Examining The Installation Site; Temperature/Humidity; Cleanliness - HP FlexNetwork 5120 SI Series Installation Manual

Examining the installation site

The switch must be used indoors. You can mount your switch in a rack or on a workbench, but make
sure:

Adequate clearance is reserved at the air inlet and outlet vents for ventilation.

The rack or workbench has a good ventilation system.

The rack is sturdy enough to support the switch and its accessories.

The rack or workbench is reliably grounded.
To ensure correct operation and long service life of your switch, install it in an environment that meets
the requirements described in the following subsections.

Temperature/humidity

Maintain temperature and humidity in the equipment room in the acceptable range.

Lasting high relative humidity can cause poor insulation, electricity creepage, mechanical
property change of materials, and metal corrosion.

Lasting low relative humidity can cause washer contraction and ESD and bring problems
including loose captive screws and circuit failure.

High temperature can accelerate the aging of insulation materials and significantly lower the
reliability and lifespan of the switch.
For the temperature and humidity requirements, see
specifications."

Cleanliness

Dust buildup on the chassis might result in electrostatic adsorption, which causes poor contact of
metal components and contact points, especially when indoor relative humidity is low. In the worst
case, electrostatic adsorption can cause communication failure.
Table 3 Dust concentration limit in the equipment room
Substance
Dust
NOTE:
Dust diameter ≥ 5 μm
The equipment room must also meet limits on salts, acids, and sulfides to eliminate corrosion and
premature aging of components, as shown in
Table 4 Harmful gas limits in the equipment room
Gas
SO
2
H S
2
NH
3
Cl
2
Concentration limit (particles/m³)
≤ 3 x 10
4
(no visible dust on the tabletop over three days)
Table
2
"Appendix A Chassis views and technical
4.
Maximum concentration (mg/m
0.2
0.006
0.05
0.01
3
)