WATER_LEVEL_CONTROL

Published:2009/7/7 3:14:00 Author:May | From:SeekIC

Two thermistors operating in self-heating mode are mounted on sides of water tank. Thermistors change resistance when water level rises so liquid rather than air conducts heat away. Threshold adjustment pots are set so RCA CA3098 programmable Schmitt trigger turns on pump motor when water level rises above thermistor mounted near upper edge of tank, to remove water from tank and prevent overflow. Motor stays on to pump water out of tank until water level drops below location of lower thermistor inside tank.- Linear Integrated Circuit and MOS/ FET's, RCA Solid State Division, Somerville, NJ, 1977, p 218-221.



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