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KD2 Pro Operator’s Manual
5. Good Practices
dry granular materials and powders have large contact resis-
tance. Always use the TR-1 or SH-1 sensor in these types of
materials.
Avoid convection in liquid samples.
See the next chapter
for a more detailed explanation about this.
3.
Don't bend the needles.
Needle spacing on the dual
needle sensor is critical for accurate measurements. A 1%
change in needle spacing results in a 2% error in measure-
ment of diffusivity and specific heat. A guide is provided
for maintaining proper needle spacing during insertion of
the sensor into a sample. The Delrin verification block
included with your system shows the correct sensor spac-
ing. If a needle is slightly bent, it can be carefully straight-
ened until the tip spacing matches the hole spacing in the
calibration block.
