Multi-Zone Gas Monitors
P/N: 3015-5074 Rev 11
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IMPORTANT:
Changing information on CAL FA CTOR will void the factory calibration.
Typically, the unit will remain within the factory-calibrated accuracy indefinitely and no
calibration is required. Complex soft ware algorithms adjust for temperat ure drift, IR source
aging, and pressure changes in order to keep the unit within factory accuracy
specifications.
4.7.2. Navigating to the Calibration Screen
On the System Setup screen, select the Calibration option (
CAL).
Figure 4-11. Calibration Screen (HGM and AGM Only)
4.7.3. Calibration Procedure (HGM and AGM Only)
The CAL FACTOR is determined by sampling a known dilution of the type of gas to be sampled. Calibration
is best performed at or near full scale. 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 the desired 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 MZ monitor should be operating for at least one hour prior to performing a calibration.
Prepare the MZ for sampling by initially setting its CAL FACTOR to 1.000. Next, set up the MZ for a logging
interval of zero minutes, and place the MZ monitor in its zone hold mode for the zone you wish to use for
calibration purposes.
Connect the sample bag directly to the intake port for the zone you have set up and allow the MZ monitor to
sample the entire bag. When sampling is complete, view the trend data for the zone used to sample. 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. This value is stored in non-volatile memory.
4.7.4. Adjusting Calibration Factor (HGM and AGM Only)
The factory default cal factor for standard units is 1.000. This value may be different if the high accuracy
option is ordered.
Proceed as follows to adjust the current calibration factor:
1. Use the PREV GAS or NE XT GAS options to scroll through the list of gases until the gas you wish
to work with is displayed.
2. Select the CAL FACTOR option to edit the value.
3. Use the LEFT/ RIGHT cursor keys to move across the entry field and the UP/DOWN cursor keys
to modify the individual numbers.
4. Press ENTE R to accept the new entry or ESC to revert to the previous setting.
Summary of Contents for MultiZone
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