HPNetwork MSR958 (JH300A) - Инструкция по эксплуатации - Страница 7

3 

Table 3 Dust concentration limit in the equipment room 

Substance 

Concentration limit (particles/m

3

) 

Dust particles 

≤

 3 x 10

4

(No visible dust on the tabletop in three days) 

NOTE: 

Dust 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 4

. 

Table 4 Harmful gas limits in an equipment room 

Gas 

Maximum concentration (mg/m

3

) 

SO

2

 0.2 

H

2

S 0.006 

NH

3

0.05 

Cl

2

0.01 

Cooling 

•

Maintain a minimum clearance of 10 cm (3.94 in) around the air vents. 

•

Make sure the installation site has a good ventilation system. 

EMI 

All electromagnetic interference (EMI) sources, from outside or inside of the router and application 
system, adversely affect the router in the following ways: 

•

A conduction pattern of capacitance coupling. 

•

Inductance coupling. 

•

Electromagnetic wave radiation. 

•

Common impedance (including the grounding system) coupling. 

To prevent EMI, perform the following tasks:  

•

If AC power is used, use a single-phase three-wire power receptacle with protection earth (PE) 
to filter interference from the power grid.  

•

Keep the router far away from radio transmitting stations, radar stations, and high-frequency 
devices.  

•

Use electromagnetic shielding, for example, shielded interface cables, when necessary. 

Lightning protection 

To protect the router from lightning, follow these guidelines: 

•

Make sure the router is reliably grounded by using a grounding cable. 

•

Make sure the AC power receptacle is reliably grounded. 

•

Install a lightning protector at each power input end.