Methane and non methane total hydrocarbon detection

Specialized gas chromatographGC-7900

1. Definition:

Non methane total hydrocarbons (NMHC) typically refer to all volatile hydrocarbons other than methane, also known as non methane total hydrocarbons. When the concentration of NMHC in the atmosphere exceeds a certain level, it is harmful to human health and can also produce chemical smoke, causing harm to the environment and humans.

2. Testing standards:

The factory boundary concentration standard for non methane total hydrocarbons in China's "Comprehensive Emission Standards for Air Pollutants" (GB16927-1996) is 0.05mg/m3
According to the fourth edition of the "Air and Waste Gas Monitoring Methods", the GC-7900 gas chromatograph adopts a single FID detection process with a ten way valve injection and dual column parallel connection, effectively eliminating measurement errors caused by differences in FID sensitivity during dual FID analysis. It meets the detection requirements for total hydrocarbons and non methane total hydrocarbons in the air, with a minimum detection concentration of 0.05mg/m3; And only one injection is needed to analyze both total hydrocarbons and non methane total hydrocarbons simultaneously. An automatic sampling and injection system can be optionally selected, as well as automatic online analysis. Please call to explain when placing an order.

3. GC-7900Instrument Introduction:

● Operation display:192×64Dot matrix LCD, large screen Chinese display.

●Adopting a microcomputer automatic ignition device.

●Stable and reliable digital zeroing is adopted to avoid baseline instability caused by potentiometer zeroing.

Equipped with a ten way valve injection structure system, specifically designed for the detection of non methane total hydrocarbons, it features a parallel installation of two chromatography columns and a highly sensitive FID detector specifically designed for total hydrocarbon analysis.The single FID detection process effectively eliminates measurement errors caused by differences in FID sensitivity during dual FID analysis, meeting the detection requirements for total hydrocarbons and non methane total hydrocarbons in the air, with a minimum detection concentration of 0.05mg/m3; And only one injection is needed to analyze both total hydrocarbons and non methane total hydrocarbons simultaneously.

●Equipped with a five stage program heating function, intelligent rear door variable frequency automatic cooling,The cooling rate is very fast, achieving true near room temperature operation.

●Equipped with over temperature protection function, the power automatically shuts off and an alarm is triggered when the temperature exceeds the set upper limit. If the temperature of any circuit exceeds the set temperature, heating will automatically stop; And there are Chinese prompts for the cause of the fault and alarm prompts.

4.GC-7900Main technical indicators:
1. Temperature control:
Temperature control range: room temperature +8℃-420℃
Temperature control accuracy: within 200℃Within is±0.1℃In200℃The above is±0.2℃
Heating rate:1-30℃/minute
2. Detector indicators:
FID:detection limit:M_f ≦1×10^-11g/s(benzene)
Noise sound:≦0.02mv
float move:≦0.1mv/h

5. Analysis method:

According to the Comprehensive Emission Standards for Air Pollutants (GB16927-1996), the standard gas injection quantitative and qualitative analysis method is adopted.

The specific analysis method steps can be found in the training materials provided by our company's installation and training personnel.

6.Instrument procurement configuration:

Remarks: