Abstract
Three alarm systems, one warning of temperatures above and below the acceptable range for blood preservation, the other two designed to prevent temperature rises due to unclosed refrigerator doors and power supply failure, are described and diagrammed. The temperature alarm gives its audible and visual signal in a constantly manned, distant area, identifies the refrigerator which failed, automatically signals the restoration of proper temperature after repairs, and is independent of building electric power supply. The door alarm is automatically turned on and off so it is operating only when the blood bank staff is absent. The power supply interruption alarm anticipates a temperature rise due to power failure by as much as an hour. The installation cost $160.
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