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Instrument Operation
If you are running the instrument for the first time, it is
recommended that you follow the Clinitrol
™
Reference Solution
samples with bracketing calibration standards to check the
instrument accuracy and linearity over the range of interest.
– If the instrument accuracy on the reference solution (and/or
calibration standards) is not satisfactory, refer to Calibration.
– If the instrument repeatability on the reference solution (and/or
calibration standards) is not satisfactory, refer to Standards and
Quality Control.
– If the accuracy and repeatability on the reference solution (and/
or calibration standards) are satisfactory, you may begin testing
unknown samples, using exactly the same test procedure as for
the reference solution and standards.
12. Always wipe the probe, stir/freeze wire, mandrel and the top of
the freezing chamber with a soft, clean and dry, lint-free, single-
use paper tissue after the last test, to avoid having contaminating
material dry on the probe. Be careful not to bend the probe or stir/
freeze wire.
13. Leave an empty sample tube in the freezing chamber to prevent
debris from entering the well.
The 3250 may be left on continuously. When idle for five minutes or
more, it automatically enters standby mode: the fan slows, the freezing
chamber warms slightly and the display changes to the date and time.
The 3250 remains in the standby mode until another test is needed. It
automatically exits from standby mode when any keypad is pressed.
Sample test errors
Occasionally a test will not run to completion and your instrument will
display an error message. Refer to the Troubleshooting Table at the
end of this user’s guide for an explanation of a particular message.
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