| 摘要 |
<p>In prior art devices for analysing gases by the heat conductivity process, temperature-dependent resistors (RM), generally thermistors, are heated by a constant current and exposed to the gas to be measured. The measuring resistor (RM) is cooled dependently upon the heat conductivity of the gas to be measured. Such devices have the drawback that, when the gas to be measured is changed, the temperature-dependent resistor (RM) with the bearer and a protective layer must be heated or cooled to the new temperature, resulting in a considerable time constant. In the present invention, the temperature of the measuring resistor (RM) is kept constant, thus considerably shortening the time constant. The invention is used in gas analysers using the heat conductivity process.</p> |
