A method of calibrating a yield sensor of a harvesting machine. The yield sensor generates a grain force signal as clean grain piles are thrown by the elevator flights against the sensor surface of the yield sensor. A grain height sensor is disposed to detect a height of the clean grain pile on each passing elevator flight. Each grain height signal is associated with a corresponding grain force signal by applying a time shift to account for a time delay between the time the grain height signal is generated and the time at which the impact signal is generated. The grain force signal is corrected by multiplying the grain force signal by a correction factor. The correction factor is the sum of the grain height signals divided by the sum of the grain force signals over a predetermined period.

A method of calibrating a yield sensor of a harvesting machine. The yield sensor generates a grain force signal as clean grain piles are thrown by the elevator flights against the sensor surface of the yield sensor. A grain height sensor is disposed to detect a height of the clean grain pile on each passing elevator flight. Each grain height signal is associated with a corresponding grain force signal by applying a time shift to account for a time delay between the time the grain height signal is generated and the time at which the impact signal is generated. The grain force signal is corrected by multiplying the grain force signal by a correction factor. The correction factor is the sum of the grain height signals divided by the sum of the grain force signals over a predetermined period.

A fan, in particular axial fan and preferably backward-curved radial fan, having an impeller equipped with blades, an electric motor for rotating the impeller and a device for determining the airflow when the impeller is rotating. The device for determining the airflow includes a volume flow measuring wheel arranged in the air flow, which is arranged upstream of the impeller on the inflow side. The air volume flow is calculated or derived from the rotational speed of the volume flow measuring wheel.

A fan, in particular axial fan and preferably backward-curved radial fan, having an impeller equipped with blades, an electric motor for rotating the impeller and a device for determining the airflow when the impeller is rotating. The device for determining the airflow includes a volume flow measuring wheel arranged in the air flow, which is arranged upstream of the impeller on the inflow side. The air volume flow is calculated or derived from the rotational speed of the volume flow measuring wheel.

A method for determining a rock property includes positioning a core sample in a core sample assembly that is enclosed in a pressurized container with a flow inlet, a flow outlet, and a pressurized fluid inlet fluidly coupled to a pressurized fluid reservoir that includes a pressurized fluid pump; sequentially performing at least three test operations on the core sample; at each of the at least three test operations, measuring an inlet pressure at the flow inlet, measuring an outlet pressure at the flow outlet, and measuring a confining pressure within the pressurized container; and determining a permeability of the core sample based at least in part on at least one of the measured inlet pressures, at least one of the measured outlet pressures, and at least one of the measured confining pressures.

A mass flow meter includes an arcuate tube section that is semi-circular, an inner pressure sensor disposed on an inner curvature portion of the arcuate tube section and configured to capture an inner pressure measurement of the flowing fluid, an outer pressure sensor disposed on an outer curvature portion of the arcuate tube section and configured to capture an outer pressure measurement of the flowing fluid, and processing circuitry. The processing circuitry may be configured to receive the inner pressure measurement and the outer pressure measurement, determine a pressure difference between the inner pressure measurement and the outer pressure measurement, and determine a mass flow rate of the flowing fluid passing through the arcuate tube section based on the pressure difference and a fluid density of the flowing fluid.

A mass flow meter includes an arcuate tube section that is semi-circular, an inner pressure sensor disposed on an inner curvature portion of the arcuate tube section and configured to capture an inner pressure measurement of the flowing fluid, an outer pressure sensor disposed on an outer curvature portion of the arcuate tube section and configured to capture an outer pressure measurement of the flowing fluid, and processing circuitry. The processing circuitry may be configured to receive the inner pressure measurement and the outer pressure measurement, determine a pressure difference between the inner pressure measurement and the outer pressure measurement, and determine a mass flow rate of the flowing fluid passing through the arcuate tube section based on the pressure difference and a fluid density of the flowing fluid.

A metering bank for an air cart. The metering bank includes metering bank frame and a plurality of meter modules disposed laterally adjacent to one another in the metering bank frame. Each of the plurality of meter modules is independently removable from the metering bank in a direction generally parallel with the forward direction of travel of the air cart. Each of the plurality of meter module includes a metering mechanism.

A metering bank for an air cart. The metering bank includes metering bank frame and a plurality of meter modules disposed laterally adjacent to one another in the metering bank frame. Each of the plurality of meter modules is independently removable from the metering bank in a direction generally parallel with the forward direction of travel of the air cart. Each of the plurality of meter module includes a metering mechanism.

A sensor assembly for determining yield of grain harvested by a harvesting machine during harvesting operations. The sensor assembly includes a sensor housing, a displaceable sensor member and a displacement sensor. The sensor housing is mounted to the grain elevator housing above an upper sprocket of a conveyor disposed within the grain elevator housing. The sensor member is displaceably supported via the sensor housing within the elevator housing above the upper sprocket and along a direction of travel of the grain piles thrown by the conveyor flights rotating around the upper sprocket. The thrown grain piles produce a grain force on the sensor member causing a displacement of the sensor member in relation to the grain force. The displacement sensor generates a grain force signal corresponding to the displacement of the sensor member.