why we should maintain neutral earth voltage below 1V while calibration? why cant it be 1.2V or 2V

0 Answers   Hospira,

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What is the difference between HMI and SCADA and MMI

4 Answers  

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why we are using -24 vdc in plc?

1 Answers   CGL,

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How do we MEASURE OR CALCULATE VELOCITY used to calculate REYNOLDS NUMBER??

3 Answers  

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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?

6 Answers   JSL,

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I want to install analog type, flange mounted gas flow meter (line size - 2"), for CNG flow measurement.Kindly give some details of flowmeter or suppler name, available in India.

1 Answers  

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I have seen the Temperature element (T/C & RTD) installed in process line on 45 degree position, Why? What it mean? How many types of tapping position for temperature elements?

4 Answers  

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Pressure tx shows 1 mbar but we need 1000 mbar at this process condition .. how can we sort it out .

0 Answers  

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WHAT IS A SYMPTOM OF FAULT WITH THE SPAN OF AN INSTRUMENT? 1)ZERO-POINT AND 100% ARE CORRECT BUT NOT A MID-RANGE. 2)ZERO-POINT IS CORRECT ,BUT 1005 INPUT IS NOT GIVING 100% OUTPUT. 3)LINEARITY PRBS. 4)1005 O/p IS CORRECT BUT ZEO POINT IS WRONG.

1 Answers   Reliance,

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who to convert dc to ac

7 Answers   ONGC,

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Specific gravity.

0 Answers   CCIE,

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tell how to calibrate a magnetic flow tx, vortex flow tx,dp flow tx,nozzle flow tx and venturi flow tx?

2 Answers   TATA,

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