Air is compressible so when water pressure goes up due to city water pressure changes water does flow into the system.
Water flow alarm system.
Insteon wireless water leak sensor 2852 222 insteon hub required for smartphone alerts.
A float detects water level and activates the alarm.
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.
Unless there s some way of removing air when a building s fire sprinkler system is worked on the air stays in the system.
Alarm has a plastic housing that meets nema 3r for protection from dirt falling liquids and light splashing.
An alarm and a red light alert you when water levels rise too high.
Some leak detectors also monitor for changes in acoustics.
Home water leak detector systems trigger a water sensor alarm if they detect moisture in a location that should be dry.
A suite of products that work together to protect your home from supply side and drain side sinks toilets etc water damage and leaks 24 7.