Teledyne operating instructions Sensor Installation or Replacement, Maintenance Model 3300PA

5 Maintenance Model 3300PA

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.

5.2Sensor 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 eliminatethepossibilityofincurringdamage.

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-

5-2 Teledyne Analytical Instruments