Temperature And Humidity - Digitalchina Networks DCS-3950 series Manual

threshold value.
Gas
SO
H
2
NO
NH
Cl

2.1.1.2 Temperature and Humidity

As the switch is designed to no fan, it's physical heat-away ,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 is shown below:
Temperature:
Long term condition
15 ~ 30°C
Table 2-3 Environmental Requirements: Temperature and Humidity
Caution!
A sample of ambient temperature and humidity should be taken at 1.5m above the
floor and 0.4m in front of the switch rack, with no protective panel covering the front and
rear of the rack.
Short term working conditions refer to a maximum of 48 hours of continued operation
and an annual cumulative total of less than 15 days. Formidable operation conditions
refers to the ambient temperature and relative humidity value that may occur during an
air-conditioning system failure, and normal operation conditions should be recovered
within 5 hours.
Average (mg/m³)
2
S
2
3
2
Table 2-2 Environmental Requirements: Particles
Short term condition
0 ~ 50°C
DCS-3950 series Ethernet switch manual
0.2
0.006
0.04
0.05
0.01
Long term condition
40 ~ 65%
Max (mg/m³)
1.5
0.03
0.15
0.15
0.3
Relative humidity
Short term condition
10 ~ 95%
11