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II. S
YSTEM
C
OMPONENT
D
ESCRIPTIONS
A.
RF Monitor
The
RF Monitor is specially designed for use on off-road or wild land fire
fighting apparatus. The
RF is controlled from inside the cab through a wireless
transmitter or by handheld transmitter so risk to firefighters is significantly reduced.
The
RF features durable Elk-O-Lite
®
construction combined with rugged,
stainless steel gears and motors that are completely enclosed and sealed for maximum
protection from the elements. The
RF has a flow efficient 2.0” vaned waterway
to minimize turbulence and provide superior fire streams. Water supply is provided through
the monitor base by 2” National Pipe Thread connection. The discharge nozzle connection is
a 1½” National Hose Thread. Nozzle stream direction is controlled by two permanent
magnet type gear motors, one controlling rotation about the axis of the water inlet, and the
other controlling nozzle elevation and depression.
An optional 2.0” electric valve kit is available to allow the user to control water flow directly
from the
R
F control box. This enables “pump and roll” functionality with
complete control by the operator in the cab of the truck via wireless joystick control. The
electric valve can also be controlled using the optional handheld wireless transmitter.
B. RF Receiver/Control Module
The monitor control circuit uses a state-of-the-art PIC (Programmable Integrated Circuit) chip
design. This device allows numerous control features while keeping circuit board size to a
minimum. Relays within this box provide motor reversing control for the Up/Down, Left/Right,
valve Open/Close and nozzle Straight Stream/Fog functions.
All functions are sent to the RF receiver/control module via an encoded radio frequency link.
The radio link reduces the number of control wires down to just the two power leads,
dramatically simplifying the installation procedure. The link also allows wireless control from
up to ¼ mile away using a battery powered handheld transmitter.
A rotary pulse counter, part of the horizontal motor, provides horizontal motion control
feedback. The counter in combination with the PIC controller enables the monitor to move
between programmable endpoints that are programmed by the user for rotation up to
360°total (+/- 180° from center). This feature also allows the unit to be programmed to
oscillate between positions within the total travel setting. This feature can be programmed
easily with any of the wireless transmitters. No mechanical stops to adjust.
The control circuit also provides secondary motor protection with the use of electronic current
sensing circuitry. If the monitor encounters an obstruction before reaching a pre-set limit,
this circuitry quickly senses motor stall current and automatically shuts off power to the
motor. As soon as the control switch is released, the circuit resets to allow subsequent
operation of the monitor.
