A float operated switch in the relay is used to initiate an alarm signal.

继电器内的浮控开关发动报警信号。

youdao

Reed switch; Proximity sensor; Float Sensor; E-bike Brake Switch; Reed Relay; Flow Switch; Tilt Sensor Switch; Vibration Sensor Switch; Centrifugal Force Sensor Switch.

干簧管； 接近开关； 浮球开关； 电动车刹车开关； 干簧继电器； 水流开关； 角度开关； 震动开关； 离心力开关。

youdao

Then, it would pump out the water, float back to the top and relay its data back to the scientists via a satellite network.

BBC: Cyber-sailors to survey oceans