Patent ID: 9551679
Date: 2017-01-24
CPC Classifications: G01K,G01N

Claim:
1. 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.