Horiba, Ltd.

Kazuo Hanada

Masayoshi Shinohara

Yoshinori Otsuki

Ichiro Asano

Kenji Kondo

Shun Fukami

Yoshihisa Onda

Steve Kerrigan

To provide an exhaust gas sampling mechanism which can prevent condensed water droplets in exhaust gas from being sampled by a sampling probe and advantageously sample only the gas components of the exhaust gas to be measured, thereby maintaining a high response speed in analyzing the exhaust gas, the exhaust gas sampling mechanism includes the sampling probe disposed in a flow path through which the exhaust gas flows, for sampling the exhaust gas; and a gas-permeable cover which covers at least an upstream portion or a lateral surface portion of the sampling probe in the flow path, and has a water droplet removing structure.

Exhaust gas sampling mechanism and exhaust gas analysis apparatus

The present invention is one that, even while cooling exhaust gas without dilution, makes it possible to accurately measure particle concentration, and provided with: a particle concentration measurement device; a sampling cooling pipe that cools the exhaust gas collected from an exhaust gas transfer pipe to a measurable temperature of the particle concentration measurement device without dilution, and introduces the cooled exhaust gas into the particle concentration measurement device; a temperature sensor that detects temperature of the exhaust gas flowing into an exhaust gas inlet; and a calculation device that, from the detected temperature by the temperature sensor and the temperature of the exhaust gas introduced into the particle concentration measurement device, corrects measured particle concentration by the particle concentration measurement device in real time to calculate the particle concentration of the exhaust gas flowing through the exhaust gas transfer pipe.

Exhaust gas analysis system and exhaust gas analysis program

To improve an offset accuracy in a particle number counting apparatus () condensing a working liquid with sample particles, the apparatus including:

Particle number counting apparatus

A method of measuring characteristics of a critical orifice type constant flow rate instrument is applied to a dilution mechanism including dilution units in series. Diluent gas of one dilution unit and diluent gas of the other dilution unit are kept flowing in a derivation flow passage for deriving redundant gas of the corresponding one dilution unit in a manner that the total flow rate thereof is equal to a prescribed constant flow rate and that the flow rate of the diluent gas from the corresponding dilution unit is equal to the flow rate in use. The flow rate characteristics of the critical orifice type constant flow rate instrument are measured based on at least an upstream side pressure of the critical orifice type constant flow rate instrument provided in the derivation flow passage at this time.

Method of measuring characteristics of critical orifice type constant flow rate instrument for use in multistage dilution mechanism

In a gas analyzerand a gas analyzing systemadapted to introduce and analyze a part of a measurement target gas flowing through a measurement target gas flow passage, in order to ensure accuracy in controlling the measurement target gas flowing through the measurement target gas flow passageand accuracy in its own and other measurements, there are provided an object measurement deviceadapted to acquire a part of the measurement target gas introduced from the measurement target gas flow passageso as to measure a quantity etc. of a measurement object contained in the measurement target gas, an acquired gas flow rate measurement deviceadapted to measure a flow rate of the measurement target gas acquired by the object measurement device, and a gas supply deviceadapted to supply another gas of a flow rate equal to the gas flow rate measured by the acquired gas flow rate measurement deviceto a portion downstream of a shunt point in the measurement target gas flow passage

Exhaust gas analyzing system

An object of this invention is to improve resistance to heat and to increase a measurable range of a pressure without increasing a cost. In order to attain the object, a first unit arranged near an exhaust gas pipe and a second unit arranged separately from the first unit and connected to the first unit through a connecting pipe are provided, and the first unit has an exhaust gas flow channel from one end of which an exhaust gas is introduced, an orifice part arranged in a midst of the exhaust gas flow channel, a pressure rising check valve of a mechanically operating type that is connected to a downstream side of the orifice part in the exhaust gas flow channel, and a dilution gas flow channel that is connected to a downstream side of the orifice part in the exhaust gas flow channel so that the diluted exhaust gas diluted by the dilution gas is derived from the other end of the exhaust gas flow channel.

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Kyoto, Japan

Kazuo Hanada