A concentration measuring device includes a circulation passage, an aspirator, a differential pressure sensor, and a control unit. The aspirator is disposed in a fuel tank and is connected to the circulation passage. While a gas flows from a gaseous layer within a fuel tank through the circulation passage due to a negative pressure generated in the aspirator, the differential pressure sensor measures a pressure difference of the gas within the circulation passage between an upstream side of a narrowed part, having a narrower passage area than an adjacent portion of the circulation passage, and a downstream side of the narrowed part. The control unit is configured to calculate a density of the fuel vapor from the pressure difference of the gas and to calculate a concentration of the fuel vapor from the density of the fuel vapor.

A gas measuring apparatus for a secondary battery comprises: a chamber accommodating a secondary battery therein; a heater unit applying heat to the chamber to ignite the secondary battery accommodated in the chamber; a collection tube connected to the inside of the chamber to collect a gas generated in the secondary battery; a vacuum unit connected to the collection tube to vacuumize the inside of the chamber so as to introduce the gas into the collection tube; and a gas measuring unit measuring an amount of gas introduced into the collection tube.

A gas measuring apparatus for a secondary battery comprises: a chamber accommodating a secondary battery therein; a heater unit applying heat to the chamber to ignite the secondary battery accommodated in the chamber; a collection tube connected to the inside of the chamber to collect a gas generated in the secondary battery; a vacuum unit connected to the collection tube to vacuumize the inside of the chamber so as to introduce the gas into the collection tube; and a gas measuring unit measuring an amount of gas introduced into the collection tube.

Systems and methods for measuring air within a fluid and for mitigating damage to a metalworking tool are disclosed. A system for measuring air within a fluid includes a fluid path having a first end and a second end; a first valve having an open position and a closed position, wherein fluid can pass through the first valve in the open position and fluid is prevented from passing through the first valve in the closed position; a first sensor located between the first valve and the second end; and a second sensor located between the first sensor and the second end, wherein the second end is higher than the first end.

Systems and methods for measuring air within a fluid and for mitigating damage to a metalworking tool are disclosed. A system for measuring air within a fluid includes a fluid path having a first end and a second end; a first valve having an open position and a closed position, wherein fluid can pass through the first valve in the open position and fluid is prevented from passing through the first valve in the closed position; a first sensor located between the first valve and the second end; and a second sensor located between the first sensor and the second end, wherein the second end is higher than the first end.

Disclosed herein is a device for measuring physicochemical properties with regard to gases in contact with a material, especially material transport properties with regard to gases in contact with a material and mechanical properties, comprising: an upper end, in which a pressure sensor connected to an apparatus for recording and optionally processing a signal is hermetically inserted; a lower end in communication with the pressure sensor and which is open in order to allow (i) insertion of the measuring device into the material and (ii) formation of a gaseous chamber between the pressure sensor and the material when the measuring device is inserted therein; a system for scavenging a gas; at least one means for introducing the gas into the device, and advantageously at least one means for removing the gas from the device; the device made from a material which does not absorb the gas.

Disclosed herein is a device for measuring physicochemical properties with regard to gases in contact with a material, especially material transport properties with regard to gases in contact with a material and mechanical properties, comprising: an upper end, in which a pressure sensor connected to an apparatus for recording and optionally processing a signal is hermetically inserted; a lower end in communication with the pressure sensor and which is open in order to allow (i) insertion of the measuring device into the material and (ii) formation of a gaseous chamber between the pressure sensor and the material when the measuring device is inserted therein; a system for scavenging a gas; at least one means for introducing the gas into the device, and advantageously at least one means for removing the gas from the device; the device made from a material which does not absorb the gas.

The purpose of the present invention is to provide a determining device and a determining method to determine whether an inspected jet nozzle is defective by inspecting the jet nozzle for injecting a jet stream with long ground penetrating distance at a stage before installing in a construction site where a large diameter jet grouting method is used. To achieve this purpose, with this invention, in which a nozzle to be inspected is mounted onto an outlet port, a jet stream is ejected from a jet stream generating device, and measurement data measured by a pressure sensing unit when the jet stream impacts the pressure sensing unit is processed with a controlling device (for example, a computer), a nozzle to be inspected is determined to be a non-defective product if a first ratio is no less than a first prescribed value, a second ratio is no less than a second prescribed value, and a third ratio is no less than a third prescribed value.

The purpose of the present invention is to provide a determining device and a determining method to determine whether an inspected jet nozzle is defective by inspecting the jet nozzle for injecting a jet stream with long ground penetrating distance at a stage before installing in a construction site where a large diameter jet grouting method is used. To achieve this purpose, with this invention, in which a nozzle to be inspected is mounted onto an outlet port, a jet stream is ejected from a jet stream generating device, and measurement data measured by a pressure sensing unit when the jet stream impacts the pressure sensing unit is processed with a controlling device (for example, a computer), a nozzle to be inspected is determined to be a non-defective product if a first ratio is no less than a first prescribed value, a second ratio is no less than a second prescribed value, and a third ratio is no less than a third prescribed value.

A flow rate verification unit that uses the pressure variation value per unit time of a pressure measurement value measured by a pressure gauge and a temperature measurement value measured by a thermometer in a state where a second shut-off valve is closed to calculate the volume between a flow-rate control valve and the second shut-off valve and verifies the flow rates of mass flow controllers one at a time, wherein a first verification side connection part attachably and detachably connected to an integrated gas unit is provided upstream from the pressure gauge and a serially connected verification gas input valve, verification side mass flow controller, and verification side flow rate control valve are provided in parallel with the second shut-off valve.