Teledyne 3000ZA - Trace oxygen analyzer User Manual
Page 52
Operation
3000ZA
Teledyne Analytical Instruments
40
If you are using password protection, you will need to enter your
password to gain access to either of these functions. Follow the
instructions in sections 4.3.3 to enter your password. Once you have
gained clearance to proceed, you can enter the Zero or Span function.
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
A
UTO
M
ODE
Z
EROING
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
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 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