One aspect of the present disclosure includes a transfer standard apparatus for in situ calibration of measuring devices including a manifold having a first header in fluid communication with a second header via two or more flow lines, the first header and the second header each having ports at each end structured to accept external flow lines, two or more flow meters, each disposed in one of the flow lines such that the flow meters are connected in parallel relative to the first header and second header, and valves disposed in the flow lines adjacent the first header and the second header and operable to selectively isolate each flow meter from the first header and the second header. The transfer standard apparatus may include a mobile platform on which the manifold is mounted, including access to the ports of the first header and second header.

A fluid flow meter is described, that includes intermeshing gears that may rotate synchronously. The fluid flow meter may produce a pulsed output that can be normalized to suitable values according to a method of normalizing input pulses generated in response to the rotation of gears. A volume counter can be incremented by an amount equal to a volume per input pulse each time an input pulse is generated. When the volume counter exceeds a first reference volume, a normalized output pulse can be generated until the volume counter exceeds a second reference volume.

A test apparatus to test operation of a gas meter. The test apparatus may include metrology devices, namely, a master meter and a measuring device, typically with a sensor to measure ambient conditions that prevail at the master meter and the gas meter. Each of the metrology devices can be configured as a self-contained, independent unit that can process analog signals to generate a digital signal. A controller may process these digital signals to convey information that defines flow volume for gas that flows through the gas meter. The controller may also be configured to verify a regulatory status for the metrology devices. These configurations can use validation data stored on the metrology devices separate and independent of the controller. In this way, the test apparatus assumes a modular structure that allows the metrology devices to swap into and out of the test apparatus.

A method for calibrating flow meters for fluid media comprises the steps of guiding a medium (102) through a reference measuring section (101-1) and a test measuring section (101-2) which has a flow meter to be calibrated, establishing at least approximately identical and constant pressure and flow conditions for the medium (102) in both measuring sections (101-1, 101-2), detecting a reference throughflow of the medium (102) through the reference measuring section (101-1) and throughflow values which correspond temporally thereto and are measured by the flow meter (125) to be calibrated of the test measuring section at a preset medium temperature, comparing the detected reference throughflow through the reference measuring section (101-1) with the throughflow values which correspond temporally thereto of the flow meter (125) to be calibrated, in order, based on this, to determine at least one correction value for the calibration of the flow meter (125) at the preset medium temperature, and determining of the respective correction value for the flow meter (125) for different medium temperatures of the medium (102), in order to determine a calibrating function using the temperature-dependent correction values as grid points.

A fluid flow analysis method and corresponding apparatus comprise performing two different sets of diagnostic checks which are associated with different types of flow meters, and cross-referencing the two sets of checks.

An airflow testing system for an aerospace component uses a flow master with a first sealing surface, a hollow body, and a metering plate. A desired back pressure across a flow path through the aerospace component is determined, and used to form a metering outlet through the metering plate. The plate is attached to the hollow body in a fluid seal, the flow master is secured to a testing position in a fluid seal, and back pressure across the flow master is sensed while flowing air through the flow master. The difference between desired and sensed back pressure is used to evaluate the airflow testing system.

The measurement device comprises a transmitter for providing a transmitted signal at a frequency. The transmitter provides the transmitted signal to the transmitting antenna. A receiving antenna is arranged to receive the transmitted signal. A receiver is capable of receiving the transmitted signal from the receiving antenna. An electronic data processor is adapted to measure an observed parameter of the transmitted signal between the transmitting antenna and the receiving antenna to estimate the precise yield, where the observed parameter comprises observed attenuation, phase or both of the transmitted signal, as received at the receiver.

A flowmeter test system that tests a test target flowmeter by flowing fluid through the test target flowmeter and measuring the fluid having flowed through the test target flowmeter by a measurement part different from the test target flowmeter is disclosed. The flowmeter test system includes, a storage part adapted to store the fluid, a distribution flow path adapted to distribute the fluid between the storage part and the test target flowmeter, a measurement part introduction path adapted to be connected to the distribution flow path and introduce the fluid into the measurement part, and a flow path switching part adapted to switch between the distribution flow path and the measurement part introduction path. A pressure loss in a flow path from the flow path switching part to the storage part and a pressure loss in a flow path from the flow path switching part to the measurement part are same.

Embodiments of a portable verification system can move from one in-field gas flow meter location to another and temporarily connect downstream of a main pipeline's meter run or station. A control valve of the portable verification system allows volume measurement at different flow velocities to be verified. In some embodiments, the portable verification system is connected to the meter run and the main pipeline by a corresponding slip or linearly adjustable pipeline section. This section can extend horizontally and vertically, as well as swivel to provide versatility when connecting in the field. Adaptor fittings having one flange sized for and fitted to the inlet and outlet ends of the portable verification system and another flange sized for the meter run or main pipeline connection provide additional versatility. Downtime is limited to the time required to complete a circuit between the meter run, portable verification system, and main pipeline.

A method for operating a flowmeter for measuring the flow of a flowing medium through a pipe, wherein the flowmeter has a measuring unit for determining individual measured values of the flow and an error unit for determining the measurement uncertainty of the individual measured values. Determination of the individual measured values is carried out using a measuring frequency. A method for operating a flowmeter, which improves the quality of measurement is achieved in that a present measurement uncertainty is determined for each individual measured value by the error unit and by the measurement uncertainties from static and dynamic error sources being linked to one another by error propagation for determining the present measurement uncertainty.