System overview:
The fixed pollution source VOC alarm system is designed in accordance with the technical requirements of the continuous automatic monitoring system for VOC emission from fixed pollution sources (DB 44 / T 1947-2016) based on the optical ionization detector (PID) method and the online monitoring of VOC from industrial pollution sources in Hebei Province.
System workflow:
The sampling pretreatment system consists of sampling probe, water gas separator, filter, sampling pump and gas controller.
The flow of sampling pretreatment system is shown in the figure below. Under the sampling pump, the gas is extracted from the exhaust pipe, transported through the sampling probe and sampling pipe, separated and filtered by water and gas, and then enters the PID gas analyzer. The gas analyzer is internally integrated with a number of high-performance microprocessors to measure the VOCs gas concentration. After the whole measurement is completed, exhaust gas is discharged through the exhaust hole.
技术参数：
检测气体 | 挥发性有机气体（VOCs） | |
检测原理 | PID原理，抽取方式采样，长期连续工作。 | |
测量范围 | 0～200、2000、10000ppm可选 | |
分 辨 率 | 0.025ppm（0～200ppm）；0.05ppm（0～2000ppm）；0.1ppm（10000ppm） | |
重复性 | ≤±3% (以异丁烯计) | |
零点漂移 | ≤ 2 mg/m3(以异丁烯计) | |
响应时间 | ≤20秒（T90） | |
测定下限 | ≤ 5 mg/m3 | |
实际气样比对误差 | ≤ 50% （VOCs≤15 mg/m 3 ） | |
≤ 35% （VOCs＞15 mg/m 3 ） | ||
恢复时间 | ≤10秒 | |
数据采集 | 平板电脑 | 2路RS232/RS485通讯接口，Windows XP操作系统 |
系统软件 | 污染源在线监控管理软件 | |
输出 | RS232/RS485信号输出、以太网输出、报警端口输出 | |
工作电源 | 220V AC/50Hz 0.5KW | |
工作温、湿度 | 5～40℃、≤85%RH | |
