Humidifier controller having multiple-phase electrode current sensor
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United States of America Patent
Stats
-
Sep 8, 1987
Grant Date -
N/A
app pub date -
Mar 21, 1986
filing date -
Mar 21, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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