Teledyne 356WA - page 24

Teledyne Analytical Instruments5-2

5 Maintenance & 5 Maintenance &

5 Maintenance & TT

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Model 356WModel 356W

Model 356WAA

5.4 Calibration5.4 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 Cell5.5 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 Replacement5.5.1 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 Electrode5.5.2 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 33

3//

/3232

3232

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 dodo

dodo