Water I.D. Primelab 2.0, Manual

Page: 244 / 301

(105)
Sulphite HR
0 - 300 mg/l (Na₂SO₃)
Tablet
Internal Name: 105-Sulphite-HR-tab
10ml
Sulphite HR N°1 Photometer (TbsHSULFHR1)
Sulphite HR N°2 Photometer (TbsPSULFHR2)
Measurement procedure:
1 Fill 10 ml test water into a clean 24 mm cuvette.
2 Screw the lid back on the cuvette.
3 Insert the cuvette into the PrimeLab. Pay attention to the arrow on the front of the cuvette.
4 Start ZERO measurement.
5 Remove the cuvette again.
6 Unscrew the lid from the cuvette.
7 Add 1 Sulphite HR N°1 Photometer tablet(s) to the test water in the cuvette.
8 Crush the tablet with a clean stirring rod.
9 Add 1 Sulphite HR N°2 Photometer tablet(s) to the test water in the cuvette.
10 Crush the tablet with a clean stirring rod.
11 Stir with the stirring rod for about 20 seconds until the reagent is completely dissolved.
11 Screw the lid back on the cuvette.
12 Gently swirl the cuvette to mix the liquid well.
13 Insert the cuvette into the PrimeLab. Pay attention to the arrow on the front of the cuvette.
14 Tap TEST to start a 02:00 minute(s) countdown.
15 After the lapse of a 02:00 minute(s) countdown the measured value is displayed.
Notes:
The test result can be converted into the following unit(s): mg/l SO₃²⁻.
Filter sample if neccessary to test a clear sample.
Cell, lid and stirring rod need to be cleaned immediately after to prevent staining.
Expect low results if tannin or tannic acid is present.
Following substances cause interferences: Chlorine (> 250 mg/l), nitrite (> 200 mg/l), iron (> 20
mg/l), sulphide (> 10 mg/l).
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