Answer / vaibhav v t

ATEX means Atmosphere Explosives.ATEX is europiean body for
issuing certification to instruments for thier use in
hazardous area/application.ATEX has specific marking on
instruments which mentions class, div, temp class,gas class.

Instrinsic safe means it is one type achiving safety for
usisng instruments in hazardous application.Electronics in
instruments is designed in a such way that energy generated
during spark inside is such low so tat it will not ignite
explosive gas-air mixture.All componenets are low power
feed.

how many type of plug are used in pneumatic control valve,name them.

2 Answers   Godrej,

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Why any transmitter signal is 4-20 mA only Why is started from lower range 4 mA and upper range is 20mA.

5 Answers   Edac,

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What is voltage free(wet) and potential (dry) contact?

2 Answers  

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How to measure the vibration..?

1 Answers   Madhucon,

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canu tell me why 4-20 ma and why not this 3-25ma?please give reason of this value.

6 Answers  

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what is gas metering system? gas chromatograph? and gas compressors?

0 Answers   HPCL,

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Why we use the double acting control valve in flow line?

3 Answers  

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For crude application in floating roof tank, how to calibrate a DP Transmitter? How is the floating roof weight considered?

0 Answers  

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what is difference between pressure,flow and level control valve.

3 Answers  

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why we are using 4-20ma why cant we use 4-40ma

3 Answers  

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model question paper of instrumentation for Jindal GET 2010.plz reply sudhanshukumar08@yahoo.com

0 Answers   Jindal,

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Why we use 4 to 20 mA, (This is International Standard) instaed of this can we use 4-16, or 4-24 or 3- 15 or any other range

13 Answers   ONGC,

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