Chapter 11 - Troubleshooting Guide - Garnet SeeLeveL Special 809-DM User Manual

CHAPTER 11 - TROUBLESHOOTING GUIDE

T
here are only 4 serviceable components in the gauge: the float,
the sender bar, the interconnecting fiber optic cable, and the
display.
If the float is sunk, the display will read the bottom tank reading
all the time. If the float is partially sunk, the reading may rise and
then fall as the tank is filled. If the float has lost its magnets, the
reading on the display will stay the same as the fluid level changes,
or the reading may appear to stick at one value then suddenly
jump to a much different value.
If the fiber is damaged or the sender bar is dead, the display will
read "no L" on the display. If the light level is poor due to a damaged
or excessively bent fiber, or if the fiber is not fully inserted, or if the
display is not programmed for the same resolution as the sender,
the display will show "bL:xx", where xx is the number of bits being
received. If the fiber optic cable is disconnected from the display,
a flashing red light should be visible from the end of the fiber.
If the display reads erratically, check for water inside the head or
display, and for a poor end cap seal. If no problem can be seen,
the display will require factory servicing.
In addition to the diagnostic tools built into the 817 programmer,
there are two testers available from Garnet to assist in
troubleshooting and testing. The 899 Multi Bar Simulator has
6 optical outputs to simulate all 6 bars at once. The simulated
levels from each bar can be adjusted independently to test display
and alarm operation. The 809DM Serial Port Tester is able to
communicate via the serial port to test serial operation and to
program various parameters in the gauge. In addition, it has alarm
indicators and PTO switches to allow observation and testing of
all alarm functions. Between these two testers every aspect of the
809DM display can be tested.
To test the sender bar:
1. If the sender is flashing, plug a piece of fiber into the sender
optical connector and the other end of the fiber into the black
OPTO input connector on the 817 programmer. The display
shows the number of bits the bar is sending and the optical
power. If the optical power is poor (less than 70), then check
the fiber, if it is good and fully inserted then the bar output is
bad and the bar must be replaced. Ensure that the number of
809-DM Manual
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