Stop data-collection by separating the MemoryPaq from the Transducer
Interface. A slowly-flashing red LED indicates that the logger holds data that has
not yet been downloaded to the PC.
It is normally convenient to leave the thermocouple probes attached to the
Transducer Interface.
Leave the thermal barrier and heatsink in the open to cool to ambient
temperature. Cooling overnight is usually sufficient, but an additional barrier
should be purchased if insufficient time is available to allow the barrier to cool
between runs.
Placing a hot thermal barrier directly onto a cold surface may cause the barrier’s
case to distort due to the different cooling rates of the surfaces. Place the hot
barrier on a Datapaq barrier stand to give optimum cooling and protection from
distortion. Alternatively, stand the hot barrier on spacers, an insulating fiber
blanket, or refractory material.
Datapaq will not be liable for damage caused by distortion due to incorrect
handling of a barrier while cooling.
Examining the System for Damage
Once cool, examine the thermal barrier, heatsink (if used) and thermocouples
for damage.
Check the barrier’s seals and closing mechanism, and rectify any damage
before further use. Some sealing catches are designed to be set easily by hand,
and may require some adjustment after the first four or five runs.
Examine the heatsink’s thermometer strip. If the temperature has exceeded
77°C/171°F allow the heatsink to cool to around 15°C/60°F and then place it in
a freezer at -20°C/-5°F overnight; this ensures the phase-change material
crystallizes. After freezing, allow the heatsink to return to room temperature. If
the thermometer strip has recorded a temperature greater than 77°C/171°F,
peel it off and replace it.
If the heatsink phase-change material leaks, contact Datapaq. It is a non-
toxic wax-like substance that dries hard powdery white and has a slight acidic
smell. Wait until it is dry before scraping off any material that has leaked onto
the surface of the barrier.
Store the thermal barrier in a dry environment to prevent its insulation from
absorbing any water (see p. 29).
Examine the thermocouple cables, and replace any found to have damaged
insulation.
56 Running a Temperature Profile OVEN TRACKER XL2
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