Environmental specifications
For additional information about environmental measurements for specific system configurations,
see Dell.com/environmental_datasheets. Table 24 details the environmental specifications for the
M820.
Fresh Air: temperature, humidity, altitude de-rating
Continuous
10°C to 35°C (50°F to 95°F) at 10% to 80% relative humidity with 26°C (78.8°F) maximum
operation
dew point (maximum wet bulb temperature). De-rate maximum allowable dry bulb
temperature at 1°C per 300 m above 950 m (1°F per 547 ft above 3117 ft).
Expanded
When operating in the expanded temperature range, system performance may be impacted,
operation
and ambient temperature warnings may be reported on the LCD and in the System Event
Log.
≤ 10% of annual operating hours: 5°C to 10°C and 35°C to 40°C (with no direct sunlight on
the equipment) at 5% to 85% relative humidity with 26°C dew point (maximum wet bulb
temperature). Outside the standard operating temperature (10°C to 35°C), the system can
operate down to 5°C or up to 40°C for a maximum of 10% of its annual operating hours. For
temperatures between 35°C and 40°C (95°F to 104°F), de-rate maximum allowable dry bulb
temperature by 1°C per 175 m above 950 m (1°F per 319 ft above 3117 ft).
≤ 1% of annual operating hours: −5°C to 5°C and 40°C to 45°C (with no direct sunlight on
the equipment) at 5% to 90% relative humidity with 26°C dew point (maximum wet bulb
temperature). Outside the standard operating temperature (10°C to 35°C), the system can
operate down to −5°C or up to 45°C for a maximum of 1% of its annual operating hours. For
temperatures between 40°C and 45°C (104°F to 113°F), de-rate maximum allowable dry bulb
temperature by 1°C per 125 m above 950 m (1°F per 228 ft above 3117 ft).
Expanded operation restrictions:
No cold startup below 5°C
Install only 87 mm wide heat sinks
Do not install more than 40 DIMMs
Temperature
Operating
See Fresh Air for temperature information
o
Storage
−40
C to 65
Relative humidity
Operating
See Fresh Air for relative humidity information
Storage
5% to 95% at a maximum wet bulb temperature of 33°C (91°F); atmosphere must be
non-condensing at all times
Maximum vibration
Operating
0.26 Grms at 5Hz to 350Hz for 15 minutes
Storage
1.54 Grms at 10Hz to 250Hz for 15 minutes
PowerEdge M820 Technical Guide
41
Table 24.
Environmental specifications
o
o
o
C (−40
F to 149
F) with a maximum temperature gradation of 20
o
C per hour
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