Device for measuring the thermal conductivity of gas components of a gas mixture
AssigneeChemec Oy AB
InventorEckard Brandau
Life of this patent
Estimating the term…
Abstract
A device for measuring thermal conductivity of gas components of a gas mixture in order to determine fractions of the gas components includes a plurality of thermal conductivity sensors, each thermal conductivity sensor being a component of a resistance bridge circuit and being connected to an evaluation unit associated with the device. Each thermal conductivity sensor has a heating element and an integrated temperature measuring element, which elements generate two measuring voltages (UM3, UM2) when the temperature of the thermal conductivity sensor changes as a result of heat dissipation by the gas mixture. Voltages are compared in the evaluation unit in order to detect measuring errors.
Claims9
A device for measuring thermal conductivity of gas components of a gas mixture in order to determine fractions of the gas components, the device comprising:
- a plurality of thermal conductivity sensors, each of the thermal conductivity sensors comprising only one resistance bridge circuit and being connected to an evaluation unit associated with the device,
- wherein each of the thermal conductivity sensors has differential amplifier, a heating element and an integrated temperature measuring element, wherein the heating element and the temperature measuring element are integrally connected and the heating element comprises a single leg of the bridge circuit, the elements being configured to generate two measuring voltages when the temperature of the thermal conductivity sensor changes as a result of heat dissipation by the gas mixture, one of the measuring voltages output by the temperature measuring element and representative of the temperature of the heating element and the other one of the measuring voltages being generated from the differential amplifier being configured to convert a bridge voltage of the resistance bridge circuit into a mass-related voltage signal, and
- wherein the evaluation unit is configured to compare the two measuring voltages so as to detect measuring errors.
Dependencies are inferred from the claim text.