Answer / mathan

proportional -it is the present error and it can be adjusted by gain.
integration - past error and can be adjusted by resetting functions
derivatives - future error and can be calculated by rate of change of time

Answer / carl_ellis

PID provides a modulated output response to an error signal,
where error is the difference between what you want, the
setpoint, and what you have, the process variable.

PID uses an output response proportional to the input span
(P = proportional), modified by the accumulated error over
time (I = integral) and modified by the rate-of-change of
the error (D=derivative).

Carl Ellis
Measure First

Flow tax range 0 to 100 mmh2o ,flow rate 40 tons /hr, I want change flow rate example 42 tons/hr so tx range ?

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How DP Transmitter can be calibrated for crud application in floating roof tank?

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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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How can SmartPlant Instrumentation users take advantage of these global services?

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Instrument QA/Qc what is the project quality plan?conduit inspection RFI. which documents attache with package?

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