Teledyne TRACE OXYGEN ANALYZER 356WA - Manual (Page 24)

Teledyne Analytical Instruments 5-2
5 Maintenance & 5 Maintenance & 5 Maintenance & 5 Maintenance & 5 Maintenance & T T T T Trrrrroub oub oub oub oubleshooting leshooting leshooting leshooting leshooting Model 356W Model 356W Model 356W Model 356W Model 356WA A A A A
5.4 Calibration 5.4 Calibration 5.4 Calibration 5.4 Calibration 5.4 Calibration
The sensitivity of the unit should be checked at two to four week
intervals. Calibration procedures are described in Section 4.7: Calibration .
5.5 Cell 5.5 Cell 5.5 Cell 5.5 Cell 5.5 Cell
The electrochemical reaction in the analytical process results in the
accumulation of lead ions in the electrolyte, making the replacement of the
lead electrode or the electrolyte necessary.
5.5.1 Electrolyte Replacement 5.5.1 Electrolyte Replacement 5.5.1 Electrolyte Replacement 5.5.1 Electrolyte Replacement 5.5.1 Electrolyte Replacement
Replace the electrolyte at least every two months, or even more fre-
quently if foreign matter is accumulating in the cell. Remove the cell from is
compartment, and drain, clean, rinse, and refill as described in Section 4.2.3:
Cell Installation . After the cell is serviced or replaced, calibrate the analyzer
as outlined in Section 4.7: Calibration .
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 5-1.
If the lead electrode is simply discolored, clean the entire cell according
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 in an approved manner.
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 in an approved manner.
e) Refill the cell with electrolyte, immersing the lower edge of the
silver screens to about a 3 3 3 3 3 /////
32 32 32 32 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