Percent Paramagnetic Oxygen Analyzer Part I: Control Unit
Part I: 4-15
Teledyne Analytical Instruments
#### 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.
4.4.2.2 Manual 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 ∆∇ 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. Holding time
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 affect anything in the Manual Mode.
Just press Enter to continue.
Span Val: 000008.00
<ENT>Span <UP>Mod #
Press ∆ (<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 ∆∇ 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 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.