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Liquid Level Control
Pre-assembled module utilizes two included liquid sensors to provide control intended for "fill" or "drain" of a water tank. "Fill" mode energizes the relay when the lower sensor does not detect the presence of a liquid. The relay de-energizes when the top sensor then detects liquid. "Drain" mode energizes the relay when the top sensor detects the presence of liquid, and de-energizes when the lower sensor no longer detects liquid.