Hikvision DS-7604NI-M1/4P User Manual

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Reason

1. The audio input device does not have a good eect in sound collecon.

2. Interference in transmission.

3. The audio parameter is not properly set.

Soluon

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

electromagnec interference.

3. Adjust the audio volume according to the environment and audio input device.

24.4 Nocaon for Corrosive Gas

In non-data center room, the corrosive gas concentraon limit is recommended to meet the

requirements of the chemical acve substance 3C2 level in IEC 60721-3-3:2002.

Table 24-1 Corrosive Gas Concentraon Limit

Corrosive Gas Category Average Value (mg/m

) Max. Value (mg/m

)

(Sulfur Dioxide) 0.3 1.0

S (Hydrogen Sulde) 0.1 0.5

(Chlorine) 0.1 0.3

HCl (Hydrogen Chloride) 0.1 0.5

HF (Hydrogen Fluoride) 0.01 0.03

(Ammonia) 1.0 3.0

(Ozone) 0.05 0.1

(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 concentraon of corrosive gases

exceed the average value.

●

The maximum value refers to the limit or peak value. The duraon for the corrosive gas

concentraon to reach the maximum value should not exceed 30 minutes per day.

Network Video Recorder User Manual

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Hikvision DS-7604NI-M1/4P 4-ch 1U 4K NVR