3-2 SECTION 3 – MAINTENANCE
5. Unthread the retaining nut and pull bob assembly out of measurement head. The bob
assembly is held magnetically.
Caution: Do not place the bob assembly near magnetic materials because of the
strong magnets.
6. Clean and wipe any residue from the bob assembly. Be careful not to scratch the bob or
shaft as this will cause measurement error. Flush the internal cavity of the assembly and
use a nylon pipe cleaner, if necessary, to clean all residue.
7. Reinsert the bob assembly into the measurement head and tighten the plastic nut.
8. Before installing the measurement head back onto the viscometer, clean the vessel with a
hose to remove any remaining fluid. Clean and wipe interior surface of rotor to remove
any residue. If required, the rotor assembly can be removed for further cleaning. First
unthread the coupling nut for the motor.
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