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how is a displacer type level transmitter calibrated.explain the method?
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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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