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Answer Posted / s. kanniyappan
TEMPERATURE TRANSMITTER:
GIVE 24VDC TO THE TRANSMITTER
CONNECT MULTIMETER IN SERIES WITH -VE TO THE TXT
GIVE RESISTANCE INPUT TO THE TRANSMITTER
GIVE LRV VALUE BY ADJUSTING THE DRB
ADJUST ZERO FOR LRV
GIVE URV VALUE BY ADJUSTING THE DRB
ADJUST SPAN FOR URV
GIVE 25%, 50%, 75%, 100% OF URV (RESISTANCE) AND CHECK THE
CORRESPONDING MILLIAMPS OUTPUT
PRESSURE TRANSMITTER:
GIVE 24VDC TO THE TRANSMITTER
CONNECT 250 OHMS IN SERIES WITH -VE TO THE TXT
CONNECT THE HART TO THE TERMINALS OF RESISTANCE
CONNECT THE TRANSMITTER TO THE SOURCE VIA REGULATOR AND MAKE
A T OFF CONNECT TO A MASTER GAUGE
VARY THE PRESSURE BY ADJUSTING THE REGULATOR
MAKE ZERO TRIM FOR ZERO PRESSURE THROUGH HART
ADJUST THE REGULATOR AND CHECK FOR THE LRV VALUE IF NOT
MATCHING ADJUST THE ZERO
DO THE SAME FOR THE URV
GIVE 25%, 50%, 75%, 100% OF URV (PRESSURE) AND CHECK THE
CORRESPONDING MILLIAMPS OUTPUT
DP TYPE TRANSMITTER
LP LINE SHOULD BE LEFT OPEN TO ATMOSPHERE
CONNECT THE HP LINE TO THE SOURCE AND DO THE SAME AS ABOVE
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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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