The water flow indicator is an integral part of the automatic sprinkler fire extinguishing system, and is generally installed at the water distribution main pipe or the beginning of the water distribution pipe on the side of the system pipe network. When the blade senses the water flow signal, it will convert the water flow signal into an electrical signal. After the automatic alarm controller receives the signal, it will issue an instruction to start the alarm system or start the fire pump and other electrical equipment, and can display the fire occurrence area. This product is suitable for For wet, dry and pre-action sprinkler systems.