What is meant by Fail Safe Condition in PLC?

4 Answers  

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How can we say that accuracy of measurement increases by using 3 or 4 wire RTD? because for example: If resistance of RTD element is say r ohms and Resistance of the cable from transmitter to RTD is R ohms And if 4 wire RTD is used, ____._____________________ R ohms | |_____._____________________ R ohms / \ / r ohms \ \ | |______.__________________ R Ohms | |_______._________________ R ohms Then the actual resistance measured will be: Total = r + R/2 + R/2 = r +R Ohms Note: r+R instead of r ohms. hence error

2 Answers  

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centrifugal compressor interlock? Tell me the parameter at which compressor will trip

0 Answers   Cairn,

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If a flow transmitter (magnetic type FT) that can measure flow and temperature, then why in some industries people use flow transmitter and temperature transmitter in the same line 1 after another? Even after 1 single flow FT is capable of measuring flow as well as temperature.

1 Answers   Process Control Technologies,

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Any body have know try work calculation ???

0 Answers  

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Which of the following instruments consumes maximum power during measurement?

3 Answers  

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How to work ultrasonic flow meter ?

1 Answers  

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What is the use of single seated valve?

0 Answers  

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What are different types of control valves?

0 Answers  

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how to control motor load with rpm or vfd

1 Answers  

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What materials are used in thermo wells?

0 Answers  

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TCD Principle

1 Answers  

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