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8.4
Temperature fluctuations of the inflowing cooling water
It is important that the temperature of the inflowing water remains constant. The fluctuation of temperature
should not exceed 0.5 ° C per minute or 0.05 ° C per 5 seconds.
8.5
Flow rate
The safety interlock is unblocked at:
Device type
CPM F-1
CPM F-10, CPM C-9
CPM F-20
CPM F-30
Tab. 8.3:
Minimum flow rate
The highest measurement accuracy is reached at a typical flow rate of:
Device type
CPM F-1
CPM F-10, CPM C-9
CPM F-20
CPM F-30
Tab. 8.4:
Recommended flow rate
For the maximum laser power in case of a fixed flow rate the following rule is applicable:
Flow rate multiplied by 1.4 = maximum laser power. For 5 l/min this equals about 7 kW.
This calculation serves to prevent a possible overload.
Typical flow rates and temperature rises for the highest measurement accuracy can be found in Tab. 8.5 on
page 22.
8
9.55
12
11
10.42
10
11.46
9
12.74
8
14.33
7
16.38
19.11
6
5
22.93
Tab. 8.5:
Flow rates/temperature rise/beam power - a linear extrapolation up to 20 kW is possible
22
Flow rate in l/min
0.5
4
8
15
Flow rate in l/min
1.5 – 2
8 – 11
15 – 22
25 – 35
7
6
5
8.36
7.17
5.97
9.12
7.82
6.51
10.03
8.60
7.17
11.15
9.55
7.96
12.54
10.75
8.96
14.33
12.28
10.24
16.72
14.33
11.94
20.06
17.20
14.33
Beam power in kW
4
3
2
4.78
3.58
2.39
5.21
3.91
2.61
5.73
4.30
2.87
6.37
4.78
3.18
7.17
5.37
3.58
8.19
6.14
4.09
9.55
7.17
4.78
11.46
8.60
5.73
Temperature rise in °C
CompactPowerMonitor CPM
1,5
1
0,5
1.79
1.19
0.60
1.95
1.30
0.65
2.15
1.43
0.72
2.39
1.59
0.80
2.69
1.79
0.90
3.07
2.05
1.02
3.58
2.39
1.19
4.30
2.87
1.43
Revision 02/2019 EN
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