Corrective Action - Vaisala K-PATENTS PR-23 Series Instruction Manual

13 Sensor verification
Figure 13.7 Instrument verification page open in a browser
Note: If you need to verify two sensors connected to one DTR, you need to verify one
and then to save or print the certificate, as the results from the verification of the sec-
ond sensor will overwrite the results of the first sensor. Check the sensor serial num-
ber on the certificate to see that you have correct results on screen and reload/refresh
if needed.

13.4 Corrective action

If you get the message
VERIFICATION FAILED
sample holder are absolutely clean and the sample holder sits tightly on the sensor
tip before a standard liquid is applied. Make sure the standard liquids are in good
condition and not past their expiration date. Also, inspect the prism surface, checking
that it is smooth and glossy without any scratches. Then go back to the Verification
step 2 by pressing soft key
You may want to double-check the following, as they are the most common reasons
for a failure of the verification:
– Insufficient cleaning of the prism.
– Too old calibration liquids
– Bad temperature control (changing temperature)
(Figure 13.9), first check that the prism and the
and repeat the whole verification procedure.
REPEAT
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