Cleanliness; Corrosive Gas Limit - HP FlexNetwork 5140 EI Series Installation Manual

Cleanliness

Dust buildup on the chassis might cause electrostatic adsorption and dust corrosion, resulting in
poor contact of metal connectors and contact points. This might shorten the device's lifetime and
even cause device failure in the worst case.
equipment room.
Table 2 Dust concentration limits in the equipment room
Substance
Dust particles
Dust particles
Dust (suspension)
Dust (sedimentation)
Sand
To maintain cleanliness in the equipment room, follow these guidelines:
•
Keep the equipment room away from pollution sources. Do not smoke, eat, or drink in the
equipment room.
•
Use double-layer glass in windows and seal doors and windows with dust-proof rubber strips.
Use screen doors and window screens for doors and windows open to the outside and make
sure the external windows are air tight.
•
Use dustproof materials for floors, walls, and ceilings and use wallpaper or matt paint that does
not produce powders.
•
Clean the equipment room regularly and clean the air filters of the rack each month.
•
Wear ESD clothing and shoe covers before entering the equipment room, keep the ESD
clothing and shoe covers clean, and change them frequently.

Corrosive gas limit

Corrosive gases can accelerate corrosion and aging of metal components. Make sure the corrosive
gases in the equipment room do not exceed the concentration limits as shown in
Table 3 Corrosive gas concentration limits in the equipment room
Gas
SO
2
H S
2
Cl
2
HCI
HF
NH
3
O
3
NO
X
Table 2
Particle diameter
≥ 0.5 µm
≥ 5 µm
≤ 75 µm
75 µm to 150 µm
≥ 150 µm
Average concentration (mg/m3)
0.3
0.1
0.1
0.1
0.01
1.0
0.05
0.5
3
describes the dust concentration limits in the
Concentration limit
≤ 3.5 × 106 particles/m3
≤ 3 × 104 particles/m3
≤ 0.4 mg/m3
≤ 15 mg/(m2h)
≤ 300 mg/m3
Maximum concentration (mg/m3)
1.0
0.5
0.3
0.5
0.03
3.0
0.1
1.0
Table 3.