Hach-Lange ORBISPHERE K1100_M1100 Operator Manual - Manual (Page 60)

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Calibration Menu
7.3 Zero calibration
7.4 100% humid air calibration (high range sensors only)
7.5 High level adjustment
7.6 Sensor verification
Zero calibration
With this method, the sensor should be removed from the sample and exposed to pure N
2
gas. It is
recommended to use the specially designed portable calibration device for this purpose (see also
Calibration devices on page 38 ).
Press Start to start the calibration.
A screen is displayed showing the measured values and length of time the sensor has been under
calibration. These values are continually refreshed.
The value % last calibration displayed in the top box is an informational message showing the
difference between the current and previous sensor calibrations.
The Signal within range and Stability reached boxes in the top right corner indicate whether the
calibration is within acceptable limits. When both boxes indicate YES, press Finish to accept the new
calibration. A confirmation screen then asks to accept and store the new parameters.
If one or both boxes show NO, you can still perform a calibration but it is not recommended, and the
calibration should be aborted by pressing the Cancel button.
In the case of a calibration failure, attempt a second calibration after about 5 minutes. If the second
attempt also fails, then refer to your Hach Lange representative for advice.
Note:
If the Auto-End parameter is set (see Calibration configuration on page 57 ), then the calibration will
be deemed successful when the parameters defined in Stop parameters are met. You will then be asked
to confirm the calibration.
If you have not accepted or cancelled the calibration after an elapsed time of 10 minutes then the
process will time-out, and a warning message will be displayed.
In 100% humid air calibration
With this method, the sensor should be removed from the sample and exposed to air saturated with
humidity. Do this by putting a drop of water in the calibration cap before installing the cap on the sensor.
Press Start to start the calibration. The process is then the same as for the zero calibration described
previously.
High level adjustment
Note: Before using this option, ensure a zero calibration has been successfully completed first.
This calibration exposes the sensor to a gas or a liquid sample with a known gas concentration. You also
have the option to reset the sensor’s calibration parameters to factory settings (from drop-down list for
Cal. sample
).
Press Start to start the calibration. The process is then the same as for the zero calibration described
previously.
Sensor verification
Similar to the calibration procedure, but used for verifying the calibration values. The results of the
measurements made during the verification are not stored and the calibration data is not modified.