Specifications

Halogen Gas Monitor – MultiZone Remote Display
Instruction 3015-5157 42
Calibration Procedure on Main Monitor
The CAL FACTOR is determined by sampling a known dilution of the type of refrigerant gas to be sampled.
The sample must be prepared to less than half the desired accuracy and the concentration must be corrected
for ambient temperature and pressure at the time of measurement.
Calibration is best performed at or near full scale (1,000 PPM). It can, however, be done at any
concentration, and ideally in the range where maximum accuracy is desired down to, but not below,
100 PPM.
A cylinder of refrigerant gas at a certified PPM level must be used to assure sampling occurs at ambient
conditions. A minimum sample size of 5 liters is required.
The HGM should be operating for at least one hour prior to performing a calibration.
Prepare the HGM-MZ for sampling by initially setting its CAL FACTOR to 1.000 (Page 42). Next, set up the
HGM-MZ for a logging interval of zero minutes (Page 26), and place the HGM-MZ in its zone hold mode for
the zone you wish to use for calibration purposes (Page___).
Connect the sample bag directly to the intake port for the zone you have set up and allow the HGM-MZ to
sample the entire bag. When sampling is complete, view the trend data for the zone used to sample
(Page 38). Read the measured PPM by placing the cursor on the spikes cause by the sample. If the bag
was large enough for multiple samples, average the most stable ones.
The new CAL factor is computed by dividing the known gas value by the measured value. Typically this value
will be between 0.95 and 1.05. Enter the computed CAL factor into the monitor using the HGM-RD (Page 42)
or PC software. This value is stored in non-volatile memory.
Programming New Gasses (I didn’t see any optionon the unit to perform this. Did I miss
something?)
As new refrigerants come into use the HGM-MZ allows the addition of these new gases to its on-board
refrigerant gas library. At the end of the gas library list is an option labeled CUSTOM for adding new gases.
From the Calibration Screen use the LEFT/RIGHT arrows to select CUSTOM from the list of refrigerants.
Next, press ENTER, and use the UP/DOWN arrow keys to enter the calibration factor. The selection of the
matching gas and CAL factor is performed by Bacharach by analyzing the new refrigerant. When the
matching gas is determined, field calibration is possible by using the same procedure as for other refrigerants.
When the new gas entry is complete, setup the appropriate zone for CUSTOM.
Program the instrument for a new gas as follows:
From the Calibration Screen, use the PREV GAS or NEXT GAS options to scroll through the list of available
choices until the CUSTOM option is displayed.
Custom Gas Screen?