Siemens Simatic CFU Commissioning Manual page 136

Technical specifications
12.1 General technical specifications
Ambient condi‐ Permitted range
tions
Air pressure
● From 1080 hPa
(corresponds to a
depth of
approximately
-1000 m)
● Up to 606 hPa
(corresponds to a
height of
approximately
4000 m)
Relative humidi‐ From 10 to 95%
ty Max. 95% at +25 °C
Contaminant
● SO
concentration
● RH: <60%, no
condensation
● H
2
● RH: <60%, no
condensation
ISA-S71.04
severity level G1; G2;
G3
Observe the information on installation in an enclosure and the following table on derating. Use in Ex Zone 2/22 only
1)
permitted at elevations up to 2000 m.
Derating
The cooling effect of air is reduced at higher altitudes due to lower density.
The table shows the derating factor for the maximum permissible ambient temperature as a
function of device use at an altitude above sea level.
Table 12-8
Altitude above sea level
(-1000 m) to 2000 m
3000 m
4000 m
Maximum permissible ambient temperature in °C for 2000 m
1)
136
Remarks
The density of air decreases with increasing altitude. The cooling effect of air in
accordance with the elevation is shown in the following table on derating.
No condensation, corresponds to relative humidity (RH) exposure level 2 ac‐
cording to IEC 61131 Part 2
Test: 10 ppm; 4 days
: <0.5 ppm
2
Test: 1 ppm; 4 days
S: <0.1 ppm
Derating when devices are used at an altitude above sea level
Derating factor for ambient temperature
1.0
0.9
0.8
Commissioning Manual, 07/2018, A5E39252870-AC
1)
1)
SIMATIC CFU