A Flow Monitor can be provided "pre-installed" on each FLAMEX Extinguishing Assembly. The Flow Monitor is wired to the FLAMEX Control Panel and indicates a water flowing condition (minimum 3/L per minute) through the extinguishing assembly. This device serves as a leakage indicator by signaling the Control Panel when a flow is detected when the solenoid is not activated. Conversely, the Flow Monitor also gives an indication of a water supply fault if no water is detected flowing through the extinguishing set during an activation.