Hoefer DQ300 - Manual (Page 23)

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4. General Considerations
for Analysis
4.1 Handling Samples
1
Be cautious not to spill samples into the sample
chamber. Promptly wipe any spills.
2
The DQ300 is very sensitive and even small amounts
of material from a previous sample may result in
errors. Use a clean cuvette or disposable cuvette for
each reading.
3
Fill the cuvette to the minimum required volume or
a significant error will result. A minimum volume
of 2 mL in a 10 × 10 mm cuvette, or 50 µL in a
Minicell, is required for best results.
4
The cuvette MUST BE CLEAN AND DRY on the outside
when taking readings. Moisture and condensation on
the outside can result in error.
5
Minute bubbles in samples will cause errors in read-
ings. Be sure not to introduce bubbles into samples.
Particular care must be taken with the Minicell. Slight
tapping on the outside cuvette wall will often help
dissipate bubbles.