Importance

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Abstract

The freeze dryer device of the invention furnishes automatic operational, power outage and defrost control providing for an operator to perform other productive activities during operation of the freeze drying device. Upon initiation by the user, the operational control conditions the freeze drying device to receive bottles of frozen sample product to be freeze dried. Upon the drying device becoming properly conditioned in temperature and pressure, the device of the invention provides the user an indication to apply the sample bottles to the device. The power outage control protects the integrity of the samples applied to the drying device by sensing both temperature and pressure before returning to normal operation. If either temperature or pressure are above certain values after the power outage, the device of the invention stops normal operation by opening manifold chamber to atmospheric pressure while maintaining the refrigeration system operating. This protects the sample product from boiling up into the manifold while in a liquid state. The defrost control senses the absence or presence of ice on the condenser at the end of a defrost cycle. An absence of ice on the condenser causes the device to exit the defrosting cycle while presence of ice causes the device to reexecute the defrost cycle.

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First Claim