Emerson Process Management ROSEMOUNT 5300 - Manual (Page 136)

Reference Manual
00809-0100-4530, Rev BA
July 2009
Rosemount 5300 Series
7-6
Figure 7-3. Example 2: surface
threshold is too low.
By adjusting the surface threshold the product surface is properly detected as
illustrated in Figure 7-4:
Figure 7-4. Echo Curve after
surface threshold was adjusted
To adjust the amplitude thresholds, see “Using the Echo Curve Analyzer” on
page 7-10.
In the Echo Curve Analyzer in RRM, the amplitude thresholds can be easily
dragged to the desired values.
The surface and interface thresholds should be set to about 50% of the
measured signal amplitude of the product surface and the interface peaks,
respectively.
NOTE!
For interface measurements, check that the Upper Dielectric Constant
parameter setting is set to the actual dielectric constant value of the upper
product before changing the amplitude thresholds.
Probe End Projection Probe End Projection allows you to measure product level when the surface
pulse is too weak to be detected. For example, long measuring range and
products with very poor reflectivity (low dielectric constant).
See Appendix C: Advanced Configuration for information on how to use the
Probe End Projection function in Rosemount Radar Master.
3.0 5.0
Actual surface
Disturbing
echo
misinterpreted
as product
surface
Am
plitud
e, mV
Distance, m
Reference Threshold
Surface Threshold=
Amplitude Threshold
Curve (ATC)
3.0 5.0
After Surface Threshold is
adjusted, the product surface is
correctly detected
Am
plitu
d
e, mV
Distance, m
Reference Threshold
Surface Threshold=
Amplitude Threshold
Curve (ATC)