Lovibond Maxi Direct, Instruction Manual, Page: 84 / 268

82 MaxiDirect_2c 03/2010
1.1 Methods
DEHA (N,N-Diethylhydroxylamin)
with Vario Powder Pack
and Liquid Reagent
20 – 500 μg/l DEHA / 0.02 – 0.5 mg/l DEHA
Use two clean vials (24 mm Ø) and mark one as blank for
zeroing (Note 2).
1. Fill a clean vial with 10 ml deionised water (this is the
blank).
2. Fill the second clean vial with
10 ml of the water
sample
(this is the sample).
3. Add the contents of one VARIO OXYSCAV 1 Rgt
Powder Pack straight from the foil into each vial.
4. Close the vials tightly with the caps and swirl several
times to mix the contents.
5. Add
0.20 ml VARIO DEHA 2 Rgt Solution
to each vial
(Note 4).
6. Close the vials tightly with the caps and swirl several
times to mix the contents.
7. Press [ ] key.
Wait for a reaction
period of 10 minutes
(Note 5).
After the reaction period is finished proceed as follows:
8. Place the vial (the blank) in the sample chamber making
sure that the marks are aligned.
9. Press ZERO key.
10. Remove the vial from the sample chamber.
11. Place the vial (the sample) in the sample chamber ma-
king sure that the marks are aligned.
12. Press TEST key.
The result is shown in the display as DEHA.
Countdown 1
10:00
start:
prepare Zero
press ZERO
Zero accepted
prepare Test
press TEST
1 2
3 4
6 7 1