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DGS-8000 Series Hardware Installation Guide Chapter 2 Preparation before Installation
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2.2.3
Temperature and Humidity
Requirements
To ensure the normal operation and a prolonged use life of the DGS-8000, you must
maintain an appropriate temperature and humidity in the equipment room.
Too high or low temperature and humidity for a long period of time may damage the
equipment.

In an environment with high relative humidity, the insulating material may have bad
insulation or even leak electricity, and sometimes the materials may suffer from
mechanical performance change and metallic parts may get rusted.
 On the other hand, in an environment with low relative humidity, the insulating strip may
dry and shrink, and static electricity may occur easily and endanger the circuit on the
equipment.
 In an environment with high temperature, the equipment is subjected to even greater
harm, as its performance may degrade significantly and its useful life may be shortened
in the case of long-term exposure that expedites the aging process.
Therefore, the ambient temperature and humidity of the DGS-8000 equipment must meet
the requirements listed in Table 2-1:
Table 2-1Temperature and humidity requirements of the DGS-8000
Temperature Relative Humidity
0ºC-50ºC 10%-90%
Note: The ambient temperature and humidity are measured at the point that is 1.5m above
the floor and 0.4m before the equipment when there is no protective plate in front or back of
the equipment rack.
2.2.4
Cleanness Requirements
Dust poses the top threat to the running of the equipment. The indoor dust falling on the
equipment may be adhered by the static electricity, causing bad contact of the metallic joint.
Such electrostatic adherence may occur more easily when the relative humidity is low, not
only affecting the use life of the equipment, but also causing communication faults. Table 2-2
shows the requirements for the dust content and granularity in the equipment room.
Table 2-2 Requirements for the dust content and granularity in the equipment room
Maximum diameter ( μ m) 0.5 1 3 5
Maximum density
(Particles/m
3
)
1.4 x 10 7 x 10 2.4 x 10 1.3 x 10
Note: The air filter of the DGS-8000 must be cleaned at interval to ensure good ventilation
and dust prevention.
Apart from dust, the salt, acid and sulfide in the air in the equipment room must also meet
strict requirements; as such poisonous substances may accelerate the corrosion of the
metal and the aging of some parts. The equipment room should be protected from the
intrusion of harmful gases (for example, sulfur dioxide, sulfured hydrogen, nitrogen dioxide,
and chlorine), whose requirements are listed in Table 2-3.
Table 2-3 Requirements for harmful gases in the equipment room
Gas Average (mg/m
3
) Maximum (mg/m
3
)
Sulfur dioxide 0.2 1.5