Teledyne 6020 - Photometric analyzer User Manual

Page 41

Photometric Analyzer

Operation 3

Part I 3-17

Teledyne Analytical Instruments

3.4.1 Zero Cal

The

Zero

function on the main menu is used to enter the zero calibration

function. Zero calibration can be performed in either the automatic or manual
mode.

Make sure the zero fluid is flowing to the instrument. If you get a

CELL

CANNOT BE BALANCED

message while zeroing skip to section 3.4.1.3.

3.4.1.1

Auto Mode Zeroing

Observe the precautions in sections 3.4 and 3.4.1, above. Enter the zero

function mode. The screen allows you to select whether the zero calibration is to
be performed automatically or manually. Use the UP/DOWN switch to toggle
between

AUTO

and

MAN

zero settling. Stop when

AUTO

appears, blinking, on

the display.

Enter

to begin zeroing.

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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=

in percent/second (unless the Slope starts within the acceptable zero range and
does not need to settle further). The system first does a coarse zero, shown in
the lower right corner of the screen as

C—Zero

, for 3 min, and then does a fine

zero, and displays

F—Zero

, for 3 min.

Then, and whenever Slope is less than 0.01 for at least 12 sec, instead of

Slope you will see a countdown:

9 Left

8 Left

, and so fourth. These are

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).

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