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Temperatures of touchable hot surfaces
BS EN 13202:2000 gives the recommended maximum surface
temperatures for different materials at various exposure times (see
below). Your Ultrawave ultrasonic bath can be set so that the cleaning
fluid is up to 70°C. This means that parts of ultrasonic bath will be above
the recommended maximum temperature.
If you operate your ultrasonic bath at temperatures above the
recommended maximum, the Ultrawave advise that you conduct a risk
assessment, and if appropriate fix a “Caution – Hot” warning label to your
machine.
The following limit values are based on the harmonised standards –
-
BS EN 13202:2000 Ergonomics of the thermal environment –
Temperatures of touchable hot surfaces – Guidance for establishing
surface temperature limit values in production standards with the
aid of
-
EN 563: 1994 Safety of machinery – Temperature of touchable
surfaces
-
Ergonomics data to establish temperature limit values for hot
surfaces
Material/time-temp*
1 sec
4 sec
10 sec 10 min
8 hr
Uncoated metals
65°C
58°C
55°C
48°C
43°C
Painted metals
83°C
64°C
55°C
48°C
43°C
Enamelled metals
74°C
60°C
56°C
48°C
43°C
Ceramics, glass, stone
80°C
70°C
66°C
48°C
43°C
Plastics
85°C
74°C
70°C
48°C
43°C
Wood
110°C
93°C
89°C
48°C
43°C
Time
Contact
Part
1 sec
Accidental contact
Outer case, tank flange
4 sec
Parts held for short periods
Knobs, switches
10 sec
Parts continuously held in normal use
Handles
10 min
Prolonged use
Handles
8 hr
Continuous
Handles
