Teledyne Analytical Instruments 311PC, Instruction Manual, Page: 19 / 30

Percent Oxygen Analyzer Maintenance 4
4–3
Teledyne Analytical Instruments
Place the cell on the end of the manifold plug so that the sensing
surface of the cell is in contact with the plug and the electrical contact plate
end of the cell is facing upwards. Insert the cell and plug in the manifold
cavity, and screw the plug back into place. Apply as much pressure as you
can with your fingers, but use no tools.
4.4 Cell Warranty
The Class B-1 cell employed in the Model 311PC is warranted for six
(6) months of service.
With regard to spare cells, service time starts when the cell is removed
from its shipping package. The customer should stock only one spare cell
per instrument at a time. Do not attempt to stockpile spare cells.
The Model 311PC should not be used in applications where CO
2
is a
major component in the sample. Concentrations of 1,000 ppm or less will
not effect the cell performance. Figure 4-1 is a graph showing the effects of
CO
2
on cell life.
If a cell was working satisfactorily, but ceases to function before the
warranty period expires, the customer will receive credit, on a prorated
basis, toward the purchase of a new cell.
If you have a warranty claims must return the cell in question to the
factory for evaluation. If it is determined that failure is due to faulty work-
manship or material, the cell will be replaced at no cost to the customer.
Note: Evidence of damage due to tampering or mishandling will render
the cell warranty null and void.
4.5 Transduction and Temperature
Compensation
The Micro-Fuel Cell has an inherent positive temperature coefficient,
the effects of which have been minimized through the implementation of a
calibrated thermistor compensation circuit.
Internal electronic calibration is accomplished by TAI. However,
should there be any doubt concerning it, the following procedure can be
used to recalibrate. Refer to the schematic.
1. Disconnect cell
2. Move range switch to “cal” position.