Instrument offset Turb 2000 Series
22 ba75695e03 10/2013
5.1 Indexing calibration cuvettes
To achieve the greatest accuracy, and account for normal scratches and aberrations in cuvette glass
when calibrating, we recommend indexing the cuvettes.
Standards and standard kits purchased from WTW are supplied with indexing rings.
The following steps allow repeatable indexing of calibration standards:
1. With the instrument in AUTO mode insert the standard.
2. Slowly rotate the standard, inside the optical well, one complete revolution (
360º). While rotating the standard slowly, observe the measured turbidity and locate the position of
the cuvette having the lowest reading.
3. With the calibration standard positioned at the location having the lowest turbidity reading, install the
indexing ring over the cap on the standard. While doing so, make sure the pointer of the indexing
ring faces directly forward.
Indexing:
When using the standards in future, always insert the standard so that the pointer of the indexing ring
faces forward. Slowly rotate the standard back and forth about
5° to find the lowest point. The standard is now indexed and ready for use.
5.2 Restoring factory settings
If the instrument is unable to perform a calibration due to a low lamp output or a calibration using the
wrong standards, the instrument will display CAL on the lower row of the display and Err on the upper
row. The operator has two choices to correct this problem. If the operator can determine whether a poor
calibration or a low lamp caused the problem, he/she can remedy the problem and recalibrate. If the
problem cannot be remedied, you can restore the factory settings. To do so, proceed as follows: Push
and hold the button. Now push and release the OK button then release the button. Factory
calibration and factory configuration have now been restored.
Note
Restoring the factory settings allows the use of the Turb 2000 series with reduced accuracy.
The original problem still exists and must be determined and corrected before accurate
operation of the instrument will be resumed.
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