Emerson Process Management 5300 manual Probe End Projection, As product Surface Distance, m

Rosemount 5300 Series

Reference Manual

00809-0100-4530, Rev BA July 2009

Figure 7-3. Example 2: surface threshold is too low.

Amplitude, mV

Disturbing
echo	Actual surface
misinterpreted
as product
surface

3.0 5.0

Distance, m

Surface Threshold=

Amplitude Threshold

Curve (ATC)

Reference Threshold

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

Amplitude, mV

After Surface Threshold is adjusted, the product surface is correctly detected

Surface Threshold=

Amplitude Threshold

Curve (ATC)

Reference Threshold

3.05.0

Distance, m

Probe End Projection

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 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.

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