Table 2 Temperature requirements

Item

Temperature

Operating temperature

0°C to 45°C (32°F to 113°F)

 

 

Storage temperature

–40°C to +70°C (–40°F to +158°F)

 

 

Humidity

Maintain appropriate humidity in your equipment room, as described in Table 3.

•Lasting high relative humidity tends to cause poor insulation, electricity creepage, mechanical property change of materials, and corrosion of metal parts.

•Lasting low relative humidity is likely to result in loose screws due to washer contraction, and even ESD, which causes the circuits to fail.

Table 3 Humidity requirements

Item

Humidity

Operating humidity (noncondensing)

10% to 95%

 

 

Storage humidity (noncondensing)

5% to 95%

 

 

Altitude

Table 4 Altitude requirements

Item

Altitude

Operating altitude

–60 m (–196.85 ft) to 4 km (2.49 miles)

 

 

Storage altitude

–60 m (–196.85 ft) to 4.5 km (2.80 miles)

 

 

Cleanness

Dust buildup on the chassis might result in electrostatic adsorption, which causes poor contact of metal components and contact points, especially when indoor relative humidity is low. In the worst case, electrostatic adsorption can cause communication failure.

Table 5 Dust concentration limit in the equipment room

Substance

Concentration limit (particles/m3)

Dust particles

≤ 3 x 104

(No visible dust on desk in three days)

 

 

 

NOTE:

Dust particle diameter ≥ 5 μm

The equipment room must also meet strict limits on salts, acids, and sulfides to eliminate corrosion and premature aging of components, as shown in Table 6.

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