Fire water flow indicator. It mainly plays the role of detecting and indicating the alarm area in the automatic sprinkler system. The fire water flow indicator is mainly installed on the horizontal main pipe of the automatic sprinkler system in layers or zones, and the water flow indicator of the floor or zone is programmed together with the fire control center according to the address code. Once a fire breaks out in a room in a certain area or a certain floor, the sprinkler will start spraying water. When the system water passes through the indicator, the contact circuit in the indicator is connected, and the console shows that there is a fire in the place controlled by the area (or floor) and gives an alarm. At the same time, the main spray pump is automatically turned on for continuous water supply and fire extinguishing.