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Instruction 24-94486-14
Maintenance
6.8 Cleaning the Probe
The probe tube and gas-sample hose will become dirty under normal use.
Note that the water trap’s filter element should prevent soot from reaching
the analyzer’s internal components. If the probe is not kept clean, it could
become clogged and restrict the flow of gas into the analyzer, resulting in
incorrect combustion test readings and calculations.
NOTE: An analyzer that is used to test natural gas furnaces
normally requires less frequent cleaning than an analyzer used
for testing coal or oil fired furnaces.
Equipment Required:
Alcohol
Aerosol Can of Automotive Carburetor Cleaner
Clean Rag
Source of Compressed Air (optional)
Procedure:
1. Remove gas-sample hose from top of water trap.
CAUTION: Carburetor cleaner attacks plastic components!
Take precautions not to spray cleaner onto the probe handle or
analyzer.
2. Insert the plastic-spray tube of the carburetor cleaner into the gas-
sample hose, and then liberally spray carburetor cleaner through the
hose and out the probe tube.
3. After spraying, remove all the residual cleaner by repeatedly flushing
the gas hose and probe tube with alcohol.
4. Wipe off the surfaces of the probe and tubing with a clean rag.
5. Allow the parts to dry completely. If available, blow compressed air
through the probe to expedite the drying process.
6. Reconnect gas-sample hose to top of water trap.
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