Im working in a shopping center, it is also hotel and office building, two towers exactly and someone is proposing a PLC control for the HVAC system, but Im thinking of a DDC control system. in this case what is the difference between PLC and DDC control?

1 Answers  

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Can we measure pressure using differential pressure transmitter? If yes then how?

5 Answers   Reliance,

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why magnetic flow meter is not used in thermel power plant operation

2 Answers   JK Paper,

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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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Why the Air Tank Accumulators required for the single acting actuators SDV's or BDV's as I see in some Schematic diagrams of ROTORK ??

2 Answers   L&T, Siemens,

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Describe the typical instrumentation used in monitoring the performance of a shell and tube heat exchanger.

0 Answers  

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please can anyone tell me in detail, what's mean by open loop and close loop?

6 Answers  

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wat are the interview questions asked in air india for post service engineer

1 Answers   AirIndia, Shree Renuka Sugars,

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Can any body help to get Rsemulator 5000 free from internet if possible then give me any link or any help .

0 Answers   Engro,

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What is the main difference between the terms instrumentation and Automation?

5 Answers  

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How much voltage we get between two wire of 4 to 20 ma output? Is this voltage up or down respectvice to 4 - 20 ma ?

9 Answers  

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How to calibrate the flow transmitter

0 Answers  

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