Sem Corporation

Constantine D Capetanopolous

John Robert Finbow

Bryan S Hobbs

Patrick J Iannotta

Patrick J Ianotta

A gas sensing assembly from which a number of gas sensing devices can be constructed for determining the concentration of an active gas in a gas mixture. The assembly comprises a self-contained sensing unit including a sensing element at which active gas reacts and is consumed, an output signal being produced proportional to the rate of reaction of active gas. A number of different control members are provided each defining a respective gas diffusion barrier, each member being separately securable to the sensing unit and detachable therefrom while leaving the sensing unit intact to enable gas sensing devices of different sensitivities to be constructed from the same sensing unit.

Gas sensing assembly

An electrochemical gas sensor assembly comprises an electrochemical gas sensor for sensing a selected gas. A filter is provided through which gas to be sensed must pass before reaching the sensor, the filter being adapted to prevent at least one non-selected gas from reaching the sensor but permitting passage of the selected gas. A temperature control system controls the temperature of the filter.

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Dobbs Ferry, NY, United States of America

Constantine D Capetanopolous