Reservoir low water level alarm circuit b

Many small hydropower stations have a reservoir on the mountain, and water is diverted from the reservoir to the power station to drive the hydroelectric generator set . There is usually no
one to manage the reservoir, and the on-duty personnel work at the power station . In order to better generate electricity and understand the water level situation, the duty personnel hope to
install a low water level alarm in the duty room of the power station. To this end, you can make a homemade low-water level alarm device for the reservoir, which
will send out an alarm signal when the water level in the reservoir drops to the minimum specified level.