Teledyne 3000TA-EU - General purpose trace oxygen analyzer User Manual

Page 70

Maintenance 3000TA-

Teledyne

Analytical

Instruments

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 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!).

5.2.2 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:

Check your span gas to make sure it is within
specifications.

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:

1. Remove power to the instrument by unplugging the power

cord at the power source.

2. Open the front panel door by pressing the release button on

the top right corner of the door all the way in with a narrow
gauge tool, such as a small screwdriver, and releasing it.