Elkhart Brass Scorpion RF 8394-07 - Manual (Page 5)

5
SYSTEM COMPONENTS
MONITOR
Scorpion RF Monitors – 8294-06 & 8394-07
The 8294-06 and 8294-06 EXT is a cast aluminum monitor with 4”
waterway while the 8394-07 is cast brass. The waterway contains a
central vane to minimize large-scale turbulence and provide superior
fire streams. Monitor water supply connection is a 4 inch 150 lb. ANSI
pattern flange. The discharge nozzle connection is 3½” National Hose
thread. Nozzle stream direction is controlled by two permanent magnet
type planetary gear motors, one controlling rotation about the axis of
the water inlet, and the other controlling nozzle elevation and
depression. Right angle gear cases between the gear motor and the
monitor allow for convenient manual override of the electric motors in
the event of a power failure during firefighting operations. All gearing
is enclosed within the monitor housings.
Scorpion RF Monitor – 8294-06 EXT
The extended travel Scorpion has the same highly efficient waterway
and flow capacity as the Scorpion RF monitor. The monitor waterway is
supplied through a 4” 150# flat faced flange base. The 8294-06 EXT
monitor has a mechanical stop to allow 180° for added protection in an
aerial application.
The extended travel Scorpion RF has special features to
optimize performance as an aerial master stream
device when used on a straight aerial ladder with
pinnable waterway. The pinnable waterway feature
allows the waterway to be pinned to the second fly
section of the ladder (egress position), thus keeping the
monitor and nozzle away from the end fly section when
it is necessary to place the ladder tip at a window sill or
roof parapet.
The 8294-06 EXT contains a special wiring harness connection at the inlet flange to allow attachment
of an OEM provided proximity sensor. The proximity sensor is used to tell the monitor controller which
positions the waterway and monitor is. As a result, the monitor discharge Up-Down travel range differs
for the two waterway and monitor positions as indicated in Table 1.
Waterway/Monitor Position Up-Down Travel Range
Master Stream +30° to -135°
Egress +0° to -135°
Table 1: EXT Travel Ranges
The 0° position is when the nozzle is aimed parallel to the ladder.
As a further enhancement, the left-right motor direction of rotation automatically reverses when the
monitor discharge is in the range of 0° to +30°. Without this feature, when the discharge travels
above 0°, “left” would functionally become “right” and vice versa.