Level Calibration Using The Top Of Ball Valve - Honeywell 854 ATG Series Instruction Manual

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
W2= Protection level 2
CA Calibrate
UN Unlock
RL= Reference level
AR Accept reference
EX Exit
CA Calibrate
UN Unlock
For verification of the level calibration, refer to section 4.8.2.
Page 24
Description
Enter protection level 2 password
The displacer will be raised until it stops against the flange of the level
gauge.
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.
Make sure the displacer is positioned above the ball valve.
►
Close the ball valve.
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).
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.
By giving this command, the level value entered in item RL, is
accepted as level value and will be shown on the display.
Exit protection level.
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.
►
Unlock the gauge. The displacer will now move down till it reaches the
level.
Commissioning
Caution