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101
Service Manual
Third edition, June 1997
TankRadar
reference
point
TankRadar
reference
point
Center of the
Transmitter
deck socket
555
mm
TankRadar
Reference
Point
Customer's
Gasket.
Approx. 4 mm
Figure 9-1 shows the TankRadar reference point.
9.15 Comparing Ullages
The best reference point for ullage measurement is the ullage
plug on the flange of the transmitter housing if the Parabolic
Antenna is used.
When measuring on the Cone Antenna, the Waveguide Cone
has to be removed. See instructions in chapter 6.3.4. Hand
dip from the top of the edge of the cone. Reduce the hand
dipped measure with 555 mm. The 555 mm includes the
length of the cone and the thickness of the gasket (approxi-
mately 4 mm).
If separate ullage plugs are used for hand dipping and as
reference points, the vertical distances (A-distances) between
the two ullage plugs are stored in the database of the Work
Station and the Level Unit. The ullage displayed by TankRa-
dar is corrected so that it is equal, at even keel, to the ullage
at the separate ullage plug.
Normally TankRadar makes trim/list corrections to the
centre of gravity, C.O.G., at 98% filled tank (C and E dis-
tances refer to C.O.G.). On some ships TankRadar makes trim
and list correction to a separate ullage plug.