Horiba, Ltd.

Other

Nippon Sanso Corporation

Ryosuke Fukushima

Yoshio Ishihara

Tadahiro Ohmi

Masahiko Ishida

Hiroshi Fujii

Tatsuhide Tsutsui

Shuzi Takada

An oil concentration meter includes a sample cell for receiving an oil sample that can be irradiated with infrared rays from a light source. A first interference filter having a design wavelength of 3.4 .mu.m is positioned before a measuring detector, while a second interference filter transmitting a band range between 1 .mu.m and 5 .mu.m is positioned in front of a reference detector. A logarithm of the ratio of the reference detector output to the measuring detector output is used for determining the oil concentration in a sample.

Infrared oil-concentration meter

An electric conductivity-measuring cell comprises a pressure container serving also as an outer electrode and provided with an inlet port of a liquid to be measured and an outlet port and an inner electrode provided within said pressure container so as to simplify it in construction and improve a measurement in accuracy.

Electric conductivity measuring cell

A method capable of accurately and inexpensively measuring a very small quantity of impurities, such as water, contained in chemical substances, which are gaseous at normal temperature and pressure, is provided. A concentration of a very small quantity of impurities, contained in the chemical substances, which are gaseous at normal temperature and pressure, is measured by introducing the chemical substances into a cell under the condition of liquefied gases to measure an electric conductivity of the liquefied gases.

Method of measuring very small quantity of impurity in gas

Growing community of inventors

Kyoto, Japan

Ryosuke Fukushima