Systems, methods and tools for tracking the amounts of merchandise being displayed or available for sale in a retail environment using measurements of air displacement caused by the movement of customers, employees and shopping carts throughout a retail environment. The disclosed embodiments may position air displacement sensors throughout a store and near the products being offered for sale. As the merchandise is removed by customers, a greater amount of air may be measured. Embodiments of each sensor device may be calibrated with a maximum threshold measurement of air displacement corresponding to the amount of merchandise surrounding the sensor. After enough of the products have been removed from the surrounding proximity of the sensor, the maximum threshold of air displacement may be reached, wherein upon exceeding the maximum threshold of air displacement a signal may be sent alerting employees to restock the specified merchandise proximate to the sensor's location.

Systems, methods and tools for tracking the amounts of merchandise being displayed or available for sale in a retail environment using measurements of air displacement caused by the movement of customers, employees and shopping carts throughout a retail environment. The disclosed embodiments may position air displacement sensors throughout a store and near the products being offered for sale. As the merchandise is removed by customers, a greater amount of air may be measured. Embodiments of each sensor device may be calibrated with a maximum threshold measurement of air displacement corresponding to the amount of merchandise surrounding the sensor. After enough of the products have been removed from the surrounding proximity of the sensor, the maximum threshold of air displacement may be reached, wherein upon exceeding the maximum threshold of air displacement a signal may be sent alerting employees to restock the specified merchandise proximate to the sensor's location.

The invention provides an apparatus and method for measuring fluid flow rates. The apparatus comprises a meter body comprising a throughbore with a fluid flow path and a flow displacement member. The apparatus also provides a sleeve slidably mounted within the fluid flow path. The sleeve is configured to be movable between at least two axial positions within the fluid flow path to select a predetermined flow rate measurement range for the flow measurement apparatus.

A method may include disposing an array of at least two sensors responsive to pressure perturbations within the process fluid along at least a portion of the length of a conduit and determining a first speed of sound of the process fluid associated with a first frequency range utilizing an output of the array of sensors. The method may include determining a second speed of sound of the process fluid associated with a second frequency range, where the second frequency range is at or above of a first acoustic cross mode frequency where the second frequency range is higher than the first frequency range and is lower than a bubble resonant frequency. Also, the method may include determining the parameter of the process fluid utilizing the first speed of sound of the process fluid and the second speed of sound of the process fluid in an optimization model.

A method may include disposing an array of at least two sensors responsive to pressure perturbations within the process fluid along at least a portion of the length of a conduit and determining a first speed of sound of the process fluid associated with a first frequency range utilizing an output of the array of sensors. The method may include determining a second speed of sound of the process fluid associated with a second frequency range, where the second frequency range is at or above of a first acoustic cross mode frequency where the second frequency range is higher than the first frequency range and is lower than a bubble resonant frequency. Also, the method may include determining the parameter of the process fluid utilizing the first speed of sound of the process fluid and the second speed of sound of the process fluid in an optimization model.

A flow meter testing system includes a mobile testing platform. The flow meter testing system further includes a rotatable inlet nozzle extending from the mobile testing platform and a rotatable outlet nozzle extending from the mobile testing platform. The flow meter testing system also includes a master flow meter positioned about the mobile testing platform and having a master meter inlet and a master meter outlet, the master meter inlet coupled to the rotatable inlet nozzle and the master meter outlet coupled to the rotatable outlet nozzle. The flow meter testing system further includes wherein the rotatable inlet nozzle is configured to couple to an inlet side of a test flow meter and the rotatable outlet nozzle is configured to couple also to an outlet side of the test flow meter.

A measuring device for metering a fluid. The measuring device includes a container with the fluid, a fluid inlet which is fluidically connected to the container, a fluid outlet which is fluidically connectable with a metering point, a metering line which connects the fluid inlet with the fluid outlet, a delivery pump arranged in the metering line, a density sensor arranged in the metering line, a flow meter arranged in the metering line, and a recirculation line which is arranged to branch off from the metering line downstream of the flow meter and to open into the container. The flow meter is arranged in a measuring unit housing which is arranged at a distance from a pump unit housing in which at least the delivery pump is arranged. The pump unit housing is detachably connected to the measuring unit housing via a connection portion of the metering line.