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Cripe, C.R. and B.E. Stokes. 1978. Device to Detect Potentially Dangerous Electrical Currents in Saltwater Holding Tanks. Prog. Fish-Cult. 40(2):74-75. (ERL,GB 335).

The use of 60-HZ, 120-V alternating current in a laboratory with saltwater holding tanks presents a possible hazard to personnel. The breaking of a glass-enclosed water heater or malfunction of a metal heater due to corrosion could result in a lethal shock to a person in contact with the water and a ground. The apparatus described here, costing less than $40 (January 1977), is designed to detect a voltage differential between a container of salt water and a ground. It will activate an alarm, and turn off the current to a heating element relay. The voltage will remain off and the alarm will continue until a reset button is pressed.

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