Specifications

Multi-Zone Gas Monitors
42 P/N: 3015-5074 Rev 10
NOTE: The CO
2
calibration is a more complex, 2-point calibration. CO
2
units are factory
calibrated and not intended to be calibrated in the field. Refer to screens in section 4.7.5
for CO
2
calibration screen details.
4.7.5. CO
2
Atmospheric Concentration
Because CO
2
is present in ambient air, a relative reading is used to determine the amount of CO
2
coming
from a leak. The CAL screen offers the ability to manually enter the ambient CO
2
concentration. This value
is typically in the range of 380-400 ppm, however concentrations may vary slightly based on geographic
locations or other factors (the factory default setting is 386 ppm).
IMPORTANT: The ambient CO
2
level is set at the factory to 386 ppm and will likely not
need to be changed. If, however, the ambient CO
2
concentration at your location is known
to be a value other than this default value, then the instrument’s ambient CO
2
setting may
need to be changed.
If needed, adjust the ambient CO
2
concentration as follows:
1. From the SYSTEM SETUP menu, navigate to the CAL screen.
2. Ensure the GAS TYPE setting is selected (see Figure 4-12) and press ENTER.
3. CO
2
calibration curve options are displayed. Simply press ENTER to access the ambient CO
2
concentration setting (PPM IN PURGE). See Figure 4-12.
4. Use the UP/DOWN cursor keys to modify the numbers to set to the appropriate value.
5. Press ENTER to accept the new entry or ESC to revert to the previous setting.
Figure 4-12. Accessing the CO
2
Atmospheric Concentration Setting (PPM IN PURGE)
IMPORTANT: Do not alter any other parameters within the Calibration Menu as this will
alter the factory calibration.
4.7.6. Programming New Gases (HGM Only)
As new gases come into use the MZ monitor allows the addition of these new gases to its on-board 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 gases. 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 gas. Once the matching gas is
determined, field calibration is possible by using the same procedure as for other gases. When the new gas
entry is complete simply setup the appropriate zone for CUSTOM.