K-Patents PR-03 - Manual (Page 63)

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7 Troubleshooting and correcting problems 57
A B C D
Diagnos-
tics
SLOPE
TEST: 115.7
31.2
°C
Max: 208
Slope: 2.7
Endp: 21
L): 10.1
R(: 25.8
Normal operation
Figure 7.3 Slope display
Prism coating can be prevented by good process flow, high process temperature (see Section 2.2) or prism
wash. If your system already has prism wash, the wash interval can be decreased.
Important: The maximum wash times are given in Table 5.1. Do not exceed the recommended wash time,
instead you can try repeating the wash more often.
If prism surface is damaged, for example something in the process has abraded the prism or the wash time
has been long, replace the prism and adjust the prism wash or other conditions so that the prism doesn’t get
damaged.
If prism gaskets leak, replace them and all the sensor parts that have been damaged by the process liquid
inside the sensor (see Chapter 6, “Regular maintenance” for instructions).
7.2.4 Image diagnostics
The last tool in this branch of the selection tree is the Image diagnostics display, available through Cali-
brate / Optical image / Scaled image / Slope / Diagnostics
. If the answer to
all the questions in this screen is Yes (Figure 7.4), the sensor head temperature and humidity are below the
limits and the message is Normal operation, your refractometer system should be in working order.
Note: If the system is offline, some of the image diagnostics questions will get No for an answer even in a
working system (Figure 7.4).
A B C D
IMAGE DIAGNOSTICS
Max intensity OK (above 100)?
Endpoint below 75%?
Image below corner?
Slope OK (above 1)?
Left curve L) OK (above 1)?
Right curve R) OK (above 1)? Yes
Yes
Yes
Yes
Yes
Yes
SENSOR HEAD
Head temperature: 28 °C
Head humidity: 3%
Normal operation.
A B C D A B C D
IMAGE DIAGNOSTICS
Max intensity OK (above 100)?
Endpoint below 75%?
Image below corner?
Slope OK (above 1)?
Left curve L) OK (above 1)?
Right curve R) OK (above 1)? Yes
Yes
No
No
Yes
No
SENSOR HEAD
Head temperature: 28 °C
Head humidity: 3%
Normal operation.
Inline image diagnostics (= process) Offline image diagnostics (= in air)
Figure 7.4 Image diagnostics display