Commissioning
P
age 24
3.4.3 Level calibration using the top of ball valve
If level dipping is not possible, the 854 ATG can be calibrated using the top of a ball valve as reference point.
Proceed as follows:
Item Name Description
W2= Protection level 2 Enter protection level 2 password
CA Calibrate The displacer will be raised until it stops against the flange of the level
gauge.
► Make sure the displacer is positioned above the ball valve.
C
lose the ball valve.
UN Unlock Unlock the gauge and wait the displacer reaches the top of the ball
valve.
► Calculate the immersion depth of the displacer at the product
interface (for a 90 mm displacer use 3 mm; for a 45 mm
displacer use 12 mm).
RL= Reference level Format according to item LD. Enter the position of the top of the ball
valve with respect to the tank zero adding the immersion depth of the
displacer at the product level.
AR Accept reference By giving this command, the level value entered in item RL, is
accepted as level value and will be shown on the display.
EX Exit Exit protection level.
CA Calibrate The displacer will now raise from the ball valve.
Let it stop against the flange or give a FR (freeze) command.
► Open the ball valve.
U
N Unlock Unlock the gauge. The displacer will now move down till it reaches the
level.
For verification of the level calibration, refer to section 4.8.2.
Caution
If a 45 mm displacer is used, stop immediately the Calibrate command
as soon as the displacer is above the ball valve,
followed by an FR (freeze) command.
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