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Summary of Contents for wtw Oxi ML 41
- Page 1 Operating manual Oxi ML 41 D. O. sensor ba75727e01 10/2007...
- Page 2 The latest version of the present operating manual can be found on the Internet under www.WTW.com. Copyright © Weilheim 2007, WTW GmbH Reprinting - even as excerpts - is only allowed with the explicit written authorization of WTW GmbH, Weilheim.
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Page 3: Table Of Contents
Oxi ML 41 Contents Contents Overview ............................4 Safety............................4 Installation and commissioning ....................6 Calibration............................7 Measurement ..........................7 Maintenance..........................8 General information ......................8 Exchange of electrolyte solution and membrane head, regeneration of the cathode.....8 Regeneration of the anode ....................11 Replacement parts and accessories ..................11 Technical data..........................12... -
Page 4: Overview
The operating manual must always be available within the vicinity of the sensor. Target group and user The D. O. sensor Oxi ML 41 was developed for online measurement. Some qualification maintenance activities, e.g. changing the electrolyte solution, require the safe handling of chemicals. - Page 5 Oxi ML 41 Safety Authorized use Authorized use of the D. O. sensor Oxi ML 41 consists exclusively of the measurement of dissolved oxygen (D. O.) in drinking water, swimming pool water and process water. The technical specifications as given in chapter T...
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Page 6: Installation And Commissioning
Installation and commissioning The D. O. sensor Oxi ML 41 is delivered ready to measure, in a storage vessel filled with some water. The sensor can be taken out of the vessel after loosening the coupling ring. Before putting the sensor into operation, carefully dab off the liquid film on the membrane with a lint-free paper towel. -
Page 7: Calibration
Oxi ML 41 Calibration Calibration During calibration, the amplification of the meter is individually adjusted to the sensitivity of the sensor. Calibration can be carried out with air, with air-saturated water, with calibration gases or measuring media with a known oxygen concentration. To do so, please observe the operating manuals of the meters. -
Page 8: Maintenance
Oxi ML 41 Maintenance Maintenance General information Maintenance is required if either the membrane head is defective or the sensor cannot be calibrated or the polarization time considerably exceeds the specified value. Maintenance activities are: cleaning the membrane, possibly exchanging the electrolyte solution, exchanging the membrane head and cleaning the electrode system. - Page 9 Oxi ML 41 Maintenance 4. Carefully wipe the silver/silver chloride anode with a paper towel. Generally, this step is sufficient. The anode is normally covered with a silver chloride layer colored brownish or purple. Do not in any case remove this coating. After long-term use, changes can occur at the anode causing malfunctions of the sensor.
- Page 10 Oxi ML 41 Maintenance • Position the sensor vertically on the polishing strip while exerting slight pressure on it, similar to writing with a pencil. Then draw it over the polishing strip several times in a straight line while exerting slight pressure. Repeat the process moving the sensor in a direction vertical to the previous one.
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Page 11: Regeneration Of The Anode
9. After this treatment, the sensor may be ready to measure only after several hours. Replacement parts and accessories Here you find the recommended accessories and replacement parts that you can order from WTW. If for any reason technical assistance is needed regarding this instrument please do not hesitate to contact the WTW technical services department. -
Page 12: Technical Data
Oxi ML 41 Technical data Technical data 12 mm Measuring principle Membrane-covered, amperometric sensor (Clark cell) Application range Swimming pool water, drinking water and process water Measuring range 0 ... 20 mg/L O 0 ... 200 % air saturation Temperature sensor... -
Page 13: Table: Oxygen Saturation Concentration
Oxi ML 41 Table: Oxygen saturation concentration Table: Oxygen saturation concentration Oxygen saturation concentration (in mg/L) of water in equilibrium with air at a total pressure of the water vapor- saturated atmosphere of 1013 mbar in dependency of the temperature. - Page 14 Wissenschaftlich-Technische Werkstätten GmbH Dr.-Karl-Slevogt-Straße 1 D-82362 Weilheim Germany Tel: +49 (0) 881 183-0 +49 (0) 881 183-100 Fax: +49 (0) 881 183-420 E-Mail: Info@WTW.com Internet: http://www.WTW.com...