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Reason
1. The audio input device does not have a good eect in sound collecon.
2. Interference in transmission.
3. The audio parameter is not properly set.
Soluon
1. Check if the audio input device is working properly. You can change another audio input device,
and try again.
2. Check the audio transmission line. Ensure all lines are well connected or welded, and there is no
electromagnec interference.
3. Adjust the audio volume according to the environment and audio input device.
24.4
Nocaon for Corrosive Gas
In non-data center room, the corrosive gas concentraon limit is recommended to meet the
requirements of the chemical
acve substance 3C2 level in IEC 60721-3-3:2002.
Table 24-1 Corrosive Gas Concentraon Limit
Corrosive Gas Category Average Value (mg/m
3
) Max. Value (mg/m
3
)
SO
2
(Sulfur Dioxide) 0.3 1.0
H
2
S (Hydrogen Sulde) 0.1 0.5
Cl
2
(Chlorine) 0.1 0.3
HCl (Hydrogen Chloride) 0.1 0.5
HF (Hydrogen Fluoride) 0.01 0.03
NH
3
(Ammonia) 1.0 3.0
O
3
(Ozone) 0.05 0.1
NO
X
(Nitrogen Oxides) 0.5 1.0
Note
●
The average values in the table above are typical control limits for corrosive gases in the machine
room environment. In general, it is not recommended that the concentraon of corrosive gases
exceed the average value.
●
The maximum value refers to the limit or peak value. The
duraon for the corrosive gas
concentraon to reach the maximum value should not exceed 30 minutes per day.
Network Video Recorder User Manual
97
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