Abstract: The invention is directed to an arrangement for blocking the operation by an intoxicated operator of a machine or a motor vehicle. The arrangement has a measuring apparatus which determines the blood alcohol content of the operator and an evaluation unit connected to the machine or motor vehicle. The evaluation unit receives measurement data supplied by the measurement apparatus and enables the machine or motor vehicle when the measurement data satisfies at least one predetermined condition. The arrangement is improved in that the sobriety of the operator is recognized before the starting operation of the machine or motor vehicle without it being necessary to supply a breath sample. The measuring apparatus includes a gas sensor which is a sensor for measuring the blood alcohol content via permeation through the skin of the operator. The measuring apparatus is configured so that it can be worn by the operator preferably on the leg or arm.

Abstract: The combination of the invention includes a mouthpiece 1 and a sample-taking system 8 for analyzing a gas sample. The mouthpiece 1 has a flow resistor 5 in the exhalation direction and a sample-taking connecting element 6 for the gas sample to be analyzed. The sample-taking system 8 has a pump and a through-flow measuring device 13. The pump pumps the sample gas flow from the sample-taking connecting element via a sample line 9 into a measuring chamber 15 of an analyzer 16. The combination is improved in such a manner that calibration is made possible with a calibrating gas flow greatly reduced compared to the flow of gas to be measured. This is achieved in that the sample-taking connecting element 6 is connected to the mouthpiece 1 forward of the flow resistor 5 viewed in the exhalation direction. The sample line 9 includes a flow throttle 11 in through-flow direction and an outlet opening 12 opening to the ambient.

Abstract: The invention is directed to a measuring sensor for detecting gaseous components which operates in the diffusion limit current region. The measuring sensor includes a support body and has an electrolyte chamber partitioned by a diffusion membrane from the ambient containing the gaseous components. The measuring electrode of the measuring sensor is improved so that a simpler manipulation for covering the electrolyte chamber with a membrane is possible without endangering the mechanical stability of the membrane. During operation, the detection operation is intended to take place completely at that electrode surface which is in direct electrochemical exchange communication with the electrolyte supply. For this purpose, the coating is configured as an adherent layer to the support body so that it forms an impermeable adherence region in the lateral direction between coating and support body.

Abstract: The invention is directed to a measuring sensor for detecting gaseous components which operates in the diffusion limit current region. The measuring sensor includes a support body and has an electrolyte chamber partitioned by a diffusion membrane from the ambient containing the gaseous components. The measuring electrode of the measuring sensor is improved so that a simpler manipulation for covering the electrolyte chamber with a membrane is possible without endangering the mechanical stability of the membrane. During operation, the detection operation is intended to take place completely at that electrode surface which is in direct electrochemical exchange communication with the electrolyte supply. For this purpose, the coating is configured as an adherence joiner to the support body so that it forms an impermeable adherence region in the lateral direction between coating and support body.