8.5 → 36 V dc -
RS Stock No. 746-3515
Mfr. Part No.A5074-TB-A1-CA-H1-PA 250 mbar G
BrandDruck
$584.77
Each
units
Relative - 0.25bar ±0.2 % Analogue Fluid G1/4 0 → 5 V DIN 43650 Type A - 10 ms 3 mA 7 → 16 V -
RS Stock No. 914-8369
Mfr. Part No.DP101EP
BrandPanasonic
$180.54
Each
units
Gauge -1bar 10bar ±1 % Relay Non-Corrosive Gas G1/8 100 mA Wire Lead - 2.5 ms - 12 → 24 V dc -
RS Stock No. 124-2166
Mfr. Part No.XMPA06B2141C205
$74.89
Each
units
Differential 0.2 (Falling) bar, 1 (Rising) bar 6bar <3.5 (Repeat) % 2NC Air, Fresh Water, Sea Water G1/4 - Screw Clamp - - - - -
RS Stock No. 124-1463
Mfr. Part No.46879222
BrandWIKA
$231.10
Each
units
- 0bar 10bar 0.5 % Analogue Gas, Liquid G1/4 4 → 20 mA DIN 175301-803 C - < 4 ms - 8 → 30 V dc -
RS Stock No. 395-7101
Mfr. Part No.2600BGA1019M3HA017
$956.13
Each
units
Relative 0bar 0.5bar 0.25 % Amplified - - 4 → 20 mA Wire Lead - 0.5 ms 20 mA 7 → 35 V dc -
RS Stock No. 123-5252
BrandRS PRO
$297.02
Each
units
- - - ±0.25 % Analogue - - 0 → 5 V, 4 → 20 mA Screw Terminals - - 5 A 12 → 32 V dc -
RS Stock No. 169-0724
Mfr. Part No.MPXV2202DPT1
BrandNXP
$14.80
Each (On a Reel of 100)
units
Differential 0bar 200kPa ±1 % Voltage Air - 38.5 → 41.5 mV PCB Mount - 1 ms 6 mA 16 V dc -
RS Stock No. 797-5011
BrandRS PRO
$362.38
Each
units
Relative 0bar 6bar ±0.25 % Current Air, Gas, Hydraulic Fluid, Liquid, Water G1/4 4 → 20 mA DIN 43650 Type C - - 20 mA 9 → 32 V dc -
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