Kistler-Morse KM Weigh II - Manual (Page 44)

6-6
Chapter 6. Calibration
10.Using the keypad or the Up and Down
Arrow Keys, input a value equal to the
estimated quantity (Step 7) minus the
known quantity (Step 8). Press the Enter
Key to save the value in memory. Lo Span
is now set [point (1) in Figure 6-3]. The
display flashes a message acknowledging
your entry and returns to:
11.Press the Esc Key to scroll up the menu
tree or press the Auto/Man Key to return
the display to vessel monitoring.
Note
Shifting the line from the dashed line to
the solid line in Figure 6-3 is accom-
plished by setting zero. The procedure
to set zero is described in Refining the
Calibration by Setting Zero in this
section. Set zero when the vessel
contains a known quantity of material
(usually none) at a later date.
Refining the Calibration by
Setting Zero
The Zero_Cal Menu is used to allow the
Weigh II to establish the zero live load point
of the vessel. Setting zero translates the
calibration line of Figure 6-3 from the dashed
line to the solid line position. Entering a
weight value in Zero_Cal establishes point (3)
in the figure. This weight value must be
entered only when there is a known quantity
of material in the vessel (usually zero
material, but it can be a known, non-zero
quantity) that equals the entered value. Using
the Zero_Cal Menu is often done at some
time after the initial installation and calibration
of the Weigh II, when it is practical to empty
the vessel and refine the calibration.
The Zero_Cal function may be used to
compensate for the following circumstances:
• The estimated weight value used when
performing a calibration by adding or
subtracting a known quantity of material is
off by a greater margin than can
be tolerated.
• The vessel was not completely empty at
the start of a high-accuracy calibration
procedure.
Note
The Zero_Cal function cannot “repair”
a calibration in which the known
quantity added or subtracted was
actually incorrect, because the slope
of the line is not affected by setting
zero. If necessary, recalibrate.
Follow this procedure to refine the calibration
by setting zero.
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 turns 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 F1 Key to access the Auto
Menu. The display shows:
6. Press the Menu Key to access the second
page of the Auto Cal Menu. The display
shows:
7. Press the F1 Key to access Zero_Cal. The
display looks like this:
The unit of measure you set up in the
Units Menu shows in place of lbs.
WII MAIN MENU
Disp I/O Cal
F1 F2 F3
AUTO CAL MENU
LoSpan HiSpan
F1 F2 F3
AUTO CAL MENU
LoSpan HiSpan
F1 F2 F3
CALIBRATION MENU
Auto Manual
F1 F2 F3
AUTO CAL MENU
Zero_Cal Disply
F1 F2 F3
ZERO CALIBRATION
> X lbs
F1 F2 F3