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Answer Posted / aadi
A level transmitter can be an application of a level sensor.
a Capacitive Transducer can be used, usually, as a level
translator(but it should be noted that a level translator is
actually more of an electronic circuitry term!).
The principle of the level translator is based on the change
in capacitance due to the change in the overlapping area of
the dielectric,i.e.,the change in the level of the element
thats being measured,can be associated with that of the
dielectric in a suitable capacitive transducer setup.
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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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How to Calibrate Level Switch in field
