Teledyne 3000TA-XLEU - Trace oxygen analyzer User Manual

Page 66

Operation 3000TA-XL-EU

Teledyne

Analytical

Instruments

#### PPM Zero
Slope=#### ppm/s

The beginning zero level is shown in the upper left corner of the

display. As the zero reading settles, the screen displays and updates
information on Slope (unless the Slope starts within the acceptable zero
range and does not need to settle further).

Then, and whenever Slope is less than 0.08 for at least 3 minutes,

instead of Slope you will see a countdown: 5 Left, 4 Left, and so fourth.
These are five steps in the zeroing process that the system must
complete, AFTER settling, before it can go back to Analyze.

#### PPM Zero
4 Left=### ppm/s

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.

4.4.1.2

ANUAL

ODE

EROING

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

allows you to select between automatic or manual zero calibration. Use
the ▲▼

keys to toggle between

AUTO

and

MAN

zero settling. Stop when

MAN

appears, blinking, on the display.

Zero: Settling: Man
To Begin

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 predetermined 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).

#### ppm Zero
Slope=#### 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 .