Abstract: A measuring appliance for determining a hydrocarbon concentration in compressed air comprises a housing and the following components arranged in the housing: a main gas line with an inlet for the compressed air, and three additional gas lines, the first branching from the main gas line for compressed air to be measured, the first line connecting the main line to a first switchable valve. The second gas line branches from the main gas line, for reference compressed air, and connects the main gas line to the first switchable valve. The third gas line connects the first switchable valve to a sensor unit and includes copper. A reference gas unit is arranged in the second gas line and contains an oxidation catalyst in which the reference compressed air is produced from the compressed air. A pressure controller is arranged in the main gas line for ensuring a constant through-flow of the compressed air in the range from 3 to 16 bar.

Abstract: A purification unit for separating hydrocarbons from a gas. The purification unit comprises a converter housing suitable for conducting gases therethrough, with a catalyst material disposed therein, with the catalyst material being heated from the outside of the converter housing by means of a heat source.

Abstract: The present invention relates to a purification unit (20) for separating hydrocarbons from a gas. It comprises a converter housing (32) suitable for conducting gases therethrough, with a catalyst material disposed therein, with the catalyst material being heated from the outside of the converter housing (32) by means of a heat source (34).