A
%
&
'
(
)
A. Amplitude
B. Distance
C. Surface Threshold
D. Surface echo
E. Disturbance
F. At least 3 Cnts margin
Contact your local Emerson representative if the transmitter is still having difficulties to
track the product surface after applying the guidelines.
Guidelines for setting the interface threshold
•
The Interface Threshold should be approximately 50 percent of the interface signal
amplitude.
•
If possible, Interface Threshold should be higher than Surface Threshold.
Adjust thresholds
Prerequisites
Note
Before changing the amplitude thresholds, check that the Upper Product Dielectric
Constant parameter is set as accurately as possible. The Upper Product Dielectric Constant
is used for setting the automatically calculated amplitude thresholds.
Procedure
1. Read the Echo Curve.
a) Start the Echo Curve reading.
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 handheld communicator, select
Send
. The Threshold values can now
be changed.
Service and troubleshooting
Reference Manual
February 2020
00809-0100-4308
122
Rosemount 3308 Series
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 ...