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Service Manual
Third edition, June 1997
• TX ID switch on is checked when the button on the
Service Display is pressed or when positions 4 and 30
on WT500 on the transmitter has been jumpered.
• Corr plug inval is checked when the trim and list cor-
rection of the ullage cannot be done or when the calcu-
lation produces erroneous results. This holds true for
the Corr cog inval as well. This could be caused by
totally incorrect distances from the TankRadar Refer-
ence point to the tank’s reference point (center of grav-
ity or separate ullage plug).
• TX active is checked when the LCM board requests the
transmitter to measure. However, this checkbox does
not automatically mean that the transmitter is working.
• Searching. The transmitter has lost the echo but is
searching for it.
• TX com timeout. A temporary break in the communica-
tion with the transmitter. Does not cause an alarm. The
box can be checked for a short while. However if it
remains for some time, the TX sens fail status will go
on resulting in an alarm.
• TX test fail. The LCM tests each transmitter regularly.
The transmitter sends a known frequency equalling a
certain ullage. The LCM calculates the ullage from the
test frequency and compares with the expected ullage.
If this box is checked there is also an alarm.
Note: If the TX failure is checked but the TX comfail is not,
try exchanging the Electronic Box.
• Clean Antenna. If the strength of the tank signal is
slowly weakened over a long period of time, the Clean
Antenna box is checked. The effect of both trim and list
on the strength of the tank signal are taken into account.
Note: The Clean Antenna warning may come up if the cargo
has extremely low reflectivity, such as certain chemical prod-
ucts.
A few of the database registers are shown in the window.
These registers can be changed and saved.
The tank distances displayed in the database box are ex-
plained in the Installation Manual, found in the "As-built
drawings and user's manual"-binder. The beam distances can
be used when there are disturbing objects in the tank. If
required, these distances are set by a service engineer when
the TankRadar system is commissioned. These beam dis-
tances should normally not be changed once the system has
been commissioned.