QTech QSW-8200 series, Руководство пользователя

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User Manual
Chapter 2. Hardware Installation 20
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In addition, salt, acid and sulfide in the air are also harmful to the switch. Such harmful gases
will aggravate metal corrosion and the aging of some parts. The site should avoid harmful
gases, such as SO
2
, H
2
S, NO
2
, NH
3
and Cl
2
, etc. The table below details the threshold value.
Gas Average (mg/m³) Max (mg/m³)
SO
2
0.2 1.5
H
2
S 0.006 0.03
NO
2
0.04 0.15
NH
3
0.05 0.15
Cl
2
0.01 0.3
Table 2-2 Environmental Requirements: Particles
2.1.1.2
Temperature and Humidity
Although the switch is designed to use 4 fans, the site should still maintain a desirable
temperature and humidity. High-humidity conditions can cause electrical resistance
degradation or even electric leakage, degradation of mechanical properties and corrosion of
internal components. Extreme low relative humidity may cause the insulation spacer to
contract, making the fastening screw insecure. Furthermore, in dry environments, static
electricity is liable to be produced and cause harm to internal circuits. Temperature extremes
can cause reduced reliability and premature aging of insulation materials, thus reducing the
switch’s working lifespan. In the hot summer, it is recommended to use air-conditioners to cool
down the site. And the cold winter, it is recommenced to use heaters.
The recommended temperature and humidity are shown below:
Temperature: Relative humidity
Long term
condition
Short term
condition
Long term
condition
Short term
condition
15 ~ 30°C 0 ~ 50°C 40 ~ 65% 10 ~ 95%
Table 2-3 Environmental Requirements: Temperature and Humidity