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

5 Maintenance Model 3300TB

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

On the trace analyzers, the Micro-fuel Cell will typically fail due to exces- sive zero offset caused by loss of water. Large zero offsets will result in inaccu- rate SPAN settings. To test for this condition, purge the sensor and sample system with ZERO gas (typically nitrogen with less than 1 ppm O2). It may take several hours for the sample system and cell to return to a stable low level of O2 if it has been exposed to higher levels of O2. If the instrument will not come down to an acceptably low reading on zero gas, then a depleted cell or a sample system leak should be suspected. Typically offsets of 1.0 ppm or less are acceptable. A Cell failure may also be indicated by an inability to SPAN, or slow response to changes in O2 concentration at levels below 100 ppm.

CAUTION: Read the section Cell Warranty Conditions, below, before replac- ing the cell.

CAUTION:	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, TAI recommends that one spare cell be purchased when the current cell 's warranty period is approximately two thirds over.

CAUTION: Do not stockpile cells. The warranty period starts on the day of shipment. For best results, do not order a new spare cell to soon.

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- ted to enter, cell-life will be compromised.

5-2Teledyne Analytical Instruments