Xylem OxiTopIS OC100 - Manual (Page 6)

Introduction Introduction
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The OxiTop ® Control system provides a further development of the mercury-free,
measured value storing OxiTop ® BOD measurement system. The instrument provides
a multitude of new technological features that simplify the whole process of the BOD
determination for the user. Furthermore, the instrument is almost unlimited with
respect to its sample capacity and use. It can also be expanded flexibly to fulfill its
tasks. In addition to its application in the water economy, the OxiTop
® Control with its
”respirometric” measuring principle can also be used in other areas such as
• Evaluation of biological degradability, i.e. testing aerobic degradation
(e.g. test according to OECD 301F)
• Evaluation of respiration and toxicity in earth, sludge, waste and sediment (e.g.
extraction of earth contaminated according to recovery concepts)
• Evaluation of the respiration rate of cell cultures
• Microbiological growth and stress examinations
In addition, in conjunction with the enhanced OxiTop ® Controller OC110 and relevant
accessories, the OxiTop ® -C measuring heads can also be used to
• Measure anaerobic degradation processes (e.g. biogas evaluation)
The measuring principle
The sample bottles are filled according to the data visible in the display (BOD
measuring range with assigned water sample amount). The microorganisms draw
oxygen to degrade organic substances from the amount of air remaining in the closed
system. The carbon dioxide formed by this process is absorbed. Due to the reduction
in the amount of oxygen, the pressure in the bottle sinks. This change is detected and
stored by the measuring head. After the data transfer to the controller, it is used to
determine the BOD value.
Further information is given in the WTW BOD handbook.
The OxiTop ® Control measuring system
The 6 or 12 position OxiTop
® Control systems are configured for BOD determination
and consist of the OC100 OxiTop ® controller, the OxiTop ® -C measuring heads, the
inductive stirring system and various accessories.
The measured value determination and storage of the measurement data is
performed in the measuring head. This data is transmitted via ”infrared to the
controller” without the need for wires and then calculated to the BOD value. The user
can start his individual measuring program and printout the calculated data via the
TD100 IR printer or further process it via a PC program using the ”Routine BOD” and
”Standard BOD” operating modes described in detail in this operating manual. The
user interface appears in one of 5 selectable languages. An overview of the entire
sample management together with the status and function response is shown on the
display. With the aid of the display function, sample identification is no longer
required. Via the OxiTop
® -C IS 6/12 expansion sets, the system can be extended up
to 144 measuring positions.
An overview of the essential advantages
• DIN procedure
• Modular extensions
• Mercury-free • Data storage
• Precise • Comfortable handling
• Automatic sample management
• Automatic measurement report • Wireless data transfer,
(even through glass or transparent
plastic)