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2. Hold the probe under hot running water and brush away the white oxide on the
cylindrical anode with a stiff plastic brush – do not use metal cleaning material.
3. If the cathode has any deposits, remove them with a light scouring powder. Do
not polish the cathode.
4. Using the installation tool, unscrew and remove the membrane lock from the
membrane cap. See Figure 57 on the following page.
5. Remove the membrane and O-ring. Discard both.
6. Rinse the membrane cap and membrane lock in tap water.
7. Install a new O-ring inside the membrane cap.
8. Install a new membrane. Make sure the membrane covers the O-ring all
around its circumference.
9. Using the installation tool, screw the membrane lock back into the cap. Tighten
the lock firmly over the membrane and O-ring, but do not over tighten.
10. Inspect the membrane for wrinkles. If wrinkles exist,
remove the membrane and repeat steps 8 – 11.
11. Fill the membrane cap with water and inspect the bottom
for leaks. If water drops are leaking from the membrane,
re-seal the membrane on the O-ring (repeat steps 8 – 11,
for membrane replacement only).
If the assembly is leak-free, empty the water and fill the
membrane cap with electrolyte to the brim.
12. Tap the side of the housing gently to remove any air
bubble that may be sticking to the membrane.
13. Screw the cap onto the probe. Excess electrolyte will drain
out.
14. Replace probe guard.
15. Calibrate the probe after the % saturation readings have stabilised.
Note: Membranes can only be used once. When a membrane cap is screwed onto
the probe, the membrane is stretched by the cathode. If the same O-ring and the
membrane is used a second time it will not fit perfectly onto the cathode. This will
result in erratic readings.
1.4.5 Electrolyte Solution
The electrolyte solution in your probe’s cap will deplete on usage and will need to be
replaced periodically.
Your new DO probe comes with accessories of one replacement electrolyte solution
and a spare membrane cap. The replacement electrolyte comes premixed and ready
to use. To order more electrolyte solution, see “Accessories” section.
Close
Open
Installation tool
Insert installation
tool into slots on
membrane lock.
Then unscrew
membrane lock
from membrane
cap
Figure 57: Use Tool to take
out (or put in) membrane
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