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28 of 50 Options Setup - 3650 Portable O2 Analyzer
Operator Manual
ORBISPHERE
3.4.4 Locking Out the Instrument’s CAL Button
You can use the Configuration, Calibration Key Status menu to prevent an accidental
sensor re-calibration from the instrument keyboard.
3.4.5 Sensor Calibration Range Checking
When calibration is performed for In Air and In a Span Gas calibration modes, the
sensor measurement current is compared to an ideal current for the selected membrane
to determine whether or not to complete the calibration. You can use the Configuration,
Calibration Range Checking menu to enable or disable sensor calibration range
checking in the instrument.
Note:
It is recommended to leave range checking enabled. In special measurement situations
it may be necessary to disable range checking. However, contact a Hach Ultra
representative for further details before disabling this feature.
3.4.6 Entering a Span Gas Value
When calibrating the sensor in a span gas, use the Configuration, Span Gas menu to
enter the concentration of the gas to be measured in the span gas.
Choose Disabled to lock out the keyboard CAL button.
To unlock this capability, choose Enabled. Choose OK
when the desired mode is selected.
Fig 3-12: Lock Instrument CAL Button
Choose Disabled to calibrate without checking the value
of the measurement current, within a range of 0% to
999% of the ideal current.
When set to Enabled, at calibration the measurement
current should be between 25% and 175% of the ideal
current; if the value is outside of these limits, the
calibration fails and Err is displayed on the instrument
LCD. Choose OK when the desired mode is selected.
Fig 3-13: Calibration Range Check
Enter the percentage of measurement gas in the span
gas (e.g. 10.00%), then choose OK.
Fig 3-14: Span Gas Value