Emerson Rosemount 3308 Series Reference Manual page 133

Reference Manual
00809-0100-4308
Figure 6-14: Upper Null Zone Is Extended to Block Out Disturbances at the Top of the
Tank
A. Amplitude
B. Distance
C. Upper Null Zone
D. Disturbance
E. Product Surface Peak
Prerequisites
Note
Desired measuring range must be below the Upper Null Zone.
Figure 6-15: Upper Null Zone
A. Upper Reference Point
B. Upper Null Zone
C. Measurement Range
Note
Before changing the Upper Null Zone, check entered limit and deadband values for the
High Level Alerts. High Level Alerts should not be placed in the Upper Null Zone.
Reference Manual
Service and troubleshooting
February 2020
133