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Service and Troubleshooting
August 2017
Guidelines for setting the interface threshold
The Interface Threshold should be approximately 50% of the interface signal amplitude.
If possible, Interface Threshold should be higher than Surface Threshold.
Procedure for adjusting thresholds
To adjust the amplitude thresholds:
1. Read the Echo Curve.
a. Start the Echo Curve reading, refer to
b. View the Echo Curve plot and check the relation between amplitude threshold and
corresponding signal amplitude peak.
2. Adjust the Threshold.
a. Select Service Tools > Echo Tuning > Thresholds.
b. Under Threshold Control, select User Defined.
c.
If using Field Communicator, select Send. The Threshold values can now be changed.
d. Select desired Threshold to adjust, type the new value into the box, and then select Send. See
also
Restore default thresholds
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
be detected. In a situation like this, the Surface Threshold has to be lowered so that the surface peak is
not filtered out.
Figure 6-4. Surface Threshold Is Too High
100
80
60
40
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0
-20
-40
-60
A. Surface Threshold is above the Product Surface peak.
96
PRELIMINARY
"Guidelines for setting the surface threshold" on page
Figure
6-4, the Surface Threshold is too high and as a result the product level will not
A
DISTANCE
"Reading the echo curve" on page
95.
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0
Reference Manual
00809-0100-4308, Rev CA
93.
Service and Troubleshooting
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Table of Contents
Troubleshooting
