Teledyne 3000TA - General purpose trace oxygen analyzer - Manual (Page 56)

5 Maintenance Model 3000TA
5-2 Teledyne Analytical Instruments
WARNING: THE SENSOR USED IN THE MODEL 3000TA TRACE
OXYGEN ANALYZER USES ELECTROLYTES
WHICH CONTAIN TOXIC SUBSTANCES, MAINLY
LEAD AND POTASSIUM HYDROXIDE, THAT CAN
BE HARMFUL IF TOUCHED, SWALLOWED, OR
INHALED. AVOID CONTACT WITH ANY FLUID OR
POWDER IN OR AROUND THE UNIT. WHAT MAY
APPEAR TO BE PLAIN WATER COULD CONTAIN
ONE OF THESE TOXIC SUBSTANCES. IN CASE OF
EYE CONTACT, IMMEDIATELY FLUSH EYES WITH
WATER FOR AT LEAST 15 MINUTES. CALL PHYSI-
CIAN. (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!).
5.2.2 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 3000TA is usually characterized inability to zero the
instrument down to a satisfactorily low ppm reading. When this occurs, the
3000TA system alarm trips, and the LCD displays a failure message.
#.# ppm Anlz
CELL FAIL/ ZERO HIGH
Before replacing the cell:
a. Check your span gas to make sure it is within specifications.
b. Check for leaks downstream from the cell, where oxygen may be
leaking into the system.
If there are no leaks and the span gas is OK, replace the cell.
5.2.3 Removing the Micro-Fuel Cell
The Micro-Fuel cell is located inside the stainless steel cell block behind
the front panel (see Figure 5-1). To remove an existing cell: