Kistler-Morse Weigh II, Installation And Operation Manual

Page: 48 / 120

6-10
Chapter 6. Calibration
Note
Changing the values in the linearization
table incorrectly can cause the Weigh
II to display incorrect sensor data. Do
not change the values in the lineariza-
tion table unless one of the above
problems has been noted.
An example is provided below of a situation
where use of the linearization table may be
required:
Example : When your vessel is empty, the
Weigh II correctly shows approximately 0 lbs.
You start putting truckloads of material into
the vessel, and notice the following pattern:
Truck Total Actual Total Indicated
Load Load
0 0
1 5,000 6,000
2 10,000 11,500
3 15,000 16,000
4 20,000 20,000
After the fourth truckload, your indicated load
from the Weigh II is reasonably accurate.
You notice this same pattern and magnitude
of errors every time you start with an
empty vessel.
The Weigh II’s linearization algorithm uses a
five-point piece-wise linearization method with
linear interpolation between points. Figure 6-4
illustrates the linearization operation. Table
6-1 is the default linearization table, consist-
ing of five raw digital count values as inputs
and five corrected digital count values as
outputs. Note that for the default condition,
the raw and corrected values are identical, so
the linearization table will have no effect on
the Weigh II, even if linearization is
On .
Raw Value Corrected Value
1048576 1048576
1112576 1112576
1176576 1176576
1240576 1240576
1304576 1304576
Table 6-1. Default Linearization Table
Consult with Kistler-Morse to determine the
values to input for linearization.
Follow this procedure to enable, disable, and
set up the linearization table.
1. If the Weigh II is in Auto Mode (Auto LED
illuminated), press the Auto/Man Key to
put the system in Manual Mode. The Auto
LED will turn off.
2. Use the Up Arrow or Down Arrow Key to
scroll to the desired vessel.
3. Press the Menu Key to display the Main
Menu. The display shows:
4. Press the F3 Key to access the Cal Menu.
The display shows:
5. Press the Menu Key again to display the
second page of the menu. The display
shows:
6. Press the F1 Key to access the Linear
Menu. The display shows:
An asterisk indicates the current selection
for
On or Off .
7. Press the F1 Key to turn the linearization
table on or the F2 Key to turn the table off.
The display flashes a message acknowl-
edging your selection and
returns to:
An asterisk indicates the new selection for
On or Off .
If you want to change the linearization
table, continue with Step 8. If not, press
the Esc Key to scroll up the menu tree or
press the Auto/Man Key to return the
display to vessel monitoring.
CALIBRATION MENU
Auto Manual
F1 F2 F3
CALIBRATION MENU
Linear
F1 F2 F3
WII MAIN MENU
Disp I/O Cal
F1 F2 F3
LINEARITY MENU
On Off* Set
F1 F2 F3
LINEARITY MENU
On* Off Set
F1 F2 F3