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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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Answer Posted / manish kumar singh
Ans.2- Type
Symbol Materials Temperature limits(°C)
S Pt10%Rh-Pt -50 / 1760
R Pt13%Rh-Pt -50 / 1760
B Pt30%Rh-Pt6%Rh 0 / 1820
E Cr - Co -270 / 1000
J Fe - Co -210 / 1200
K Cr - Al -270 / 1370
T Cu - Co -270 / 400
N Nicrosil-Nisil -270 / 400 (1) 0 /1300 (2)
W3 W3%Re- W25%Re 0 / 2310
W5 W5%Re - W26%Re 0 / 2310
| Is This Answer Correct ? | 9 Yes | 2 No |
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