Xylem DO600 Dissolved Oxygen Meter - Manual (Page 7)

DO600 - Version 5.0 8/05 7
BONDED CAP
Clockwise to tighten
Counter-clockwise to loosen
DO Bonded Membrane Cap replacement
Important Note : Do not touch the membrane as skin oils will interfere with the oxygen
permeability rate of the membrane. Use caution when replacing the bonded cap.
1. It is recommended that the electrode remain attached to the meter during this
replacement process.
2. To remove the bonded cap from the electrode, unscrew the cap firmly and carefully
counter-clockwise from the electrode (see diagram below).
3. Discard the used cap. Please Note: The installation of a bonded cap causes the
membrane to be tightly streched over the cathode. Once a bonded cap is removed
reinstallation is not possible as the membrane will no longer be properly streched over the
cathode.
4. Rinse the old electrolyte solution from the Cathode and Anode before continuing.
5. Use the supplied Polishing Strips to clean, polish, shine, and/or remove scratches from
the cathode. Be sure to moisten the cloth before polishing the cathode. Do not over-polish
the sensitive gold cathode.
6. Set the new replacement bonded cap on a flat surface. Leave the cap in this position
throughout the replacement process.
7. Fill the bonded cap with the electrolyte solution up to the bottom of the threads on the
inside of the cap.
8. Tap the side of the bonded cap to help jar free any trapped air bubbles from the
electrolyte solution.
9. Keeping the cap in a fixed position on a flat surface, carefully insert the electrode into the
new bonded cap by first dipping and removing the electrode several times from the cap.
With each dip, push the electrode progressively deeper into the bonded cap. Finally,
screw the electrode slowly onto the bonded cap (clockwise) until fully tightened. The
dipping and removal technique minimizes the introduction of air bubbles into the
electrolyte solution. Air bubbles in the electrolyte can compromise measurements.
10. During the tightening of the bonded cap, excess electrolyte solution will leak out, this is
normal and desireable since it minimizes the introduction of air pockets. Clean off the
excess electrolyte before use.
Cathode
Electrode
Bonded Cap
Anode
Air Vents