三级生物安全实验室空气指标的自动化控制

Automatic Control of Air Quality in BSL-3 Laboratory

目的实现三级生物安全(BSL-3)实验室各区域的压强梯度、温度与湿度等各项指标的动态平衡,保证工程屏障的生物安全防护作用。方法设计了BSL-3实验室空气指标自动化控制系统。该系统在变送器及专用数据采集设备的基础上采用直接数字控制模式(DDC)控制,并设置图形监控系统。上位机可同时对各项指标进行实时记录存盘并分析处理,根据实时情况对相应输出设备进行调节,对超过设定限值的数据发出报警。结果该系统能实时采集BSL-3实验室各区域、空调机组、空气过滤器等所有监控点的压力、温度、湿度、阻力、设备运行状况等模拟量信号和风机、电动执行器等的启停(运行)状态以及报警信息,以彩色动态仿真图形显示,并实时对设施的运行进行控制。监控中心可通过DDC控制器远程修改现场的控制参数,系统自动调节相关设备的输出量。监控中心自动执行警报,强制画面显示报警的环节和原因,工作人员可根据用户等级来处理报警信息。结论该自控系统可实时有效地对室内环境指标状态以及设施的运行状况等进行监控,满足了实验室的生物安全要求。

Objective To keep the homeostasis of pressure grad, temperature and humidity among every area, and to ensure the protective effect of engineering barrier in biology safety. Methods DDC was used in the control system based on the transducer and special data collection equipment, and the figure monitoring system was established. The computer was used to save and process the data of real time and then the related output devices were regulated according to the situation. The alarm will be sounded if any data is out of the limit. Results The system could collect real-time simulation quantity signal of pressure, temperature, humidity, resistance, device work condition and so on in every area in laboratory, such as air-condition, air filter, fan and electric-performer＇s start-stop（operate） state. The alarm information was showed by CRT coloured dynamic emulational figure. Monitoring center could rework the local control parameters through the DDC controller, the system could adjust the device output automatically. Monitoring center could make alert automatically and the tache and causation were displayed then the operator could deal with the alert message according to the user grade. Condusion The automatic control system introduced in this article can observe the indoor environment state and control the running parameters of the device availably and immediately. It can meet the requirement of laboratory biological safety.