Emerson 5301HxxxxxxxxxxxxxxZZ Series Reference Manual page 199

Reference Manual
00809-0100-4530
Use the echo curve analyzer with a handheld communicator
Using a handheld communicator that supports the Electronic Device Description
Language (EDDL) with enhancements allows you to view the Echo Curve, create an
Amplitude Threshold Curve (ATC) and specify amplitude thresholds such as the Surface
Threshold, Interface Threshold, and Reference Threshold.
View the echo curve
To view the echo curve:
Procedure
1. Select Service Tools → Echo Tuning → Echo Curve.
2. Use the Hand and Zoom tools to view specific parts of the Echo Curve.
7.9.3 Adjusting thresholds
Measurement with the Rosemount 5300 is based on the fact that the radar signal pulses
are reflected by the product surface and the interface between two liquids. Signal
amplitude thresholds are used to separate the measurement signal from disturbing
echoes and noise.
The transmitter uses certain criteria to decide which type of pulse that is detected. For
example, counting from the top of the tank, the first echo found above the Surface
Threshold is considered as the product surface, as illustrated in
further away from the top, although above the Surface Threshold, are ignored. When the
surface echo is found, the next pulse below the product surface and with a signal strength
above the Interface Threshold, is considered as the Interface.
By default, the device automatically calculates threshold values depending on the
measurement mode, various dielectric constant values and process conditions that you
have configured. The configured Upper Product Dielectric Constant is used for setting the
automatically calculated amplitude thresholds. Normally no other threshold adjustment is
Reference Manual
The echo curve appears on the display:
The drop down list allows you to choose items, such as the different amplitude
thresholds, to be displayed in the plot.
The echo curve plot also shows an ATC if available. See
handheld communicator for further threshold options.
Service and troubleshooting
April 2019
Adjust thresholds using a
Figure 7-12. Other pulses
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