Specifications

Environmental Requirements
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Environmental Requirements
The SGI Origin 3900 system operates in typical conditions for digital devices that are
marketed for commercial and scientific environments. The air-conditioning system at
your facility must ensure that the intake air to each SGI Origin 3900 system meets the
requirements in Table 6-1. SGI strongly recommends that you adhere to the
recommended operating ranges to minimize component failures.
Each system cabinet receives intake air through the front of the cabinet and exhausts
heated air through the back of the cabinet. When you install the system, ensure that
heated air from other equipment does not discharge toward the air intakes of any system
cabinets. The equipment can overheat if heated air enters the front intake of any system.
Refer to Table 6-1 for the environmental requirements for the Origin 3900 system.
Table 6-1 System Environmental Requirements (Maximum)
Characteristic Specification
Temperatures:
a
Operating 0 to 5,000 ft (0 to 1524 m)
b
41 to 95 °F (5 to 35 °C)
Operating 5,000 to 10,000 ft (1524 to 3048 m)
b
41 to 86 °F (5 to 30 °C)
Nonoperating -40 to 140 °F (-40 to 60 °C)
Maximum Thermal Gradient 18 °F (10 °C) per hour
Relative Humidity:
a
Operating 10% to 95% noncondensing
Nonoperating 10% to 95% noncondensing
Maximum Humidity Gradient 10% relative humidity per hour
Altitude:
Operating 0 to 10,000 ft (0 to 3048 m)
Nonoperating 0 to 40,000 ft (0 to 12192 m)
a
SGI recommends an operating temperature of 72 °F (22 °C) and a relative humidity of 50%
noncondensing.
b
Temperature sensors in each Origin 3900 system automatically power down the system when the intake
temperature reaches 104 °F (40 °C) or if internal electronics reach an unsafe operating temperature.