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Terminal Connections
Power
The blackbox 133 can operate from mains AC and automatically from a DC
power source or battery backup, in the event of power failure, or can be
operated permanently from DC or batteries.
Transducer
The transducer should be installed, and connected, in accordance with the
installation instructions contained in the Transducer User Guide.
The entire range of, standard dB transducers are certified for use in
hazardous areas and different models, for each, are available for use in Zone
1 or Zone 0.
Wire the transducer to the blackbox transducer terminals as detailed below:
Red = Power (Terminal 19)
White = Signal (Terminal 20)
Black = 0 volts (Terminal 18)
Green (screen) = SCR (Terminal 17)
When using 2 core screened extension cable, the Black and Green wires of
the transducer should be connected to the screen of the extension cable and
connected to the 0 volts terminal (Terminal 18).
For Zone 1 applications a transducer certified to Sira 02ATEX5104X is
used, and must be supplied via a 4000A breaking fuse, which is fitted as
standard to the blackbox .
For Zone 0 a transducer certified to Sira 02ATEX2103X is used, which
must be connected to the blackbox via an external Zener barrier.
See transducer label for certification details.
Relay Outputs
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