Piezoresistive Sensor

8/2/2019 Piezoresistive Sensor

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Piezoresistive sensorFor protective purposes, the piezoresistive sensor is flushed with a hydraulic fluid. The medium

is separated by means of a stainless steel diaphragm. Flexure of the diaphragm as the result of theexternal pressure causes a change in the hydraulic pressure of the fluid around the piezoresistive

sensor. The sensor emits a pressureproportional signal which is converted to a 4 - 20 mA outputsignal.


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The measuring method is very wellsuited for the detection of low pressures and high overloadfactors can be achieved with it.

Principle of piezoresistive sensor

http://www.maxim-ic.com/app-notes/index.mvp/id/683

http://wiki.xtronics.com/index.php/Pressure_Transducer_Primer

http://www.maxim-ic.com/app-notes/index.mvp/id/762

http://pubs.usgs.gov/twri/twri8a3/

http://factory-automation.blogspot.com/2011/07/ceramic-pressure-sensor-offers-multiple.html

http://www.amsys.info/products/me501_505.htm

http://factory-automation.blogspot.com/2011/07/ceramic-pressure-sensor-offers-multiple.html

Cerramic Pressure sensor ICs


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http://www.processonline.com.au/articles/37327-Ceramic-sensors-perform-well-in-tough-applications-

ME662 PCB Mountable ceramic pressuresensor 2-400 bar

http://www.impress-sensors.co.uk/me662-

pcb-mountable-ceramic-pressure-sensor.htm

.5 bar-600

barME

501

/505

ME50615mm Ceramic Pressure Sensor

Pressure ranges are from 1 bar through to 20 bar.


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DSK 701C Ceramic Capacitive Pressure

Sensor

Minimum pressure range

:60mbar

Maximum pressure range: 20 Bar

DSP 411K18mm Silicon Pressure Sensor,

Stainless Steel Diaphragm

Minimum pressure range: 350mbar

Maximum pressure range

:70 Bar

DSP 410Z18mm Stainless Steel Silicon

Pressure Sensor with integrated electronics

Minimum pressure range: 100mbar

Maximum pressure range: 7 Bar

All About Ceramic Pressure Sensors


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Ceramic pressure sensors typically use thick-film technology to create a low cost, stable, androbust media-compatible pressure sensor. These sensors are an excellent alternative to more

expensive stainless steel pressure sensors or oil-filled sensors using silicon piezoresistive sensingelements for any application where an o-ring can be used.

Why?C

eramic pressure sensors are capable for use in nearly all types of harsh media and highpressures. They can be easily packaged to meet your own housing requirements, and manyconfigurations are available including unamplified or signal-conditioned, various calibration

ranges. Low cost, single piece (monolithic) sensors come as gauge only. A smooth membrane iswelded to the base to allow for absolute and sealed gauge snesors when that configuration may

be required. Also available are ceramic capacitive sensors which have the abilility to measurelow pressures such as 60 mbar but can tolerate high overpressures. For example, the ME550 can

tolerate an overpressure of 2 bar. This advantage offers designers new possibilities for pressuremeasurement.

As we previously said, using a ceramic pressure sensor requires the use of an o-ring which is

straightforward and inexpensive. Standard models have 96% ceramic composition which takescare of many types of harsh media. For certain types of media, 99% ceramic composition can

also be requested. For the ultimate protection, saphire composition is also available. However,since it is expensive, it is important to understand the nature of your media.

Ceramic pressure sensors can be used in all types of applications including

y Gasoline measurementy Hydraulic and brake fluidy Wafer processingy High pressure pneumatic controly Level measurementy Medical applications and much more

Packaging these sensors can be customized for your applicationor through use of standard housing which is also available. See the image here which showsstandard housing. The sensor can be easily embedded in vales and pumps, opening the

possibilities for better control in your application.

Check out our ceramic pressure sensors


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http://blog.servoflo.com/bid/73230/All-

About-Ceramic-Pressure-Sensors

Flush Mount Ceramic & Ceramic Capacitive

Pressure Transducers

The thick film technology not only offers proven long term stability and high quality, but alsofavorable prices. The transducers ME501/ME505 are available in standard version for pressure

range 1...50 bar and >100...400 bar either as absolute pressure or relative pressure transducers

(sealed gage is available also). A low pressure version in the range of0.3 to

1bar is availablewith the ME509 series.

