Teledyne 3060e - Ultra Trace oxygen analyzer - Manual (Page 79)

Teledyne Electronic Technologies
Analytical Instruments
4-31
Operations Operations Operations Operations Operations Ultra Ultra Ultra Ultra Ultra T T T T Trace Oxyg race Oxyg race Oxyg race Oxyg race Oxygen Anal en Anal en Anal en Anal en Analyz yz yz yz yzer er er er er
9. After pressing ACCPT the calibrator is
turned on and you can select between
manual and automatic settling. Do not
press
AUTO or MAN until the oxygen
reading has settled and is less than
5–10% of the full scale of calibration
range.
If the output does not fall below 5–10 % of full scale, return to the Analyze
mode, wait for 30 minutes, and then return to the Calibration mode. During the
waiting period, the difference in the partial pressure of oxygen in the calibration
electrolyte and the zero gas above the electrolyte forces the dissolved oxygen
out of the electrolyte. Remaining in the Analyze mode conserves the electrolyte
in the calibrator. Repeat the procedure if necessary.
Note: With the factory preset Ultra Trace span sensitivity (for details, see
Cold Start mode), the Ultra Trace sensor signal must be at least 1 /
3
of
the selected span gas value to adjust the span sensitivity to a new
value. For example, if you use a 9.00 PPM span gas, the analyzer
should display at least 3 PPM in order to adjust the span to 9.00 PPM.
If the signal is less than
1 /
3
of the selected span, stay in the calibration
mode until the signal is > 1 /
3
of the selected span. For the first time
the analyzer is switched to a span gas, the signal output will slowly
increase due to the slow wetting of the catalyst, and after some time,
reach a steady value. This is typical behavior in a gas-diffusion
electrode.
When the analyzer is span calibrated with less than 1 PPM oxygen,
make sure that background signal is not greater than 100 PPB. If you
attempt to span the analyzer with a higher background level, the
sensor output, which will be the sum of the background and span gas
signals, may go out of the range acceptible to the microprocessor and
an error message "CELL TOO STRONG" will be displayed. Press
the START key to reset the analyzer to the factory settings.
VALVES: CALIBRATO R SPAN
O XYG EN = 5.0 PPM O 2
FLO W = 150.0 CC/M IN
CHOOSE M ANUAL OR AUTO SETTLING
1 2 3 4 5
ESC M AN AUTO
VALVES: CALIBRATO R SPAN
TURNING CALIBRATOR ON
CALIBRATOR OFFSET = 0 PPB
PLEASE W AIT . . .
1 2 3 4 5