An interlock monitoring system includes a magnetic proximity sensor within a poppet valve type coupler to detect whether the poppet valve is opened or closed. 3 \u03bcm or more, and whose pore diameter at a specific cumulative surface area of 5% is 30 \u03bcm or less, thermal conductivity of 210 Wm\xb7K or more is obtained by decreasing the content of iron-family metal to be less than 0. 1 torr and 2 torr at room temperature. The brewing head and at least one of the two closure elements with at least a brewing chamber are arranged in the brewing module in a linearly displaceable fashion.