Abstract: A diaphragm construction for a process measuring device comprises a sensing element arranged in a functional connection with a process medium to be measured, a part exterior of the process medium, comprising a measuring means, a lever-like transfer element to transmit a force effect exerted on the sensing element to the measuring means, and a diaphragm to isolate the process medium from the exterior part. The transfer element comprises a first rod part arranged to be placed in a process medium flow channel and a second rod part arranged to be placed in a part of the process measuring device exterior of the process. A fixing element is arranged to be placed in connection with the second rod part of the transfer element, the fixing element comprising a supporting portion and a fixing portion, wherein the diaphragm is arranged to be clamped between the fixing portion and the second rod part.

Abstract: The measuring device (2) comprises a sensing element (4) communicating with the process substance as well as a lever-like transfer element (7) connected with the sensing element and arranged to transfer the force acting on the sensing element and generated by the process substance to be measured to a measuring element (6) using the torque applied to the transfer element (7) about its fulcrum. The through hole (8) has a diaphragm (14) of elastic material covering the hole, being in engagement with the transfer member (7) in the position substantially perpendicular to the longitudinal axis thereof and acting as a sealing member separating the portion outside the process substance from the process substance.

Abstract: A spring unit for use in force measuring apparatus, the unit being adapted to present an adjustable spring constant so as to be useful for measuring directional forces of widely different magnitudes imparted thereon. The spring unit includes a ring-shaped member adapted to be rotatably connected to the fixed frame of measuring apparatus about an axis of rotation in a manner such that the rotational position of the ring-shaped member can be selectively adjusted to a particular position, a hub member disposed within the ring-shaped member, and spring apparatus interconnecting the ring-shaped member and the hub member. The effective spring constant of the measuring unit is selectively adjustable through the rotation thereof about its axis of rotation so that the unit can effectively function within selected varying ranges of forces to be measured.