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4 Operation
Before replacing the cell:
a. Check your span gas to make sure it is within specifications.
b. Check for leaks downstream from the cell, where oxygen may be
leaking into the system.
If there are no leaks and the span gas is OK, replace the cell as de-
scribed in chapter 5, Maintenance.
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
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 Δ Δ Δ Δ Δ ∇ arrow keys to toggle between AUTO and MAN span
settling. Stop when AUTO appears, blinking, on the display.
Press Enter to move to the next screen.
This menue allows the operator to set the time the analyzer should be
held in the 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 UP or DOWN keys. (A longer Cal holding time will result in a
slightly more accurate calibration. Five (5) minutes is appropriate for most
users and applications.)
Press Enter to move to the next screen.
4-14
CELL FAIL/ ZERO HIGH
Auto Mode Spanning
Span: Settling: AUTO
<ENT> For Next
Calib. Holding time
Cal hold: 5 min
Span Val: 000008.00
<ENT>Span <UP>Mod #
Teledyne Analytical Instruments
Model 3000TB
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