12
ba15356e03
09/2014
Technical data
CN 500 / CN 800
Page 1: ...OPERATING MANUAL ba15356e03 09 2014 CN 500 DIN CN 500 BNC CN 800 DIN CN 800 BNC CYANIDE SENSITIVE ELECTRODE ...
Page 2: ... of the present operating manual can be found on the Inter net under www WTW com It is also available in other languages Copyright 2014 WTW GmbH Reprinting even as excerpts is only allowed with the explicit written authorization of WTW GmbH Printed in Germany ...
Page 3: ...iew 1 Connection head with connection cable 2 Shaft 3 Membrane 4 Knurled nut 5 O ring 6 Filling opening for bridge electrolyte 7 Inner junctions 8 Ground junction 9 Storage vessel for CN 800 10 Protective cap for CN 500 CN 800 CN 500 7 9 7 8 4 6 5 3 2 1 10 ...
Page 4: ...electrode is re quired e g R 503 The two electrodes together form a double rod combina tion electrode 1 Remove the storage vessel 2 Fill the bridge electrolyte ELY BR 503 into the filling opening 3 Shortly press the shaft of the combination electrode against the con nection head to wet the ground junction with bridge electrolyte 4 When doing so refill any spilled bridge electrolyte so that the inn...
Page 5: ...rode is sufficiently conditioned when the measured value no longer changes considerably under otherwise constant conditions temperature composition of the solution NOTE Avoid measuring samples with cyanide concentrations of more than Minimum depth of im mersion The ground junction 4 must be covered Maximum depth of im mersion Approx 1 cm below the fluid level 2 of the bridge electrolyte 1 2 3 4 CN...
Page 6: ...uring It provides a constant ionic strength and similar diffusion potentials at the reference electrode in standard solution and test sample If you would like to have more detailed information concerning sample prep aration and measuring procedures WTW provides a large number of appli cation reports for various applications Response times The response time depends on the concentration range It is ...
Page 7: ...nse times of the electrode perform the fol lowing activities Polish the membrane surface using an SF K polishing strip see section RECOMMENDED ACCESSORIES To do so moisten a polishing strip with deionized water and with circular movements polish the membrane surface for approx 30 seconds Then recondition the electrode see section CONDITIONING CALIBRATION MEASUREMENT Clean the inside of the combina...
Page 8: ...rode in a dry place CN 800 Remove the bridge electrolyte then rinse the combination electrode with deionized water and dab it dry with a clean paper towel Store the combi nation electrode in the storage vessel in a dry place For the following measurement prepare the combination electrode as described in section COMMISSIONING Store the reference electrode according to the instructions in its operat...
Page 9: ...ve electrode ba15356e03 09 2014 9 Calibration line of a cyanide sensitive electrode 10 fache Konzentrationsänderung Meßkettenspannung 10 fold concentration change Electromotive force 1 0 1 10 100 1000 58 mV mg l CN 10 10 10 10 10 mol l CN 10 5 6 3 2 1 4 ...
Page 10: ... for some hours until the crusts have dissolved Ground junction contaminated CN 800 Rinse ground junction with bridge electrolyte Cable broken Exchange the electrode Cause Remedy Membrane surface contaminated Polish the membrane surface with polishing strip S FK see MAINTENANCE Conditioning time too short Extend conditioning time Standard solutions too old Use new standard solutions Inner junction...
Page 11: ...ug or BNC plug depending on design 0 2 260 mg l CN recommended 0 2 25 mg l CN 8 x 10 6 1 x 10 2 mol l CN recommended 8 x 10 6 1 x 10 3 mol l CN 2 0 14 Before measuring adjust the pH value of the sample to pH 10 to 14 0 80 C shortly up to 100 C 30 M CN 500 170 mm including 50 mm connection head CN 800 153 mm including 33 mm connection head Shaft 12 mm Connection head 16 mm 1 m ...
Page 12: ...12 ba15356e03 09 2014 Technical data CN 500 CN 800 ...
