Anatel Corporation

Millipore Corporation

David Allen Pane

Frederick K Blades

Paul Charles Melanson

John Stillian

James A Valdez

Yasuo Yamamori

Gast&oacute;n De Los Reyes

Wisam Yacteen

John R Stillian

Jay Darol Rasmussen

Lawrence K De Martin

Robert L Garvin

Nick R Jancewicz

The present invention provides a device useful in the photo-oxidation of a sample liquid and in the measurement of the oxidized carbon content thereof. The device includes a cell, at least two elongate probes, and a temperature sensitive element. The cell includes a rigid light-transmissive outer wail that encloses a continuous predetermined internal volume The elongate probes&mdash;providing collectively the ability to measure temperature and conductivity&mdash;penetrate through the rigid outer wall and extend substantially into the cell's internal volume. At least one of the elongate probes is hollow at least partially along its length, the temperature sensitive element being positioned within this bore. A methodology involving the use of the device is also described.

Device for measuring the oxidizable carbon of a liquid and a method for the use thereof

An improved instrument for measuring the total organic carbon content of water provides substantially instantaneous TOC measurements that are repetitively calibrated, provides substantially improved accuracy of results in a circuit providing improved noise rejection, allowing faster response, and provides controlled dilution of the sample stream to extent the useful range of the instrument.

Instruments for measuring the total organic carbon content of water

An improved measurement cell and circuit for measuring the electrical characteristics of a liquid sample during exposure to radiation includes a glass cell formed of a main tube extending generally parallel to an elongated lamp emitting the radiation, and a pair of electrodes disposed axially within the sample tube. In the preferred embodiment, the ends of the cell are formed of glass twinbore tubing fused to the glass main tube, the bores retaining ends of the electrodes. Inlet and outlet tubes and a temperature sensing well may also be fused to the main tube. In an implementation for measurement of TOC in water by oxidation to CO.sub.2, the source comprises a low pressure mercury vapor lamp, and the electrodes are formed of solid Ti with catalytic TiO.sub.2 surfaces. The circuit used to monitor variation in electrical characteristics of the liquid during UV exposure controls flow of power to op-amps in order to multiplex a drive signal between the UV exposure cell, a calibration resistor, and a temperature sensor.

Cell and circuit for monitoring photochemical reactions

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Lyons, CO, United States of America

David Allen Pane