Teledyne TurbO2 - Portable trace oxygen analyzer - Manual (Page 16)

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TURBO
2
Portable Trace Oxygen Analyzer
Teledyne Analytical Instruments
Routine Maintenance
Beyond adhering to a battery recharge schedule, no routine mainte-
nance is required, as there are no moving parts in the instrument other than
the meter movement. The Micro-fuel Cell is a sealed, modular component
that should be replaced only when expired or faulty.
Cell Replacement
The characteristics of the Micro-fuel Cell are similar to those of a
mercury battery in that both provide an almost constant output through their
useful life, and then fall off sharply towards zero at the end. If the sample
being analyzed has a low oxygen concentration, cell failure will probably be
indicated by the inability to properly calibrate the analyzer. You will find that
very little adjustment of the SPAN potentiometer will be required to keep the
analyzer calibrated properly during the duration of a given cell’s useful life.
If many turn adjustments clockwise are required to calibrate the instrument,
or calibration cannot be achieved within the range of the control, the cell
should be replaced.
To offset the possibility of not having a replacement cell available when
it is needed, TAI recommends that a spare cell be purchased shortly after the
instrument is placed in service, and each time the cell is replaced thereafter.
The spare cell should be carefully stored in an area that is not subject to
large variations in ambient temperature (75°F nominal), and in such a way as
to obviate any possibility of incurring damage. Do not open the cell pack-
age until the cell is to be actually used. If the cell package is punctured and
air permitted to enter, the cell will immediately start to react to the presence
of oxygen.
To replace the Micro-fuel Cell:
1. Loosen the 2 screws (designated by arrows) on the back panel
(see outline dwg. C-45254 or C-57975).
See Figure 2.
2. Remove the screw located on each side of the top cover and
gently slide the cover up and off.
3. Remove the 3 wing nuts on top of the cell block and remove the
cell cap. Carefully remove the old cell from the cell cap and
dispose of it in accordance with local regulations (see the
Material Safety Data Sheet at the end of the manual).
See Figure 3.