Hach 3650 manual Locking Out the Instrument’s CAL Button, Sensor Calibration Range Checking

28 of 50 Options Setup - 3650 Portable O2 Analyzer

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.

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

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.

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

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.

Enter the percentage of measurement gas in the span gas (e.g. 10.00%), then choose OK.

Fig 3-14: Span Gas Value

ORBISPHERE Operator Manual