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Percent Oxygen Analyzer Operation 4
4-11
Teledyne Analytical Instruments
Although the B-1 cell is standard in the 3000PA, check Specific Model
Information in the Front Matter in this manual for the class of cell you
purchased. Then check Cell Replacement in chapter 5 Maintenance, and do
the prescribed calculations.
If a weak cell is indicated, replace the cell as described there in chapter
5.
4.4.2 Span Cal
The
Span
button on the front panel is used to span calibrate the ana-
lyzer. 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 cali-
bration can also be performed manual mode, where the operator determines
when the span concentration reading is acceptable and then manually exits
the function.
4.4.2.1 Auto Mode Spanning
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.
Span: Settling: AUTO
<ENT> For Next
Press
Enter
to move to the next screen.
Span Val: 20.90
<ENT>Span <UP>Mod #
Use the
∆∆
∆∆
∆∇ arrow keys to enter the oxygen-concentration mode. Use
the < > arrow keys to blink the digit you are going to modify. Use the
∆∆
∆∆
∆∇
arrow keys again to change the value of the selected digit. When you have
finished typing in the concentration of the span gas you are using (20.90 if
you are using air), press
Enter
to begin the Span calibration.
#### % Span
Slope=#### ppm/s
The beginning span value is shown in the upper left corner of the
display. As the span reading settles, the screen displays and updates informa-
tion on Slope. Spanning automatically ends when the slope is less than 1/50