Specifications

PCA

6.6 Cleaning the Probe

The probe tube and gas-sample hose will become dirty under normal

use. Note that the water trap’s ﬁ lter 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 ﬂ ow 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 ﬁ red 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

ﬂ ushing 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.