Maintenanc e
77
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 by one 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.
Inspect and clean the tank
If the dispersant type is changed, or if sample is seen to adhere to the
sample head and the normal clean routines fails to remove it.
Replace the dispersant
pipe
If the pipe leaks or becomes discolored. This may allow bubbles to enter,
causing rapid fluctuations in the background .
Perform a Quality Audit
Standard measurement
At least once a week or as internal quality procedures specify.
Hydro SV
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 by one 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.
Clean the covers
Once a month.
Check cuvette body for
leaks and damage
Periodically check for leaks from the cuvette body. if leaks occur or dam-
age is visible contact Malvern instruments
Pipette guide pipe
Clean as necessary. Check for damage and make sure guide pipe align-
ment for sample addition into the cell is correct.
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