Abstract: An ultrasonic transit-time flowmeter and a method for detecting a failure in an ultrasonic transit-time flowmeter are provided. The flowmeter includes a first ultrasonic transducer and a second ultrasonic transducer, wherein the transducers each are configured to transmit and receive signals, wherein the signals are transmitted between the transducers and measurements of transit-times of the signals and a transit-time difference based upon the transit-times are used to calculate a fluid flow velocity. Further, the flowmeter has a first reference element and a second reference element, wherein the first and second reference elements each provide a reference signal, and an electronic controller, wherein a predetermined value is stored in a memory of the controller. A reference value based upon the reference signals is compared with the predetermined value and a failure of the ultrasonic flowmeter is identified based upon a comparison of the reference value with the predetermined value.

Abstract: An ultrasonic transit-time flowmeter and a method for detecting a failure in an ultrasonic transit-time flowmeter are provided. The flowmeter includes a first ultrasonic transducer and a second ultrasonic transducer, wherein the transducers each are configured to transmit and receive signals, wherein the signals are transmitted between the transducers and measurements of transit-times of the signals and a transit-time difference based upon the transit-times are used to calculate a fluid flow velocity. Further, the flowmeter has a first reference element and a second reference element, wherein the first and second reference elements each provide a reference signal, and an electronic controller, wherein a predetermined value is stored in a memory of the controller. A reference value based upon the reference signals is compared with the predetermined value and a failure of the ultrasonic flowmeter is identified based upon a comparison of the reference value with the predetermined value.

Abstract: The invention is directed to a gait rehabilitation aid and to a method for aiding gait rehabilitation. The gait rehabilitation aid resides in a treadmill having a belt which speed matches a user's own step cycle based on let length and which provides feedback in the form of an evaluation with respect to the user's length, cadence, gait velocity and gait pattern. A controller that is responsive to a user input device is employed to input information that inputs information pertaining to any one of cadence and leg length sets the belt speed to match an appropriate step cycle. In addition, footprints are scrolled on a display together with foot falls that correspond to actual heel strike events on the treadmill belt. The footprints appear in accordance with the user's own step cycle.