Teledyne 306WA - Analog trace oxygen analyzer - Manual (Page 29)

5-5
TELEDYNE ELECTRONIC TECHNOLOGIES
Analytical Instruments
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5.5.2 Lead Electrode 5.5.2 Lead Electrode 5.5.2 Lead Electrode 5.5.2 Lead Electrode 5.5.2 Lead Electrode
If electrode is discolored when new, or has obviously deteriorated
from use, it may be necessary to clean or replace the electrode. Use the
following procedure while referring to Figure 9.
If the lead electrode is simply discolored, clean the entire cell accord-
ing to the following procedure:
a) Heat a quart of Teledyne cleaning solution to slightly below the
boiling point, and completely fill the cell cavity with the heated
solution.
b) Let the solution stand for approximately five minutes. Drain
and dispose of solution.
c) Repeat steps a) and b).
d) Rinse the cell with distilled water and then fill with electrolyte.
Let stand for approximately two minutes and then drain and
dispose of electrolyte.
e) Refill the cell with electrolyte, immersing the lower edge of the
silver screens to about a 3/32 " 3/32 " 3/32 " 3/32 " 3/32 " depth.
If the lead electrode is obviously beyond repair, it must be replaced.
a) Remove the terminal nuts by removing them from the mounting
screws.
b) Carefully remove the screw which holds the screen assembly in
place. Remove the screen assembly. Use clean tweezers and do do do do do
not touch it with your fingers not touch it with your fingers not touch it with your fingers not touch it with your fingers not touch it with your fingers. Avoid any possible
contamination of the screen.
c) Cleanse the cell thoroughly in electrolyte solution.
d) Insert the new lead electrode in place in the cell body and
secure with lock washers and screws.
e) Carefully install screen assembly and secure with mounting
screw.
f) Immerse the cell assembly in hot cleaning solution and then
rinse in distilled water.
g) Install prepared cell assembly as described in section 4.2.3: Cell 4.2.3: Cell 4.2.3: Cell 4.2.3: Cell 4.2.3: Cell
Installation Installation Installation Installation Installation.
5.6 Screen Assembly 5.6 Screen Assembly 5.6 Screen Assembly 5.6 Screen Assembly 5.6 Screen Assembly
The screen assembly will become discolored after prolonged use due
to contamination. When this occurs, and if the cell no longer displays