| 摘要 |
<p>An electronic controller for an electrode boiler in which the heating current passing through an electrode depends upon the water level in the boiler, in which circuitry controls feed and drain valves to carry out an automatic repetitive cycle to feed water into the boiler to a predetermined level, to sense when boiling has reduced the level to another predetermined point, to open the drain valve to allow a quantity of water to drain out to remove solid matter precipitated during boiling, then to re-open the feed valve to restore the original level so that boiling may recommence. An alternative feed, boil, feed, drain cycle is provided.</p> |
