K-Patents DD-23 - Manual (Page 5)

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1 Introduction
The K-Patents Digital Black Liquor Divert Control System DD-23 provides a divert sig-
nal preventing black liquor with dangerously low solids to reach the black liquor burn-
ers. The system is built strictly according to the principles of Recommended Good
Practice "Safe Firing of Black Liquor in Black Liquor Recovery Boilers" (BLRBAC April
2010; the document is available at
http://www.blrbac.org/Sept2010Updates/Safe_Firing_of_Black_Liquor_April_2010.pdf ).
The system consists of the following parts: Two K-Patents Process refractometers
PR-23-SD (A & B) are installed in series in the main black liquor line. Each refrac-
tometer is complete with a sensor, an Indicating transmitter and interconnecting ca-
bles. Each refractometer provides also two 4–20 mA output signal not used by the
divert control system. These can be used to give % solids output or temperature out-
put signals. The sensors are also equipped with a steam wash nozzles although the
self-cleaning sensor design may eliminate the need for prism wash altogether.
1.1 Warranty
K-Patents warrants that all products made by K-Patents shall be free of defects in ma-
terial and workmanship. K-Patents agrees to either replace or repair free of charge,
any such product or part thereof which shall be returned to the nearest authorized
K-Patents repair facility within two (2) years from the date of delivery.
Before returning a defective product for service or replacement, please contact K-Pa-
tents or your nearest K-Patents representative (see http://www.kpatents.com/ for
contact information). For the health and safety of personnel handling your return,
clean the instrument, especially the parts that have been in contact with the process
liquid, before packing it. Ship the cleaned instrument to the address given to you.
1.2 Disposal
When disposing of an obsolete instrument or any parts of an instrument, please ob-
serve the local and national requirements for the disposal of electrical and electronic
equipment. The aluminium or stainless steel sensor housing can be recycled with
other metallic waste of the same type.