Viewing Sensor Status; Optical Image; Optical Image With Ids - Vaisala K-PATENTS PR-23 Series Instruction Manual

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PR-23 instruction manual

5.4 Viewing sensor status

Select at the Main menu.
SENSOR STATUS

5.4.1 Optical 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 leads to a graph (Figure 5.7) showing the slope
SLOPE
(or first differential) of the optical image graph in Figure 5.6.
Note: In case there is no signal from the sensor, the image field is crossed over.
Empty pipe Normal conditions
Figure 5.6 Typical optical images without IDS
Figure 5.7 A slope graph without IDS

5.4.2 Optical image with IDS

For the IDS enabled image detection algorithm the images look like figure 5.8 and the
slope like figure 5.9.