Commissioning
Instruction manual 854 ATG Page 23
3.4 Level calibration
3.4.1 Standard level calibration
Make sure the displacer is at the liquid surface. Perform a repeatability test to ensure the displacer is on the
product surface (refer to section 4.2).
Determine the product level by manual dipping. It is essential that the level is as stable as possible.
Note:
Make two or three manual dips and compare each reading to ensure the manual dip value is correct.
I
tem Name Description
W2= Protection level 2 Enter the protection level 2 password
RL= Reference level Format according to item LD. Enter in this item the manual level.
AR Accept reference By giving this command, the level value entered in item RL, is
accepted as product level and will be shown on the display.
EX Exit Exit protection level.
3.4.2 Level calibration with a tank top reference stop
A tank top reference stop is a mechanical device that can hold the displacer at a reproducible position when
the displacer is pulled up. This device is placed above the motor limit switch high position. An Honeywell
Enraf tank adapter can be provided with such a facility.
1) Follow the procedure as described in section 3.4.1
2) Determine the tank top position; proceed as follows:
Item Name Description
W2= Protection level 2 Enter the protection level 2 password.
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 Format according to item LD. Read the level value from the display
and program that value in item TT.
EX Exit Exit protection level.
For verification of the level calibration, refer to section 4.8.1.
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