Trace Oxygen Analyzer | Operation 4 | |
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sponds, within tolerance, to the value of the span gas concentration. Then the instrument automatically returns to the analyze mode.
4.4.2.2Manual Mode Spanning
Press Span 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 the Δ∇ keys to toggle between AUTO and MAN span settling. Stop when MAN appears, blinking, on the display. Press Enter to move to the next screen.
Press Enter to move to the next screen.
Calib.Holdingtime
Cal hold: 5 min
This menue allows the operator to set the time the analyzer should be held in the AUTO span mode. It does not have any effect in the MANual mode. Just press Enter key to continue.
Span Val: 000008.00 <ENT>Span <UP>Mod #
Press Δ (<UP>) to permit modification (Mod #) of span value.
Use the arrow keys to enter the oxygen concentration of the span gas you are using (209000.00 if you are using air). The < > arrows choose the digit, and the Δ∇ arrows choose the value of the digit.
Press Enter to enter the span value into the system and begin 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 a Slope on the screen. It takes several seconds for the first Slope value to display. Slope indicates the rate of change of the Span reading. It is a sensitive indicator of stability.
####% Span
Slope=#### ppm/s
When the Span value displayed on the screen is sufficiently stable, press Enter. (Generally, when the Span reading changes by 1 % or less of the full scale of the range being calibrated, for a period of ten minutes it is
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