Olympus Optical Company, Ltd.

Tadao Yamamoto

Hiroshi Takekawa

Kiyozo Koshiishi

Taichi Banno

Nobuyoshi Suzuki

Toshio Tsurukawa

Kunihiko Matsumura

Yasuhiko Tanaka

Sadao Tezuka

A flowcell for containing sample solutions is surrounded by an electric heater which is then surrounded by an isothermal frame having a large heat capacity, and a Peltier element serving as a cooling source is coupled with the isothermal frame. A heat delaying plate is arranged between the flowcell and heater and a temperature sensor is arranged between the flowcell and the heat delaying plate. The Peltier element is controlled in such a manner that the temperature of the isothermal frame is maintained substantially at a constant temperature lower than a predetermined temperature at which the sample solution is to be kept. The heater is controlled in accordance with a difference between the temperature of the sample solution and the predetermined temperature.

Liquid containing vessel with temperature control device

In the disclosed method, ion activity is measured by placing a cup filled with a test solution to be measured on a cup receiver, lifting a cup lifting arm to engage the cup receiver with a rotary plate, rotating the rotary plate to stir the test solution in the cup, measuring a potential difference between a reference electrode and other electrodes after completion of the stirring of the solution, and indicating the ion activity as a function of the potential differences.

Method for measuring ion activity

In an apparatus for measuring ion activity, a reference electrode and an at least one test electrode project through an opening in a rotating plate while a cup receiver which holds a cup filled with the test solution is lifted from a disengaged position into a position where the cup receiver engages and is rotated by the rotating plate while the electrodes project into the solution. A measuring circuit connected to the electrodes measures the ion activity with the use of a reverse logarithmic amplifier.

Apparatus for measuring ion activity

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Machida, Japan

Tadao Yamamoto