An ultrasonic meter for recording a through-flow rate of a fluid has a fluid inlet, a fluid outlet, and a flow channel connecting the inlet to the outlet. The flow channel has a measurement region which extends in a straight line in a flow direction. Between the measurement region and the fluid outlet, there is arranged a reflection element which is flowed around by the fluid and by which an ultrasonic signal is reflected into the measurement region. Between the measurement region and the reflection element, there is arranged a changeover region of the flow channel. In the changeover region a spacing between a central straight line of the measurement region and the side wall enlarges. The changeover region has, in the circumferential direction of the flow channel, several circumferential sections in which the enlargement of the spacing between the central straight line and the side wall takes place.

A method for operating a flowmeter is disclosed. The flowmeter has a sensor for capturing a measured variable indicating the flow, and for converting the measured variable into a signal. The flowmeter also has a control and evaluation unit that determines a flow measurement value for the flow from the signal and outputs an output value representing the flow measurement value. The method includes: determining flow measurement values; forming smoothed flow measurement values over a plurality of flow measurement values, respectively; and activating a low flow cut-off. When the low flow cut-off is activated, the output value is set to zero if: the current smoothed flow measurement value is below a first predetermined limit value; and a predetermined number of flow measurement values has been determined with deactivated low flow cut-off or a predetermined number of smoothed flow measurement values has been formed with deactivated low flow cut-off.

A method for operating a flowmeter is provided. The method includes the steps of measuring a fluid flow in the flowmeter, determining at least one fluid characteristic, determining a preferred algorithm of a plurality of algorithms based upon the fluid flow and the at least one fluid characteristic, and applying the preferred algorithm to an operating routine.

An air intake set for a motor vehicle engine, including an air intake hose, a flow meter and a device for directing an air flow positioned upstream of the flow meter with respect to the direction of circulation of the air flow in the hose. The device for directing an air flow is adapted to guide the air flow towards the flow meter and has a variable permeability so as to set the velocity of the air flow.

A self-correcting pressure-based mass flow control apparatus includes outlet pressure sensing to enable correction for non-ideal operating conditions. Further the mass flow control apparatus having a fluid pathway, a shutoff valve in the fluid pathway, a reference volume in the fluid pathway, a first pressure measuring sensor in fluid communication with the reference volume, a first temperature measuring sensor providing a temperature signal indicative of the fluid temperature within the reference volume, a proportional valve in the fluid pathway, and a second pressure measuring sensor in fluid communication with the fluid pathway.

An apparatus and method for measuring wet gas using a Coriolis flow meter is provided. An apparatus embodiment includes a Coriolis meter, a DP meter, and a processing unit. The processing unit is in communication with the Coriolis and DP meters, and a memory storing instructions. The executed instructions cause the processing unit to: a) measure a density of the fluid flow using the Coriolis meter; b) determine a measure of gas wetness of the fluid flow using the measured density, an expected gas density value, and an equation of state model; c) determine a differential pressure measurement across the Coriolis meter; d) determine an over-reading of the differential pressure measurement; e) determine a mass flow rate of gas using the determined over-reading; and f) determine a mass flow rate of liquid.

A method for operating a flowmeter is provided. The method includes the steps of measuring a fluid flow in the flowmeter, determining at least one fluid characteristic, determining a preferred algorithm of a plurality of algorithms based upon the fluid flow and the at least one fluid characteristic, and applying the preferred algorithm to an operating routine.

A fluid meter has a first communication interface and is connected to the cut-off unit having a communication interface. If the fluid flow rate remains greater than a first predetermined flowrate threshold for at least a first predetermined duration, to detect that there is a leak of fluid and to transmit an internal command frame incorporating a closing command to the communication interface of the cut-off unit. Following closing of the electromechanical valve, to acquire a first external command frame incorporating an opening command produced by the cut-off unit following manual action on an actuator member of the cut-off unit, to produce an internal command frame incorporating the opening command, and to transmit said internal command frame via the first communication interface to the communication interface of the cut-off unit in order to reopen the electromechanical valve.

A reference volume for use with pressure change flow rate measurement apparatus has an internal structure comprising elements with cross section and length comparable to the cross section and length of adjacent interstitial fluid regions. The reference volume may have one or more heat conduction elements exterior to and in good thermal contact with a corrosion resistant material that defines the internal fluid holding region.

A method of monitoring a set of meters that are connected to a common remote processor device, the method comprising both first steps performed in each meter for: acquiring primary measurements of a magnitude representative of the occurrence of an anomaly; selecting pertinent measurements from the primary measurements, the pertinent measurements satisfying a pertinence criterion; regularly transmitting the pertinent measurements to the remote processor device; and second steps performed in the remote processor device, for: comparing, for each meter, the pertinent measurements with a detection threshold common to all of the meters of the set of meters in order to attempt detecting an anomaly associated with said meter; and adjusting the detection threshold dynamically as a function of the percentage of meters detected as being associated with an anomaly.