22318.37.01 15.09.05
11
Short circuit Isolators
Each of the beam detectors in this range contains an integral short circuit isolator, which operates between the
IN -ve terminal and the OUT -ve terminal. The isolator operates in conjunction with the control panel when a low
parallel resistance fault of typically 200
Ω
is presented between Loop +ve and Loop -ve.
Short Circuit Isolation Data
(Integral with each detector)
Total loop Resistance for correct operation of
short circuit isolator.
50
Ω
max
Continuous Current allowable through isolators.
700mA (max)
Isolator Resistance in closed state.
0.13
Ω
(max)
Leakage Current into direct short circuit isolator
open.
13mA (max)
Parallel Fault Resistance to be seen at the
Control Panel for isolators to open
200
Ω
(typ)
12. Service / Application Notes.
•
For full compliance with BS5839 part 5, use 25% and 35%(default) thresholds. The threshold of 50% is
recommended for hostile and extreme environments.
•
Red LED (constant or flashing) will indicate FIRE.
•
Faults will NOT be signalled via the local amber LED of the beam detector. The fire panel will indicate that
the beam detector is in fault and the fault type.
13. Parts List.
•
1 off: Detector Head Assembly
•
1 off: Prism for the MAB50R
•
4 off: Prisms for the MAB100R
•
1 off: Dual Test Filter
•
1 off, 4 way Connector for in line wiring
•
1 off, 4 way Connector for right angle wiring
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