Watts HF scientific 28052, Owner'S And User'S Manual, Page: 56 / 67

Catalog No. 29290 49
Rev 3 06/2020
5.5 Patented Ultrasonic Cleaning 1
This feature is used to continuously clean the flow through the cuvette. It
is not intended to clean cuvettes that are already dirty or replace manual
cleaning entirely. See section 5.7 for instructions on cuvette cleaning.
The system will increase the time between cleanings dramatically. Please
note that the system requires the use of a special cuvette which is
included with the instrument. This cuvette must be used for the system to
operate correctly.
The system works by sending an ultrasonic frequency through spring
connections into a piezo transducer bonded to the bottom of a flow-
through cuvette (refer to figure 10).
The system can detect that an incorrect cuvette is installed, an error has
occurred in the transducer or the transducer is not making contact with the
spring connections. This error is indicated by CLN being posted to the
lower screen. Since this is an error condition, this may affect the 4-20 mA
and alarms depending on the setting of the ERLV (4-20 mA) and if an
alarm is set up to Error.
If the correct cuvette is installed, and the error is still posted, try rotating
the flow through assembly slightly to improve the connection to the
ultrasonic transducer. If this fails to work, the cuvette may have to be
replaced (Catalog #24166S). The detection for this cuvette only operates
in AUTO mode. If the system is operating correctly AUTO will flash on the
display.
The connection can be improved with the use of a small film of an
anti-oxidant compound such as OX-GARD ™ made by GB Electrical
Inc. This product is available in the electrical section at most
hardware stores.
5.6 Condensation on Cuvette
The Vapor Purge system prevents moisture, due to condensation, from
occurring inside the instrument. To ensure proper performance, the
desiccant and seals must be maintained in good condition. If these are
distorted or worn they need to be replaced.
Once the flow through is removed from the instrument, it is possible to
have condensate form on the cuvette. It is not desirable to bring additional
moisture into the instrument as this will lower the desiccant life. For this
reason, any condensate should be wiped from the cuvette before
reinstalling the flow through unit.
1 U.S. Patent No. 7,808,642