KM SVS2000, Installation & Operation Manual, Page: 40 / 89

36
97-1129-01 Rev. D
www.kistlermorse.com
8. Press the enter key to access the Hi Span Cal menu. The display looks like this:
> ------ lbs
(Units are consistent with Disp Units.)
9. Use the numeric or Arrow Keys to input a value that represents the quantity of material added to the
vessel. Press the Enter Key to save the value in memory. The display acknowledges the entry and
returns to:
HI SPAn CAL
10. Press the Gross or net Key to return to Run Mode.
The SVS2000 is now calibrated to the highest accuracy.
calIBraTIon By addIng a KnoWn quanTITy oF MaTerIal
This calibration method does not require the vessel to be completely empty. The principle behind the calibration
follows.
A weight estimated to be the quantity of material in the vessel is entered as the Lo Span weight [point (1) in
Figure 8]. A known quantity of material, representing at least 25% of the vessel’s total capacity, is added to the
vessel. The sum of the known quantity plus the estimated quantity is entered as the
Hi Span weight [point (2) in Figure 8]. The SvS2000 saves in memory the Lo Span and Hi Span weights as
well as the digital counts associated with each weight. These values define the dashed straight line and the
calculated Zero Counts shown in Figure 8.
The slope of the line is called the Scale Factor, which is calculated internally. The slope of the line is reasonably
accurate, because it is calculated based on the known difference between the Lo Span and Hi Span weights
and counts. However, if the estimated Lo Span weight is incorrect, the actual ‘location’ of the line is incorrect,
resulting in errors in monitoring. The greater the error in the estimated Lo Span, the greater the resulting error.
The ’location’ of the line can be adjusted to the solid line by entering a Display value Correction [point (3) in
Figure 8] (see refining the Calibration with the Display value Correction in this section).
The greater the known quantity of material added during the calibration procedure, the greater the accuracy
of the calibration. Adding 50% of the total capacity results in greater accuracy than adding 25% of the total
capacity. Follow this procedure to calibrate by adding a known quantity of material:
1. If the SVS2000 is in Run Mode, press the ‘2’ Key, ‘1’ Key, and Enter Key to access the menu tree. The
display shows:
21 AuTO CAL
2. Press the enter key to access this menu. The display shows:
LO SPAn CAL
3. Press the enter key to access the Lo Span Cal menu. The display looks like this:
> ------ lbs
(Units are consistent with Disp Units.)