A series of mechanical backup systems for electronic environmental controllers is presented for a typical finishing swine barn and a typical tunnel ventilated broiler house. The systems consist of mechanical thermostats and timers used in parallel with the electronic controller, designed to ensure animal survival in the event of controller or related hardware failure. For swine housing, three distinct mechanical backup functions are identified; for broiler housing, four distinct mechanical backup functions are identified. Schematic diagrams of the mechanical backup functions are provided and their implementation is described.

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Published in Applied Engineering in Agriculture, v. 8, issue 4, p. 491-497.

© 1992 American Society of Agricultural Engineers

The copyright holder has granted the permission for posting the article here.

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The investigation reported in this paper (No. 91-2-95) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with the approval of the Director.