Trace Oxygen Analyzer | Operation 4 | |
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typing in the concentration of the span gas you are using, repeatedly select ENTER until the rightmost digit is reached, then, the next ENTER will exit the Span Val field. One more ENTER will enter the new span value, bring up the next screen, and start the span calibration.
#### | ppm | 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 output corre-
sponds, within tolerance, to the value of the span gas concentration. Then the instrument automatically returns to the ANALYZE mode.
4.8.2.2Manual Mode Spanning
ENTER SPAN from the MAIN MENU to start the SPAN function. The screen that appears allows you to select whether the span calibration is to be performed automatically or manually.
Span: Settling:MAN
<ENT> For Next
Use DOWN/UP to toggle between AUTO and MAN span settling. Stop when MAN appears on the display. Use ENTER to move to the next screen.
Span Val: 209000.00 <ENT>Span <UP>Mod #
Use UP to permit modification (Mod #) of span value.
Use ESCAPE/ENTER to choose the digit, and use DOWN/UP to choose the value of the digit.
When you have finished typing in the concentration of the span gas you are using, repeatedly select ENTER until the rightmost digit is reached, then, the next ENTER will exit the Span Val field. One more ENTER will enter the new span value, bring up the next screen, and start the span calibration.
Once the span has begun, the microprocessor samples the output at a predetermined rate. It calculates the difference between successive samplings and displays this difference as Slope on the screen. It takes several seconds for the first Slope value to display. Slope indicates rate of change of the Span reading. It is a sensitive indicator of stability.
####% Span
Slope=#### ppm/s
Teledyne Analytical Instruments |