Teledyne 3000PAEU - General purpose percent oxygen analyzer - Manual (Page 45)

Percent Oxygen Analyzer Operation 4
4-11 Teledyne Analytical Instruments
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
For Next
Press Enter to move to the next screen.
Span Val: 20.90
Span 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
of the displayed value of the oxygen concentration (in ppm) for three min-
utes. Then the instrument automatically returns to the analyze mode.