Maintenanc e
101
It is important that the datum/position points in the corners of the cuvette holder and
cuvette are kept clean. Any dirt may cause cuvette misalignment and therefore affect the
measurement.
Clean the cuvette body and cuvette holder using IPA and optics cloth. This is to minimize
the risk of cuvette contamination.
Cleaning and handling the stirrer bar
Follow the below guidelines for cleaning and handling the stirrer bar
1. Clean the stirrer bar in a small amount of IPA.
2. It is recommended to use the Malvern supplied stirrer bar. Other stirrer bars may
have a different diameter and different magnetic qualities that may affect the
sample dispersion within the cuvette, as well as its coupling to the stirrer motor.
3. Inspect the stirrer bar before use. A worn, damaged or dirty stirrer bar may not
rotate correctly and will therefore not disperse the sample sufficiently.
4. Make sure that the stirrer bar is not placed near any external magnets, or a mag-
netic probe is used to remove the bar from the cuvette after use. This may demag-
netize the stirrer bars coupling to the stirrer motor thus affecting its rotation and
dispersion performance.
5. Never run the stirrer motor if a dry cuvette is fitted with the stirrer bar inserted.
The stirrer bar will spin directly on the windows possibly scratching the cuvette
windows.
6. It is recommended to only run the Hydro SV only as long as necessary for the dis-
persion or measurement.
External dispersant pump procedures
If the external pump is not to be used for long periods of time, it is recommended that
the pipe is removed from the accessory and the pumphead. This will maximize the life of
the pipe.
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