Our key-switch (included with Zonecheck V) comes pre-wired to the flow-switch and to the monitored valve. Once the sprinkler pipework is charged with water and power is connected to the key-switch both the flow-switch and monitored valve can be commissioned, with signals on the key-switch showing correct function. Electrical engineers can then take an additional fire signal from the flow-switch and an additional fault signal from the monitored valve onwards to a centralised alarm system at a later date.