Garnet SEELEVEL II 709-LL Manual page 24

metal such as steel, aluminum, copper, or brass can affect the
sender reading if it is closer than about 2 inches from the
face of the sender. If there are metal frame pieces, brackets,
straps, pipes, ducts, etc. close to the sender you may have
to move the sender away from them. Again, trial positioning
using tape is necessary until the problem disappears. Flexible
pieces of metal can be held away from the sender with rubber
wedged between the sender and the metal. If the metal is off
to the side of the sender, or just butting to the edge then it is
usually not a problem, particularly on the right hand side of
the sender.
5. Make sure that metal doors or covers are far enough away
from the sender as well, once everything is closed up the
positioning may change. The symptoms of exposure to large
metal components are usually a non-zero reading when the
tank is empty, or the level appearing to jump suddenly as the
tank is drained or filled.
6. On fresh tanks there is sometimes a potential to not be able
to use all the water in the tank, we suggest you elevate the
fresh sender 1 inch off the tank bottom and position the top
of the sender to allow for vent position (if the vent is on the
side of the tank). This way you should see '0' before the pump
starts to suck air. Some tanks have a sump style draw system,
in this case there is no concern with unusable water, just allow
for the wall thickness when positioning the sender board
(usually ½ - ¾ inch margin from the outer shell). If the sender
is positioned above the vent then the maximum reading may
be less than 100%.
7. We have had a few instances where 120VAC interference has
caused the readings to stall and create a gap; readings would
skip from 50% to 70% and then begin to function again.
The cause was wiring between consoles and senders being
tied too close to entrance boxes for shore power or bundled
with other high AC voltage lines or junction boxes. Be sure
to support all connecting harnesses; do not let the board
support the harness, this will in time cause delamination of
the board from the tank.
8. Always ground the senders and the console to the same
ground circuit. This is very important; RV's can have several
ground circuits with resistance between them.
had instances where 2 consoles are installed with a different
ground for the service bay console and interior console. If you
see different levels from each console on the same tank, then
the ground circuit is not common. Connect both consoles to
the same ground back to the breaker panel ground point.
Page 24
We have
709-LL Manual