Abstract: A flow measuring system of the Coriolis type for measuring a mass flow, with a flow tube and with excitation elements for causing the flow tube to rotate about an axis of rotation, with at least three sensors arranged free of the flow tube for generating analog signals that correspond to the movement of the tube, and with elements for digitizing the analog signals and for computing the mass flow from the digitized sensor signals. The computation elements are arranged for using exclusively the time information from the sensor signals. The accurate time information of the sensors is used by algorithms in digital electronic circuits for accurately determining the ratio between amplitudes due to excitation and those due to Coriolis forces. The mass flow is derived from this ratio.

Abstract: Coriolis mass flowmeter comprising a flow tube, at least one tube position sensor provided with a light source and with a light detector for receiving light from the light source, and drive means for causing the tube to move about an axis, the above being arranged such that the tube or a projection fastened to the tube, for example a vane, moves through a light path between the light source and the light detector, wherein a first screen with a first light-transmitting opening is placed at the side of the light source and a second screen with a second light-transmitting opening is placed at the side of the light detector, wherein the first and the second opening are identical and are correspondingly oriented, and wherein the openings are mutually parallel and aligned so as to form a prismatic light beam on the detector.

Abstract: A flow measuring system of the Coriolis type for measuring a mass flow, with a flow tube and with excitation means for causing the flow tube to rotate about an axis of rotation, with at least three sensors arranged free of the flow tube for generating analog signals that correspond to the movement of the tube, and with means for digitizing the analog signals and for computing the mass flow from the digitized sensor signals. The computation means are arranged for using exclusively the time information from the sensor signals. The accurate time information of the sensors is used by algorithms in digital electronic circuits for accurately determining the ratio between amplitudes due to excitation and those due to Coriolis forces. The mass flow is derived from this ratio.

Abstract: Coriolis mass flowmeter including a flow tube, at least one tube position sensor provided with a light source and with a light detector for receiving light from the light source, and drive elements for causing the tube to move about an axis, the above being arranged such that the tube or a projection fastened to the tube, for example a vane, moves through a light path between the light source and the light detector, wherein a first screen with a first light-transmitting opening is placed at the side of the light source and a second screen with a second light-transmitting opening is placed at the side of the light detector, wherein the first and the second opening are identical and are correspondingly oriented, and wherein the openings are mutually parallel and aligned so as to form a prismatic light beam on the detector.

Abstract: Mass flowmeter comprising a hollow conduit of a heat-conducting material for transporting in a determined flow direction a fluid with a mass flow rate to be measured, a first temperature-sensitive resistor element at a first position in thermal contact with this conduit for supplying heat to said fluid, a temperature sensor and measuring and control means connectable to the resistor element and the temperature sensor, wherein the temperature sensor is provided in thermal contact with the conduit at a second position upstream in relation to said first position, and the measuring and control means are adapted to maintain a constant difference in temperature at said first and second positions.

Abstract: Mass flowmeter comprising a hollow conduit of a heat-conducting material for transporting in a determined flow direction a fluid with a mass flow rate to be measured, a first temperature-sensitive resistor element at a first position in thermal contact with this conduit for supplying heat to said fluid, a temperature sensor and measuring and control means connectable to the resistor element and the temperature sensor, wherein the temperature sensor is provided in thermal contact with the conduit at a second position upstream in relation to said first position, and the measuring and control means are adapted to maintain a constant difference in temperature at said first and second positions.