Maintenanc e
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Warning!
Before cleaning, always disconnect the unit from the power supply and com-
puter and disconnect all electrical cables.
Make sure the unit is completely dry before re-applying power.
Maintenance schedule
Follow the maintenance schedule below to keep the Hydro dispersion unit working well.
This list is only a guide; the exact frequency at which to perform tasks depends on many
factors, including:
l The samples being measured
l The dispersant being used
l The environmental conditions
l The number of measurements made (frequency of use)
The procedures indicated below for each Hydro dispersion unit are described in their
respective topics.
Hydro MV / Hydro LV
Procedure Period/situation
Inspect cell windows for
dirt and scratches
The cell windows should be checked for general cleanliness every day.
They should also be checked if either of these are seen during a back-
ground measurement:
l One of the first few detectors displays a value above 100 light
energy units.
l Background signal over 20 light energy units recorded byone of
the detectors above detector 20 (see below).
Either of these situations would indicate a poor background; this will
effect the quality of any measurements.
Check the window seals
for damage
At least once a month. Always watch for signs of leaks and rectify imme-
diately.
Clean the covers
Once a month.
Clean the sample flow
path
Contamination by coarse particles or bubbles in the dispersant may
cause fluctuations in the background. Clean the sample path with the
clean options.
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