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IS IT POSSIBLE TO CALIBRATE A LEVEL TRANSMITTER INDICATOR(ABB)
USING HART COMMUNICATOR.? I MEAN TO CHANGE FROM ONE UNIT TO
ANOTHER WITHIN INDICATOR (EG. INCH TO FEET)...? PLZ NOTE
THAT I HAVE MADE THE UNIT CHANGE IN TRANSMITTER USING HART
COMMUNICATOR..BUT WHAT ABOUT THE INDICATOR..?
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Answer Posted / omer baosman
First of all,parameter's which need to be diagnostic in
transmitter with any of communicator will be in percentage .
Like for flow eg: Kgs,temp eg:cc fh level eg: % ,pressure
psi or bar.
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I need control valve ISA hand book. Is there any site to download that big book containing all the pages. Written by Paul Friedmann
Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =
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