TROUBLESHOOTING GUIDE
FOR PR-23 ALL MODELS
K-PATENTS OY Postal Address: P.O.Box 77, FI-01511 Vantaa, Finland Street Address: Elannontie 5, FI-01510 Vantaa, Finland Tel. int.+358 207 291 570
Fax int.+358 207 291 577 info@kpatents.com www.kpatents.com Vat No. FI03035575 Business ID 0303557-5 Registered in Helsinki
4. Typical Faults and Causes
4.1 Description: Measurement is constantly showing 0 concentration or “flat line” in DCS
Cause(s): Error message on the measurement status, such as No optical image, no sensor, short circuit, no
sample etc. During certain error messages the instrument gives “default” mA-output, this is configured to
give 4 mA as preset.
Solution: Troubleshoot the issue indicated by the error message.
4.2 Description: Measurement Status No optical image, low image quality
Cause(s): The CCD-element does not receive enough light to determine the borderline of reflected light vs
shadow on the optical image. Lack of light in 90 % of the cases is caused by coated or eroded prism. Liquid
leakage through the prism gasket also fits this category. Remaining 10 % of the faults are related to the other
optical or electrical faults, such as broken optical fiber or detached flat cable. Severely bad optical images
are generally seen with these error messages.
Solution: Check the functionality of the washing system with manual washes. If that won’t help, clean the
prism with a glassfiber brush and check the optical image. Also check the prism for scratches or marks. The
prism needs to be replaced, if there are any visible marks on the polished surfaces. Possible leakage can be
detected from abnormal temperature readings and increased head humidity. Services can be done only by
K-Patents or a trained service person.
4.3 Description: Spiking concentration outputs
Cause(s): Coating of the prism or prism erosion causes a low quality optical image and unstable
measurement.
Solution: Clean the prism. If the prism is eroded, service accordingly. If the coating is a constant problem,
consider other installation position or additional washing system. Check the functionality of the washing
system, if there already is installed one.
4.4 Description: No connection to the sensor “No Signal”, “No Sensor” or endless “Starting up..”
status
Cause(s): Weak cable connections, faulty sensor processor card, or electrical component failure due to
excessive humidity or temperature inside the sensor. Another potential cause may be a liquid leakage inside
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