4 Operation | Model 7300A | |
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ENTER will move the blinking field to units (%/ppm). Use UP/DOWN key to select the units, as necessary. When you have set the concentration of the span gas you are using, Enter to begin the Span calibration.
####.##% CO2
Slope=#.### Span
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.
4.4.2.2Manual Mode Spanning
Scroll Span by using UP/DOWN key and Enter to start the Span function. The screen that appears allows you to select whether the span calibration is to beperformedautomaticallyormanually.
Select span mode: MANUAL
Use the UP/DOWN key to toggle between AUTO and MAN span setting. Stop when MAN appears, blinking, on the display. ENTER to move to next subfunctionscreen
Span Val: 2Ø.ØØ % <ENT> To begin span
Using the UP/DOWN key changes the span value, as necessary. Enter to move to the units field (%/ppm). Use UP/DOWN key to select unit.
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.
####.##% CO2
Slope=#.### Span
When the Spanvalue displayed on the screen is sufficiently stable, press Enter. (Generally, when the Span reading changes by 1 % or less of the range being calibrated for a period of ten minutes it is sufficiently stable.) Once Enter
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