in the aspirator assembly 46 a temperature actuated flow control device 40 is connected between the aspirator assembly 46 and the connecting line 34 the flow control device 40 may be similar to that described in u s pat no 4 557 419 issued to hall and serves to permit the continuous sampling of the combustible atmosphere 14 above the dewpoint of the combustible atmosphere 14 and to stop the sampling of the combustible atmosphere 14 by the sampling analyzing system 10 whenever the temperature of the aspirating gas falls below the dewpoint of the combustible atmosphere 14 further details of such a temperature actuated flow control device are availble in the above referenced patent and the reader is referred thereto for any further required clarification the probe 16 is connected via a sample inlet line 18 to a sample orifice 20 which also is sized with respect to the outlet pressure of the main gas supply 30 and the action of the aspirator assembly 46 to provide a total sampling rate of the combustible atmosphere 14 of between 1425 and 2375 cc min with 1900 cc min being the preferred sampling rate the sample orifice 20 is connected to a connecting line 22 which is formed within the sampling analyzing assembly 10 as a series of sinusoidal paths in the same manner as the connecting line 34 discussed above in order to pre condition the gas sample before it contacts the sensor assembly 24 and the aspirator assembly 46 a resistance heater thermostat assembly 38 is located adjacent to the connecting line 22 and is thermostatically controlled to maintain the temperature.