Answer / chandra mohan

control modes are two types
1. continuous control modes
in that three types are there
I. P-controller
II.I-controller
III.D-controller and combination of these modes
2. discontinuous control modes
in that two types are there
I. two position control modes
II. three position control modes

in valve is constructed as per SME B 16.34, then which standard is used for fire testing of valve?.

0 Answers  

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why use to 250 ohm for hart protocol and why hart communicator not communicate without 250 ohm 

4 Answers   OMV,

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If you SOURCE your outputs from a PLC, would you have to make the output HIGH, or LOW, in order to switch an output ON?

1 Answers  

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How addressable fire systems work? Pl. send details with architect.(Loop), also send details regarding Gas system. Pl. help me.Thanks

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Explain why plc require in analog input 4-20amp & 0-10 volt?

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WHAT IS THE CAM POSITION IN CONTROL VALVE POSITIONER ? WHY IT IS USED?

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what is a instrumentation ?

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Basic working principle of control valves

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Before erect the instrument what should you do?

3 Answers   L&T,

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why we require Differential pressure?Why we use Orifice Plate?

3 Answers  

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why is negative range given to measure the steam drum level

2 Answers   Jindal,

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why 4 to 20 ma? why cant some other range?

3 Answers  

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