3600 Analyzer for O
2
Measurement—Operator’s Manual 13
3600O2.OM.E9903
MEASURE OPTIONS
CALIBRATE
use the “ñ” or “ò” key to highlight “Calibrate”, and then press “ENTER”.
CALIBRATION
IN AIR
To calibrate in air, use the “ñ” or “ò” key to highlight “In Air”, and then press
“ENTER”. This activates the calibration routine.
NOW 95.00% OF
LAST CALIBRATION
The instrument displays the sensitivity of the sensor (that is, the current per unit
partial pressure of oxygen) as a percentage of the sensitivity determined when
calibration was last performed. If, for example, “95% of last calibration” is
displayed, as shown here, then sensitivity has drifted downwards by 5 % since
calibration was last performed. The displayed percentage must be between 30%
and 170% in order to be able to proceed. If this is the case, press “ENTER” to
execute the calibration and display this message briefly . . .
CALIBRATION
COMPLETE
. . . followed by the “Calibration In Air” screen. If you press “ENTER” when the
displayed percentage is outside the permitted range, you will see
CALIBRATION
OUT OF BOUNDS
and you will need to re-examine the sensor for conditions discussed in section 1.2.
In most instances, the sensor will need to be serviced, a procedure described in
section 1.5.
In the program flow chart, section 1.3.1, you will see the note “After first
calibration”. The system considers a “first calibration” to be performed whenever
any particular membrane model is selected by pressing “ENTER” in the “Select
Membrane” menu, or when you have changed any of the options in the “Gas to
Measure” menu. Instead of getting a message on-screen with a percentage of the
“last calibration”, you will see a screen like the following as the system
compensates for the change in parameters;
NOW 95.00% OF
EXPECTED CURRENT
Pressing “ENTER” here will give you either a “Calibration Complete” or
“Calibration out of Bounds” message, as described above.
For reference, a four-page “Table of Oxygen Calibrations” is included in Appendix
1. These tables are useful for verifying your results when have finished sensor
calibration and are back in the “Measurement” mode.
It is possible to receive a “CALIBRATION OUT OF BOUNDS” message even
though you have thoroughly serviced the sensor in accordance with the
procedures in section 1.5. While it is possible that the sensor is in need of repair by
an authorized Orbisphere service representative, it is also possible that the
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