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Operation
Once span settling completes, the information is stored in the
microprocessor, and the instrument automatically returns to the Analyze
mode.
4.4.1.3 C
ELL
Cell failure in the 3000TB is usually associated with inability to zero
the instrument down to a satisfactorily low ppm reading. When this occurs,
the 3000TB system alarm trips, and the LCD displays a failure message.
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 as de-
scribed in chapter 5, Maintenance.
4.4.2 Span Cal
The Span button on the front panel is used to span calibrate the
analyzer. Span calibration can be performed using the automatic mode,
where an internal algorithm compares consecutive readings from the
sensor to determine when the output matches the span gas concentration.
Span calibration can also be performed in manual mode, where the
operator determines when the span concentration reading is acceptable
and manually exits the function.
4.4.2.1 A
M
UTO
Press Span to enter the span function. The screen that appears
allows you to select whether the span calibration is to be performed
automatically or manually. Use the ▲/▼ arrow keys to toggle between
AUTO and MAN span settling. Stop when AUTO appears, blinking, on
the display.
Teledyne Analytical Instruments
F
AILURE
#.# ppm Anlz
CELL FAIL/ ZERO HIGH
S
ODE
PANNING
Span: Settling: AUTO
<ENT> For Next
3000TB
50
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