Sampling flow control system for particulate matter monitor, particulate matter monitor and method and device for controlling gas flow

The invention relates to a sampling flow control system for a particulate matter monitor, the particulate matter monitor and a method and device for controlling gas flow. The sampling flow control system for the particulate matter monitor comprises a main gas circuit pipe which is provided with a first end and a second end, and the second end is used for connecting with a sucking pump; a samplinggas circuit pipe which is connected with the first end; an adjusting gas circuit pipe which is connected with the first end; a measuring unit which is arranged on the sampling gas circuit pipe and isused for measuring the gas flow of the sampling gas circuit pipe; and an adjusting unit which is arranged on the adjusting gas circuit pipe and is used for adjusting the gas flow of the sampling gascircuit pipe by adjusting the gas flow of the adjusting gas circuit pipe. According to the sampling flow control system for the particulate matter monitor, the sampling flow of the particulate mattermonitor can be adjusted to th