Answer Posted / rovel delalamon
loopcheking, field to the control room.from instruments to ijb.formijb to mrashalling cabiet.,,check polarities,check the voltage suplly w/24v dc. chech also the possible leaks of the tube.and warm-up 5mins.prior to calibration.use HART COMMUNICATOR.highway addressable remote transducer.the one who configuer the input and output of the trnsmitter
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the 3 most common transmitter protocol being in refinery or qatar gas and aramco.
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few questions on RS 232,1 question on relationship of impedance and turns ratio, many questions on flowmeters
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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