Honeywell SLG 700 User Manual page 34

Table 5 - Advanced Configuration parameters, cont'd
Key: Plain = Read only Bold = Configurable
Config. Corr. Algorithm
Reference Reflection
Refer. Refle. Width
Refer. Refle. Gain
Refer. Refle. Attenuation
Refer. Refle. Threshold
Prod/Surface Reflection
Prod. Refle. Width
Prod. Refle. Gain
Prod. Refle. Attenuation
Prod. Refle. Threshold
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Bold underline = Method
Correlation Algorithm
The correlation algorithm searches the full echo curve looking for reflection
shapes that match (that is, correlate highly with) models for reference, surface,
and interface. Each reflection model is a waveform whose shape is defined by
parameters such as gain, width, and amplitude. 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.
If the observed echo curve not correctly indicating reference, surface or
interface then try the following.
1. Step through the basic configuration and make sure that all entries are
correct.
2. Review the Probe Parameters under Advanced Configuration and make
sure that all entries are correct. (Accurate basic and advanced
configuration settings help ensure accurately defined reflection models.)
3. Capture an echo curve.
4. If needed, adjust the radar pulse reflection model parameters for the
Reference, Surface, and Interface (if applicable) to match the radar pulse
reflections in the echo curve.
If the transmitter is not finding the Reference point then adjust the Reference
parameters to match what is seen on the observed echo at the Reference
point location. For example, suppose by zooming in on the observed echo
curve at the Reference point position user can see the observed Reference
Pulse greatest amplitude is -13000 and its width is 180mm at the x axis;
whereas the configured Reference Gain is -15000 and configured Reference
Width is 200mm. This means user needs to change the configured Gain to -
13000 and configured Width to 180mm to match the observed curve.
Determines the width of the Reference Pulse where it crosses the x axis (one
half wavelength).
Amplitude (height) of the Reference Pulse wave shape.
The attenuation parameter governs how fast the sine wave dies off. Increased
attenuation results in smaller side lobes.
If changing the gain does not help try increasing threshold.
If the transmitter is not detecting the Product/Surface level then adjust the
Product/Surface reflection model parameters to match what is seen on the
observed echo at the Surface point location. For example, suppose by
zooming in on the observed echo curve at the Surface point position the
observed Surface wave's greatest amplitude is 9000 and its observed greatest
width is 150mm at the x axis; whereas the configured Surface Gain is 7500
and configured Surface Width is 140mm. This means user needs to change
the configured Gain to 9000 and configured Width to 150mm to match the
observed curve.
Determines the width of the Surface wave where it crosses the x axis (one half
wavelength).
Amplitude of the Product/Surface Peak wave shape.
Increased attenuation results in smaller side lobes of the wave's shape.
Increased attenuation results in smaller side lobes of the wave's shape.
If changing the gain does not help try increasing threshold.
SLG 700 Series HART Option User's Manual
Bold italic = Table or graph
Revision 5