Airstream INTERNATIONAL TRAILER Owner's Manual page 117

AIRSTREAM INTERNATIONAL TRAILER OWNERS MANUAL
To review advanced sender diagnostics:
1. The advanced sender diagnostics do not need to be reviewed periodically. They are to provide
assistance in troubleshooting the sender, or to satisfy those who are really curious about the operation of the
sender.
2. The sender consists of a solid transmit section on one side and up to 16 receive segments on the
other side, numbered from 16 at the bottom to 1 at the top. Short senders have receive segments, which are
½" high while tall senders have receive segments, which are 1" high. Each segment will generate a signal
level depending on whether water is present at the level of the segment or not. If water completely covers
the segment, a maximum signal level will be generated. If the water level is well below the segment, a
minimum signal level will be generated. A partial covering with water will generate an in between signal
level. Thus the approximate water level can be determined by observing where the signal level drops
dramatically. If the segment has been cut off to shorten the sender to fit the tank, then a zero signal level
will be generated. To determine the number of receive segments present, take the sender length in inches
and multiply by two, this will give the number of the bottom segment on the sender.
3. The sender will transmit level and diagnostic data for the first 2¼ minutes of operation, and then
will switch to advanced diagnostic operation where it transits the raw received signal level for each receive
segment (each receive segment is called a point in the following description).
4. Follow the directions in the previous section up to step 4a for the sender to be reviewed. For
example, to review the grey water sender press the button during LPG scan and wait until the grey LED is
lit and the display shows one of the five diagnostics for the grey water tank sender.
5. Press the button; while it is held down you will see "Pnt" indicating that the display will proceed
to the point diagnostic function. If you hold the button down longer than about 8 seconds the display will
shut itself off.
6. When the button is released, the display will show "dLY" indicating that there is a delay before
the sender begins to send advanced diagnostic data. This delay is the 2¼ minutes mentioned in item 3. If
the display is not receiving any data from the sender (that is, showing "OPn" or "Sht" during scan) it will
immediately shut off.
7. After the delay, the display will flicker "dLY" quickly indicating that it is receiving advanced
diagnostic data from the sender. This flickering will take about 1 to 2 seconds. If the display continuously
receives corrupted data, or if the sender never changes to sending advanced data, then the display will shut
off after 2½ minutes.
8. When the flickering stops, the signal level, from 0 to 99 percent, of point 16 on the sender is
shown. If the sender is the full length, then this corresponds to the receive segment on the tank bottom. If
the sender has been shortened, then this point does not exist and will show "O".
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