Answer / iyyappan.m

Open loop is a only one transmitter here is no control of valve or anything.

Closed loop is a Pid loop ,transmitter control the control valvewith operator desired setpoint.

Why ues 250 ohms Resistor during hart type instruments calibration with hart protocol in details ?

5 Answers  

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how to measure low temperature(<100 dec celsisus) with non condact sensor

2 Answers  

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what is the diffrence between mmwc and kg/cm2 for pressure measurment when we are using mmwc and when kg/cm2 and why????? ?? what is the reason

19 Answers   Ecoboard, Jindal, Sepco,

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if we have 380 KVA DG. how to calculate Power Factor. With detailed formula

1 Answers  

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What is the purpose of RS Networks

2 Answers  

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Tell me about PID Tuning and what is PID.

4 Answers  

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Why only negative 24 vdc supply give in vibration measuring system.

6 Answers  

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WHAT IS MEANT BY SUPERVISORY CONTROL?

3 Answers  

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how the 4 to 20 mA signal goes to any controller/indicator,and what is the role of voltage ,12/24 and how to do connection of it, in controller.

1 Answers  

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Witch type cable use for rtd ,why?

2 Answers   Sugar Factory,

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In s7-200 we use HMI TD-200C , what that C stands for........ plz reply

2 Answers  

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Decibel.

0 Answers   CCIE,

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