Troubleshooting guide

85
Reference Manual
00809-0100-4308, Rev BA
Section 6: Service and Troubleshooting
December 2014
Service and Troubleshooting
Guidelines for setting the Surface Threshold
Before changing the Surface Threshold, make sure the product level is at least 20 in. (0.5 m)
from the lower side of the device flange.
 Set the Surface Threshold to about 1/3 of the weakest surface echo amplitude in the
measuring range.
 Surface Thresholds should never be set to values less than 4 Cnts.
 Make sure to include a 3 Cnts margin between the Surface Threshold and the surface
echo amplitude over the entire measuring range.
 The Surface Threshold should be at least 3 Cnts greater than the amplitude of
disturbances.
Contact Emerson Process Management Service Department if the transmitter is still having
difficulties to track the product surface after applying the guidelines.
AMPLITUDE
DISTANCE
Surface Threshold
Surface echo
About 1/3 of surface
echo amplitude
AMPLITUDE
DISTANCE
Surface Threshold
Surface echo
At least 3 Cnts margin
AMPLITUDE
DISTANCE
Surface Threshold
At least 3 Cnts margin
Disturbance
Surface echo