Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1992-05-28
1994-11-22
Paschall, Mark H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219492, 219506, 219505, 219508, 340589, H05B 102
Patent
active
053671465
ABSTRACT:
A method and apparatus for monitoring and limiting the operational temperature of physical and technical equipment includes supplying a heating device with at least one test pulse of energy and the effect of the test pulse on the temperature course of the equipment is compared to a characteristic operating line that is to be monitored. The comparison dictates where further energy can be supplied to the device or whether the energy supply is to be switched off. Such monitoring and control can be carried out periodically, without interrupting the operation of the equipment. The invention can be used to monitor the degree to which a heater is filled with a heat transfer medium; and is also able to detect impermissible heat dissipation levels.
REFERENCES:
patent: 4333004 (1982-06-01), Forgue et al.
patent: 4461951 (1984-07-01), Luoma, II et al.
patent: 4638960 (1987-01-01), Straube et al.
patent: 4695709 (1987-09-01), Sachs et al.
patent: 5075537 (1991-12-01), Lorenzen et al.
patent: 5099108 (1992-03-01), Kimura et al.
Paschall Mark H.
Zehnder Electronic AG
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