151
Reference Manual
00809-0100-4530, Rev DD
May 2016
7.2
Analyzing the measurement signal
Rosemount Radar Master (RRM) and other tools using enhanced EDDL has powerful
functions for advanced troubleshooting. Using the Echo Curve plot function, an instant
view of the tank signal is shown. Measurement problems can be solved by studying the
position and amplitude of the different pulses.
Note
illustrates the key elements of a theoretical echo curve. In an actual echo curve,
the probe end pulse and the probe end echo threshold line are not visible in an interface
application, they are shown for illustration purposes only.
Figure 7-1. The Echo Curve Function Presents All Visible Echoes
Echo peaks
In a typical measurement situation, the following peaks appear in the echo curve plot:
Reference echo peak
- This peak is caused by the transition between transmitter and the
tank vapor space or air. It is used by the transmitter as a starting reference point for distance
to the level surface. The echo peak amplitude depends on the probe type and installation
geometry.
Product surface echo peak
- This peak indicates the product level and is caused by a
reflection from the product surface. The signal strength of the reflection depends on the
dielectric constant of the product.
Product with a high dielectric constant (for example water) gives better reflection (a strong
signal amplitude) than product with a low dielectric constant (for example oil).
Interface surface echo peak
- This peak indicates the interface level. The peak is caused by
reflection from the interface between an upper product and a bottom product with a
relatively high dielectric constant. This peak is shown when the Measurement Mode is set to
Product Level and Interface Level or Interface Level with submerged probe.
Probe end echo peak
- It is caused by reflection on the probe end. If the probe is grounded,
the peak will be positive.
3.0
4.0
5.0
6.0
Interface Threshold
Surface Threshold
(ATC)
Probe End Threshold
Reference Threshold
Amplit
ude
, mV
Distance, m
Reference
P1 Surface
P2 Interface
Probe End
Содержание 5300 Series
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