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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 / bm
Rajesh has answered 1st 6 qtns. The rest answeres are:
7. Potential contact means there will be a voltage in the
contact whereas potential free contact means that there
won't be any voltage in the contact. The user can take any
voltage basd on the contact rating in the pot free contact
to use further for his application i.e driving some
relay/contactor.
8. Types of flow meters: Rotameter, Venturi FM, Wedge FM,
Ultrasonic FM, Turbine FM, Magnetic FM, Vortex FM, Mass FM.
9. Types of LT: Displacer, GWR LT, Capacitance LT, DP LT,
FMCW LT, Ultrasonic LT.
10. Power/control cable has supply voltage of more than 24V
with no current signal, generally used to actuate
electrical contactors/solenoid valves.
Instrument cable is used to carry "mA" signals or potential
free signals.
11. shield / screen are same to avoid the noise in the pair
cables.
12. Not able to draw here.
| Is This Answer Correct ? | 32 Yes | 2 No |
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