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Troubleshooting & Service
22. If the current sample bin number setting is not the same as that just
determined, enter the correct bin number by means of the numeric
keypad; then press the ENTER soft key. The display will change to
“Set Sample Bin #”; then press the STOP soft key to return to
“Cryoscope Ready”. If the current sample probe bin setting is the
same as that just determined, simply press the STOP soft key twice
to return to “Cryoscope Ready”.
23. Press the CALIB soft key and calibrate the instrument as recom-
mended in Chapter 4. Recalibration is required each time the sam-
ple probe is replaced.
Mandrel, probe and stir/freeze wire alignment
Probe and stir/freeze wire alignment using the alignment tool
(see Figure 9):
Proper alignment and adjustment of the mandrel, probe and stir/freeze
wire are of utmost importance to assure accuracy, precision and proper
operation of the instrument.
NOTE After making any probe and/or stir/freeze wire adjustments, the
instrument calibration must be checked and adjusted as neces-
sary.
To facilitate positioning of the probe and stir/freeze wire, a probe align-
ment tool is included with the instrument and with each replacement
sample probe. Alternatively, the probe and stir/freeze wire can be
aligned using a sample tube containing 2-mL of water. Both procedures
follow.
1. Slide the tool squarely up onto the mandrel, round end first, with the
stir/freeze wire located as shown in Figure 9. Note that with
cryoscopes the tool must be rotated 90° from its position with
osmometers.
2. If aligning a metal probe, bend the metal probe stem gently by hand,
as necessary, to align the probe along the RAISED V CENTERLINE
of the probe alignment tool.
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