Teledyne 3000TB-XL - Trace oxygen analyzer - Manual (Page 65)

Trace Oxygen Analyzer Maintenance 5
5-3
Teledyne Analytical Instruments
5.3.1 Storing and Handling Replacement Cells
To have a replacement cell available when it is needed, it is recom-
mended that one spare cell be purchased 9-10 months after commissioning
the 3000TB, or shortly before the end of the cell's one year warranty period.
CAUTION: Do not stockpile cells. The warranty period starts on
the day of shipment.
The spare cell should be carefully stored in an area that is not subject to
large variations in ambient temperature (75 °F nominal) or to rough handling.
WARNING: THE SENSOR USED IN THE MODEL 3000TB
­XL
TRACE
OXYGEN ANALYZER USES ELECTROLYTES WHICH
CONTAIN TOXIC SUBSTANCES, MAINLY LEAD AND
POTASSIUM HYDROXIDE, THAT CAN BE HARMFUL IF
TOUCHED, SWALLOWED, OR INHALED. AVOID CON-
TACT WITH ANY FLUID OR POWDER IN OR AROUND
THE UNIT. WHAT MAY APPEAR TO BE PLAIN WATER
COULD CONTAIN ONE OF THESE TOXIC SUB-
STANCES. IN CASE OF EYE CONTACT, IMMEDIATELY
FLUSH EYES WITH WATER FOR AT LEAST 15 MIN-
UTES. CALL PHYSICIAN. (SEE APPENDIX, MATERIAL
SAFETY DATA SHEET.)
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 permitted to enter, the cell will
require an excessively long time to reach zero after
installation (1-2 weeks!).
5.3.2 When to Replace a Cell
The characteristics of the Micro-Fuel Cell show an almost constant
output throughout its useful life and then fall off sharply towards zero at the
end. Cell failure in the 3000TB
­XL is usually characterized inability to zero the
instrument down to a satisfactorily low ppm reading (about 5ppm). When
this occurs, the 3000TB system alarm trips, and the VFD displays a failure
message.
#.# ppm Anlz
CELL FAIL/ ZERO HIGH
Before replacing the cell: