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3 Operation Model 6600
3-18 Part I
Teledyne Analytical Instruments
software steps in the zeroing process that the system must complete, AFTER
settling, before it can go back to Analyze. Software zero is indicated by S–
Zero in the lower right corner.
NOTE: In a Oil/Water sampling system, when performing a sched-
uled zero, instrument will go to span mode automatically (when span flag
option has been purchased).
####.## ppm OIL
4 Left=#.### S—Zero
The zeroing process will automatically conclude when the output is within
the acceptable range for a good zero. Then the analyzer automatically returns to
the Analyze mode.
3.4.1.2 Manual Mode Zeroing
Enter the Zero function. The screen that appears allows you to select
between automatic or manual zero calibration. Use the UP/DOWN switch
between AUTO and MAN zero settling. Stop when MANUAL appears, blinking,
on the display.
Select zero
mode: MANUAL
Enter to begin the zero calibration. After a few seconds the first of three
zeroing screens appears. The number in the upper left hand corner is the first-
stage zero offset. The microprocessor samples the output at a predetermined
rate.
####.## ppm OIL
Zero adj:2048 C—Zero
The analyzer goes through C–Zero, F–Zero, and S–Zero. During C–Zero
and F–Zero, use the UP/DOWN SWITCH to adjust displayed Zero adj: value
as close as possible to zero. Then,Enter.
S–Zero starts. During S–Zero, the Microcontroller takes control as in Auto
Mode Zeroing, above. It calculates the differences between successive sam-
plings and displays the rate of change as Slope= a value in parts per million per
second (ppm/s).
####.## ppm OIL
Slope=#.### S—Zero
Once zero settling completes, the information is stored in the analyzer’s
memory, and the instrument automatically returns to the Analyze mode.