Temperature control system with alarm and shut down for non-trac

Details Temperature control system with alarm and shut down for non-trac Temperature control system with alarm and shut down for non-trac

1980-06-27

1982-03-30

Envall, Jr., Roy N.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219506, 219499, 219509, 128724, 128736, H05B 102

Patent

active

043225942

ABSTRACT:
In a system in which temperature control of a heated region is critical, assurance means of fail-safe nature are provided to guard against improper temperature. An example wherein temperature is critical is: the artificial ventilation of an unconcious patient's lungs by periodically inspired heated gas under pressure. The assurance means includes dual thermometers which sense the actual temperature in the heated region. The actual temperature is compared with the desired temperature to control an electric heater, which, when energized, increase the temperature of the heated region. Furthermore, the temperatures, as sensed by the two thermometers, are compared with each other. If the difference exceeds a predetermined limit, an alarm is given and the heating system is shut down.

REFERENCES:
patent: 3903883 (1975-09-01), Pecina et al.
patent: 3982098 (1976-09-01), Trostles

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