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0 additional features & options, 1 ultrasonic cleaning, 2 rs-485 outputs – HF scientific AccUView Wastewater UV %Transmission Monitor User Manual

Page 30: 1 hf online

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8.0

Additional Features and Options

8.1 Ultrasonic Cleaning
This system is used to continuously clean the flow through cuvette. It is not intended to
clean cuvettes that are already dirty, or replace manual cleaning entirely. The system will
increase the time between cleanings dramatically. Please note that the system requires the
use of a special cuvette. 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.

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, the

alarm will be set and the 4-20 mA will be sent to 2 mA.

If the correct cuvette is installed, and the error is still posted, try rotating the flow through
unit slightly to improve the connection. If this fails to work, the cuvette may have to be
replaced (Catalog #24232S). The detection for this cuvette only operates in

AUTO mode.

If the system is operating correctly

AUTO will flash. The cleaning system can be turned

off. Refer to section 7.10

Ultrasonic Cleaning

After installing a cuvette, there will be a 30 minute period where the lower screen will
post

DRY to the lower screen. During this time, the ultrasonic circuit will not operate to

allow the Vapor Purge system to remove all moisture from the ultrasonic transducer. This
is normal and is not considered an alarm condition so no alarm will be implemented. If the
cuvette is removed during this period no

CLN alarm is posted until the 30 minute DRY

period times out.

Even with the above drying system, it is still recommended that Ultrasonic cuvettes be
dried by hand, including the transducer on the bottom prior to use.

8.2 RS-485 Outputs (19851A)
The AccUView Wastewater has the capability to operate in three different RS-485 modes.
Included is a mode for interfacing into the HF Online software package (section 8.2.1
below), and a simple communication mode. A third operating mode is the Modbus
communications. All modes will automatically configure and do not require any changes
or selections. Factory installed option cat. # 19851A is required for RS-485 operation.

8.2.1 HF Online (HF catalog # 19783)
The AccUView Wastewater can operate as a small SCADA system with an optional PC
software package, called HF ONLINE. This system allows for an interface with up to 255
AccUView Wastewater’s for the purpose of data logging. This system will interface
directly with common database and spreadsheet software.

AccUView Wastewater (1/09)

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Rev. 2.9