Hach-Lange POLYMETRON 9611 sc Maintenance and Troubleshooting - Manual (Page 6)

New tubing, valves and other sample conditioning equipment may be
contaminated with silicate-based substances (oils, dust). These may
contribute to slightly high readings until they are cleaned.
1. Flush the sample line with sample for one to two hours.
2. For an expedient procedure, inject one to four liters of a dilute caustic
solution such as 1N (5%) sodium hydroxide solution into the front
end of the sample line. Force the solution through the analyzer to
clean sample system components.
Clean the sample cell
C A U T I O N
Chemical exposure hazard. Obey laboratory safety procedures and
wear all of the personal protective equipment appropriate to the
chemicals that are handled. Refer to the current safety data sheets
(MSDS/SDS) for safety protocols.
Put the analyzer in shutdown mode. Refer to Put the analyzer in
shutdown mode on page 5.
Clean the sample cell in the colorimeter as needed. Refer to Figure 1
and Figure 2 .
Items to collect:
• Cotton swabs, wooden or paper. Do not use swabs with plastic sticks.
Figure 1 Funnel and colorimeter access
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