Manual Mode Spanning - Teledyne 6020 Operating Instructions Manual

Photometric analyzer

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3 Operation

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

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.

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.

When the

(Generally, when the

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.

3-20

Part I

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