FL 128 Multizone System 15.01.2021 9
Principle of Operation
The Floodline system works from the principle that water, or other conductive liquid must touch one or more
of the sensors for an alarm to be activated. (Any liquid will activate the OIL Sensor).
The system essentially detects differences in loop resistance on each of its zone inputs. The leak detection and
system fault alarms are activated when the loop resistance falls between, below or above set limits as detailed
below.
• 0 to 1k Short circuit causing SYSTEM FAULT alarm
• 1k to 300k * Water detection casing LEAK alarm
• 300k* to 4M:- SAFE - no alarm,
• above 4M Open circuit causing SYSTEM FAULT alarm
*Or less according to sensitivity setting - see later.
The system will not be activated by humidity alone but condensation dripping on to the detection cable due to
the humidity may activate a leak alarm depending on type of sensor used and amount of condensation present.
If the system is wetted, for whatever reason, the alarm will be activated. If the system is likely to be
installed in an area, or in conditions where minor, occasional drips might occur and are to be ignored
then care should be given to the routing and position of the sensors to minimise any apparently
“spurious” or unwanted alarms.
Floodline 128 Control System
The standard Floodline 128-leak alarm system is available in 32, 64, 96 or 128 zone configurations. The control
system consists of a base unit and a control unit.
Base Unit
Introduction
The base unit houses the main control board (motherboard), the battery backed power supply, the 32-zone
leak detection modules (1 to 4), the individual zone output relays (if fitted) and the communication module (if
fitted). All wiring from the leak detection sensors and onward communications wiring is brought to the base
unit which can be houses at a suitable location i.e. riser.
The base unit is an isolated, stand-alone unit and requiring a 220/240VAC 50Hz mains power supply and is
complete with integral sealed lead-acid battery back-up. A range of warning and status indicators are mounted
on the front of the base unit to show Power On, “Display Disconnected” and “Display Comms Failed”.
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