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A DP Endress and Hauser flow transmitter is always tripping
pump at low flow. set point is 74 cubic meter/hr. Thorough
impulse line flushing and zero calibration has been done,
yet problem persists. What do you think is the problem and
how do you rectify this fault?
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Answer Posted / ntia
Check the strainer of your pump..remember that your pump supplies the pressure...if the pump strainer is dirty...it will be be giving low flow and since your dp was set to shutoff the pump at a low flow..then your dp will continue to shut off the pump until the pump is cleaned and the fault is rectified.
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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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