Figure 7: Adjusting The Correlation Algorithm - Honeywell SLG 700 Option Manual

3.6.5. How to configure the Correletaion Algorthim (model type)
Under normal circumstances, the transmitter will automatically find the level of the surface and
interface (if applicable) using the configuration that was shipped from the factory:
Step through the basic configuration and make sure that all entries are correct.
1.
Review the Probe Parameters under Advanced Configuration and ensure that all entries are
2.
correct.
Capture an echo curve.
3.
Navigate to the Correlation Algorithm page and load the captured echo curve.
4.
Select the reflection model (Reference, Surface, Interface or End of Probe).
5.
The selected model appears on the upper graph as a brown line to distinguish it from the
6.
blue echo curve.
Click and drag cursor to move model over relevant part of the curve. The example curve
7.
shown in the figure below represents a scenario of a two liquid non-flooded application
with oil on top of water. In the example the transmitter has correctly located the surface of
the upper oil layer, but has failed to find the interface boundary between the oil and water
due to a model miss-match. In this case the Interface model should be selected and
dragged to a location to the right of the Surface reflection where the interface is known to
be.
The closer the model shape matches the curve shape, the lower the Objective Function
8.
value, as shown in the lower right-hand corner below the bottom graph. In the example,
the brown Interface model does not match the blue curve at the selected position (240 cm)
so the Objective Function value is high (greater than 1).
Note: The numbers in red circles in the images refer to the step number.
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Figure 7: Adjusting the Correlation Algorithm

FOUNDATION Fieldbus Option User's Manual Rev.5