The FG-SYS digital unit was available in either a rack or wall mounted version. The rack mounted version remains but the wall mounted unit has undergone something of a revamp. The current FG-SYS wall mounted panel can be found here
The unit is able to control from 1 to 180 lengths of sensing cable independently and autonomously, giving indication of the type of event for each zone along with time and date, the name of the zone and the location in metres from the origin of the leak).
The FG-SYS digital unit was designed to be used with the liquid sensing cables:
Any presence of a liquid contacting the sensing cable activates an alarm and displays the location of the leak to the nearest metre.
TTK FG-SYS Digital unit Data Sheet (2001)
TTK FG-SYS Digital unit Data Sheet (2003)