Horiba, Ltd.

Haruhisa Mohara

Takeshi Kusaka

Shun Fukami

Naoto Mizutani

Masayoshi Shinohara

Masahiro Nishikawa

Shintaro Aoki

Yosuke Kondo

The present invention is one that accurately measures an exhaust gas component regardless of variation in atmospheric pressure around a test object that is a vehicle or part of it, and an exhaust gas analysis apparatus that measures component concentration in exhaust gas discharged from the test object that is the vehicle or part of it. The exhaust gas analysis apparatus includes: an exhaust gas detector that mixes the exhaust gas and reactive gas together and detects the resulting phenomenon; a pressure gauge that measures the atmospheric pressure at the time of measurement of the exhaust gas or pressure at a predetermined point inside the exhaust gas analysis apparatus as measured pressure; and a correction part that, on the basis of the measured pressure by the pressure gauge, corrects the measurement error of the exhaust gas detector associated with a variation in the supply amount of the reactive gas.

Exhaust gas analysis apparatus, exhaust gas analysis method, and correction expression creation method

The present invention includes: connecting a pressure varying device to a sample gas introduction port and a gas discharge port of a gas analysis apparatus; depressurizing or pressurizing the sample gas introduction port and the gas discharge port by the pressure varying device; introducing calibration gas from a calibration gas introduction port of the gas analysis apparatus in a depressurized or pressurized state; and calculating a pressure correction factor for the gas analysis apparatus with use of a measurement result of the calibration gas by the gas analysis apparatus.

Calibration method for gas analysis apparatus, gas analysis system, and pressure varying device

A gas analysis device is provided that is able to accurately measure a concentration or a quantity of methane contained in a sample gas even if there are variations in the pressure in the sample gas line. This gas analysis device has a sample gas line through which a sample gas flows, a pressure loss mechanism that is provided on the sample gas line, a pressure control mechanism that refers to the pressure on the forward side of the pressure loss mechanism and, by discharging a portion of the sample gas from the rearward side of the pressure loss mechanism, and by supplying a predetermined gas to the rearward side of the pressure loss mechanism, controls pressure differences in the sample gas line between the front and the rear of the pressure loss mechanism, and an analyzer that analyzes the sample gas flowing through the sample gas line.

Gas analysis device, gas sampling device and gas analysis method

In a gas analysis apparatus including analyzers that need ignition, such as FIDs, in order to make it possible to surely ignite the analyzers while downsizing the entire apparatus, the apparatus includes first and second analyzers to accept a sample gas, a first gas line provided with the first analyzer, a second gas line provided with the second analyzer and joined downstream of the first analyzer in the first gas line. At least one of the first analyzer and the second analyzer is configured to cause pressure fluctuations in the gas line including the analyzer when analyzing the sample gas. A first backflow prevention mechanism is disposed between another of the analyzers and a junction of the gas lines. The first backflow prevention mechanism is configured to prevent a fluid from flowing backward from the one of the analyzers through the junction toward the another of the analyzers.

Growing community of inventors

Kyoto, Japan

Haruhisa Mohara