Abstract: Described and shown is a method for operating a flowmeter (1) having a measuring tube (2), wherein the flow (d) of a medium (4) through the measuring tube (2) is measured. A continuous dwell time of the measured flow (d) greater than or equal to a flow threshold (ds) is assigned to a flow interval (?tD,1, ?tD,2) and a flow volume (V1, V2) is determined from the measured flow (d) in the flow interval (?tD,1, ?tD,2). In each case, a continuous dwell time of the measured flow (d) less than the flow threshold (ds) is assigned to a zero flow interval (?tN,1). In each case, a deviation volume of the flow volume (V1, V2) in one of the flow intervals (?tD,1, ?tD,2) from a reference flow volume is determined and the deviation volume is compared to a threshold deviation volume.

Abstract: A magnetic field generator (1) of a magnetic-inductive flowmeter for generating an alternating magnetic field running at least also perpendicular to the longitudinal axis of a measuring tube, wherein at least one field coil (2), a current regulator (3), a switching bridge (4) and a microcontroller (5) all form part of the magnetic field generator (1). Two different coil voltages are provided for the coil power supply, namely an initial voltage and a lower operating voltage, and a voltage selector (6) is provided for switching from the initial voltage to the operating voltage—and vice versa.

Abstract: A communication arrangement (12), a gate device (5) and method for data communication between a mobile operating unit (1) and a field device (2) provides a certain ease in handling. The method involves a user program (3) being loaded onto or activated on the mobile operating unit (1). Furthermore, data from the mobile operating unit (1) is transmitted to a data communication device (4) and from the data communication device (4) to a gate device (5) and from the gate device (5) to a transmitting device (9) of the field device (2) and/or is transmitted in the opposite direction.

Abstract: A data-recording device for a measurement device (2) that contains measurement device electronics (3) having an internal data bus and a data interface (4), wherein the data-recording device includes at least one storage element (5), at least one processing unit (6) linked with the storage element (5) and a data interface (7) and wherein the device can be linked with the measuring device via its data interface and via the corresponding data interface of the measurement device and data can be exchanged between the measurement device and the data-recording device. The data-recording device is able to read-only access the internal data bus of the measurement device (2) without functional interference via its data interface (7)—bus observation, thus avoiding certain disadvantages of similar prior data-recording devices.

Abstract: A data-recording device for a measurement device (2) that contains measurement device electronics (3) having an internal data bus and a data interface (4), wherein the data-recording device includes at least one storage element (5), at least one processing unit (6) linked with the storage element (5) and a data interface (7) and wherein the device can be linked with the measuring device via its data interface and via the corresponding data interface of the measurement device and data can be exchanged between the measurement device and the data-recording device. The data-recording device is able to read-only access the internal data bus of the measurement device (2) without functional interference via its data interface (7)—bus observation, thus avoiding certain disadvantages of similar prior data-recording devices.