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Teledyne 3010PAC - Split architecture percent oxygen analyzer (EU - CENELEC) User Manual

Page 83

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Appendix: A-7

Oxygen Analyzers

Appendix

Teledyne Analytical Instruments

A-5

Zero Cal

The

Zero

button on the front panel is used to enter the zero calibration

function. Zero calibration can be performed in either the automatic or manual
mode. In the automatic mode, an internal algorithm compares consecutive
readings from the sensor to determine when the output is within the accept-
able range for zero. In the manual mode, the operator determines when the
reading is within the acceptable range for zero. Make sure the zero gas is
connected to the instrument. If you get a CELL FAILURE message skip to
section 4.4.1.3.

Auto Mode Zeroing

Press

Zero

to enter the zero function mode. The screen allows you to

select whether the zero calibration is to be performed automatically or manu-
ally. Use the

∆∇ arrow keys to toggle between AUTO and MAN zero

settling. Stop when AUTO appears, blinking, on the display.

Zero: Settling: AUTO
To Begin

Press

Enter

to begin zeroing.

#### % Zero
Slope=#### ppm/s

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

play. 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

.

#### % 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.

Manual Mode Zeroing

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.