Troubleshooting guide

86
Reference Manual
00809-0100-4308, Rev BA
Section 6: Service and Troubleshooting
December 2014
Service and Troubleshooting
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, do the following:
1. Read the Echo Curve:
a. Start the Echo Curve reading, refer to “Reading the Echo Curve” on page 83.
b. View the Echo Curve plot and check the relation between amplitude threshold and
corresponding signal amplitude peak.
2. Adjust the Threshold:
a. From the Home Screen, go to Service Tools > Echo Tuning > Thresholds.
b. Under Threshold Control, select User Defined.
c. If using Field Communicator, click Send. The Threshold values can now be
changed.
d. Select desired Threshold to adjust, type the new value into the box and then click
Send. See also “Guidelines for setting the Surface Threshold” on page 85.
Restore default thresholds
Do the following:
1. From the Home Screen, go to Service Tools > Echo Tuning > Thresholds.
2. Under Threshold Control, select Default (Automatic) and then click 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 Figure 6-4, 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.