General Notes; Guidelines For Photometric Measurements; Method Notes - Lovibond MiniDirect Mode D'emploi

General notes

GB

Guidelines for photometric measurements

1 . Vials, caps and stirring rods should be cleaned thoroughly after each analysis to prevent
interferences . Even minor reagent residues can cause errors in the test result .
2 . The outside of the vial must be clean and dry before starting the analysis . Clean the
outside of the vials with a towel . Fingerprints or other marks will be removed .
3 . Zero calibration and test must be carried out with the same vial as there may be slight
differences in optical performance between vials .
4 . The vials must be positioned in the sample chamber for zeroing and test with the
on the vial aligned with the
5 . Always perform zeroing and test with the vial cap tightly closed . Only use the cap with
a sealing ring .
6 . Bubbles on the inside wall of the vial leads to incorrect measurements . To prevent this,
remove the bubbles by swirling the vial before performing the test .
7 . Avoid spilage of water into the sample chamber because this can lead to incorrect test
results .
8 . Contamination of the lens in the sample chamber can result in errors . Check at regular
intervals and – if necessary – clean the light entry surfaces of the sample chamber using
a moist cloth or cotton buds .
9 . Large temperature differences between the instrument and the environment can lead to
errors – e .g . due to the formation of condensation in the area of the lens or on the
vial .
10 . To avoid errors caused by stray light do not use the instrument in bright sunlight .
11 . Always add the reagent tablets to the water sample straight from the foil without touching
them with the fingers .
12 . The reagents must be added in the correct sequence .

Method notes

• Prior to measurement ensure that the sample is suitable for analysis (no major interferences)
and does not require any preparation i .e . pH adjustment, filtration etc .
• Reagents are designed for use in chemical analysis only and should be kept well out of
the reach of children .
• Ensure proper disposal of reagent solutions .
• Material Safety Data Sheets: available on request
(Internet: www .tintometer .de)
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MiniDirect_ClpH_1 09/2008
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