Control system of negative pressure environment for animal biosafety laboratories

Through the analysis of the temperature, humidity, cleanliness, pressure and other parameters of a negative pressure control room, based on the negative feedback control principle, obtains the control of the pressure difference and directional flow by combined PID adjustment methods, including adjusting the converter frequency of  the general supply and exhaust pipes, controlling the two-state air supply valve by the high-low operating conditions of the room, and controlling the variable exhaust air volume valve according to the room pressure difference. Sets up a system monitoring platform to realize the negative pressure control requirements of each room, meet the negative pressure gradient, directional flow and other parameter requirements, and effectively avoid cross-infection.