Teledyne 3000TA-XLEU - Trace oxygen analyzer - Manual (Page 67)

Trace Oxygen Analyzer Operation
Teledyne Analytical Instruments 51
Generally, you have a good zero when Slope is less than 0.05
ppm/s for about 30 seconds. When Slope is close enough to zero, press
Enter.
In a few seconds, the screen will update.
Once zero settling is completed, the information is stored in the
microprocessor, and the instrument automatically returns to the Analyze
mode.
4.4.1.3 C ELL F AILURE
Cell failure in the 3000TA-XL-EU is usually associated with
inability to zero the instrument down to a satisfactorily low ppm reading.
When this occurs, the instrument will still Zero, but the 3000TA-XL-EU
system alarm trips, and the LCD displays a failure message.
#.# ppm Anlz
CELL FAIL/ ZERO HIGH
Before replacing the cell:
1. Check your span gas to make sure it is within specifications.
2. Check for leaks up-stream from the cell, where oxygen may
be leaking into the system.
If there are no leaks and the span gas is within specification,
replace the cell as described in Chapter 6, 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 UTO M ODE S PANNING
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.