Automatic boiler level controller
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Dec 23, 2003
Grant Date -
Aug 15, 2002
app pub date -
Jun 29, 2001
filing date -
Jun 30, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved boiler water-level controller. According to one aspect of the present invention, a positive blowdown signal is presented to indicate to the operator that the alarm probe is in steam; performing blowdown until this indicator turns on helps ensure that the alarm probe is working properly. According to another aspect of the present invention, the controller uses a novel methodology of sensing water level using conductivity probes. An embodiment of this methodology uses the charging and discharging of a capacitor through a resistive value to sense the presence of water.
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