1. What means HART communicator / where it is used / how to use it? 2. Types of Thermocouples and its temperature ranges / output of thermocouple? 3. Types of RTDs and its temperature ranges / output of RTD? 4. Idea about Temperature Transmitters? 5. Difference between Analog and Digital signals? 6. Difference between “2 wire” and “4 wire” system / instruments? 7. Difference between “Potential” and “Potential free” contact? 8. Types of flow meters / transmitters? 9. Types of level transmitters? 10. Difference between “Power/Control” cable and “Instrument” cable? 11. What means “shield” and “screen” in cables / how it is useful? 12. Draw a schematic of closed loop circuit of flow / level / pressure / temperature? 13. Idea about calibration of Control valve / positioned / I/P? 14. How to bypass a digital/analog signal in PLC/DCS by hardwire and software?

6 Answers   JSL,

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why we set -10 volt in vibration sensor output,why not +10 volt

3 Answers   Sabic, TVS,

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use of split range ? where it is used ? in which control loop it is used ?

0 Answers  

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why we are using digital signals for I/O & how to measure this signals is getting or not ?

0 Answers  

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How can one improve linearity of an RTD based temperature measurement system?

2 Answers   Honeywell,

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What is the principle of a Pressure gauge?

2 Answers   CCIE,

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Dead weight tester & comparator for calibration , which is more accurate , what is the application.

1 Answers   Bapco Bahrain Petroleum Company,

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what is the basic working principle of I/P and Positioner in any control valve.

12 Answers   Essar, Visa Steel,

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what is the difference between active and passive loop ?

8 Answers  

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If the Barrier Fails during online then What will be the control valve position in field or Positioner action in the field.

3 Answers  

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How does the "as-built" function benefit plant owner/operators?

2 Answers  

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flow transmitter formula?

0 Answers   BEMCO, Siemens, Yokogawa,

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