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ba75383e04

04/2009

ConOx

Operating manual

Combined Conductivity and Dissolved Oxygen Sensor

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Summary of Contents for ConOx

Page 1: ...ba75383e04 04 2009 ConOx Operating manual Combined Conductivity and Dissolved Oxygen Sensor ...

Page 2: ...ConOx ba75383e04 04 2009 26 Copyright Weilheim 2009 WTW GmbH Reprinting even as excerpts is only allowed with the explicit written authorization of WTW GmbH Weilheim Printed in Germany ...

Page 3: ...ement 35 5 1 General maintenance instructions 35 5 2 Outside cleaning 35 5 3 DO module Changing the electrolyte solution and membrane cap 36 5 4 DO module Cleaning the electrodes 38 5 5 Checking the DO module for freedom from zero current 40 5 6 Aging of the conductivity measuring cell 40 5 7 Disposal 41 6 What to do if 42 6 1 Error symptoms of DO measurement 42 6 2 Error symptoms of conductivity ...

Page 4: ... to the galvanic measur ing principle Structure of the ConOx 1 Voltage electrode inside 2x 2 Current electrode ring 2x 3 Temperature sensor in a graphite enclosure 4 Shaft 5 Connection head 6 WP 90 membrane cap filled with electrolyte solution 7 Gold working electrode cathode 8 Insulator 9 Lead counter electrode anode 10 Screw thread base with ventilation area 11 Cap nut 12 Plug connection 13 Clos...

Page 5: ... application z On site measurements in rivers lakes and wastewater z fishfarming z Ground water measurements z Applications in water laboratories 1 2 Instrument identification A series number is printed on both ConOx modules Keep these numbers ready if you have questions to ask the WTW service department The series numbers contain the following information Conductivity basic module The number is p...

Page 6: ...id slight injuries or damage to the instrument or the environment 3 Commissioning 3 1 Scopes of delivery 3 1 1 Scope of delivery of the ConOx z ConOx combination conductivity and DO sensor DO module filled with electrolyte solution and ready to use z 1 closing cap for conductivity basic module z 1 closing cap for DO module z 3 exchange membrane caps WP 90 z Calibration and storage vessel OxiCal CX...

Page 7: ...module z 1 exchange membrane cap WP 90 z Polishing strip SF 300 z Electrolyte solution ELY G z Cleaning solution RL G z Operating manual for ConOx Note The membrane cap that is mounted on the DO sensor for delivery serves mainly as a transport protection Depending on the duration of the transport and storage period it may have a shortened operational lifetime If the mea suring system cannot be cal...

Page 8: ...nsor Make sure that the DO module and conductivity basic module are screwed together tightly When mounted the cap nut of the DO module has to be screwed on up to the stop Before screwing on the DO module check the following points z The sealing 3 must be clean and evenly positioned in the groove z The plug connection must be dry on both sides Screwing on the DO module Position the DO module 1 on t...

Page 9: ...pth with the closing cap or D O module screwed on important the temperature sensor must be submersed The minimum immersion depths are given in chapter 7 TECHNICAL DATA Note Please read the course of the calibration in the operating manual of the mea suring instrument 4 2 Measuring Please always observe the required minimum immersion depth and the minimum approach flow that is important for DO meas...

Page 10: ...l at a temperature of 0 50 C 32 122 F Make sure that the sponge in the calibration and storage vessel is always moist Calibration and storage vessel OxiCal CX Moisten the sponge z Remove the cap 1 z Take out the sponge 2 wet it then slightly squeeze it out z Reinsert the sponge and close the calibration and storage vessel with the cap 1 2 ...

Page 11: ...ith the eyes rinse thoroughly with water and consult a doctor z Note the safety datasheets CAUTION Before all maintenance activities disconnect the sensor from the instrument Note Information on how to order wear parts and maintenance means can be found in chapter 8 WEAR PARTS AND ACCESSORIES Maintenance activities on the DO module For better handling leave the DO module screwed on the conductivit...

Page 12: ...vily contaminated z the membrane is damaged z the electrolyte solution is exhausted Changing the electrolyte solution and membrane cap Unscrew the membrane cap Caution Electrolyte solution For disposal of the membrane cap and electrolyte solution see section 5 7 Rinse the sensor head with deionized water Carefully rub and dry the counter electrode with a lint free paper towel Immerse the sensor he...

