•
Combustion Display 4
• Displays Oxygen (O2) reading in percent (%)
• Displays Carbon Monoxide (CO) reading in parts per mil-
lion (ppm)
• Displaye Excess Air (XAir) in percentage (%)
The formula for CO air free is: COairfree = (20.9/20.9 - O2 meas.) x CO meas.
Pressing the Scroll Enter key changes the display:
•
Combustion Display 5
• • Displays CO air free (-CF-)
CO air free takes into account excess air (make up air) and
factors this out of the displayed reading. Some systems inject
extra air to ensure complete combustion. This can dilute the
CO sample resulting in a low CO reading when the standard
CO display is being read.
This display should be used if the manufacturer specifications are stated
as CO air free. If it is used on a system that is not specified in CO air free
the displayed reading may appear abnormally high as compared to the
manufacturer specification.
Pressing the Scroll Enter key again will make the display return to combus-
tion display 1 (Default display)
6. During a combustion test you can save, print, and send data to a comput-
er. See pages 25 through 31. Allow readings to stabilize before saving or
printing the data. Refer to page 19 for typical test results.
7. Pressure measurements can be made during a combustion test if required.
Refer to page21.
8. After the test is complete, remove the flue probe from the test location and
allow the analyzer to purge in a fresh air environment with the probe
attached. Make sure the analyzer purges to below 15ppm. Never remove the
battery to turn the analyzer off before the purge is complete. Refer to page 9
for complete instructions.
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