Answer / omak

RTD: Resistance Temperature Detector,
Principle: Every metal has its own different characteristics. wen a metal undergoes heat then its electrical or mechanical characteristics will change proportionally.
In case of RTD, wen it undergoes heat then its electrical characteristcs will change proportionally.By measuring the resistance,we can find out actual temperature.

Thermocouple: thermocouple is working on the principle of Seeback effect. two dissimillar metals are combined together and forms two junctions(Hot and Cold). wen applying a heat on the one junction there is an output as milli volt. by measuring the milli volt, we can calculate the temperature with known reference temperature(cold Junction).

components of control circuit belongs to control valve

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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?

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