Pre concentration gas chromatography-mass spectrometry online monitoring system for volatile organic compounds

Continuous monitoring system for volatile organic compounds in ambient air, using online pre concentration system and gas chromatography solution, with multiple water removal methods to choose from. Combined with customized cloud system software from Antech for data processing and uploading, it realizes the monitoring of volatile organic compounds in ambient air Continuous monitoring of ozone precursors. This system has high sensitivity, low operating cost, and is suitable for complex sampling environments. It has excellent detection limits for volatile organic compounds.

Pre concentration gas chromatography-mass spectrometry online monitoring system for volatile organic compoundsApplicable to《The 2018 Key Areas Environmental Air Volatile Organic Compounds Monitoring Plan includes compounds such as PAMS, TO14, TO15, aldehydes and ketones, HJ759, HJ734, etc. The sample gas is sampled by a sampling pump, treated with water and dust removal, and then enters the online pre concentration system through the sampling main pipe. After high-temperature rapid analysis, it enters GC-FID/GC-MS analysis. The software monitoring and management platform implements automated statistical analysis of the analysis results and uploads the data to the environmental monitoring station.

Pre concentration gas chromatography-mass spectrometry online monitoring system for volatile organic compoundsSystem features:

（1） Standardized design: Cabinet style integration, saving space; The system wiring is simple and easy to install and maintain; Compliant with《Requirements such as the Monitoring Plan for Volatile Organic Compounds in Environmental Air of Key Areas in 2018; Fully automatic sampling design, capable of online monitoring function

（2） Stable and secure operation, authentic and reliable data: online internal standard addition, restoring real data; Full pipeline insulation and heat tracing to avoid condensation of the tested substance pipeline; The sampling pipeline should be made of polytetrafluoroethylene, borosilicate glass, or inert materials Road, reduce losses caused by pipeline adsorption; Negative pressure injection ensures data authenticity; supportThe HJ212 protocol ensures data comparison and verification by synchronizing the upper computer time with the chromatograph time, and supports data and data status uploading.

（3） Strong detection capability: high system sensitivity, capable of monitoringPPT level pollutants; GC-MS/FID detection can detect over 108 types of pollutants in a single sample; Mature water vapor management, suitable for online monitoring in complex environments

（4）　 High safety design: The chromatograph automatically monitors the pressure or flow rate of the carrier gas. Once the supply of carrier gas is insufficient, the internal hot zone of the chromatograph will automatically shut down; Instruments are protected against lightning strikes, surges, static electricity, etcEMC testing and CMC testing for safety, drop, vibration, etc., with a total of more than 20 testing items; The instrument exhaust fan has an alarm function, and when the fan is abnormal, the instrument will immediately stop running and close all hot zones to prevent excessive temperature from causing electronic components to malfunction and affecting data efficiency; The chromatograph detector automatically cuts off the gas and auxiliary gas after shutting down; Automatic monitoring of hydrogen generator leakage, and automatic stopping of hydrogen supply and alarm upon detection of leakage.

（5） Automatic recovery and operation: The system has a self starting function upon incoming calls and automatically analyzes samples, saving operation and maintenance costs while ensuring data efficiency; When the chromatograph is powered on or the gas supply is restored, the system automatically ignites and detects the ignition status through the above The machine will resume automatic operation.

（6） Fully automatic operation: SMS alarm function, immediately notify relevant personnel by SMS after equipment failure or exceeding standards, and accurately determine the fault information; The upper computer controls the entire system, supportingHJ212 protocol, which controls the operation of analytical instruments through the upper computer; By remotely controlling the upper computer, the VOCs online monitoring system can achieve automatic multi-point calibration, manual calibration, automatic verification, and save calibration and verification records for automatic analysis, which facilitates platform control of the system and reduces operation and maintenance costs; Support the upload of important system parameters such as sampling tube temperature, detector gas flow rate, and chromatographic column head pressure data.

（7） Strong scalability: The system supports multiple expansion interfaces, including temperature alarm, combustible gas alarm, sound and light alarm, toxic and harmful gas alarm, oxygen alarm, etc; A system that connects multiple sampling pointsOne to many system.

（8） Main applications: automatic monitoring of ambient air; Air pollution in residential areas Automatic monitoring; Automatic monitoring of atmospheric pollution at enterprise boundaries; Occupational environment air pollution Dyeing automatic monitoring; Automatic monitoring of air pollution in key industrial parks; workplace Automatic monitoring of air pollution.

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