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Operation 3000TA- EU
Teledyne Analytical Instruments 44
4.4.1 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 acceptable 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.
4.4.1.1 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
manually. Use the ▲/▼ arrow keys to toggle between AUTO and MAN
zero settling. Stop when AUTO appears, blinking, on the display.
Zero: Settling: AUTO
<ENT> To Begin
Press Enter to begin zeroing.
####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 forth.
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