KD2 Pro 6 MAINTENANCE AND TROUBLESHOOTING
mal environment (e.g. insulated chamber or cooler), and allow 15
minutes of equilibration time before taking the measurement. The
Delrin blocks have slightly different thermal conductivities from lot
to lot, so we record the correct values for K, C, and D for your
individual Delrin block are recorded on your Certificate of Quality
Assurance. Your readings should be within 10% of the values on the
certificate
Verification for the TR-1 and optional RK-1 is similar to that for
the SH-1. Place the needle in the block, wait fifteen minutes, taking
care to minimize temperature disturbances, and then take a reading.
The reading of the value recorded on your Certificate of Quality As-
surance be within 10%.
At the request of multiple KD2 Pro operators, we have character-
ized the temperature dependence of the thermal conductivity of the
TR-1 and RK-1 verification cylinders. We collected measurements
on three black plastic cylinders from different lots of material over
the temperature range of −20 to 60
◦
C (Figure 9). We found little
temperature dependence on any of the samples with maximum dif-
ferences over the −20 to 60
◦
C range. The difference is never greater
than 0.004
W
mK
(∼1%). Figure 9 shows a graphical representation of
these values.
Figure 9: Thermal Conductivity as a Function of Temperature.
Error bars represent ±1 standard deviation in five replicated
measurements.
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