Based on microprocessor technology, Dynamic Dilution Calibrator is developed for precise gas analyzer and supports multi paths calibration. With high-accuracy mass flow controller and standard gas, this system can provide calibration gas for zero point and span inspection of multiple gas components. Up to 4 gas sources can be provided. Instrument design emphases fast response, high repeatability, high accuracy and ease of operation. Working with ozone generator, quality control of lab and gas analyzer can be ensured.