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CHAPTER 2 - SYSTEM DESCRIPTION
T
he SeeLeveL consists of a display unit that mounts inside the
RV, and sender panels that stick to the side of the holding tank.
A single two conductor wire is used to connect all the sender
panels to the display.
The Sender: Each sender panel is a flexible self-adhesive printed
circuit board which is adhered to the side of the holding tank.
The sender panel can be cut to length to match the height of the
tank, and it auto calibrates itself so that it can read from Empty
to Full regardless of the height of the tank. The sender scans
the water level through the tank wall using advanced digital
techniques programmed into the sender microprocessor. When
the sender transmits the water or sewer level information to the
display, it sends a digital code that has built in error detection,
making it highly unlikely for the display to read an incorrect level,
even if the wiring is marginal. In addition to the level, the sender
also transmits diagnostic information about its operation. This
information can be used to determine if there is buildup of sludge
on the inside of the tank, or to determine if the sender is damaged
or delaminating from the side of the tank. If sludge buildup in the
tank becomes extreme the gauge will cease to operate properly,
so by monitoring the signal power the tank can be cleaned before
the buildup gets excessive. For tanks less than 7 inches tall, 50%
better accuracy is achieved by using the JS sender, which can be
shortened for a minimum of 4 inches. For tanks from 7 inches
to 13 inches tall, a single ES sender is used. For tanks from 13
inches to 25 inches tall, two ES senders can be stacked to allow
measurement of levels up to 24 inches.
The Display: The display receives the information from the three
sender panels via a single two conductor wire, and displays the
level information in percent of full on a three digit LED display.
When the front panel button for a particular tank is pressed, the
display powers up and displays the level for that tank. If the button
is pressed and released, the display will show the level for about
5 seconds and then shut down automatically. If another button
is pressed before the display shuts down, then the new level will
immediately be shown. If the same button is pressed twice, the
display will hold on that tank and continue to show updated levels
for 5 minutes before shutting off. This allows the user to monitor
the filling or draining of a tank. By pressing two buttons at once,
the diagnostic functions can be accessed; these are described in
detail in the troubleshooting chapter.
Page 4
709-LL Manual
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