Ι
-3
ROTARY GEAR PUMP
ELECTRONIC FOAM PROPORTIONING SYSTEM
Section
ΙΙΙΙΙ
: Description
SYSTEM DESCRIPTION
button while the system is operating. The
control unit display also warns the operator
when errors or abnormal operations occur
in the system.
Foam concentrate injection rate is
controlled by an Intel
®
computer chip in the
control unit for accurate, repeatable,
reliable foam concentrate injection. A
water flowsensor constantly monitors water
flow through the discharge piping. The
information from the flowsensor is provided
to the control unit by a shielded cable.
When the Hale FoamMaster system is
activated at the control unit a signal is sent
from the control unit through the shielded
control cable to the distribution box to
begin foam concentrate injection. The
distribution box then provides power to the
electric motor. As the motor rotates the
pump, foam concentrate flows through the
foam pump discharge to the one piece
check valve/injector fitting into the water
discharge stream.
A feedback sensor in the foam pump body
measures foam concentrate flow. The
water flow rate and foam concentrate flow
rate are constantly compared by the
computer chip in the control unit. The
motor speed is constantly adjusted to
maintain the operator selected foam
concentrate injection rate. Since the
system is flow based, injection rate remains
constant regardless of changes in system
pressure or the number of discharges open.
There are three models of Hale FoamMaster
systems covered by this manual. The Hale
FoamMaster Model 3.0, Model 3.3 and
Model 5.0. The maximum rated foam
concentrate flow in gallons per minute is
denoted by the model number. Table 1
shows system capacities at various foam
concentrate injection rates for the different
Hale FoamMaster Models.
Hale FoamMaster foam proportioning
systems are completely engineered, factory
matched foam proportioning systems that
provide reliable, consistent foam
concentrate injection for Class A and Class
B foam operations. Hale FoamMaster
systems accurately deliver from 0.1% to
10.0% foam concentrate through a check
valve/injector fitting directly into the water
discharge stream. It is then fed as foam
solution into a standard fog nozzle, an air
aspirated nozzle, or CAFS equipment,
through the apparatus discharge piping. A
properly configured and installed Hale
FoamMaster system with Hale
recommended components virtually
eliminates contamination of the booster
tank, fire pump and relief valve with foam
concentrate.
The heart of the Hale FoamMaster system is
an electric motor driven rotary gear pump.
The pump is constructed of bronze and
stainless steel and is compatible with almost
all foam concentrates. The pump is close
coupled to the electric motor thereby
eliminating maintenance of an oil filled
gearbox. An internal relief valve,
constructed of stainless steel, protects the
foam pump and foam concentrate
discharge hoses from overpressurization
and damage.
The control unit, mounted on the operator
panel, is the single control point for the Hale
FoamMaster system. Depressing the
ON
button starts foam concentrate injection. A
super brite digital LED display shows the
water flow rate, total water flowed, foam
concentrate injection percentage and
total foam concentrate used depending on
the display mode selected. A bargraph on
the control unit provides indication of the
approximate system capacity being used.
Adjustment of foam concentrate injection
rate can be accomplished by pushing a
