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PR-23 instrucon manual
5.4 Viewing sensor status
Select SENSOR STATUS at the Main menu.
5.4.1 Opcal image
There are two different image detection algorithms in the PR-23. The original image
detection algorithm has been complemented with an advanced IDS (Image Detection
Stabilization) algorithm which compensates for some unwanted noise in the image.
These algorithms differ somewhat in how the image looks like, but the meaning of
different diagnostic values is the same.
With the original image detection algorithm the Optical image graph (See Figure 1.4
for explanation) should look like Figure 5.6, right side. The vertical dotted line indi-
cates the position of the shadow edge. For empty pipe, the optical image looks like
Figure 5.6, left side. The soft key SLOPE leads to a graph (Figure 5.7) showing the slope
(or irst differential) of the optical image graph in Figure 5.6.
Note: In case there is no signal from the sensor, the image ield is crossed over.
Empty pipe Normal condions
Figure 5.6 Typical opcal images without IDS
Figure 5.7 A slope graph without IDS
5.4.2 Opcal image with IDS
For the IDS enabled image detection algorithm the images look like igure 5.8 and the
slope like igure 5.9.
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