Product Introduction Gas desorption instrument is the determination of the the field desorption amount of coal seam gas content was measured to calculate watts of loss instrument. FHJ-2, 5-type gas desorption speed meter underground scene desorption using this instrument required field manual timing measurement, the artificial plot points curve fitting method, human error is larger. Gas desorption flow sensor measurement instrument, the MCU intelligent processing technology, can effectively reduce the manual operation errors, and improve work efficiency. Performance characteristics? Sensitivity, precision flowmeter function and stopwatch function;? Site calculated the gas loss quickly learned;? Can detect pressure and temperature of the environment;? Continuous automatic sampling three hours data;? Automatically save 15 groups data;? host computer communication, easy data query and statistics;? print sample log sheet measured record table. The working principle of gas desorption rate instrument adopted in accordance with the national standards GBT23250-2009 micro flow sensor for the measurement of the amount of gas desorption, the A / D conversion to a digital value, then the MCU processing, calculated using the straight-line method, the power function by two function with actual sampling data curve similar judgment to choose which the most intended function method to calculate the gas desorption loss.