Thermo Fisher Scientific CyberScan DO 110 User Manual
Page 52
Instruction Manual
CyberScan DO 110
47
Figure 35: Use Tool to take out
(or put in) membrane
10.4
Membrane/O-ring Replacement (Optional Procedure)
It is recommended only experienced service personnel can perform this procedure.
This procedure is OPTIONAL, and should only be performed if you have new
membrane and O-ring. You are also required to have a membrane installation tool.
These items are available as optional accessories in the “Accessories” section.
Pull off the probe guard.
1. Unscrew the membrane cap from the probe.
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 35
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.
Figure 34: Positioning
of O-ring & membrane
Close
Open
Installation tool
Insert installation
tool into slots on
membrane lock.
Then unscrew
membrane lock
from membrane
cap