Ceramic Pressure Sensor ME506

Ceramic sensor ME506 with flush mounted membranes. Pressure range: 1...20bar


Ceramic sensor ME509 with flush mounted membranes. Pressure range: 0...200 /

0...500 mbar

Ceramic Pressure Sensor ME501/505

Ceramic sensor ME501/505 with flush mounted membranes. Pressure range:1...500 bar


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Ceramic capacitive sensor ME550 with flush mounted membranes. Pressurerange: 0...60 / 0...20,000 mbar. High overpressure

Ceramic Pressure Sensor ME77X Series

Ceramic gauge, sealed gauge or absolute sensorME77X in 2 piece design.

Pressure range:0.5...600 bar, temperature-compensated with ratiometric 0-4.5V, or non-

ratiometric 0-10V or 4-20mA.

Ceramic Pressure Transducer ME780 Series

Ceramic gauge, sealed gauge or absolute sensorME780 with integrated signal

conditioning. Pressure range:0.5...600 bar, temperature-compensated with ratiometric 0-4.5V.

http://www.servoflo.com/pressure-sensors/category/two-part-pressure-

transducers.html

Contact for Pressure sensor imp for sensor

selection

http://www.servoflo.com/pressure-

sensors.html


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3V Supply Pressure Sensors For 3 PSI &

Higher3V supply pressure sensors for low power applications. Gauge, differential & absolute versionswith a calibrated voltage output are available.

X3DM Series

3V supply, surface mount package, differential pressure sensor with calibratedvoltage output for 3 psi and up

X3GM-3/X3GM-6 Series

3V supply, surface mount package, 3 or 6 mm pressure port, gauge pressure withcalibrated voltage output

X3PM/X3AM Series

3V supply, dual in-line and surface mount package, absolute pressure with acalibrated voltage output, for 3 psi and up

X3PM/X3HM Series

3V supply, dual in-line package, gauge, calibrated voltage output for 3 psi & up


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Kilogram per Square Centimeter (kg/cm) orKilogram Force per Square Centimeter(kgf/cm) - is a pressure unit that has been largely superceded by the SI unit system of pascal

units. It is the metric equivalent of pounds per square inch (psi). 1 kg/cm2 equals 98,066.5Pascals.

http://www.sensorsone.co.uk/pressure-

measurement-glossary.html

Transducer - is a device that converts a non-electrical change into an electrical change.

Pressure

Natural gas domestic installations are normally supplied at the outlet of the meter with a

prescribed pressure of 1.25 kPa. The gas installation piping is normally sized to ensure that a

pressure of 1 kPa is available to each appliance connected to the installation. This ensures that allappliances operate safely and perform adequately.

Where high pressures are available in the reticulation system, Natural Gas domestic customerscan be supplied at the outlet of the meter with a pressure of 2.75 kPa. This higher pressure allows

the installation piping to be reduced in size as a greater pressure drop can be allowed across the

installation.

LP Gas installations normally operate at a pressure of 2.75 kPa. This pressure is set at the gas

pressure regulator adjacent to the cylinder or tank. The installation piping is usually sized toensure a pressure of 2.75 kPa is available at the appliances.


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Gas Pressures

Natural gas originates in the north sea at a well head pressure of 100 bar. After

pressure reduction at pumping rigs this is reduced to 70 bar at shore terminals.

The mains pressure in the local distributing system may be from 30mbar to 7

bar.

The gas systems are classified as follows:

Low pressure - up to 75mbar

Medium pressure - 75mbar to 2 bar

Intermediate pressure - 2 bar to 7 bar

High pressure - above 7 bar

The services pipe pressure to a consumers premises is about 30mbar to

50mbar.

This is reduced to a working pressure of21mbar by a regulator at the inlet to

the meter.

Gas Governors

Natural gas is subjected to fluctuations in pressure and the governor limits thegas pressure and flow rate. A safe minimum gas pressure in the mains is

required by statute, this is 12.5 mbar.

To ensure that each appliance is supplied with gas at the pressure for which it

was designed, it is necessary to control the pressure within limits, this is done by

the governor.


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A service governor is fitted on a gas service pipe, upstream of the meter. A

meter governor is fitted downstream of the meter.

Internal installation pipework starts after the meter.

Most domestic meters are supplied with meter governors connected to the meter

gas inlet. A filteris incorporated into the meter governor to rid the gas flow of

impurities.

Inside the governor a spring loaded diaphragm regulates flow and pressure. The

diaphragm will work in any position since it is spring loaded

http://www.arca53.dsl.pipex.com/index_files/

gas3.htm

complete Gas System

http://www.arca53.dsl.pipex.com/index_files/

gas1.htm


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Piezoresistive Sensor