how is a displacer type level transmitter calibrated.explain the method?
Answer Posted / haridass kwt
To calibrate the displacer type LTs by fixed in the w/bench,
First remove the head, clean displacer and chamber and
assemble,
fix the calibration setup (drain isolation, clear tube and
marked scale),
Calculate 100% position of fluid filling, by the Sp.
gravity of the fluid where the LT being used. (Ex: If sp.gr
is 0.8, then the 80% of the displacer height to be marked
in chamber due to the water used for calibration), and mark
every 25% in chamber ouside for reference.
Fill the water and check the transmitter/board/sensor
response approximately.
Fill the water till the displacer touches. and chk 0% and
adjust to 4mA.
Fill the water till 100% to check span and adjust 20mA.
(If the LT s not responding, replace LVDT/board and chk)
Repeat zero and span check 4-5 times and the chk every 25 %
rising and falling.
If ok, the prepare the calibration report and tag it.
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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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