Emerson Process Management ROSEMOUNT 5300 Instrukcja Użytkownika Pobierz pdf (Strona 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

Amplitude, 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

Amplitude, mV

Distance, m

Reference Threshold

Surface Threshold=

Amplitude Threshold

Curve (ATC)

1 2 ... 131 132 133 134 135 136 137 138 139 140 141 ... 323 324

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