John Justin Bell
Nursing at 133 St, Oklahoma City, OK

4502287, Mar 5, 1985

Jul 18, 1983

6/514943

Harold L. Hare - Duncan OK
John M. Bell - Moore OK

Safe-T-Frezz, Inc. - Duncan OK

F25B 4900

62126

A refrigeration system alarm device includes a temperature monitoring circuit which detects when a temperature within the refrigeration system exceeds a preselectable temperature reference level. The device also includes an alternating current power monitor circuit which detects when any one of a plurality of alternating current power inputs is interrupted. The device also includes a direct current power monitor circuit which includes a battery and a comparator circuit for determining when the voltage of the battery is below a predetermined level. When an excessive temperature is detected or an alternating current power input interruption is detected or the battery voltage is below the predetermined reference level, a visual or audible alarm signal is generated. If an alternating current power input interruption is detected, a control signal generated in response thereto controls a compressor control circuit to prevent a compressor of the refrigeration system from operating during the alternating current power interruption and a predetermined time period thereafter.