What is the role of P(Protional), I(Integral) and D (Derivative) in PID Controller?

9 Answers  

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defination of plc? why we use plc? application of plc? advantage of plc?

4 Answers  

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I have a steam flow DP transmitter that has output swinging. Steam valve is in manual.I have good steam pressure. The impulse lines have steam tracing on them. The steam tracing has a hole in it that is blowing raw steam on the high side impulse line only. Could this be causing the swinging?

1 Answers   Honeywell,

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To find closed tank level by DP transmitter , how to findout its range.and insomeplace they using range like - 1500 to +1500 mmwc why not 0 to 3000 mmwc. how they spilit they range for minus and plus.and why?

1 Answers   Kuwait Oil Company,

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why we use 24 vdc in instruments mostly?

2 Answers  

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Can we use twisted pair cable instead of ethernet for communication?

1 Answers   Yokogawa,

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what is modbus?and why use it?what benifit

2 Answers  

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why use MMWC unit

9 Answers   Praxair, Saipem,

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we have LPG spherical Tank and we want to install DP Xmtr for level measurement.below are the physical measurements Total height of tank is 1850 mtr but 0% level is 1000mm above bottom and 100% level is 450 below upper side.What is the LRV and URV and please mention the formula .The SG of LPG is 0.53 and Wet Leg method will be used.

7 Answers  

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A flange is used for instrument connection for a system with a design temperature of 316C (600F) and a design pressure of 1000 kPa (145 psi). What is the class rating of the flange to be used for this application? Explain your answer

0 Answers  

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what is meant by cold junction compensation. where it is used.

1 Answers   SRACO,

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what is DCS and SCADA?

2 Answers   APL,

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