Float switch according to the required water level changes, automatic control of pump start and stop, do not need special care.

浮球开关可以根据所需的水位变化，自动控制泵的启动与停止，不需专人看管。

youdao

The principle and application of the thermal diffusion liquid level switch in water disposal system are introduced; moreover, its virtues are analyzed.

介绍了水处理系统中热扩散式液位开关的原理及应用，分析了热扩散式液位开关的优点。

youdao

When the water level drops, the main valve is composed of a floating ball switch control to open the water inlet to the water tank, automatic replenishment.

当水位下降后，主阀由浮球开关控制打开进水口向水池汪水，实现自动补水。

youdao

We saw a number of Electric Imp demos and appliance ideas at the booth including a simple hand-held "detonator" toggle switch with LED, seven-segment counter, water level sensor, servo-controlled gauge, RGB light, power socket, Christmas light, power monitor, toy washing machine, 16x16 LED display and receipt printer (the latter two being combined to show the avatars and tweets of anyone mentioning the Electric Imp) -- all Internet aware.

ENGADGET: Hands-on with the Electric Imp at Maker Faire (video)