4
Classes of external effects
– excerpt from ČSN 33 2000-5-51 ed. 3.
Class:
1) AC1
– elevation above sea level ≤ 2000 m
2) AD5
– splashing water in all directions
AD7
– water occurrence – shallow dipping
3) AE4
– medium dustiness
AE6
– strong dustiness
(MPSPED only)
4) AF2
– occurrence of corrosive or polluting substances from atmosphere. Presence of corrosive polluting substances
is significant.
5) AG2
– medium mechanical stress by impacts – common industrial processes
6) AH2
– medium mechanical stress by vibrations – common industrial processes
7) AK2
– serious risk of growth of vegetation and moulds
8) AL2
– serious danger of the occurance of animals
(insects, birds, small animals)
9) AM-2-2 – normal level of the signal voltage. No additional requirements.
10) AN2
– medium solar radiation with intensities > 500 and ≤ 700 W / m
2
11) AP3
– medium seismic effects; acceleration > 300 Gal ≤ 600 Gal
12) BA4
– personal abilities. Instructed people.
13) BC3
– frequent contact with the earth potential. Persons coming frequently into contat with “live” parts orstanding
on a conducting base.
Operating position
The actuators can operate in any operating position.
3. OPERATION MODE, SERVICE LIFE OF ACTUATORS
Operation mode
The actuators can be operated with the type of loading S2 according to ČSN EN 60 034-1. The run period
at tempe50 °C is 10 minutes; the mean value of loading torque should not exceed 60 % of the value
of maximum tripping torque M
v
.
The actuators can also work in the regime S4
(interrupted run with start-up)
according to ČSN EN 60 034-1.
Corrosion protection
Actuators are standardly delivered with surface treatment corresponding to category of corrosion aggressiveness
C1, C2 and C3 according to ČSN EN ISO 12944-2.
On customer's request is possible to do surface treatment correcponding to category of corrosion aggressiveness
C4, C5-I and C5-M.
In following table is provided and overview of environment for each categories of corrosion aggressiveness accor-
ding to ČSN EN ISO 12944-2.
Corrosion
aggressiveness
level
Example of typical environment
Outdoor
Indoor
C1
Heated buildings with clean atmosphere
(very low)
e.g. offices, shops, schools, hotels.
C2
Atmosphere with low level of pollution.
Unheated buildings, in which may occur
(low)
Mostly outdoor areas.
condensation, e.g. stocks, sports halls.
C3
Urban industrial atmospheres,
Production areas with high humidity and low air
(middle)
mild pollution of sulfur dioxide.
pollution, e.g. food industry, processing
Seaside areas with middle salinity.
factories, breweries.
C4
Industrial areas and seaside areas
Chemical plants, swimming pools,
(high)
with middle salinity.
seaside shipyard.
C5-I
(very high
Industrial areas with high humidity
Buildings or areas with predominantly continuous
– industrial)
and aggressive atmosphere.
condensation and high air pollution.
C5-M
(very high
Seaside areas with high salinity.
Buildings or areas with predominantly
– seaside)
continuous condensation and high air pollution.
