Water I.D. Primelab 2.0, Manual

Page: 185 / 301

(97)
Nitrite HR
0 - 1500 mg/l (NaNO₂)
Tablet
Internal Name: 97-Nitrite-HR-tab
10ml
Nitrite HR N°1 Photometer (TbsHNiHR1)
Nitrite HR N°2 Photometer (TbsPNiHR2)
Measurement procedure:
1 Fill 9 ml distilled water in a clean 24 mm cuvette.
2 Fill 1 ml sample water in the same cuvette.
3 Screw the lid back on the cuvette.
4 Insert the cuvette into the PrimeLab. Pay attention to the arrow on the front of the cuvette.
5 Start ZERO measurement.
6 Remove the cuvette again.
7 Unscrew the lid from the cuvette.
8 Add 1 Nitrite HR N°1 Photometer tablet(s) to the test water in the cuvette.
9 Crush the tablet with a clean stirring rod.
10 Stir with the stirring rod for about 20 seconds until the reagent is completely dissolved.
11 Add 1 Nitrite HR N°2 Photometer tablet(s) to the test water in the cuvette.
12 Crush the tablet with a clean stirring rod.
13 Stir with the stirring rod for about 20 seconds until the reagent is completely dissolved.
14 Screw the lid back on the cuvette.
15 Gently swirl the cuvette to mix the liquid well.
16 Insert the cuvette into the PrimeLab. Pay attention to the arrow on the front of the cuvette.
17 Tap TEST to start a 05:00 minute(s) countdown.
18 After the lapse of a 05:00 minute(s) countdown the measured value is displayed.
Notes:
Filter sample if neccessary to test a clear sample.
Make sure the temperature of the sample does not exceed 30 °C.
Chlorine levels above 30 mg/l interfere with this test and can influence the reading.
The test needs to be performed without a delay. Place the vial into the PrimeLab right after
reagents have dissolved and lid is closed. Immediately press TEST. It is essential for the
accuracy of this test to keep the countdown of 05:00 minutes right after dissolving the tablets/
closing the lid/placing the vial into the PrimeLab.
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