Dry gas meter

In a dry gas meter, in which the movement of the diaphragms is transmitted via a linkage with a crank drive to a crankshaft which drives a counter, the connecting rod (38) of the crank drive is of elastically flexible design in the longitudinal direction. The connecting rod comprises a single injection-moulded plastic part. The elastic flexibility is achieved by the fact that the connecting rod is formed by sections (52 and 54) having lateral, mutually parallel arms (62 and 64). The arms are connected to one another by torsion elements (66). In a preferred embodiment, the crank arm (44) of the crank drive is likewise flexible, in the radial direction, with a spring constant considerably lower than that of the connecting rod (38), the radially inward spring travel of the crank arm (44) being limited. A description is given of a design of the crank arm (44) in which the crank arm (44) is produced from a single injection-moulded plastic part, is designed to be radially flexible as far as a stop but transmits forces in the circumferential direction in a virtually rigid manner.