Self Clean Mode - Hach Anatel PAT700 User Manual

Maintenance and Troubleshooting

12.1.3 Self clean mode

Page 170
12. Reconnect the lamp power connectors by carefully reinserting the connectors and
locking them in place by twisting the locking rings clockwise.
13. Close and lock the door.
14. Restore power to the analyzer.
When the analyzer is powered on after the lamp replacement procedure, the analyzer
performs a lamp test to make sure the replaced lamp is working.
It is possible to contaminate the analyzer's measurement cell on any water system or
after long-term storage or inactivity. This condition is indicated by suddenly changing or
erratic TOC or resistivity readings. During self cleaning, the ultraviolet lamp oxidizes
contaminants in the cell to alleviate such problems. The analyzer's sample valve opens to
allow water to flow through the cell. The UV lamp turns on to oxidize any organic
contaminants, which subsequently are flushed from the analyzer by the sample flow.