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Service Manual
Third edition, June 1997
Check that the amplitude is within the shaded area according
to figure 6-3. If it is not, exchange with new Electronic Box.
6.3 Cleaning the Antenna
The only regular maintenance required is cleaning of the
transmitter antenna. No general intervals can be stated, as
cleaning intervals depend on the carried cargo. There is an
automatic test function in TankRadar, indicating when an-
tenna cleaning is required. A warning-message, stating
which Transmitter that needs cleaning, is displayed on the
Work Station.
The warning comes up if the reflected signal from the surface
during a period of 5 hours is too weak. Other failure func-
tions override the above indication.
The cleaning of the antennas is carried out differently on the
Parabolic Antenna and the Cone Antenna.
6.3.1 Cleaning the Parabolic Antenna
Follow the steps below when cleaning the Parabolic Antenna:
1. First clean the Teflon on the antenna feeder, following
the ”Brush cleaning” instructions below.
2. Wait half an hour. If there is still the warning-message,
check if the parabolic antenna has any moisture on it. If
it has, clean it according to the instructions in “Cleaning
by Hand” below. Also check if there is something be-
tween the parabolic antenna and the surface of the
liquid. If so remove it.
3. If the warning message is still there after another half
hour, please contact Saab Marine Electronics Service
Department or a service agent for further assistance.
See chapter 12 for a complete list of the service agents.
6.3.2 Brush cleaning the Parabolic Antenna
The cleaning with the cleaning brush can take place while the
tank is in operation and while it is pressurized with inert gas.
1. Remove the cleaning hole plug on the cleaning hatch on
the transmitter socket.
2. Connect the grounding wire of the cleaning brush to the
ullage plug or some other suitable place where a good
grounding is achieved.
3. Push the Teflon adapter into the plug hole. The check
valve on the inside is now opened.
4. Insert the brush to the first mark on the brush shaft.
5. Move the brush between the first and the second marks
on the brush holder.
Figure 6-4. Brush clean-
ing the Parabolic An-
tenna.