Troubleshooting guide

87
Reference Manual
00809-0100-4308, Rev BA
Section 6: Service and Troubleshooting
December 2014
Service and Troubleshooting
Figure 6-4. Surface Threshold Is Too High
If there are disturbing objects in the tank, the Surface Threshold must be carefully set to avoid
locking on the wrong amplitude peak. In Figure 6-5, 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.
Figure 6-5. Surface Threshold Is Too Low
100
80
60
-60
40
-40
20
-20
0
100
50
0
150
200
250
Surface Threshold is above
the Product Surface peak
DISTANCE
AMPLITUDE
100
80
60
-60
40
-40
20
-20
0
100
50
0
150
200
250
Actual product surface
Disturbing echo
misinterpreted as
product surface
AMPLITUDE
DISTANCE