The present disclosure relates to a thermal flowmeter comprising at least one measurement sensor having at least one sensor element for determining a measured value for determining the flow rate of a medium. A measurement transducer determines the flow rate using the determined measured value. A tubular connecting element connects the measurement sensor to the measurement transducer and a protective sleeve is provided, which is mechanically connected to the tubular connecting element. The protective sleeve has a sleeve casing having at least two openings, an inflow opening through which the medium can be delivered to the measurement sensor and an outflow opening through which the medium can flow out of the measurement sensor. The connection between the protective sleeve and the tubular connecting element is a connection which is positively engaged at least in part.

A physical quantity measurement device measures a physical quantity of a fluid. A detection unit has a physical quantity detector that detects a physical quantity of the fluid in a measurement flow channel. A housing accommodates at least a part of the detection unit and forms the measurement flow channel. The housing includes a housing attachment that is attached to a predetermined attaching target, and a position holder holding a position of the detection unit by contacting the detection unit. The housing includes an inward part positioned inward of the attaching target and an outward part positioned outward of the attaching target. The position holder is provided inward of the housing attachment in an alignment direction along which the inward part and the outward part are aligned.

An air flow meter includes an inward part that is positioned inward of an intake pipe and an outward part that is positioned not inward but outward of the intake pipe. The air flow meter further includes a first detector provided in the inward part, and a second detector provided at a position closer to the outward part than the first detector.

A method of deriving a conclusion of the condition of slurry flow in a non-vertical conduit includes artificially generating a first locally heated spot on an interior surface of the conduit at the invert of the conduit and artificially generating a second locally heated spot on the interior surface of the conduit at a location angularly spaced from the first heated spot at an angular spacing of at least 90. The temperatures of the heated spots are measured, obtaining first and second temperature values T1, T2. Electronically generated signals carrying the values T1, T2 are communicated to an electronic computing device. The computing device automatically calculates a first temperature difference T1 minus T2 and automatically derives a conclusion of the condition of slurry flow prevailing in the conduit based on the relationship between the value of the first temperature difference and a first reference parameter.

A diagnostics system comprising a controller for controlling operations of a mass flow controller. The controller is communicable coupled to at least one sensor and to a valve and tuned to control the valve based on a predetermined set point value and communication from the at least one sensor. The controller determines at least one predetermined value associated with a reverse flow of a fluid and either cause the controller to enter a hard fault or a safe state. The predetermined value of the flow is either a percentage of total flow or a percentage of total flow over a time period. The controller can log the date, time, and a device identifier in response to determining the at least one predetermined value. In addition, the diagnostics system can include a centralized controller configured to receive diagnostics data from a plurality of controllers and control operation of the controllers.

A sensor for determining at least one parameter of a fluid medium, in particular an intake air mass flow of an internal combustion engine, flowing through a measuring channel is provided. The sensor includes a sensor housing, in particular a plug-in sensor that is introduced or introducible into a flow tube and in which the measuring channel is formed, and at least one sensor chip situated in the measuring channel for determining the parameter of the fluid medium. The sensor housing includes an electronics compartment for accommodating an electronic module, and an electronics compartment cover for closing the electronics compartment. The electronics compartment cover has electrically conductive properties at least in part. The electronic module is electrically conductively connected to an interior of the electronics compartment cover.

A mass flow sensor is provided with reduced zero point fluctuation, and a mass flow meter and a mass flow controller using the mass flow sensor, the mass flow sensor comprising a U-shaped flow path passage in which a fluid flows from first end to a second end, having a bottom portion and two straight portions connecting the bottom portion to the ends, a first thermal resistor wound around one of the straight portions, a second thermal resistor wound around the same straight portion as the first thermal resistor and provided away from the first thermal resistor toward the second end, and a heat dissipating portion provided so as to be in contact with the flow path passage on the side opposite to the second thermal resistor across the first thermal resistor.

Provided is an airflow meter with good precision. In the airflow meter, which is provided with an arithmetic circuit that incorporates air temperature and a sensor module temperature as adjustment elements for the output characteristics of the airflow meter, corrects the output characteristics in accordance with the temperature difference between the air temperature and the sensor module temperature and reduces the correction amount when the absolute value of the difference between the air temperature and the sensor module temperature is small.

Provided is a thermal type flowmeter including: a resin channel member; a plate member defining, together with the channel member, a measuring channel used for measuring a liquid flow rate; and a sensor unit having a heating resistor that transfers heat to the plate member and a temperature detecting resistor that determines a temperature of the plate member. The channel member includes a flat surface in which a first groove is formed, an inflow channel having a circular cross section connected to one end in axis direction along the axis of the first groove, and an outflow channel having a circular cross section connected to the other end in the axis direction of the first groove, and inner diameters of positions of the flat surface at which the inflow channel and the outflow channel are opened, respectively, are larger than the width of the first groove.

A gas flow control system for delivering a plurality of gas flows. The gas flow control system has a gas flow path extending from a gas inlet to first and second gas outlets. First and second flow restrictors are operably coupled to the gas flow path. First and second valves are operably coupled to the gas flow path such that when both first and second valves are in a fully open state, flows of gas from the first and second gas outlets are split according to the impedances of the first and second flow restrictors.