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how can we caliberate interface
level troll
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Answer Posted / jayesh manani
Level troll calibration
0% Zero 100% Span
Liquid Level Displacer out of liquid Displacer in liquid
Interface Level Displacer in lighter liquid Displacer in heavier liquid
Wet Calibration with Water For Liquid level
Zero :
Hang displacer on torque tube arm rod.
Adjust Zero to 3 psi .
Span :
Fill up water into the chamber.
Adjust Span to 15 psi .
0%, 25%, 50% , 75% & 100%. Mark on chamber.
Fill up & Drain water to check 0%, 25%, 50% , 75% & 100%.Check output.
Check function two three times.
Note: Compensate specific gravity difference of water & process liquid.
Process liquid specific gravity is 0.7
Water specific gravity is 1.0
To calibrate level transmitter 100% level.
Water level to be fill up in chamber = 0.7/1.0 x 100 %
= 70 %
Dry Calibration with Weights
Find out Displacer
W = Displacer weight in 2400Gram (2.4 kg)
Specific gravity of process liquid. (WATER)= 1.0
V = Volume of displacer. 1620.84
Displacer diameter 7.620 Centimeter (3 inch).
Length of Displacer 35.56 centimeter (14 inch)
Volume= 3.14 X r² X h
= 3.14 X 3.81 X 3.81 X 35.56
= 1620.84
Zero :
For 0% Hang displacer or 2400 gram weight on torque tube arm rod .
Adjust Zero to 3 psi .
Span :
For 100% Hang weight= Displacer weight – Volume X Specific gravity
= 2400 – 1620 X 1
= 780.
Adjust Span to 15 psi .
Check function two three times for calibration.
Level
%
Hang weight
(Gram)
Transmitter O/P
(PSI)
0 2400 3
25 1995 6
50 1590 9
75 1185 12
100 780 15
For each 25% step subtract 405 Gram weight from hang weight.1620/4=405.
Note: Compensate specific gravity difference of water & process liquid.
Wet Calibration with Water For Interface level
Zero : Displacer in lighter liquid
Process liquid specific gravity is 0.7
Water specific gravity is 1.0
Mark chamber at 70%
Fill up water in chamber.
To calibrate level transmitter 0% level.
Water level to be fill up in chamber = 0.7/1.0 x 100 %
= 70 %
Adjust Zero to 3 psi .
Span : Displacer in heavier liquid.
Process liquid specific gravity is 1
Fill up 100% water into the chamber.
Adjust Span to 15 psi .
Dry Calibration with Weights
Find out Displacer
W = Displacer weight in 2400Gram (2.4 kg)
Specific gravity of process liquid. Oil= 0.7
V = Volume of displacer. 1620.84
Displacer diameter 7.620 Centimeter (3 inch).
Length of Displacer 35.56 centimeter (14 inch)
Volume= 3.14 X r² X h
= 3.14 X 3.81 X 3.81 X 35.56
= 1620.84
Zero : Displacer in lighter liquid
For 0% Hang weight on torque tube arm rod .
Hang weight= Displacer weight – Volume X Specific gravity
= 2400 – 1620 X 0.7
= 2400 - 1134
= 1266
Adjust Zero to 3 psi .
Span : Displacer in heavier liquid.
For 100% Hang weight= Displacer weight – Volume X Specific gravity
= 2400 – 1620 X 1
= 780
Adjust Span to 15 psi .
Check function two three times for calibration.
Level
%
Hang weight
(Gram)
Transmitter O/P
(PSI)
0 1266 3
25 1145.5 6
50 1023 9
75 901.5 12
100 780 15
For each 25% step subtract 121.5 Gram weight from hang weight.(1620-
1134=486)
486/4=121.5.
| Is This Answer Correct ? | 68 Yes | 8 No |
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