Before calibrating the Chillgard Monitor, leak-check the sample line(s)
connected to the monitor:
1. Temporarily block the sample inlet at the end-of-line filter(s) and
verify that the monitor gives a Fault alarm.
2. After checking for leaks, remove the sampling line for the Chillgard
inlet.
3. Attach the Calibration Kit connector assembly to the inlet.
Initial Calibration
1. Using the tubing and calibration adapter, place zero gas on the unit
(FIGURE 4-4 or FIGURE 4-5). Allow five minutes for a stable
reading.
2. Using a multimeter to read the 4-20 mA output, use the Calibration
Box to move the zero up or down, until the unit output reads 4 mA
+1 mA with the zero gas applied.
3. Close the regulator valve and remove the zero gas from the
sampling tubing.
4. Apply 100 ppm span gas to the unit for a minimum of five minutes
(FIGURE 4-6).
5. Using a multimeter to read the 4-20 mA output, use the Calibration
Box to move the span up or down, until the unit output reads 5.6
+.1 mA with the 100 ppm span gas applied.
6. Close the regulator valve and remove the span gas from the
sampling tubing.
7. Remove all calibration accessories from the unit to return to normal
operation.
Calibration Guidelines
Once the Chillgard LS Refrigerant Monitor is operating, perform periodic
calibration checks to ensure proper instrument operation.
Perform calibration to monitor long-term changes (drift) in both the
ZERO and SPAN readings. If there is an unacceptable change in either
of these readings, make adjustments to obtain proper readings.
When routine calibration does not restore proper readings, perform the
procedures outlined under "Initial Calibration."
If following Calibration procedures fails to restore proper readings of the
instrument, see Section 5, "Troubleshooting Guidelines" for guidelines
to correct the instrument.
4-9
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