15
Chapter 2
– Description of unit
Water softening system
For the error-free operation of the unit, the HD 450/HD 450
Injection
requires softened water.
Tap water that exceeds a certain hardness level (21°dH) must be
softened in order that no deposits gather on the instruments and the
inside of the cleaning unit. This is why the unit has an in-built water
softening system. The resulting water quality and performance is
optimally configured for
the HD 450/HD 450
Injection
. For the regeneration of
the water softening system, IRA salt (Art.No. 103 006) is to be used.
WARNING!
The in-built water softening system is optimized for a hardness level of 22
–
40°dH. For levels higher than 40°dH, an external water softening system is
required.
■ If an external water softening system is used, it is sufficient to use
the Thermo Tab (Art.No..: 100 921) as the processing medium.
Water hardness is always measured in °dH.
°dH
mmol/l
°f
°e
°dH
mmol/l
°f
°e
°dH
mmol/l
°f
°e
1
0.2
2
2
15
2.7
27
19
29
5.2
52
37
2
0.4
4
3
16
2.9
29
20
30
5.4
54
38
3
0.5
5
4
17
3.1
31
22
31
5.6
56
39
4
0.7
7
5
18
3.2
32
23
32
5.8
58
41
5
0.9
9
7
19
3.4
34
24
33
5.9
59
42
6
1.1
11
8
20
3.6
36
25
34
6.1
61
43
7
1.3
13
9
21
3.8
38
27
35
6.3
63
44
8
1.4
14
10
22
4.0
40
28
36
6.5
65
46
9
1.6
16
12
23
4.1
41
29
37
6.7
67
47
10
1.8
18
13
24
4.3
43
3
38
6.8
68
48
11
2.0
20
14
25
4.5
45
32
39
7.0
70
49
12
2.2
22
15
26
4.7
47
33
40
7.2
72
51
13
2.3
23
17
27
4.9
49
34
14
2.5
25
18
28
5.0
50
36
Table 1: Conversion table for water hardness