这里再介绍一种采用普通低压电器制作的水位自动控制与水泵故障自停报警器。它具有原件选购容易,线路简单,动作可靠,极便于农村电工自行制作、使用。其工作原理如图所示。它具有水位自动控制、手动控制、水泵不抽水故障自停报警及水泵过载自停报警等多种功能。一、水位自动控制此处采用小型继电器线路、低压电极式水位控制方案。当处低水位状态时,电极1、2未接通,继电器J不吸合,控制电路中的J常闭触点闭合,使交流 Here again introduced a common low-voltage electrical production water level automatic control and pump fault self-stop alarm. It has the original purchase easy, simple lines, reliable action, very convenient for rural electrician to make, use. Its working principle as shown. It has automatic control of water level, manual control, water pump does not pump fault self-stop alarm and pump overload stop alarm and other functions. First, the water level automatic control here using a small relay circuit, low-voltage electrode type water level control program. When the low water level at the state, the electrode 1, 2 is not connected, the relay J does not pull the control circuit J normally closed contacts closed, so that AC