LaMotte DC1100 Colorimeter - Manual (Page 8)

TROUBLE SHOOTING GUIDE (continued)
PROBLEM CHECK ACTION
Suspect
Calibration Verify standard with
alternate test method? Run alternate test on standard.
^ Verify with another
meter? Check other meter calibrations.
^ Contact LaMotte for
return authorization. Return for Calibration check.
^
Meter won’t zero Sample tubes free of dirt
& scratches? Check & replace if necessary.
^ Sample tubes clean? Clean tubes often with soap and a test
tube brush. Do not leave reacted
samples in tubes, staining may occur.
^ Possible internal meter
components subjected to
moisture? Always dry tubes before inserting.
Examine tube chamber for visible
moisture or chemical stains. If yes,
remove 4 screws from back, split case &
dry with hair dryer under low heat (10 -
15 min).
^ LED contaminated with
dirt and deposits? Clean square LED and Photodetector
w/cotton swab & small amount of
alcohol.
^ High suspended solids in
sample blank? Filter with coffee filter, or similar, to
remove most solids. (Be sure to filter
reacted samples as well)
NOTE: Do not use filtered blank for
sample reaction.
Meter read 1 -
w/o samples in
chamber Meter over range? Contact LaMotte for return
authorization & return.
Meter read 1 -
only when samples
in chamber Meter over range? Extremely high concentration, dilute
sample to see if 1 - condition returns to
normal condition.
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