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:
• Calibration Gas
• Meter capable of monitoring the output, either milliamps or volts.
Calibration Check Procedure
The calibration procedure involves checking the SPAN and ZERO
readings on the instrument. During the calibration check procedure, any
control instrumentation connected to the Chillgard LS Refrigerant
Monitor may activate. Disconnect or disable any equipment or alarms
connected to the monitor during the calibration procedure.
Zeroing the Monitor
When zero gas is required, attach a zero gas scrubber or zero gas
cylinder to the connector as shown in FIGURES 4-4 and 4-5.
If the sampling line is not re-attached, the monitor cannot
sample from the remote location.
"!
WARNING
4-10
To Next Page
Loading...
