Background:

Along with the reform and opening up, the improvement of the market economic system, and the vigorous development of the economy of individual and private enterprises in the region, a large number of "three-in-one" commercial places with accommodation, production, processing and operation sites mixed in the same building have been produced nationwide. Such places have relatively small scale, low operating costs, simple conditions and poor fire safety conditions. But the fire accident is frequent, heavy casualties, staggering losses, has more and more aroused the wide attention of the community.

Problems existing in the management of small and micro places:

(1). Serious fire hazards

Some small places have relatively low fire resistance rating, poor evacuation conditions and lack of perfect fire protection facilities. At the same time, some people have placed a large number of combustible materials in the place.

(2). Electrical wiring is not standardized

Small places are densely populated with personnel and more electrical equipment, and some small places do not lay electrical lines and install electrical equipment in strict accordance with fire regulations.

(3). The lack of personnel supervision: Supervision and management are mainly the above-door inspection, and there is a large number of small places, so it needs a large number of personnel and enough time. Usually, there are few fire supervision and management personnel in brigades, which cannot support door-to-door inspection and supervision, which leads to many problems in fire safety in many small and micro sites.

(4). Lack of fire awareness

Some owners of small-scale sites pursue excessively economic benefits and lack of fire awareness, neglecting fire safety issues and failing to keep fire regulations in mind.

Types of sensors that may be used in the environment:

No.	Model	Product     name	Detection  gas	Detection   range	Picture	Application
1	MQ2-CO-14*14	CO sensor	CO	0-1000ppm(max 2000 ppm)		Widely used in commercial especially civil field for CO concentration monitoring
2	MQ-D4B	CH4 sensor	CH4	300-10000ppm		1. Combustible gas leak monitoring devices and fire/safety detection systems for households, factories, and commercial use 2. Combustible gas leak alarm and gas leak detector.
3	MQ-G5	C3H8 sensor	C3H8	100-10000PPM		For alarm, monitor or detector of natural gas, liquefied petroleum gas and town gas.
4	GM502B	VOC gas sensor	VOC	1PPM-500PPM		1.Indoor air quality monitoring, mobile phones, computers and other consumer electronic products to detect air quality 2.Exhaled gas detector 3.Indoor smoke alarm