The present disclosure provides a multi-layer open channel portable flow measuring device based on a water impulse principle and a flow measuring method; an instantaneous water head height of a water-carrying section, namely, a water level H is measured through a pressure sensor at a bottom of a U-shaped hollow tube; at the same time, layered multi-point velocity measuring components in equidistant layout include a series of position “current meters” composed of tension sensors, hollow punching lightweight steel balls and lightweight elastic steel ropes to measure velocities V.sub.1-n of different points, n depends on the layer decided to be arranged according to a channel depth, an instantaneous flow value of the whole water-carrying section is further acquired through multi-layer flow accumulation, and with a simple structure, intelligent control, easy operation and convenient carrying, the present disclosure may further improve the flow measuring precision.

A flow sensor apparatus for monitoring a directed stream of an agricultural product from an application port of a supply tube. The directed stream has a target directed portion and an off-target portion. A sensor housing includes a conical flow receiving element and a sensor body. The receiving element has an inlet orifice at a first end and a receiving element outlet at a second end. The first end is smaller than the second end. The sensor body has a sensor inlet end positioned to receive a target directed portion of the directed stream from the receiving element outlet of the conical flow receiving element wherein an off-target portion of the directed stream is not sensed. The sensor housing and sensor element are positioned external to the application port and thus positioned to provide measurement, targeting, and timing of the agricultural product.

A flow sensor apparatus for monitoring a directed stream of an agricultural product from an application port of a supply tube. The directed stream has a target directed portion and an off-target portion. A sensor housing includes a conical flow receiving element and a sensor body. The receiving element has an inlet orifice at a first end and a receiving element outlet at a second end. The first end is smaller than the second end. The sensor body has a sensor inlet end positioned to receive a target directed portion of the directed stream from the receiving element outlet of the conical flow receiving element wherein an off-target portion of the directed stream is not sensed. The sensor housing and sensor element are positioned external to the application port and thus positioned to provide measurement, targeting, and timing of the agricultural product.

A housing includes a measurement passage through which a part of air flowing in a main passage flows. A sensor assembly is fixed on the housing and includes a circuit board. A detection element configured to output a signal in response to a flow rate of air flowing in the measurement passage and an electronic component configured to drive the detection element are mounted on the circuit board. An outer edge of the circuit board has a fractured part with a fractured shape and a cut part having a surface roughness smaller than that of the fractured part. The fractured part at the outer edge of the circuit board is not arranged in the measurement passage but provided at a position excluding the measurement passage.

A physical quantity measuring device detects a physical quantity of gas flowing in a flow passage. The physical quantity measuring device includes a sensor element that outputs a detection signal according to the physical quantity, a case that is provided to the flow passage and houses the sensor element, and a protrusion that protrudes from a passage wall surface facing the flow passage. The case includes a measurement chamber that houses the sensor element and an inflow port that is configured to cause a part of gas flowing in the flow passage to flow into the measurement chamber therethrough. The protrusion is configured to guide gas flowing along the passage wall surface toward the inflow port.

A respiratory therapy device having a diagonal feedback array, and methods for the user thereof.

A sensor assembly for use in synchronizing seed placement and the dispensing of liquid agricultural product during planting. The sensor assembly includes a signal conditioning circuit configured to provide an output signal representing an indication of the presence of liquid agricultural product and seed for use in determining the synchronization of the seed placement with the dispensing of the liquid agricultural product. The presence of both a seed mass component and a liquid mass component of the output signal defines a package mass. The output signal has a pre-defined value and is transmitted to a controller to determine whether there is an error. The controller is configured to generate an error signal that is capable of being displayable on a remote display/user interface system that can be monitored by the system operator.

A sensor assembly for use in synchronizing seed placement and the dispensing of liquid agricultural product during planting. The sensor assembly includes a signal conditioning circuit configured to provide an output signal representing an indication of the presence of liquid agricultural product and seed for use in determining the synchronization of the seed placement with the dispensing of the liquid agricultural product. The presence of both a seed mass component and a liquid mass component of the output signal defines a package mass. The output signal has a pre-defined value and is transmitted to a controller to determine whether there is an error. The controller is configured to generate an error signal that is capable of being displayable on a remote display/user interface system that can be monitored by the system operator.

An airflow calibrator 10 may generally comprise an inlet 15 in fluid communication with an outlet 20 to define a flow path 30 of a fluid through the airflow calibrator 10; a face seal valve 40 in fluid communication with the inlet 15; a removable flow cell 50 in fluid communication with the face seal valve 40; a variable restrictor valve 60 in fluid communication with the removable flow cell 50; and an optical sensor array 70 to determine the airflow, i.e., flow rate, of an air sampling pump in fluid communication with the airflow calibrator. Methods of using the airflow calibrator are also described.

An airflow calibrator 10 may generally comprise an inlet 15 in fluid communication with an outlet 20 to define a flow path 30 of a fluid through the airflow calibrator 10; a face seal valve 40 in fluid communication with the inlet 15; a removable flow cell 50 in fluid communication with the face seal valve 40; a variable restrictor valve 60 in fluid communication with the removable flow cell 50; and an optical sensor array 70 to determine the airflow, i.e., flow rate, of an air sampling pump in fluid communication with the airflow calibrator. Methods of using the airflow calibrator are also described.