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how is a displacer type level transmitter calibrated.explain the method?
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Answer Posted / a.moin
A displacer type level is most commonly level application
used for the closed vessel as well as interface level where
the two process liquid having diffrent specific gravity.
Its works on the arthmedics principle or the loaw of
buoncy, the law say the weight of the substance immerse in
the liquid is equal to the amount of liquid displaced by
the body.
Now as per the question the way to calibrate the displacer
level first we have to isolate the level troll chenber from
its process by isolating the root valves,
then drain the liquid presence inthe chamber, connect the
PVC transparent tube at the bottom of the cahmber and then
start filling the water in the tube.
For zeroing
fill up the water into chember and adjust the zero check
this function two or three times....
compensate the S. G of diff liquids Prcoess S.G= 0.7 and
water S.G= 1.0
to calibrate the transmitter for span 0.7/1.0 *100= 70%
fill the water upto 70% adjust the span
For dry calibration of displacer you should knwo these
details below
Displcer weight: 2400 grms (2.4Kg)
volume of Displacer: 1620.84 by ^r2h..
displacer diameter: 7.620 centimeter
length of displacer: 35.56 centimeter
Note: the limitation of displacer cannot be exceed more
than 72 inches....
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