Built-in detection system for sulfur hexafluoride gas humidity

The utility model provides a built-in detection system of sulfur hexafluoride gas humidity. The built-in detection system is characterized by comprising a tank body, a mirror surface type sulfur hexafluoride humidity-density sensor, a motor, a magnetic coupling and a fan arranged in the tank body, a safety valve, a pressure gauge, a vacuum gauge, an air inlet, an air outlet and conversion adapters used for mounting a detected sulfur hexafluoride humidity sensor are arranged on the tank body, wherein the mirror surface type sulfur hexafluoride humidity-density sensor is mounted on the inner wall of the tank body, the air outlet is connected with a dew-point meter through a valve, the magnetic coupling is embedded on the tank body, an outer rotor of the magnetic coupling is connected with the output shaft of the motor, and an inner rotor of the magnetic coupling is fixedly connected with the fan. According to the utility model, the mirror surface type built-in sulfur hexafluoride sensor adopts the cold mirror principle, namely when the temperature of a mirror surface is low enough, moisture in air is condensed into dews on the mirror surface, and then the temperature of the moisture in air which is condensed into the dews on the mirror surface is directly detected, the temperature at the moment is the dew point, furthermore, the detection is not affected by pressure in a container, so that more accurate detection and good reproducibility are achieved.