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1)What is the suitable MOC for flow meters working at
temperature between 200 - 250 cen.
2)In which application the mass flow meters are not
advisable
3)Is it advisable to use radiation type or radar type
instrument for non contact application
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Answer Posted / manojkr24
The suitable MOC as well as suitable way is to use orifice
plate as it can with stand with high temperature as well as
high pressure.
The mass flow meter has the limitation that the fluid to be
measured should be clear if any slug flow occurs it will
make the meter output unpredictable.
For the non contact application rdiation type or radar type
instrument are advisable as they are not in contact with
the material so there is no need take the shut down of the
system to inspect/change the transmitter.
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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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