Abstract

In 1962, the New Haven (Connecticut) Water Company installed a complete supervisory control system. A supervisory control system requires the transmission of a large number of different functions, either intermittently or continuously, in either or both directions. In order for a supervisory control system to be economically feasible, the transmission must be accomplished over a single interconnecting circuit. Of the several methods available, New Haven selected the method of frequency discrimination using audiotone equipment. The supervisory control systems that were installed by the New Haven utility provide for the operation of remote pumping stations and remote system‐regulating valves. In this article, only the control of remote pumping stations is discussed.

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