77
Troubleshooting and Service
Mandrel, probe, and stir/freeze wire alignment
Alignment using the alignment tool
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
necessary.
To facilitate positioning of the probe and stir/freeze wire, a probe
alignment tool is included with the instrument and with each
replacement sample probe. Replacement probes for the 3250 are
pre-mounted in a mandrel at the proper vertical location. To realign the
probe and/or stir/freeze wire, use the following procedure:
Make sure the stir wire
does not rub on the sides
of the slot in the mandrel.
This portion of the stir wire
should
be parallel to sample probe,
and the space should be
about .04 inches (1 mm).
End of stir wire should
rest on this small step.
Bottom of
sample probe
should rest on
this level.
Mandrel
Raised V
Centerline
Alignment Tool
Sample Probe
Stir Wire
Figure 8: Probe and Stir/Freeze Wire Alignment
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