Abstract:It is a challenge to performing tail gas recovery without affecting the accuracy of the instrument detection while the detection of SF6 electrical equipment produces a larger amount of exhaust in field preventive tests and checking test. In this paper, differential pressure sensor is used to measure the pressure difference between air and buffer air chamber. The control of the buffer chamber by the micro control unit remains within the pressure limit range. Exhaust gas recovery device control part of the DSP core control chip as the core, the next crew control board through the DSP program device control, human-computer interface design are beautiful and practical, pressure sensor calibration, good linearity. Ensuring that the recovery of exhaust gas does not affect the accuracy of gas detection, and the device has a large capacity, can be detected repeatedly with the exhaust gas. The device can be used in conjunction with a variety of gas detection equipment in the field, for example, SF6 gas decomposition products detector, etc. The development device has been applied in the field to verify the reliable of the device and bring outstanding environmental benefits.