ΙΙ
-37
ROTARY GEAR PUMP
ELECTRONIC FOAM PROPORTIONING SYSTEM
Section
ΙΙ
ΙΙΙΙ
ΙΙ
ΙΙ
: Installation
foam concentrate should be present for
one minute of operation at rated flow.
2. Coat the threads of the low tank sensor
with suitable sealant and insert into tank
fitting. Tighten sensor making sure the float
is on the top of the sensor.
3. After installation, check operation of the
side mount low tank level sensor with a
powered test light. With no foam in the
tank, the light should be on. If light does not
illuminate, rotate the side mount low tank
level sensor until the test light is on.
BOTTOM MOUNT LOW LEVEL SENSOR
INSTALLATION
1. The bottom mount foam tank low level
sensor must be mounted into the bottom of
the foam tank. The sensor, as supplied, is
threaded into a bushing that has 1 inch NPT
threads. The sensor is designed to be
installed from the outside of the foam tank
through a bulkhead fitting or boss with 1
inch FNPT threads. Mount the sensor in the
bottom of the foam tank in an upright
position. Use suitable sealant to prevent
concentrate leakage.
NOTE:
There must be sufficient space
under the foam tank for the low tank
level sensor wires to be routed to the
foam pump/motor assembly. Be sure
not to remove the float from the shaft on
the low tank level sensor assembly. If the
float is installed in the reverse position,
“
lo A” or “lo b” will appear on the
control unit and the system will
automatically shut down even if there is
foam in the tank.
2. Check low tank level sensor operation
with a powered test light. With no foam in
the tank, the light should be on. If this is not
the case, remove the clip from the end of
the sensor. Remove float and reinstall 180
o
out of position. Reinstall clip.
TOP MOUNT LOW LEVEL SENSOR
INSTALLATION
A top mount low level sensor assembly is
available for installations where the sides or
bottom of the foam tank are not accessible
or sensor service is required without draining
the foam tank. The sensor assembly is
flange mounted in an access hole at the
top of the foam tank. The two section
telescoping assembly permits adjustment of
low tank level sensor position for various
foam tank depths from 31-½ to 60 inches
(800 to 1524 mm). Flange cutout
dimensions are shown in figure 2-39. The
flange gasket can also be used as a
template to mark hole location.
a. Using dimensions in figure 2-29, layout
and drill holes in the top of the foam
tank. The center of the sensor should be
located at least 1-½ to 2 inches (38 to 51
mm) from the sides of the foam tank.
NOTE:
The minimum depth of foam tank
for installation of the top mount sensor
without cutting the tube sections is 31-½
inches (800 mm). If the tank depth is less
than 31-½ inches (800 mm) cut the
tubing as described in step c.
b. Determine the approximate length of
the top mount low tank sensor extension
by measuring from the top of the foam
tank at the flange opening to the
Figure 2-28. Side Mount Foam Tank Low
Level Sensor Installation
1-½ to 2 in.
(38 to 51 mm)
BULKHEAD
FITTING
LOW TANK
LEVEL SENSOR
ASSEMBLY
BOTTOM OF FOAM TANK
FLOAT POSITION
(INSUFFICIENT FOAM
CONCENTRATE IN TANK)
FLOAT POSITION
(SUFFICIENT FOAM
CONCENTRATE IN TANK)
