Manual Mode Zeroing; Cell Failure - Teledyne 3000TB Instruction Manual

Trace oxygen analyzer

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Operating instructions manual (107 pages)

Table Of Contents

Table of Contents

Trace Oxygen Analyzer

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.

Press Zero to enter the Zero function. The screen that appears allows

you to select between automatic or manual zero calibration. Use the Δ∇ keys

to toggle between AUTO and MAN zero settling. Stop when MAN appears,

blinking, on the display.

Press Enter to begin the zero calibration. After a few seconds the first

of five zeroing screens appears. The number in the upper left hand corner is

the first-stage zero offset. The microprocessor samples the output at a prede-

termined rate. It calculates the differences between successive samplings and

displays the rate of change as Slope= a value in parts per million per second

(ppm/s).

NOTE:It takes several seconds for the true Slope value to display.

Wait about 10 seconds. Then, wait until Slope is sufficiently

close to zero before pressing Enter to finish zeroing .

Generally, you have a good zero when Slope is less than 0.05 ppm/s

for about 30 seconds. When Slope is close enough to zero, press Enter. In a

few seconds, the screen will update.

Once span settling completes, the information is stored in the

microprocessor, and the instrument automatically returns to the Analyze

mode.

Cell failure in the 3000TB is usually associated with inability to zero

the instrument down to a satisfactorily low ppm reading. When this occurs,

the 3000TB system alarm trips, and the LCD displays a failure message.

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