Since the previous generation products, "makeup air controllers' overall design flaws in the production process, the manufacturer caused unnecessary losses and inconvenience. Such as: the use of mechanical switch detects the size of the film, there is no throttle, the controller and solenoid valves must separate the customer's own assembly. In response to these issues and manufacturer feedback, especially developed second-generation products, "the film width control precision instrument." This product uses infrared sensors to detect, only the sensor mounted on the outside of the film, the film will be able to automatically detect the size. Because it is non-contact detection of thin films using size perennial work so difficult to damage, and high accuracy. And the built-in solenoid valve and the throttle valve (flow control valve), the mounting operation is very simple. Is ideal for blown film industry, is the best choice for replacement.