Operation
Operation 2
2-35
Probe Insertion and Removal Procedure
Caution
To prevent possible damage to probes, make sure all probes
put into the furnace are rated for the temperature range used in
the calibration procedure.
Note
Use a metal or ceramic fiber surface or container is used to set hot probes
on.
A solid (unstirred) mass, as in a furnace, can have heat loss through the
probe stem. The loss changes between probes and temperatures.
For the best stable temperature and minimum gradient, put sample probes into the full
depth of the well. Variation on equipment, probe dimension, and configuration can have
an effect on temperature stability and gradients. At higher temperatures, temperature
stability and gradients between test wells are equivalent. But the length of time for the
wells to become stable is much longer.
Temperature changes at lower temperatures are slow. This is because high integration
values are necessary to keep the controller stable (1,200 seconds) at the lower
temperatures.
9190A
RTD Probe
gzs043.eps
Figure 2-9. Probe Insertion
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