Emerson Rosemount 3308 Series Reference Manual page 220

Configuration parameters
February 2020
Probe end threshold
Threshold to filter out noise in the echo curve for detection of the Probe End peak. The
probe end peak is a fairly strong positive or negative echo (depending on probe type) that
is present at the probe end when tank is empty.
Near zone threshold
Threshold control
The Near Zone Threshold can be automatically calculated by device or manually set by
user.
Threshold
Threshold to filter out noise in a zone near the device. Noise below the threshold is
suppressed. This threshold replaces the Surface threshold in the zone where it is
applicable.
Distance
Distance from Upper Reference Point (normally the lower side of device flange) to point
where the near zone threshold ends.
Near zone trimming
Trim Near Zone
Select to activate trimming.
The Trim Near Zone method is used to fine tune performance in the area close to the tank
top. This function is normally not used. Trim Near Zone is typically used if there are
problems related to the nozzle.
Near zone has been trimmed
Indicates if the Trim Near Zone method has been used for this device.
Related information
Trim Near Zone function
Advanced
Peak detection method
Select which peak detection to use for level measurements.
Table D-6: Peak Detection Methods
Option
Peak Center
Threshold Intersection
220
Description
Surface detected at the first amplitude peak closest to device
detected above the Surface Threshold.
Surface detected at first intersection with Surface Threshold.
Reference Manual
00809-0100-4308
Rosemount 3308 Series