Abstract: An ultrasonic flow measuring device, which determines volume and/or mass flow of a medium in a pipeline, or in a measuring tube. The flow measuring device includes a plurality of ultrasonic sensors, which emit and/or receive ultrasonic measurement signals along defined sound paths. The control/evaluation electronics of the flow measuring device is divided into an on-site electronics, in which at least one switch is provided, via which the ultrasonic sensors, arranged in different sound paths, can be driven and/or queried, and at least one remote, control/evaluation unit, wherein the control/evaluation unit so switches the at least one switch, that the driven and/or queried, ultrasonic sensor, or the driven and/or queried pair of ultrasonic sensors, is activated and provides measured values.

Abstract: The apparatus includes at least one heat exchanger (30) secured on the inline measuring device. Temperature-control fluid flows through the heat exchanger (30), at least at times during operation, for the purpose of transporting heat. The apparatus additionally includes securement means (50, 60) for the, especially releasable, fixing of the heat exchanger (30) externally on the inline measuring device (1). The heat exchanger (30) has an inner wall (32), especially a trough- or dish-shaped inner wall, contacting the inline measuring device (1) externally at least partially flushly, as well as an outer wall (31) fixed to the inner wall (32).