K-Patents PR-33-AC - Manual (Page 42)

36 PR-33-AC instruction manual
Document/Revision No. Rev. 1.02 Effective: June, 2014
4. The light source is faulty. When the sensor is removed from the process, the yellow
flashing light can be seen through the prism.
Note: The light is only visible at an oblique angle. Also check the LED value on
the Diagnostics page (section 5.3); if the value is clearly below 100, LED fault is not
likely.
5. There are negative spikes in the optical image. The probable cause is dust or fin-
gerprints on the CCD window. Please contact K-Patents.
6. The CCD card in the sensor is faulty. Please contact K-Patents.
8.2.3 Message PRISM COATED
Cause: The optical surface of the prism is coated by the process medium or impurities
in the process medium.
Action: Remove sensor from line and clean prism manually.
If the problem is recurrent, consider improving the flow conditions (see Section 3.1,
“Choosing the refractometer mounting location”).
8.2.4 Message LOW IMAGE QUALITY
Cause: The most likely cause for this message is coating on the prism. There still is a
optical image available, but the measurement quality may not be optimal.
Action: Clean the prism, see Section 8.2.3 above.
8.2.5 Message NO SAMPLE
The operation of the equipment is OK but there is no process liquid on the prism. In
some cases this message may also be caused by coating on the prism.
8.2.6 Message TEMP MEASUREMENT FAULT
Indicates faulty temperature element. Please contact K-Patents.
Note: A difference to some other process temperature measurement is not a fault.
The Sanitary OEM Refractometer shows the true temperature of the prism surface.