Lovibond MD 100 Mode D'emploi page 30

General notes
GB
Guidelines for photometric measurements
1. Vials, capsand stirring rodsshould be cleanedthoroughly after each analysisto prevent
interference. Evenminor reagent residues can causeerrors in the test result.
2. Theoutside of the vial must be clean and dry before starting the analysis.Clean the outside
of the vials with a towel to remove fingerprints or other marks.
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 vialsmust be positioned in the samplechamber 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 lead to incorrect measurements. To prevent this,
remove the bubbles by swirling the vial before performing the test.
7. Avoid spillage of water into the sample chamber becausethis can lead to incorrect test
results.
8. Contamination of the transparent cell chamber can result in wrong readings. Check at
regular intervals and – if necessary– clean the transparent cell chamber using lint-free,
moist cloths (oil-free) 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 cell chamber or on the vial.
10. To avoid errors causedby stray light do not use the instrument in bright sunlight.
11. Always add the reagent tablets to the water samplestraight from the foil without touch-
ing them with the fingers.
12. The reagents must be added in the correct sequence.
Method notes
• Prior to measurement ensurethat the sampleissuitable for analysis(no major interferences)
and does not require any preparation i.e. pH adjustment, filtration etc.
• Different Refill Packsavailable on request.
• Reagentsare designed for use in chemical analysisonly and should be kept well out of
the reach of children.
• Ensureproper disposal of reagent solutions.
• Material Safety Data Sheetsare available on request
(Internet: www.lovibond.com)
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mark on the instrument.
mark
MD1X0/200_1b 09/2020