d) Select desired Threshold to adjust, type the new value into the box, and then
select
Send
.
Related information
Read the echo curve
Guidelines for setting the amplitude thresholds
Restore default thresholds
Procedure
1. Select
Service Tools
→
Echo Tuning
→
Thresholds
.
2. Under
Threshold Control
, select
Default (Automatic)
, and then select
Send
.
Example 1: Product surface peak not found
If the transmitter does not track the product surface correctly, it may be necessary to
adjust the threshold values. In
, the Surface Threshold is too high and as a result
the product level will not be detected. In a situation like this, the Surface Threshold has to
be lowered so that the surface peak is not filtered out.
Figure 6-3: Surface Threshold Is Too High
A. Amplitude
B. Distance
C. Surface Threshold is above the Product Surface peak.
If there are disturbing objects in the tank, the Surface Threshold must be carefully set to
avoid locking on the wrong amplitude peak. In
, the Surface Threshold is too
low, and as a result the transmitter has locked on a peak above the actual product surface.
A disturbance was interpreted as the product surface, since this was the first amplitude
peak closest to device that went above Surface Threshold. The actual product surface was
interpreted as the interface or the probe end.
Reference Manual
Service and troubleshooting
00809-0100-4308
February 2020
Reference Manual
123
Summary of Contents for Rosemount 3308A
Page 8: ...Contents Reference Manual February 2020 00809 0100 4308 viii Rosemount 3308 Series ...
Page 10: ...Introduction Reference Manual February 2020 00809 0100 4308 10 Rosemount 3308 Series ...
Page 22: ...Transmitter overview Reference Manual February 2020 00809 0100 4308 22 Rosemount 3308 Series ...
Page 74: ...Installation Reference Manual February 2020 00809 0100 4308 74 Rosemount 3308 Series ...
Page 96: ...Configuration Reference Manual February 2020 00809 0100 4308 96 Rosemount 3308 Series ...