Horiba, Ltd.

Satoshi Inoue

Shigeyuki Akiyama

Masahiko Fujiwara

Takuji Oida

Ichiro Asano

Nobutaka Kihara

Masahiko Ishida

Naohito Shimizu

Masahiko Endo

Norikazu Iwata

This invention relates to a multi-component absorbance monitor, and the object is to provide a general-purpose and highly accurate compact absorbance monitor. Disclosed is an absorbance monitor including a light source, a sample cell and a plurality of detectors as elements, wherein a light collecting member is arranged between the light source and one detector, and an inside wall of the light collecting member has a site for guiding a part of light from the light source, that is, a light guiding opening, and light from the light guiding opening enters another detector. Preferably, the light collecting member lies between the light source and the sample cell. Preferably, an optical element used for another detector described above is arranged in the light guiding opening and adjacently to a light path formed by the light collecting member.

Absorbance monitor

The present invention provides a NOx-concentration measuring apparatus D for quantitatively analyzing the concentration of NOx contained in a sample gas. The measuring apparatus D comprises a sampling probe for obtaining the sample gas, a drain separatorfor condensing moisture contained in the sample gas as a condensed water and separating the condensed water from the sample gas, an NOconverterfor converting NOcontained in the sample gas into NO, a secondary cooling devicefor additionally cooling the sample gas, and an NO analyzer, arranged in this order with respect to a sample-gas line of the NOx-concentration measuring apparatus. The drain separator is a high-flow-velocity cooling type drain separator. Further, the sample-gas line between the sampling probe and the drain separator is heated and/or thermally insulated over the entire length thereof. The measuring apparatus can provide a high-precision measurement while suppressing NOloss.

NOx-concentration measuring apparatus

A gas analyzing apparatus includes a sample gas line with a sample line valve for providing a sample gas, and a reference gas line with a reference line valve for providing a reference gas. A first gas analyzer is connected to the sample line downstream of the sample line valve, and a second gas analyzer is connected to both the sample and reference gas lines downstream of the valves. The lines are configured such that sample gas and reference gas may be alternately provided to the second gas analyzer either directly or indirectly via the first gas analyzer.

Gas analyzing apparatus

A gas analyzer capable of simultaneously detecting two or more components in a single-cell mode and a gas-analyzing mechanism suitable for simultaneously detecting two or more components in a cross-flow modulation single-cell mode are provided. A gas analyzer unit includes two measuring cells, light sources provided on one end side of each of the measuring cells, gas filter cells with interferential gaseous components hindering a detection of components to be measured enclosed provided on the other end side of each of the measuring cells, beam splitters included in two gas filter cells, first- and fourth and second- and third detectors provided on the side of transmitting position and the side of reflecting position, respectively, of each of the beam splitters and a sampling device connected with a rotary valve.

Gas analyzer and gas-analyzing mechanism

A temperature compensating circuit designed in two parts, a temperature-pulse width conversion circuit (X) and a temperature compensating circuit (Y.sub.N) permit the sharing of the temperature-pulse width conversion circuit by a plurality of temperature compensating circuits. Each temperature conversion circuit is relatively uncomplicated in construction, utilizing only resistors and a switch means. The temperature-pulse width conversion circuit utilizes a temperature sensitive element, like a thermistor, in a circuit with an operational amplifier. The output of the operational amplifier is supplied to a pulse width converter for generating the pulse width signal that carries the temperature compensation factor to be used in temperatures compensating the signal received by the temperature compensating circuit.

Growing community of inventors

Kyoto, Japan

Satoshi Inoue