ISHS Acta Horticulturae 157: Postharvest Handling of Vegetables
ELECTRONIC MONITORING AND CONTROL OF CARBON DIOXIDE AND OXYGEN IN CONTROLLED ATMOSPHERES (CA) |
| Authors: | E.C. Lougheed, D.J. Bishop, D. Bishop |
| Abstract:
Microprocessor-controlled systems and electronic instruments for measurement of oxygen and carbon dioxide appear to be sufficiently reliable and of a cost that they may be used both for research and industry. The sensitivity is similar or better than that of the Orsat, the precision and accuracy, particularly among different operators much better, and the saving of time considerable. Any such system should be designed and installed to consider fail-safe controls, manual over-ride and servicing of components. A microprocessor-controlled system has been designed and installed for sequentially monitoring 40 chambers using an infrared analyzer for carbon dioxide and a paramagnetic analyzer for oxygen. No control functions have been installed because of the difficulty and cost of installing controllable devices to manipulate the atmospheric composition of small chambers. Such devices could be installed in commercially sized rooms. The system has operated for some 16 months with no major problems. | |
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