Teledyne 3000ZA - Trace oxygen analyzer - Manual (Page 54)

Operation 3000ZA
Teledyne Analytical Instruments 42
CELL FAIL/ ZERO HIGH
Before replacing the cell:
a. Check your span gas to make sure it is within specifications.
b. Check for leaks up-stream from the cell, where oxygen may be
leaking into the system.
If there are no leaks and the span gas is within specification,
replace the cell as described in chapter 5, Maintenance.
4.4.2 Span Cal
The Span button on the front panel is used to span calibrate the
analyzer. Span calibration can be performed using the automatic mode,
where an internal algorithm compares consecutive readings from the
sensor to determine when the output matches the span gas concentration.
Span calibration can also be performed in manual mode, where the
operator determines when the span concentration reading is acceptable
and manually exits the function.
4.4.2.1 A
UTO
M
ODE
S
PANNING
Press Span to enter the span function. The screen that appears
allows you to select whether the span calibration is to be performed
automatically or manually. Use the __ arrow keys to toggle between
AUTO and MAN span settling. Stop when AUTO appears, blinking, on the
display.
Span: Settling: AUTO
For Next
Press Enter to move to the next screen.
Calib. Holding time
Cal hold: 5 min
This menu allows the operator to set the time the analyzer should
be held in the AUTO span mode, after the readings of the analyzer settle.
Five minutes is the default, but it could be adjusted anywhere from 1 to
60 minutes by using the __ keys.
Press Enter to move to the next screen.
Span Val: 000008.00
Span Mod #