PASCO PS-2108 Dissolved Oxygen Sensor - Manual (Page 12)

PASPort Dissolved Oxygen Sensor Model No. PS-2108
8 ®
2. Use the supplied plunger to push the membrane cartridge
out of the cartridge housing (Figure 7A).
3. Examine the O-ring (Figure 8) and replace it if it is
damaged (See "Replacing the O-ring" below.).
4. Insert a replacement membrane cartridge and use the
plunger to push it down until it is seated at the end of the
housing that has the O-ring (Figure 7B).
5. Fill with electrolyte and reassemble the probe as directed
in steps 4 through 7 of "Changing the Electrolyte
Solution."
Replacing the O-ring
The O-ring should rarely if ever require replacing. However, if it develops nicks or splits and
begins to allow leakage of the electrolyte solution from the probe, replace it as follows:
1. Follow steps 1and 2 of the procedure for replacing the membrane
cartridge (above).
2. After removing the membrane cartridge, remove the O-ring with a pair
of fine-tipped tweezers and insert a new O-ring.
3. Insert the membrane cartridge as directed in step 4 of “Replacing the
Membrane”.
4. Fill with electrolyte and reassemble the probe as directed in steps 4
through 7 of "Changing the Electrolyte Solution."
Figure 7
Removing and replacing the
membrane cartridge.
A B
Figure 8
Examine the O-ring for
damage.