Hach LZY904.98.00002 Instructions D'utilisation page 16

3.3 Prevent vial contamination
Do not to touch or scratch the glass of the sample vial. Contamination or scratches on the glass can cause
measurement errors.
The glass must stay clean and have no scratches. Use a no-lint cloth to remove dirt, fingerprints or
particles from the glass. Replace the sample vial when the glass has scratches.
Refer to Figure 2 to identify where not to touch the sample vial. Always keep the sample vials in the
vial stand to prevent contamination on the bottom of the vial.
Figure 2 Sample vial overview
1 Measurement surface—Do not touch.
3.4 Calibrate with vials without RFID
3.4.1 Prepare the standard vial(s)
Chemical exposure hazard. Dispose of chemicals and wastes in accordance with local, regional and
national regulations.
Always put a cap on the sample vial to prevent spills in the vial compartment.
To use sealed vials for calibration, immediately go to
on page 18. To use unsealed vials for calibration, prepare the standard vial(s) as follows:
1. For formazin calibration, prepare the formazin standards with 4000-NTU formazin stock solution.
Refer to Prepare Formazin standards
Note: To make 4000-NTU formazin stock solution, refer to .
2. Prepare the standard vial(s). Refer to the illustrated steps that follow.
• FORMAZIN 0–40 NTU (or 0–40 FNU) calibration—Two vials: formazin 20 NTU and dilution
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water used to prepare the formazin standard.
• FORMAZIN 0–700 NTU (or 0–1000 FNU) calibration—Three vials: formazin 20 NTU,
formazin 600 NTU and the dilution water
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Make sure that the vial contains dilution water for a minimum of 12 hours before the procedure.
16 English
N O T I C E
C A U T I O N
N O T I C E
Calibration procedure—vials without RFID
on page 17.
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used to prepare the formazin standards