Teledyne 3000PB - Bulkhead mount percent oxygen analyzer - Manual (Page 51)

Percent Oxygen Analyzer Operation 4
4-11 Teledyne Analytical Instruments
the prescribed calculations. If a weak cell is indicated, replace the cell as
described.
4.4.2 Span Cal
The Span button on the control 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 manual mode, where the operator deter-
mines 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
ΔΔΔΔΔ∇ 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
ΔΔΔΔΔ∇ arrow keys to enter the oxygen-concentration mode. Use
the < > arrow keys to blink the digit you are going to modify. Use the
ΔΔΔΔΔ∇
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 span concentration
corresponds, within tolerance, to the value of the span gas concentration.
Then the instrument automatically returns to the analyze mode.