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Fig. 3.7. Thermosleeve B wrapped around the cables and hoses (effectively two additional layers).
Fig. 3.8. Pyrojacket pulled over the cables and hoses and sealed to camera housing with Kapton tape.
Table 3.1 shows the effect of insulating the camera in addition to the cables. In this test recirculating
chiller cooling (see Section 3.6.3 for more details) was applied.
Table 3.1. Measured temperatures for insulated cables without/with insulated camera.
Temperature
Only cables insulated
Cables and camera insulated
Ambient (
°C
)
290
290
Camera body top side (
°C
)
80
52
Camera body bottom side (
°C
)
64
43
Cables (
°C
)
76
67
Camera (
°C
)
47
39
Cooling liquid (
°C
)
25
25
3.3
Condensation
Condensation occurs whenever there is humidity in air and the temperature of an object falls below the
dew point. Condensation must be avoided since it can damage the welding camera. Condensation can be
prevented by keeping the cooling medium (air or liquid) temperature above the dew point. Usually
temperatures around 25
…30
°C are safe in this respect. However, in exceptionally humid and warm
environments even higher cooling medium temperatures may need to be applied. Figure 3.9 shows the
dependence of dew point on ambient temperature and relative humidity in normal pressure.