D-Guard² Instruction Manual
Item Number 201018
28
18.4 Set Zero Gas Concentration
NOTE: Fresh air can be used in place of zero-grade air.
NOTE: The zero gas must be greater than or equal to zero.
Figure 16. Zero Gas Concentration Warning.
Access the Sensor Settings Menu. See
Step 1
. Use to exit or to set the span gas.
Step 2
. Use to adjust then to save.
Step 4
. Use to go back or to continue.
Step 3
. Use to return to the settings menu.
CAUTION: Do not use fresh air for Carbon dioxide sensor zero calibration. Fresh air contains
low levels of Carbon dioxide. You must use zero grade air or nitrogen instead.
CAUTION: The zero gas must not be less than zero. If you try to set the zero gas
concentration less than zero the D-Guard² will show you.
