Emerson Rosemount 3308 Reference Manual page 59

Reference Manual
00809-XXXX-4811, Rev AA
February 2012
PRELIMINARY
Upper Null Zone
This parameter should only be changed if there are measurement problems in
the upper part of the tank. Such problems may occur if there are disturbing
objects close to the probe. By setting the Upper Null Zone, the measuring
range is reduced. See Section 7: Disturbances at the Top of the Tank for
further information.
NOTE
Measurements are not performed within the Upper Null Zone.
Probe angle
If the transmitter is not mounted vertically, the angle from the vertical position
must be given.
Rosemount 3308
5-5