6. Close the regulator valve and remove the span gas cylinder from
the sampling tubing.
7. Remove the calibration cap and the calibration box from the unit to
return to normal operation.
8. Replace lid on the enclosure.
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.
Keep written records of the calibration readings obtained and any
adjustments made. Analysis of these records enables review and
control of the time between checks.
Check a new Chillgard LS Refrigerant Monitor installation at least once
a week by performing the steps outlined in the following section.
Calibration Equipment
Calibration of the monitor requires a supply of:
• ZERO GAS (nitrogen) It may be possible to use ambient air if you
are sure it does not contain any possible interferant gases or
contaminants.
• SPAN GAS (A known gas concentration that measures
approximately 10% of the full-scale calibration of the unit.
Carefully apply both ZERO gas and SPAN gas to the unit to avoid
pressurizing the internally mounted sensing cell. See TABLE 5-2,
"Calibration Accessories Parts List" for the appropriate calibration parts
and calibration gases available for the Chillgard LS Refrigerant Monitor.
The following equipment is required to calibrate the unit:
4-4
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