Cleanliness Requirements - Ruijie HA3515-DG Hardware Installation And Reference Manual

Hardware Installation and Reference Guide
electricity may occur easily and endanger the circuit on the equipment.
In an environment with high temperature, the equipment is subject to even greater harm, as its

performance may degrade significantly and various hardware faults may occur.
Therefore, the ambient temperature and humidity of the HA3515-DG must meet the requirements listed
in Table 2-1:
Table 2-1 Requirements for Temperature and Humidity
Temperature
0ºC-40ºC (32℉-104℉)

Cleanliness Requirements

2.5.4
Dust poses a major threat to the device. The indoor dust takes on a positive or negative static electric
charge when falling on the device, causing poor contact of the metallic joint. Such electrostatic adhesion
may occur more easily when the relative humidity is low, not only affecting the service life of the device,
but also causing communication faults. Table 2-2 describes the requirements for the dust content and
granularity in the equipment room.
Table 2-2 Requirements for Dust
Maximum Diameter (μm)
Maximum Density
(Particles/m )
3
Apart from dust, the salt, acid, and sulfide in the air in the equipment room must meet strict
requirements. These harmful substances will accelerate metal corrosion and component aging.
Therefore, the equipment room should be properly protected against the intrusion of harmful gases,
such as sulfur dioxide, hydrogen sulfide, nitrogen dioxide, and chlorine gas. Table 2-3 lists limit values
for harmful gases.
Table 2-3 Requirements for Gases
Gas
Sulfur dioxide (SO
Hydrogen sulfide (HS)
Nitrogen dioxide (NO
Ammonia gas (NH
Chlorine gas (CI
0.5
1.4×10
Average (mg/m
) 0.2
2
0.006
) 0.04
2
) 0.05
3
) 0.01
2
Relative Humidity
5%-95%
1
7×10
7 5
)
3
8
Preparing for Installation
3 5
2.4×10 1.3×10
5
Maximum (mg/m )
3
1.5
0.03
0.15
0.15
0.3
5