Answer / pankaj rathi

It is used in level measurement system . When a level transmitter is installed below the static head Pressure Point at a Tank then extra positive pressure will be sensed and that will be corrected by zero suppression kit.
When the level Transmitter is installed above the static Head Pressure Point at a Tank then a Negative Pressure will be sensed and that will be corrected by Zero Elevation KIt.

Answer / deepan

zero elevation-means lrv(4ma) of the measurement is lower than
zero.ex- (-150 to 500 )mmwc

zero suppression -means lrv(4 ma) is greater than zero
ex-(150 to 500)mmwc
its used in level tx instalation

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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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