STX Signal Transmitter Installation and Operation ... - Kistler-Morse

Chapter 7. MVS-STX Calibration Menu
errors in channel monitoring. The greater the
error in the estimated Hi Span, the greater the
resulting error. The ‘location’ of the line can be
adjusted to the solid line by setting zero
[point (3) in Figure 7-3] (see Refining the
Calibration by Setting Zero in this section).
Similar to the other calibration methods, the
greater the known quantity of material moved
during the calibration procedure, the greater the
accuracy. Removing 50% of the total capacity
results in greater accuracy than removing 25%
of the total capacity.
Follow this procedure to calibrate by
subtracting a known quantity of material:
1. If in Auto Mode (Auto LED illuminated),
press the Auto/Man Key to put the MVS in
Manual Mode. The Auto LED turns off.
2. Use the Arrow Keys to scroll to the
desired channel.
3. Press the Menu Key to display the Main
Menu. The display shows:
MAIN MENU
Disp I/O Cal
F1 F2 F3
4. Press the F3 Key to access the Cal Menu.
The display shows:
CALIBRATION MENU
Auto
Manual
F1 F2 F3
5. Press the F1 Key to access the Auto
Menu. The display shows:
AUTO CAL MENU
LoSpan
HiSpan
F1 F2 F3
6. Press the F3 Key to access HiSpan. The
display looks like this:
HI SPAN AUTO CAL
> 9999 lbs
F1 F2 F3
(Units are consistent with Units Menu.)
7. Use the keypad or Arrow Keys to input a
value that represents the estimated
quantity of material in the vessel. Press the
Enter Key. The display acknowledges the
entry and returns to:
AUTO CAL MENU
LoSpan
HiSpan
F1 F2 F3
Note
If the removal process takes a long
time and you need to use the MVS to
roughly monitor vessel contents during
removal, enter ScfCnt, ScfWgt, and
then Zero_Cal now. (If you do not,
disregard channel monitoring data until
you complete the Auto Calibration in
Steps 8 through 10.) Complete the
Auto calibration as described below.
8. Remove a known quantity of material,
that represents at least 25% of the
vessel’s total capacity, from the vessel.
9. Press the F1 Key to access LoSpan. The
display looks like this:
LO SPAN AUTO CAL
> 0 lbs
F1 F2 F3
(Units are consistent with Units Menu.)
10. Using the keypad or Arrow Keys, input a
value equal to the estimated quantity
(Step 7) minus the known quantity
(Step 8). Press the Enter Key. The
display acknowledges the entry and
returns to:
AUTO CAL MENU
LoSpan
HiSpan
F1 F2 F3
11. Press the Esc Key to scroll up the menu
tree or press the Auto/Man Key to return
to channel monitoring.
Note
Shifting from the dashed to the solid
line in Figure 7-3 is accomplished by
setting zero when the vessel contains
a known quantity of material (usually
none) at a later date. This procedure is
described in Refining the Calibration
by Setting Zero in this section.
Refining the Calibration by
Setting Zero
Zero_Cal is used to allow the MVS to
establish a known live load. Setting zero
translates the calibration line of Figure 7-3
from the dashed line to the solid line position.
Entering a weight value in Zero_Cal establishes
point (3) in the figure. This weight must
be entered only when there is a known
7-5