Abstract: This paper proposes a separable probe for combustible gas detection in order to decrease the risk of high-altitude operation.In this design, the probe is divided into two parts, i.e. one fixed part and one removable part. The fixed part includes an explosion-proof junction box and an electromagnet terminal in the box. The removable part is the main part of the probe, which can be removed for calibration and adjustment. The two parts are attached to one another by the electromagnet. When the probe needs verification or maintenance, the electromagnet is turned off by remote control, so that the removable part can be taken off. The explosion-proof type, structure size, structure strength of the explosion-proof junction box, and electromagnet selection are analyzed in detail.