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Advanced
™
Osmometer Model 3250 User’s Guide
The calibration procedure is as follows:
1. At Osmometer Ready (or the date and time standby display), press
CALIB.
The CALIB key will light and the display will quickly change to
Calibration, then prompt you for the first calibration standard.
2. If the sample probe is replaced, the sample probe bin # must be
determined and set before the 3250 can be recalibrated.
3. Load the standard sample prompted by the display into the
freezing chamber and press START.
The display will change to Cooling Sample, the operating head will
lower, a calibration test will be run and the results will be displayed
and recorded internally.
Continue loading and testing standard samples at the first
calibration level until prompted by the display for a sample at the
second calibration level.
Three samples are required at the first calibration level of the Low
range. Do not load samples at the second calibration level until
prompted by the display; to do so may cause a Calibration Out of
Range; Repeat Calib error message.
At least six samples are required at the second calibration level of
the Low range, and at each calibration level of the High range.
When calibration tests have been acceptably completed at the first
calibration level, the instrument will calculate and store the mean
of the raw values of the closest tests, then prompt the operator
for samples at the second calibration level. The calibration will not
actually be changed until all calibration tests have been acceptably
completed at both calibration levels.
When six calibration tests have been acceptably completed at the
second calibration level, the instrument will calculate and store the
mean of the raw values of the closest tests, recalibrate the readout
and display Calibration Complete.
4. At Calibration Complete press STOP to return to Osmometer Ready,
CALIB to restart the calibration sequence, or START to lower the
operating head and start a regular freezing point test.
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