Answer / koolfire

P,PID controller'S are used to tune the output to a desired value.
however for proportional controllers it always has a steady state error as the output will never reach the desired value but will be close to it.

For  a PID controller due to its integral and derivative action(rate of change of error), it cancels out the steady state error.

What is difference between reset and initialization in system.

1 Answers   Marafiq,

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How oil line flow measured?eplain about instruments used and working principle?

0 Answers  

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(1) In turbine, what does term CDP, NI, NH, HSSOC, means. (2) What is the purpose of LO overhead tank in turbines.(3) An equipment is certified for EEX, IA, IIC,T6, what do you under stand by this.(4) what is SURGE, and how it is prevented, what is the purpose of bypass valve across AS valve.(5) Give 2 application of quartz crystal used for process parameter measurement.(6) what is meant by cold float of compressor shaft. (7) state four different types of flow measurement. For gas flow measurement mmscfd is the common unit. Expand the unit and specify significance of word S in the unit.(8) what is meant by Gap voltage, in vibration measurement. Normally how much Gap voltage is set and state the reason.(9) what will the new flow factor if D/P transmitter is Re-Ranged from 25” wc to 50” wc.(10) what is the usage of QDV & Volume booster.

0 Answers   ADMA OPCO,

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Possible cause of IOP alarm in a DP transmitter: a: IOP-minimum b: IOP-Maximum

4 Answers  

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applications of 1-5v and 4-20ma?

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What is the working principle of the magnetic meter?

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I installed the smartplant instrument v8, but can not be opened, that always said: "INTools 2007 hardlock no found". So Could you help me how to do for that?

0 Answers   SRAAC,

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what is metal of piston ring

0 Answers   MahaGenco,

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I WANT TO KNOW SOME BASIC CONCEPTS RELATED TO INSTRUMENTATION

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In Increasing temperature why thermocouple used and RTD is not used. Both RTD and Thermocouple have in Range of uses.

5 Answers   L&T,

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The performance of a pump is monitored by measuring the ________ and _________ pressures

1 Answers  

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What is sensitivity in vibration probes..?

0 Answers   Lanco,

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