AQ7800 Ambient Air Non-Methane Total Hydrocarbons Continuous Monitoring System (Direct Measurement Method)
The AQ7800 is a methane and non-methane hydrocarbon analyzer independently developed by WAYEAL for direct measurement of non-methane total hydrocarbons (NMHC) in ambient air. Based on the GC-FID method, the instrument performs backflushing and enrichment processing on the sampled gas to directly measure methane and NMHC concentrations, enabling accurate measurement of higher-concentration NMHC. It complies with HJC-ZY84-2020 'Technical Requirements and Detection Methods for Ambient Air Non-Methane Total Hydrocarbons Continuous Monitoring System'. During operation, ambient air enters the sampling system at a constant flow rate; after dust removal, it is enriched and dehydrated at low temperature through a large-capacity composite trap column. With MFC superimposed sampling volume, valve switching and backflushing, methane and total hydrocarbons are separated into individual peaks for direct concentration determination. The fully heat-traced detection module effectively prevents loss of high-boiling-point and high-concentration samples, achieving a detection limit of ≤1ppbC, superior to the 20ppbC required by the latest standard.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Detection Method | GC-FID |
| Measurement Method | 直测法（Direct Measurement） |
| Measured Components | 甲烷、非甲烷总烃（CH4、NMHC） |
| Detection Limit | ≤1ppbC |
| Latest Standard Detection Limit Requirement | 20ppbC |
| Enrichment Method | 大容量复合型捕集柱低温富集除水 |
| Sampling Flow Control | MFC质量流量控制，叠加采样体积 |
| Separation Method | 阀切换、反吹，甲烷 and 总烃单独出峰 |
| Heat Tracing Method | 检测模块全程高温伴热 |
| Pipeline Treatment | 特殊处理，极低吸附 |
| Compliance Standard | HJC-ZY84-2020 |
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