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D-Guard² Instruction Manual
18.4 Set Zero Gas Concentration
Access the Sensor Settings Menu. See
Step 1. Use
to exit or
Step 3. Use
to return to the settings menu.
NOTE: The zero gas must be greater than or equal to zero.
NOTE: Fresh air can be used in place of zero-grade air.
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.
Figure 16. Zero Gas Concentration Warning.
28
section
to set the span gas.
18.1.
Step 2. Use
to adjust then
Step 4. Use
to go back or
to save.
to continue.
Item Number 201018
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