Kistler-Morse KM STXPlus - Manual (Page 12)

CHAPTER 3: STAND-ALONE ANALOG CALIBRATION AND SET UP
NOTE
The STXplus must be in gross mode prior to
calibration.
ANALOG CALIBRATION
Analog calibration calibrates the STXplus
“analog engine.”
There are three methods for performing an
analog calibration:
1. High-accuracy calibration.
2. Calibration by adding a known quantity of
material.
3. Calibration by subtracting a known
quantity of material.
Each method requires moving a known
quantity of material into or out of the vessel.
The high-accuracy calibration requires the
vessel be completely empty or completely
full to start. The latter two methods do not
provide the highest possible accuracy.
However, they do provide accurate
calibration. If you need the greatest
accuracy, perform a high-accuracy
calibration.
Before starting calibration, connect an
ammeter to the STXplus. See Figure 3-1 on
Page 3-1.
If a current monitoring device is connected
to the 4-20mA loop, connect an ammeter in
series with the device.
Figure 3-2. High-Accuracy Calibration.
If a monitoring device is not being used,
connect the ammeter positive (+) lead to the
positive (+) terminal of the current loop.
Connect the negative (-) lead to the negative
(-) terminal of the current loop.
If the STXplus is off, apply power and let it
warm up for at least 15 minutes before
proceeding.
High-Accuracy Calibration
This procedure provides the highest
accuracy, but requires the vessel be
completely empty or completely full. The
principle behind the calibration is shown in
Figure 3-2 for starting with an empty vessel.
Starting with an Empty Vessel
1. Empty the vessel completely.
2. 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
(0mA if in 0-20mA mode, 4mA if in
4-20mA mode, or 20mA if in either
20-4mA mode or 20-0mA mode). Press
the ENTER button.
4. Fill 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
(20mA if in 4-20mA or 0-20mA mode,
4mA if in 20-4mA mode or 0mA if
in 20-0mA mode). Press the ENTER
button.
3-3