Hach LDO Betriebsanleitung Seite 7

If the value does not stabilize, the display will show "Unable to Calibrate" followed by an error
message. Table 4 shows the error message and resolution for calibration problems.
Message
Calibration failed! Offset is too high. The calculated offset value is too high.
Calibration failed! Offset is too low.
Calibration failed! Unstable
Exit the calibration procedure
1. During calibration, push the BACK key. Three options are shown:
Option
Cancel
Return to
calibration
Exit
2. Select one of the options. Confirm.
Reset calibration defaults
Calibration settings can be reset to the factory defaults. Gain and offset values are set to 1.0 and 0.0,
respectively.
1. Go to MENU>SENSOR SETUP>[Select Sensor]>CALIBRATION>RESET CALIBRATION.
2. The display will show a confirmation message. Confirm to reset the sensor to the factory default
calibration curve.
Maintenance
Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the
document.
Explosion hazard. Do not connect or disconnect electrical components or circuits to the equipment
unless power has been switched off or the area is known to be non-hazardous.
Explosion hazard. Substitution of components may impair suitability for Class 1, Division 2. Do not
replace any component unless power has been switched off and the area is known to be non-
hazardous.
The hazardous location certified version of this product does not fulfill the requirements of the 94/9/EC Directive
(ATEX Directive).
Table 4 Sample cal error messages
Description
The calculated offset value is too low.
The value did not stabilize in the maximum allowed
calibration time.
Description
Stop the calibration. A new calibration must start from the beginning.
Return to the current calibration.
Exit the calibration temporarily. Access to other menus is allowed while the calibration
continues in the background. A calibration for a second sensor (if present) can be
started. To return to the calibration, push the MENU key and select Sensor Setup,
[Select Sensor].
D A N G E R
D A N G E R
D A N G E R
N O T I C E
Resolution
Repeat the calibration.
Repeat the calibration.
Repeat the calibration.
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