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b. Use a pocket knife with a flat blade to scrape across the probe surface
PERPENDICULAR to the carbons.
c. Lay a piece of sandpaper (200 grit or finer) on a flat surface such as a bench top.
“Sand” electrode to remove stubborn deposits. (Do not wipe surface with your finger.
Oil from your skin will foul carbon tips.
5. Reinstall the electrode in the system. After the reading stabilizes, calibrate the unit to a
reliable test reading.
Many times an electrode can appear to be clean, but the unit still cannot be calibrated. If this is the
case, use one of the more aggressive electrode cleaning procedures listed in step 4 above. Recheck
the calibration after completion of this procedure. If no change was observed in the reading, replace
the electrode. If a change occurred but the unit still will not calibrate, repeat procedure as many times
as necessary.
A. Standard TE-4A Electrode
B. Optional Flow Switch Assembly
