How to calibrate the pressure Transmitters

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why I need valve guard and whats different between guard and positioner ??

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what is the minimum power (P=VI)to produce a spark?

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How is flow measured in square root?

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whats the diff b/w zero pressure and obsolute pressure

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Pls.could any one Clarify the following with an example. 1.At What condition Close on Rise and Close on Fall Pressure Switch contacts are used. 2.If Pressure is abnormal as per set pressure,if connecting Terminal of pressure switch breaks,how the voltage extends to Relay base. 3.Are these contacts come under fail safe philasaphy.

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What is Modbus communication

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what are the levels of automation?

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how to check the leak in thermowells

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all questions related to instrument technician in any offshore oil and gas company.

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i hav applied for the post of engg. in iocl so please require the past test papers fro instrumentation engg please please help me and send me the papers or tell me the pattern and type of ques asked in examination......

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The DCS stand for________________________. it is composed of the following major components: a:______________ b:______________ c:______________ d:______________

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