Electric heating – Heating devices – Combined with diverse-type art device
Patent
1986-03-21
1987-09-08
Paschall, M. H.
Electric heating
Heating devices
Combined with diverse-type art device
219497, 219483, 219485, 361 87, 361 93, 307 24, 307 39, H05B 102
Patent
active
046925910
ABSTRACT:
A controller for controlling an electrode boiler steam humidifier, of the type operable from a source of polyphase alternating current, is provided. A plurality of current loop transformers, coupled to the boiler electrodes, sense the individual currents drawn in each phase of the polyphase alternating current. A plurality of full-wave bridge rectifiers individually couple the secondaries of the current lube transformers to the input of a voltage amplifier such that the output of the amplifier is indicative of the highest of the currents sensed in each phase of the boiler electrode current. When the output of the voltage amplifier exceeds a predetermined threshold, a control effect is produced such that operation of the humidifier is controlled in accordance with the highest of the individual phase currents drawn through each of the boiler electrodes.
REFERENCES:
patent: 3751631 (1973-08-01), Seager et al.
patent: 4036716 (1977-07-01), Hulthe
patent: 4287407 (1981-09-01), Treiber et al.
patent: 4418269 (1983-11-01), Eaton-Williams
Cooley Stephen E.
Jensen Martin J.
Paschall M. H.
Wehr Corporation
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