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English 18259
5. MEASURING GASES
After the countdown is finished and the analyser is correctly set up sampling can take
place either by using a sampling tube/probe to reach into ducts or flues or simply by
taking a direct ambient air measurement without a probe or hose connected.
CAUTION: Just by breathing you are emitting a relatively high level of CO
2
in the
local area and this can affect the measurements. We do recommend that a probe or
flexible hose is used so that the point where the ambient air is being sampled is at
least 1 metre away from where anyone is breathing.
Make sure you do not exceed the operating specifications. In particular:
• Do not exceed the probe’s maximum temperature (any plastic parts must not
contact hot flues).
• Do not exceed the temperature operating range
• Do not put the analyser on a hot surface
• Do not exceed the water trap’s levels
• Do not let the particle filter become dirty and blocked
• Ensure that the magnetic boot is free from metallic particles and any surfaces
used when attaching the analyser are appropriate.
View data and rotate the dial to see changes as you make adjustments.
Press HOLD first to hold or ‘freeze’ the readings before printing. Press PRINT to
print the results.
Before starting a test sequence it is recommended to check that the value for CO
reads zero and CO
2
reads about 400ppm in fresh air, if required you can “re-zero” the
sensors by using the ZERO functions in MENU.
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