Because I don't understand your concept, I don't know the specific content of your question. If you want to ask about the automatic water shut-off valve (that is, the water supply function of the solar water heater will automatically turn off once the water level in the water tank reaches a certain height to ensure that the water tank does not overflow), then this device fits directly into the water tank of the solar water heater and does not need to be monitored. It uses the float principle to close automatically.
The problem of automatic water supply, such as solar water heaters and water tanks, is of concern to everyone. Those who use electronic (electrode) automatic water supply devices will fail due to rapid scaling of the probe surface due to high temperature in the water tank. With the valves ofwater regulation that does not use electricity, even if the adjustment is precise during installation, changes in water temperature, scale formation and tap water pressure in the tank Water will quickly cause changes in the physical parameters of the valve components, easily causing the valve to fail. Errors in opening and closing actions often cause water to fail to fill when the water tank is not full, or continue to fill water silently when the water tank is full, resulting in is difficult for users to detect, resulting in more water. waste.
It seems that there is no reliable way yet, but we can change our thinking to solve this problem. There is something called "two bombs and a core" that is designed specifically to solve this problem.
This “two bombs and a core” hasof a main unit and two probes. When using it, you place the return hose in an empty plastic bucket or tub, then place the probe inside. When the water returns, the host will sound, reminding you to close the valve in time.
Working principle: When two probes are placed in the air, the resistance between the probes is infinite. When two probes touch the liquid in the same container, the resistance between the probes decreases significantly, triggering an alarm on the host.
It's very useful. It costs more than ten yuan and is available on Taobao.
Although this thing cannot automatically close the water supply valve for you, it can remind you when the solar water is returned, which is an economical and reliable solution.