With the popularization of urban motor vehicles and the decreasing number of above ground parking spaces, the construction of underground parking lots has become an important measure to solve this problem. With the increasing number of underground parking lots, the accompanying air quality issues still attract attention. Carbon monoxide gas (CO), as a colorless and odorless toxic gas, has frequently caused poisoning incidents with the popularity of private cars and underground garages. In recent years, the country has also begun to require carbon monoxide detection systems for underground parking lots. The "National Green Building Design Standards" stipulate that "underground parking lots with mechanical ventilation should monitor and control CO concentration in real time

The production of carbon monoxide in underground garages mainly comes from car engines. When the engine is idling, due to insufficient combustion of gasoline, a large amount of carbon monoxide is producedCOThe exhaust gas. Underground parking lots are enclosed environments where vehicles frequently enter and exit, and the exhaust emissions are not easily released, making it easy to accumulate a large amountCOGas causes a pungent odor to pervade the parking lot, damaging people's physical health. If the gas concentration is too high, it can even cause fires and explosions.

Carbon monoxide is colorless, odorless, and tasteless, which can cause significant harm to the human body when inhaled. It combines with hemoglobin to produce carboxyhemoglobin, leading to hypoxia in humans. Common symptoms of carbon monoxide poisoning, such as headaches,Vomiting, dizziness, fatigue, and weakness can cause severe damage to the heart and central nervous system when exposed to carbon monoxide, leading to sequelae.

Carbon monoxide concentration:

reach, achieve, attain50ppmHealthy adults can bear it8Hour;

reach, achieve, attain200ppmWhen it comes to healthy adults2～3After hours, mild headache and fatigue;

reach, achieve, attain400ppmWhen it comes to healthy adults1～2Frontal pain within hours,3Threatening life after hours;

reach, achieve, attain800ppmWhen it comes to healthy adults45Within minutes, blurred visionSpasms,2Losing consciousness within an hour,2～3Died within an hour.

Solution

Install gas online monitoring system：Gas alarm controller MIC1000+Gas detection alarm MIC600

The purpose of installing an online gas monitoring system is to:

1）Personal safety: Real time monitoring of ambient air and regular ventilation to ensure that the concentration of carbon monoxide in the garage is below hazardous levels.

2）Environmental protection and energy conservation: Set an alarm value based on the concentration of carbon monoxide in the underground garage, link the fan, and avoid energy waste caused by excessive exhaust frequency.

Monitoring location: on the rear wall and pillar of the vehicle

Monitoring factor: Carbon monoxide（CO）Carbon dioxide（CO2）Oxygen（O2）

Data transmission: wired or wireless transmission

1）Wired transmission: Gas detection alarm device passes through4-20mACurrent signal orRS485The bus based digital signal is transmitted to the gas alarm controller and then converted intoRS232Signal, transmitted to computer terminal;

2）Wireless transmission: Gas detection alarm device passes throughRTU433orGPRSWireless transmission of data to the gas alarm controller, and then throughInternetNetwork, wireless transmission to computer terminals.