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Water flow alarm system.
Air is compressible so when water pressure goes up due to city water pressure changes water does flow into the system.
Some leak detectors also monitor for changes in acoustics.
An alarm and a red light alert you when water levels rise too high.
A water flow detector commonly produced by system sensor is an electro mechanical device designed to send an alarm to a fire alarm panel and or fire department when a continuous flow of water occurs through the fire sprinkler system s piping from an activated sprinkler head or leak in the system.
Alarm has a plastic housing that meets nema 3r for protection from dirt falling liquids and light splashing.
A float detects water level and activates the alarm.
Unless there s some way of removing air when a building s fire sprinkler system is worked on the air stays in the system.
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Why are there waterflow alarms when no water is flowing.