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Electronic spill control system automatically
prevents tank overfill by controlling PTO driven
pumps. In cab controller handles up to two
compartments. |
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Companion Instrument to the Garnet SeeLeveL
family of truck level gauges. |
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Provides automated control of PTO pumps for spill
prevention during loading.
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Uses SeeLeveL alarm points to provide a warning horn
and an engine shutdown.
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Bypass feature silences the warning horn and allows
engine restart.
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The bypass is automatically canceled during off
loading to remove the human factor (the operator is
not required to re-arm the system to maintain spill
protection).
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Manual re-arm maintains spill protection for partial
loads.
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Cab mounted modular design monitors up to four
compartments.
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Independent compartment controls maintain spill
protection for remaining compartments after the first
one has been loaded and bypassed.
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Panel indicators display each compartment's load
status.
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The tractor-trailer interconnect plug is monitored to
detect plug swapping, faults, and disconnection.
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The truck and trailer wiring is monitored to detect
open and short circuits.
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Designed for both body trucks and tractor trailer
units.
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Operation from -45 to +60 oC ambient
temperature.
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Easy installation and servicing.
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One year unconditional parts warranty.
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Click to enlarge
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The SpillStop consists of three main components: the
controller in the cab of the truck, the plug module
inside the 7 pin socket housing on the trailer, and
the gauge module inside the SeeLeveL truck gauge.
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The gauge module installs inside the SeeLeveL gauge
display, and converts the alarm signals from alarms 1,
2, and 3 in the gauge to a pulse signal which is sent
along a single wire to the controller.
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The plug module monitors the signal between the gauge
module and the controller and turns on the SpillStop
indicator only if the 7 pin plug is connected and the
signal is getting from the gauge to the controller.
The module is only needed for tractor-trailers
combinations where the signal must go through a plug
and socket, it is not necessary for body trucks.
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The controller monitors and displays the alarm status
of the gauge, and activates a horn if the fluid level
in the truck tank is at the full point, and shuts off
the vehicle engine if a spill is imminent. The
standard controller can accommodate 2 compartments,
and the extended controller can accommodate up to 4
compartments. Each compartment is treated
independently and has its own controls, so full spill
protection is maintained for each compartment even if
another compartment has already been filled.
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The operation of the SpillStop during the loading
operation is as follows: When the tank is empty, the
green TANK EMPTY indicator is on, the horn is off, and
the engine is allowed to run. As the fluid level
rises, the empty indicator goes out. When the horn
alarm point is reached, the yellow HORN ALARM
indicator comes on and the horn is activated with a
0.5 second on, 0.5 second off cycle. Depressing the
horn alarm BYPASS at this point will silence the horn.
If the fluid level continues to rise and reaches the
engine shutdown point, the red ENGINE SHUTDOWN
indicator will come on and the truck engine will be
shut off.
Depressing the engine shutdown BYPASS at this point
will allow the engine to be restarted. When a BYPASS
switch is depressed, the alarm indicator stays on and
the red bypass indicator comes on. As the tank is
unloaded the alarm indicators will go out when the
fluid level drops below the alarm points, and the
bypasses will be cleared (the system is re-armed) when
the TANK EMPTY indicator comes back on. There is no
need for the operator to re-arm the system, removing
the possible operator error of forgetting to re-arm.
If the tank is not filled to the alarm point, the
system can still be bypassed to prevent sloshing from
shutting down the engine during driving. If a single
tank is to be filled from more than one location, the
alarms can be bypassed during driving between loading
sites, and the system re-armed with the MANUAL RE-ARM
switch to re-establish spill protection for the second
load.
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Some of the other safety features of the system are as
follows: When the tank is empty, the bypasses will not
work, preventing accidental bypassing when the driver
is leaving the cab to begin loading. Delays are
incorporated into the system to prevent noise spikes
or momentary bad connections from disrupting
operation. A short circuit in the wiring to the gauge,
or plugging the SpillStop plug into the trailer
lighting socket, lights the red SHORT CIRCUIT
indicator and shuts down the engine. An open circuit
in the wiring to the gauge, or a disconnection of the
plug to the trailer, lights the red UNPLUGGED
indicator, sounds the horn, and shuts down the
engine.
These alarms can be bypassed to allow operating the
tractor without the trailer connected. The pulse
signal between the gauge and the controller cannot be
corrupted by poor wiring connections or moisture in
the wiring; if the signal is too badly degraded it
defaults directly to an open or short circuit
condition. A failure of the SeeLeveL gauge defaults to
the engine shutdown alarm condition. The gauge and
plug modules cannot be damaged by short circuits or by
plugging the trailer light plug into the SpillStop
socket. The controller will operate at truck voltages
from 10 to 16 volts, and allows drops to 8 volts
during starting.
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Installation is straight forward, as indicated by the
drawing. The only wiring required is a single wire
from the socket to each gauge, a standard 7 wire cable
from the tractor to the trailer, 12 volts to the
controller, and controller connections to the electric
horn and engine shutoff. The system draws less than
1/4 amp so it can operate from any convenient circuit.
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