IMPORTANT: Prior to taking a sample, the device under test should be on and
at operating temperature. Putting the flue probe in the sample area prior to
starting the device may cause saturation of the sensors due to the higher
initial concentration of carbon monoxide that may be encountered upon
start up. If this happens, allow your analyzer to purge in fresh air until the
carbon monoxide level returns to 0 ppm and the oxygen level returns to
20.9%. This may take more than an hour depending on how saturated the
sensors are.
3. Drill a 1/4 inch hole into the flue of the device under test. For most applica-
tions, flue gas samples should be taken prior to the draft diverter or any
other opening that allows room air to enter the system. This prevents room
air from mixing with gases in the flue and diluting the test sample.
It is important to use manufacturers recommended test locations whenever
possible.
Refer to the figure below for calculating the sample hole location.
The figures on the following pages show typical test locations on commonly
encountered equipment.
12
TYPICAL TEST LOCATIONS
Atmospheric Gas Fired Fan Assist Boiler / Furnace
Typical Test Locations
Figure 1
It is important to use manufacturers recommended test locations
whenever possible.
13
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