5-2
5 Maintenance Model 3300PA
Teledyne Analytical Instruments
fuse holder will slide out. There are two fuses in use and are visible in
the clip.
4. Remove the bad fuse and replace it with a 5x20mm 0.5 A,
250 VAC, IEC time lag (T) fuse (P /N F1128).
5. Replace the fuse holder into its receptacle, pushing in firmly until it
clicks.
5.2 Sensor Installation or Replacement
5.2.1 When to Replace a Sensor
The Micro-Fuel Cell typically provide almost constant output through their
useful life, and then fall off sharply towards zero at the end. You will find that
very little adjustment will be required to keep the analyzer calibrated properly
during the duration of a given cell’s useful life.
If the sample being analyzed has a low oxygen concentration, cell failure
will probably be indicated by the inability to properly calibrate the analyzer. If
large adjustments are required to calibrate the instrument, or calibration cannot
be achieved within the range of the ∆∇ buttons, the cell may need replacing.
Read the section Cell Warranty Conditions, below, before replacing the cell.
In addition, if the front panel Percent Oxygen Meter displays “00.0” when
the unit is plugged in, and the power switch is in the ON position, the sensor
needs to be replaced.
IMPORTANT: After replacing the Micro-Fuel Cell, the analyzer must be
recalibrated. See
Calibration
in chapter 4.
5.2.2 Ordering and Handling of Spare Sensors
To have a replacement cell available when it is needed, TBE/AI recom-
mends that one spare cell be purchased shortly after the instrument is placed in
service, and each time the cell is replaced.
CAUTION: Do not stockpile cells. The warranty period starts on the day of
shipment. For best results, order a new spare cell when the
current spare is installed.
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
eliminate the possibility of incurring damage.
CAUTION: Do not disturb the integrity of the cell package until the cell is to
actually be used. If the cell package is punctured and air is permit-