Environmental Express 99561-78, Инструкция по эксплуатации

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V1_04.2022 3
Guidelines for colorimetric measurements
1. Vials, caps and stirring rods should be cleaned thoroughly after each analysis to pre-
vent interference. 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 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 vials must be positioned in the sample chamber for zeroing and test with the mark
on the vial aligned with the mark on the instrument.
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 because this 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 led to
errors – e.g. due to the formation of condensation in the cell chamber 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
1. Prior to measurement ensure that the sample is suitable for analysis (no major inter-
ferences and does not require any preparation i.e. pH adjustment, filtration etc
2. Different Refill Packs available on request.
3. Reagents are designed for use in chemical analysis only and should be kept well out
of the reach of children.
4. Ensure proper disposal of reagent solutions.
5. Material Safety Data Sheets are available on request or for immediate download on
the web: www.environmentalexpress.com