A Computerized, Multiple-chamber Controlled Freezing System

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  • 1 Associate Professor. To whom reprint requests should be addressed, Department of Plant, Soil, and Entomological Sciences, University of Idaho Sandpoint R&E Center, 2105 N. Boyer, Sandpoint, ID 83864.
  • 2 Farm Operations Manager, Department of Plant, Soil, and Entomological Sciences, University of Idaho Sandpoint R&E Center, 2105 N. Boyer, Sandpoint, ID 83864.
  • 3 Extension Associate, Department of Plant, Soil, and Entomological Sciences, University of Idaho Sandpoint R&E Center, 2105 N. Boyer, Sandpoint, ID 83864.

An inexpensive controlled freezing system that allows the temperature regime of eight modular sample chambers to be varied independently was constructed. A microcomputer-based data acquisition and control unit controls the freeze-thaw cycle in each of the chambers, as well as recording sample temperatures at desired time intervals. The computer also controls the freeze-thaw cycles in, and records data from, two differential thermal analysis units and records data from an electrical conductivity meter.

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