Kistler-Morse KM STXPlus - Manual (Page 14)

CHAPTER 3: STAND-ALONE ANALOG CALIBRATION AND SET UP
The accuracy of the calibration will improve
with a greater quantity of material added
during the calibration procedure. For
example, addign 50% of the vessel’s total
capacity results in greater accuracy than
adding 25% of the total capacity.
Example: Operating in 4-20mA mode,
maximum vessel live load = 100,000lb
(100%), current live load = 25,000lb (25%).
1. Input LO span point as 8mA
corresponding to 25% from Table 3-1.
2. Add 50,000lb to vessel to make current
live load = 75,000lb (75%).
3. Input HI span point as 16mA
corresponding to 75% from Table 3-1.
Table 3-1. Proportional Current Outputs.
Calibration by Adding a Known Quantity
of Material
1. Press the DOWN or UP buttons until the
PARAM LEDs look like:
Press the ENTER button.
2. Press the UP or DOWN buttons until
the appropriate current output is
achieved. Press the ENTER button.
3. Add a known quantity of material to the
vessel.
4. Press the DOWN or UP buttons until the
PARAM LEDs look like:
Press the ENTER button.
5. Press the UP or DOWN buttons until
the appropriate current output is
achieved. Press the ENTER button.
NOTE
If you do not press a button within
15 seconds the STXplus exits the
programming mode. Once step 2 has been
completed above, the LO Span value will be
restored.
Calibration by Subtracting a Known
Quantity of Material
1. Press the DOWN or UP buttons until the
PARAM LEDs look like:
Press the ENTER button.
3. Press the UP or DOWN buttons until
the appropriate current output is
achieved. Press the ENTER button.
4. Remove a known quantity of material from
the vessel.
5. Press the DOWN or UP buttons until the
PARAM LEDs look like:
Press the ENTER button.
6. Press the UP or DOWN buttons until
the appropriate current output is
achieved. Press the ENTER button.
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