50
Advanced
™
Osmometer Model 3250 User’s Guide
Note The buzz point should be at least 1200 mOsm higher than
the expected test value.
4. Press ENTER to store the new setting (or STOP to restore the
original setting).
Note Each time the buzz point is changed, the instrument
displays the message Check Calibration, a reminder that
the instrument calibration is affected by the amount of
supercooling.
16. Select Range
This menu item enables optimizing the 3250 test parameters for a
wider osmolality range than can be accommodated by a single set of
test parameters. Two ranges are provided:
• Low range sets the 3250 to operate between 0 and 2000 mOsm.
• High range sets the 3250 to operate between 1500 and 4000 mOsm.
Independent calibration parameters are maintained for each range (see
Chapter 4 for calibration instructions). Generally, each range requires a
different crystallization temperature ("buzz" point). See item 15, above.
To change the test range:
1. At Select Range, press START to display [low] range >[high].
2. At [low] range >[high], press < or > to toggle between the low and
high ranges.
3. Press ENTER to store the new setting (or STOP to restore the
original setting).
Note Each time the range is changed, the instrument displays the
buzz point for the range selected.
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