Emerson Rosemount 3300 Series Reference Manual page 56

Rosemount 3300 Series
4-4
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 6: Disturbances at the Top of the Tank for
further information.
4 mA point
The 4 mA point should be set above the Lower Dead Zone (see Section 2:
Dead Zones). If the 4 mA point is set to a point within the Dead Zone or below
the probe end, the full range of the analog output is not used.
20 mA point
Make sure that the 20 mA point is below the Upper Null Zone.
The 20 mA point should be set below the Upper Dead Zone (see "Dead
Zones" on page 2-7). If the 20 mA point is set to a point within the Dead Zone
the full range of the analog output is not used.
Probe angle
If the transmitter is not mounted vertically, the angle from the vertical position
must be given.
Reference Manual
00809-0100-4811, Rev CA
February 2006