Teledyne 6020 - Photometric analyzer - Manual (Page 44)

3 Operation Model 6020
3-20 Part I
Teledyne Analytical Instruments
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The beginning span value is shown in the upper left corner of the display.
As the span reading settles, the screen displays and updates information on
Slope . Spanning automatically ends when the span output corresponds, within
tolerance, to the value of the span gas concentration. Then the instrument auto-
matically returns to the analyze mode.
3.4.2.2 Manual Mode Spanning
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 UP/DOWN switch to toggle between AUTO and MAN span
settling. Stop when MAN appears, blinking, on the display. Enter to move to
the next screen.
: 100 100% . : 100 100% . : 100 100% . : 100 100% . : 100 100% .
< > < > < > < > < >
The unit field should be blinking first (%/ppm). Use the UP/DOWN switch
to set the proper unit of the span fluid and enter. Then, use the UP/DOWN
switch to set the concentration.
When you have set the concentration of the span fluid you are using, Enter
to 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.
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When the value displayed on the screen is sufficiently stable, Enter .
(Generally, when the reading changes by 1 % or less of the range being
calibrated for a period of 30 seconds it is sufficiently stable.) Once the span
ends, the calibration is stored in memory. The instrument then automatically
enters the
Analyze function.