CALIBRATION OF DP LEVEL TRANSMITTER (SUPPRESSION) :

Updated: Apr 9

In this article, we will we discussing Calibration of the DP transmitter when the transmitter installed below 0% level.


(1) DRY LEG


Let, consider the above-stated example in which we have a height from the centre to centre tapping is 8360 mm and the height from 0% to HP connection is 310mm.


1. Calculate Range


Range = centre to centre (0% to 100%) * S.G.

= 8360 * 1.21

Range = 10115.6 mmH20


2. Calculate LRV


LRV = HP -LP

= (1.21 * 310) - 0

LRV = 375.1 mmH20


3. Calculate URV


URV = LRV + Range

= 375.1 + 10115.6

URV = 10490.7 mmH2o


(2) WET LEG


Now let take same above example with this time for wet leg having a specific gravity of 1.25


1. Calculate Range


Range = centre to centre (0% to 100%) * S.G.

= 8360 * 1.21

Range = 10115.6 mmH2o


2. Calculate LRV


LRV = HP - LP

= (310 * 1.21) - (8880 * 1.25)

(Due to wet leg add height 310+8360+210 = 8880)

= 375.1 - 11100

LRV = -10724.9 mmH2o


3. Calculate URV


URV = LRV + Range

= -10724.9 + 10115.6

URV = -609.3 mmH2o


After calculation of LRV and URV put this value in the transmitter.

CALIBRATION

CONTROL VALVE

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