Abstract: A device for determining a concentration of at least one gas in a sample gas flow by infrared absorption spectroscopy. The device includes an infrared radiation source which emits a radiation which is conducted through an analysis cell, a feed line, the sample gas flow which is conducted into and out of the analysis cell via the feed line, a detector which measures an absorption spectrum arising in the analysis cell, a suction jet pump which includes a propellant gas connection, and a propellant gas line which extends to the propellant gas connection of the suction jet pump. The suction jet pump is arranged downstream of the analysis cell and feeds the sample gas flow through the analysis cell via the feed line. The propellant gas line includes a regulating valve which regulates a propellant pressure in the propellant gas line.

Abstract: A device for determining a concentration of at least one gas in a sample gas flow by infrared absorption spectroscopy. The device includes a gas cell which includes a thermal insulation, a chamber, a heating source arranged within the thermal insulation which heats the sample gas flow to a desired temperature, and a sample gas duct having an outlet. The sample gas duct is heated by the heating source upstream of the outlet. An infrared radiation source emits a radiation which is conducted through the chamber of the gas cell. The sample gas flow is conducted into the chamber and into the radiation. A detector has the radiation exiting the chamber conducted thereto to determine an absorption spectrum.

Abstract: A device for determining a concentration of at least one gas in a sample gas flow by infrared absorption spectroscopy. The device includes an infrared radiation source which emits a radiation which is conducted through an analysis cell, a feed line, the sample gas flow which is conducted into and out of the analysis cell via the feed line, a detector which measures an absorption spectrum arising in the analysis cell, a suction jet pump which includes a propellant gas connection, and a propellant gas line which extends to the propellant gas connection of the suction jet pump. The suction jet pump is arranged downstream of the analysis cell and feeds the sample gas flow through the analysis cell via the feed line. The propellant gas line includes a regulating valve which regulates a propellant pressure in the propellant gas line.

Abstract: A device for determining a concentration of at least one gas in a sample gas flow by infrared absorption spectroscopy. The device includes a gas cell which includes a thermal insulation, a chamber, a heating source arranged within the thermal insulation which heats the sample gas flow to a desired temperature, and a sample gas duct having an outlet. The sample gas duct is heated by the heating source upstream of the outlet. An infrared radiation source emits a radiation which is conducted through the chamber of the gas cell. The sample gas flow is conducted into the chamber and into the radiation. A detector has the radiation exiting the chamber conducted thereto to determine an absorption spectrum.