Chapter 2 - System Description - Garnet SEELEVEL II 714 Manual

CHAPTER 2 - SYSTEM DESCRIPTION

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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 (the tank will always read empty), so by monitoring the signal
power the tank can be cleaned before the buildup gets excessive. If
the tank is more than 12 inches tall, two senders can be stacked to
allow measurement of levels up to 24 inches.
The Display: The display continuously shows the levels for the fresh,
grey, and black tanks, outside temperature and battery voltage or
LPG level. The display automatically obtains the level or temperature
information every 10 seconds and updates the display accordingly.
The display receives the information from the three sender panels
via a single two conductor wire. If the wiring is disconnected or cut,
or if the sender panel is damaged, then the display will indicate the
appropriate fault condition.
The outside temperature is measured with a digital temperature
sensor mounted on the outside of the coach. The temperature can
be programmed to read in degrees Celsius or Fahrenheit and is
accurate to within 3 °F (1.5 °C).
With these diagnostic features and the digital nature of the tank level
sensing technology, it is almost impossible for the system to indicate
an incorrect water level, and in the very unlikely event it does occur,
servicing is greatly aided with the diagnostic information.
User operation of the display is described in the next chapter.
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L consists of a display unit that mounts inside the RV,
EVE
714 / 714-P Manual