Operation
P
age 34
4.9 Verify level calibration
4.9.1 Verify level calibration against a tank top reference stop
When a tank adapter with a tank top reference stop is installed, the level calibration of the 854 ATG can be
checked. Proceed as follows:
Item Name Description
CA Calibrate With this command the displacer is pulled up until it is halted
against the tank top reference. Wait until the displacer is settled.
TT Tank top Request for the tank top value, which was established during level
calibration. The level reading from the gauge should not differ more
than ±3 mm (±
1
/
8
") with the value in item T
T.
UN Unlock Give an unlock command to cancel the calibrate command.
If the tank top value and the gauge reading differs more than the specified value, the calibration procedure as
described in section 3.4.2 should be repeated.
4.9.2 Verify level calibration on top of ball valve
If the top of the ball valve is used as reference point, the level calibration of the 854 ATG can be verified.
Proceed as follows:
Item Name Description
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.
Close the ball valve.
UN Unlock Unlock the gauge and wait the displacer reaches the top of the ball
valve.
RL Reference level Request for the reference level value, which was established during
calibration. The level reading from the gauge should not differ more
than ±2 mm (±
1
/
16
") with the value in item RL.
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.
UN Unlock Give an unlock command to cancel the calibrate command.
If the reference level value and the gauge reading differs more than the specified value, the calibration
procedure as described in section 3.4.3 should be repeated.
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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