A gas meter having a sensor module and at least one bypass module is described herein. In an example of the gas meter, an enclosure defines an interior cavity within which a manifold may be configured to include a sensor module connector, at least one bypass module connector, and an exhaust port. A sensor module may be connected to the sensor module connector of the manifold and may measure a flowrate through the sensor module and into the manifold. A bypass module may be connected to the bypass module connector of the manifold to bypass gas around the sensor module. A processor may be used to compute a gas flowrate through the meter using inputs including the measured flowrate and data based on the measured flowrate to adjust for gas that bypassed the sensor module.

Provided are a heater that heats a fluid, and a temperature detector that detects a temperature of the fluid, and a flow rate of the fluid flowing through a main channel is corrected based on a tendency of a detection value detected by the temperature detector to change over time.

A system for measuring a flow rate of a fluid containing liquid includes a body in which the fluid flows, at least one rotor configured to be rotated by the fluid, and a device for measuring a rotation speed of the rotor. The measuring device includes an optical module configured to transmit an incident light radiation on vanes of the rotor, in a direction substantially perpendicular to an axis of rotation of the rotor and receive a reflected light radiation coming from the vanes. The measuring device further includes a conversion module configured to determine the rotation speed of the rotor according to the reflected light radiation and determine the flow rate of the fluid.

Disclosed is a flow rate controller in which a clear width (6) of a control gap (4) between a main part (3) and a control element (2), which is deformable according to the pressure in order for the flow rate through the control gap (4) to be kept constant, can be adjusted as a result of the fact that at least one supporting element that adjusts the clear width (6) of the control gap (4) is designed to be movable relative to a main part (3).

The flow rate measuring method is performed in a common gas supply system comprising a plurality of gas supply paths each having a first valve, and a gas measuring device formed downstream side of the plurality of gas supply paths, having a pressure sensor, a temperature sensor, and a downstream side second valve. The flow rate measuring method includes: a first step of opening any one of the first valves and the second valve to allow gas to flow, closing the second valve while gas is flowing, and closing the first valve after a predetermined time has elapsed, and then measuring a pressure and a temperature after the first valve has been closed; a second step of opening any one of first valves and the second valve to allow gas to flow, closing the any one of the first valve and the second valve at the same time while gas is flowing, and then measuring a pressure and temperature after the first valve and the second valve have been closed; and a third step of calculating the flow rate in accordance with the pressure and temperature measured in the first step and the pressure and temperature measured in the second step.

A flowmeter is disposed in a passage through which a fluid flows. The flowmeter includes a first passage and a second passage. The first passage defines an opening through which a part of the fluid flows into the flowmeter from the passage. The second passage branches off from the first passage and includes a flow rate detector configured to detect a flow rate of the fluid flowing through the second passage from the first passage. The second passage has one end at which the second passage branches off from the first passage and the other end. The second passage includes at least one end opening at the other end and an inflow reducer configured to restrict the fluid from flowing into the second passage through the at least one end opening.

According to the present invention, it is possible to provide a flow rate measurement device capable of accurately measuring a flow rate of a measurement target gas by improving anti-contamination property. A flow rate measurement device (20) of the present invention includes a board (304) disposed along a flow direction of a measurement target gas (2) in a sub passage (134), a support body (401) that is disposed to face one surface (304a) of the board, and a flow rate sensor (411) that is supported by the support body, faces the one surface of the board, and measures a flow rate of the measurement target gas passing between the support body and the board. The sub passage includes a first passage portion D1 between the support body and one surface of the board, a second passage portion D2 between the other surface of the board and a passage wall surface of the sub passage opposed thereto, and a third passage portion D3 between the support body and the passage wall surface of the sub passage that faces the support body. The support body has a first side surface (407) that faces in the flow direction of the measurement target gas in the sub passage.

According to the present invention, it is possible to provide a flow rate measurement device capable of accurately measuring a flow rate of a measurement target gas by improving anti-contamination property. A flow rate measurement device (20) of the present invention includes a board (304) disposed along a flow direction of a measurement target gas (2) in a sub passage (134), a support body (401) that is disposed to face one surface (304a) of the board, and a flow rate sensor (411) that is supported by the support body, faces the one surface of the board, and measures a flow rate of the measurement target gas passing between the support body and the board. The sub passage includes a first passage portion D1 between the support body and one surface of the board, a second passage portion D2 between the other surface of the board and a passage wall surface of the sub passage opposed thereto, and a third passage portion D3 between the support body and the passage wall surface of the sub passage that faces the support body. The support body has a first side surface (407) that faces in the flow direction of the measurement target gas in the sub passage.

A gas leak sensing device includes a constant flow rate control valve, a pressurization control valve, a supply-side gas circuit, a master-side gas circuit, a workpiece-side gas circuit, an equal pressure valve, an exhaust valve, a test pressure sensor, and a differential pressure sensor. The supply-side gas circuit is connected with the constant flow rate control valve and the pressurization control valve. The equal pressure valve performs opening and closing between the supply-side gas circuit and the master-side gas circuit and opening and closing between the supply-side gas circuit and the workpiece-side gas circuit. The exhaust valve performs opening and closing between the workpiece-side gas circuit and outside. The test pressure sensor detects pressure in the supply-side gas circuit. The differential pressure sensor detects a differential pressure between the master-side gas circuit and the workpiece-side gas circuit.

Devices, systems, and methods are provided for improved heat transfer LIDAR. A LIDAR device may comprise a LIDAR housing configured to attach to a vehicle to detect one or more objects in the field of view of the LIDAR device, wherein the LIDAR housing encloses one or more gases, wherein the one or more gases have a characteristic of being more thermal conductive than air. The LIDAR device may comprise one or more windows allowing light signals to pass through, wherein the one or more windows are attached to one or more walls of the LIDAR housing. The LIDAR device may comprise a rotating platform situated inside the LIDAR housing and configured to rotate around a center axis relative to the LIDAR housing. The LIDAR device may comprise one or more light signal transmitters configured to transmit first light signals through the one or more windows. The LIDAR device may comprise one or more light signal receivers configured to detect second light signals reflected by the one or more objects towards the LIDAR device.