Teledyne 326, 327 and 328 - Oxygen analyzers User Manual

Page 35

Teledyne Analytical Instruments

Maintenance

Model 326/327/328

5-1

Maintenance &

Maintenance & T

Trrrrroub

oub

oubleshooting

leshooting

5.1 Maintenance

5.1.1 Routine Maintenance

Most 326 series analyzers contain no moving parts (although some

contain an analog meter movement, solenoid, or relay contacts), and there-
fore, periodic service is not required. The sample flow check and calibration
outlined in Section 4 should be adequate to keep the analyzer functioning
throughout the life span of a given Micro-Fuel Cell.

Special designs may require sample systems with filter elements, valves,

etc., and those components will require inspection or replacement as needed
to keep the instrument in service. A periodic inspection schedule (once per
week, once per month, etc.) will be sufficient to determine problems before
they become serious.

5.1.2 Special Shut-Down Precaution for Class A-3 Cell

When the analyzer is equipped with a Class A-3 cell, it must be pro-

tected from prolonged exposure (more than 4 hours) to CO

-free atmo-

spheres (such as air). This can be accomplished by trapping CO

-containing

sample (flue gas) by closing the input manifold valves and sealing the vent
connection with a valve, water trap or clamped-off plastic tubing.

5.1.3 Cell Replacement

When the Micro-Fuel Cell nears the end of its useful life, sensitivity will

decline very rapidly. The initial response to this phenomenon is to
recalibrate the analyzer. If many turns of span control are required, or if the
control does not have sufficient range to recalibrate the analyzer, a new
Micro-Fuel Cell is required.