Page
15
Terminal Connections
Power
The
blackbox
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.
The AC and DC wiring should be completed using either 16 – 14AWG (1.5–
2.5mm
2
) stranded or 16 – 14AWG (1.5–4mm
2
) solid wire.
An external supply isolator/circuit breaker (AC or DC) must be fitted and
labelled to identify the instrument to which it refers.
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 EEx m (Zone 1)
or EEx ia (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)
If splicing
, it is recommended using a junction box with standard twisted,
shielded pair at 20 AWG.
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).
