Maintenance
P
age 44
5.5 Calibrating force transducer
After mounting a new force transducer or another
motor-block the force transducer must be calibrated.
The frequency of the force transducer must be
calibrated with help of a set of accurate test weights
of 25 g, 75 g, 150 g and 225 g, all ±0.1 g.
Check the mounting of the 854 ATG whether it is
stable and horizontal.
Use the following procedure for calibration. It is
assumed that the 854 ATG is fully operational.
Calibration of an incompletely checked and
reprogrammed gauge is not advisable.
If there is no inspection hatch, try to mount the gauge
sideways, next to the original 2" flange. Figure 5.6 Set of test weights (#S1854061)
Check the availability of ample room to suspend
(and move) the test weights (about 60 cm
downwards should be sufficient).
Force transducer calibration procedure
I
tem Name Description
W2= Enter protection level 2 Enter protection level 2 password.
WT= Wire rupture Disable the wire-rupture, by setting WT to DDD. This prevents that
under certain circumstances the 25 g calibration will be aborted.
EX Exit Exit protection level, which de-activates the wire rupture.
Remove the displacer from the measuring wire and attach the smallest test weight of 25 grams.
Item Name Description
LT Lock test Raise the displacer as high as possible until it is in full view, and good
accessible.
FR Freeze Send a freeze command to stop the displacer movement.
Correct, if necessary temporarily the motor limit high setting MH, in
such a way that the gauge will automatically return to this level after a
lock-test command LT.
BT Balance test Start a balance test. The 854 ATG will measure and calculate an
average frequency at 25 g over one full drum revolution.
This measurement will take approximately 5 minutes.
BF Average measured Standard floating point format; unit: Hz.
frequency Request the average measured frequency BF after completion of the
balance test and note this value for F0. The display will show a BL
(block) or FR (freeze) in the lower right corner of the display.
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