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Advanced
™
Osmometer Model 3250 User’s Guide
Repeatability Tips
• Sample tube cleanliness is extremely important for repeatability.
Glass tubes should be washed in hot water containing a nonionic
detergent, rinsed in distilled water, and thoroughly dried before
each use.
• Always treat all samples uniformly before the test. Treat
standards and reference solutions the same as the unknowns.
Do not intermix different tube styles.
• To avoid contamination and evaporation, cover all samples not
immediately being tested.
• Use the same sample size consistently (i.e., during calibration,
testing, etc.).
• For repeat runs, use another sample from the same source or
thaw the original sample before repeating. If you must rerun the
same sample or use it for another procedure, remove it from
the freezing chamber as soon as possible and keep it covered
between tests.
• Always use the same operating procedure as proper, consistent
procedure is the key to repeatable results.
• The first reading in any given period of operation may be
slightly off because of temperature conditioning or residual
contamination of the probe. Subsequent readings on aliquots
of the same sample should group within the specifications as in
Appendix B, if you practice good operating techniques.
• If an occasional sample produces irregular results, discard
obviously discrepant readings as long as the instrument has
been producing accurate readings repeatedly. Repeat the
reading in question.
• Do not reuse plastic sample tubes or cleaning materials. Discard
after each use.
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