6-4 Maintenance & Service
6.1.2 Cleaning the Wash Head
The Wash Head cleans the outer surface of the sample needle with a saline Diluent. If the Wash Head
itself is not cleaned regularly, salt can accumulate on the bottom surface, leading to inaccurate test
results, extra blanks being needed, and excess reagent use.
1. If the analyzer displays a message that Wash Head cleaning is
due, select Clean or Next to begin cleaning. If running this pro-
cess manually (that is, without prompting by a pop-up), select
Maintenance from the Home screen > Cleaning > Clean the
Wash Head.
The analyzer then displays cleaning instructions, as detailed in
the following steps.
Note: Do not clean the Wash Head without activating the HM5’s software as
described in this procedure. Otherwise, the needle assembly may not
move correctly, and the analyzer will need to be restarted.
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