Teledyne 3000 Ultra Trace - PPB oxygen analyzer - Manual (Page 48)

4 Operation Model Ultra Trace 3000
4-14 Teledyne Analytical Instruments
instrument returns back to analyzer mode without taking the zero calibration.
The Ultra Trace 3000 system alarm trips, and the LCD displays a failure
message.
#.# ppm Anlz
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.
c. Check if more purging time with Zero calibration gas is needed.
If there are no leaks and the span gas is within specification, replace the
cell as described in chapter 5, Maintenance.
The failure alarm and failure message will reset after entering the Zero
mode.
4.4.2 Span Cal
The Span button on the front panel is used to span calibrate the ana-
lyzer. 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 cali-
bration can also be performed in manual mode, where the operator deter-
mines when the span concentration reading is acceptable and manually exits
the function.
4.4.2.1 Auto Mode Spanning
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