3. Place an empty sample tube in the freezing chamber. Run the Head
Up/Down Test for a few minutes to pump the heat transfer fluid
remaining in the system out into the heat transfer fluid container.
Remove, cap and retain the heat transfer fluid container.
4. Tape or tie a small plastic bag over the ends of the heat transfer fluid
plastic tubes and fluid filter to retain any leakage. Lower the operat-
ing head into the empty sample tube in the freezing chamber to pro-
tect the probe during shipment.
5. Carefully pack and send everything except supply items.
Be sure to prepay for any shipment to the factory. Advanced Instruments
cannot accept collect shipments without prior factory approval. Please
insure the shipment, or accept the damage risk.
Routine maintenance
Daily. Checks you should perform to keep your instrument in peak con-
dition are:
1. Calibration Repeatability: Readings each day on separate aliquots
of the same standards should not deviate beyond the repeatability
and drift limits indicated in Appendix B.
2. Heat-transfer fluid: Heat-transfer fluid will evaporate from the
well and droplets will cling to the sample tubes as they are
removed. Check the contents of the heat transfer fluid reservoir
occasionally; replace the bottle when the level drops below the
“REPLACE” line on the bottle.
NOTE Always discard the old bottle and fluid and replace with a new
bottle due to moisture and bacteria that may be present.
CAUTION The heat transfer liquid contains hazardous chemicals.
Consult the material safety data sheet (MSDS) and use
appropriate personal protective equipment.
Advanced
®
Cryoscope Model 4250 User’s Guide
46
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