Hach DR/850 Procedures Manual page 89

CHLORAMINE, MONO, Low Range, continued
Summary of Method
Instrument Setup
In the presence of a cyanoferrate catalyst, monochloramine in the
sample reacts with a substituted phenol to form an intermediate
monoimine compound. The intermediate couples with excess
substituted phenol to form a green-colored indophenol, which is
proportional to the amount of monochloramine present in the sample.
Sample Temperature
° C
5
7
9
10
12
14
16
18
20
23
25
>25
This procedure will add the current method as a new Hach
program to your DR/850 or DR/890.
1. Turn on the instrument by pressing the
2. Press the
SETUP
3. Press the down arrow key until the prompt line shows
4. Press the
ENTER
5. Enter , followed by
8138
6. Enter each of the numbers in the right column, each followed
by . The line numbers in the left column relate to the
ENTER
line number on the display. At any time, you may use the
arrow keys to scroll back to review or change a number
already entered.
89
° F
40
42
48
50
54
58
61
68
73
75
77
>77
key.
key.
.
ENTER
Minutes
10
9
8
8
7
7
6
4
3
2.5
2
2
key.
ON
USER
.