Development of high-precision temperature and humidity testing cabinet and its measure and control system

In order to overcome the shortcomings of traditional temperature and humidity testing cabinet, such as high price, low technical indicators, single measurement and control parameter, and so on, the temperature and humidity testing equipment with high reliability, moderate cost, high degree of automation was developed. The constant humidity system of the cabinet used inside and outside double-loop structure, and the constant temperature system used two-time constant temperature technique and sectional measurement scheme. Using the methods such as expert PID control strategy, hardware double protection and software compensation, it realized accurate measurement and control of temperature and humidity, and high performance/cost ratio. The system can be widely applied to the fields of scientific research of meteorological, verification of temperature and humidity, breeding industry and other applications due to its flexibility and modularity.