An improved blood suspension media for hematological compositions, having particular utility with a red blood cell component for devices using electronic and optical means for blood determinations, and processes for using the suspension media. The anode-side and cathode-side sealing members seal the cell in cooperation with a polymer electrolyte membrane at sealing parts where the anode-side and cathode-side sealing members are opposed to each other, thereby preventing gas from leaking out of gas flow channels. The plastic body has locking tabs integrally formed therewith for engaging the automotive connector. The first proof mass is suspended to the anchor bases. A leaf spring energizing the free valve to the taper-like valve seat surface is provided in an upper side of the free valve, the leaf spring having an annular portion and a plurality of hook portions extending in a radial direction to an inner periphery of the annular portion, and being formed in a flat shape in a free state. Projections of the horizontal edges from image to image are used to generate tracks.