Communications: electrical – Condition responsive indicating system
Patent
1980-01-25
1983-08-16
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
340501, 340584, 340588, 340589, 340599, 340636, 340661, 236 78B, 236 94, 62126, 165 26, G08B 2300, G08B 2100, F25B 4900, G05D 2324
Patent
active
043994288
ABSTRACT:
A thermostat monitoring and controlling the temperature of produce ripening within an enclosure and featuring a bridge circuit sensing errors between the actual and desired temperatures in which the desired temperature is selected directly in units of degrees. A bridge amplifier having feedback maintains the bridge in electrical balance to avoid errors due to changes in bridge component self heating. An error detection circuit having a single control simultaneously selects upper and lower error limits centered on the desired temperature, in units of degrees. The circuit indicates whenever the actual temperature goes outside these limits. An alarm circuit indicates a temperature error or a power failure in the thermostat at the thermostat and at a remote location. This circuit utilizes an alternating current source which activates current direction-dependent indicators operating on alternate half cycles. Electrical isolation of the temperature monitoring circuitry from the circuitry controlling heating, cooling and fan equipments is provided by coupling a signal indicating a temperature error through a single electrically isolating interface to equipment selection and control circuitry at line potential.
REFERENCES:
patent: 3616846 (1971-11-01), Wills
patent: 3636540 (1972-01-01), Harris
patent: 3815815 (1974-06-01), Sapir
patent: 3918636 (1975-11-01), Dawson
patent: 3940686 (1976-02-01), Tanaka et al.
patent: 3942718 (1976-03-01), Palmieri
patent: 4240097 (1980-12-01), Hughes et al.
Campbell John E.
Hughes Paul R.
Crosland Donnie L.
United Brands Company
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