Teledyne 6650 - Fluorescence Probe - Oil in Water analysis system - Manual (Page 32)

Setup & Operation Model 6650
24 Teledyne Analytical Instruments
f) Dampen a cotton swab or lint free cloth with the
rinse solvent and gently rub the optical surface.
g) Air-dry the probe for a few minutes.
h) Reinsert into the process and follow the required
initialization sequence (see above)
4) If Step 1-3 are not sufficient to return the Fluorometer to
operation, contact TIA for assistance.
5.8.3 Rectifying the Problem: Red Indicators
If there has been a major change in the probe installation or process
piping. Most likely, there is a stray light leak into the system. Verify
that the monitoring location is in complete darkness. If stray light is not
present at the monitoring location, contact TIA for assistance.