17.9 Environmental conditions and tests
Table 397: Environmental conditions
Description Value
Operating temperature range -25...+55ºC (continuous)
Short-time service temperature range -40...+70ºC (<16h)
Note: Degradation in MTBF and HMI performance
outside the temperature range of -25...+55ºC
Relative humidity <93%, non-condensing
Atmospheric pressure 12.47...15.37 psi (86...106 kPa)
Altitude up to 6561.66 feet (2000 m)
Transport and storage temperature range -40...+85ºC
Table 398: Environmental tests
Description Type test value Reference
Cold tests operation
storage
96 h at -25ºC
16 h at -40ºC
96 h at -40ºC
IEC 60068-2-1/ANSI
C37.90-2005 (chapter 4)
Dry heat tests operation
storage
16 h at +70ºC
96 h at +85ºC
IEC 60068-2-2/ANSI
C37.90-2005 (chapter 4)
Damp heat tests steady state
cyclic
240 h at +40ºC
humidity 93%
6 cycles at +25 to +55ºC
humidity 93...95%
IEC 60068-2-78
IEC 60068-2-30
Section 17 1MRK 505 277-UUS C
Technical data
454
Technical Manual
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