Why Instrumentation Air Compressor called as
Instrumentation Air compressor?pls dont just tell its
trasferring IA to all transmitter,valves.I need exact
reason, please......................
Answer Posted / va
As instruments need clean air supply which should be mixed
with moisture and oil from compressor. For that purpose the
air dyer is used which heat,cool and filter compressed air,
which remove the all above. So it specially used for
instrumentation purpose. So it is called INSTRUMENTATION
AIR COMRESSOR
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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 =