Page 13: ...g a paper tow el Excess electrolyte solution is forced out of the ventilation area Check the filling Inspect the face surface No air bubbles may be present within the dashed circle Air bubbles outside this area do not interfere Note For measurements under high pressure the filling must be com pletely free of air bubbles Readiness to measure The DO module is ready for operation after approx 30 to 5...

Page 14: ...embrane cap Caution Electrolyte solution For disposal of the membrane cap and electrolyte solution see section 5 7 Rinse the sensor head with deionized water Using the rough side of the wet SF 300 polishing strip polish off any contamination from the gold working elec trode using light pressure Caution Do not use any con ventional sandpaper or glass fiber brushes Rinse the sensor head with deioniz...

Page 15: ...e mem brane cap Additionally you can prevent air bubbles by throwing the first filling away and refilling the membrane cap Rinse the sensor head with electrolyte solution Hold the sensor inclined and screw on the membrane cap fingertight using a paper tow el Excess electrolyte solution is forced out of the ventilation area Check the filling Inspect the face surface No air bubbles may be present wi...

Page 16: ...ium sulfite solution for more than 2 minutes Danger of sensor poisoning Test criterion The DO module is OK if the measuring instrument displays 1 DO saturation after 2 minutes 5 6 Aging of the conductivity measuring cell Normally the conductivity measuring cell does not age Special measuring media e g strong acids and lyes organic solvents or too high temperatures shorten the operational lifetime ...

Page 17: ...ater and immediately change contaminated clothing z If it comes into contact with the eyes rinse thoroughly with water and consult a doctor z Follow the safety datasheet Conductivity basic module DO module and membrane cap For disposal unscrew the membrane cap from the DO module Then rinse the entire sensor and the membrane cap with water We recommend to dispose of the conductivity basic module an...

Page 18: ...odes see section 5 4 Screw membrane cap tighter Incorrect temperature display The temperature sensor of the conductivity basic module was not immersed deep enough in the measuring solution Temperature sensor defective Observe the minimum immersion depth Return the sensor Mechanical damage to the sensor Return the sensor Error symptom Cause Remedy No temperature or con ductivity display No connecti...

Page 19: ...dule with 1 5 m cable Materials Shaft Epoxy Connection head POM Closing cap PVC Plug connection for DO module PEEK Conductivity electrodes Graphite Thermistor enclosure Graphite Connection cable Lengths 1 5 3 6 10 15 20 m Diameter 6 mm Smallest allowed bend radius Fixed installation 50 mm Flexible use 80 mm Plug type Socket 8 pins Connector for DO module Plug type 3 pole watertight plug connection...

Page 20: ... cm with closing cap min 8 cm with DO module max 20 m depending on the cable length Operating position any Approach flow not required Storage conditions Recommended storing method in the OxiCal CX calibration and storage vessel moistened or dry without DO mod ule Storage temperature 0 50 C 32 122 F Characteristic data on delivery Temperature responding behavior t99 99 of the final value display af...

Page 21: ...nt directive Measurement conditions Measuring ranges at 20 C 68 F 0 50 mg l DO 0 600 DO saturation 0 1250 mbar DO partial pressure Polarization time min 30 50 min after changing the electrolyte it is not necessary to connect the sensor to the measuring instrument for polarization Temperature range 0 50 C 32 122 F Max allowed overpres sure 3 x 105 Pa 3 bar Depth of immersion with conductivity basic...

Page 22: ...ue display after 60 s Own consumption of oxygen at 20 C 68 F 0 008 μg h 1 mg l 1 Drift approx 3 per month in the operating condi tion Working life min 6 months with one electrolyte filling 4 2 5 3 8 6 1 7 NTC 30 kΩ Voltage electrode 2 Current electrode 1 Voltage electrode 1 Counter electrode Working electrode NTC NTC Current electrode 2 Conductivity basic module DO module Shield Shield wire Plug f...

Page 23: ...mprising 1 closing cap for conductivity basic module 1 closing cap for DO module O ring grease for the sealings of the closing caps Sponge lid for OxiCal CX Sealing for plug connection ACC CX 401 080 Accessories Description Model Order no Calibration and storage vessel OxiCal CX 205 400 Magnetic stirrer Oxi Stirrer 300 203 810 Stirring accessory provides a constant de fined flow of the sensor in c...

Page 24: ...Wear parts and accessories ConOx 48 ba75383e04 04 2009 ...

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