Nanchang luoyang east road urban comprehensive reconstruction project pipe gallery project.

A gas monitoring detector was used to monitor the concentration of hydrogen sulfide gas in the pipe gallery， When oxygen concentration is below or toxic and combustible gas concentration reaches the set threshold , the system will automatically send an alarm message to remind the management personnel to avoid the occurrence of poisoning and explosion accidents, so as to ensure the safety of the staff and the normal operation of the facilities in the pipe gallery.

When the methane gas reaches the serious standard, no matter what the alarm value of other gases is, the ventilation system in the pipe gallery must be in a closed state, so as not to play the role of supporting combustion. Fan and gas alarm control system to achieve linkage ,according to the real-time situation of gas content in the pipe gallery, remote automatic control or forced start of the fan. Start the fan when oxygen is insufficient; When the harmful gas exceeds the standard, the fan is started.Note that the fan should not be started when fire alarm occurs.