katharometer
/ˌkæθəˈrɒmɪtə(r)/noun
- an instrument for detecting a gas or measuring its concentration in a mixture, by measuring changes in thermal conductivity导热析气计（一种通过测量热导率变化来测定某种气体或混合物中气体浓度的仪器）。
词源
early 20th cent.: from Greek katharos 'pure' +-METER.