Fluid_level_control_system

Published:2009/7/24 4:10:00 Author:Jessie | From:SeekIC

Pig. 14-22 This circuit shows a simple system to control the emptying or filling process of a fluid container. The only transducers or probes involved are stainless-steel screws and hook-up wire (Fig. 14-22B). The fluid is drained by a motor-operated pump, which, in turn, is controlled by relay RY1. When the system is connected, as shown in Fig. 14-22A (for a sump or bilge pump), the pump motor (typically, a 1/4 HP) operates when the fluid level reaches the start probe, and continues until the level reaches the stop level. If the system is to control the filling process, use the circuit of Fig. 14-22C, National Semiconductor Linear Applications Handbook, 1991, p. 1169.



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