Monitoring system with a gas measuring device

A monitoring system for monitoring a gas composition of a breathing gas supply of an airplane pilot in airplanes or aircraft, the monitoring system comprising:

• a measuring line from a measuring location through a gas inlet at the monitoring system for a breathing gas mixture;
• a gas transport module configured to feed defined quantities of the breathing gas mixture via the measuring line, from the measuring location through the gas inlet at the monitoring system;
• a gas measuring device, the gas measuring device comprising:
• a moisture sensor configured to determine a moisture content in the breathing gas mixture;
• a pressure sensor configured to determine a pressure level in the breathing gas mixture;
• a temperature sensor configured to determine a temperature of the breathing gas mixture;
• a thermoelectric device comprising thermocouples or thermopiles;
• an electromagnetic device comprising coils and magnetically conductive materials and arranged at the thermoelectric device;
• an infrared optical device comprising a radiation source, a measuring element and a reference element;
• a control and analysis unit configured to organize, to check, to control or to regulate a course of a measurement-based monitoring of the breathing gas supply, wherein the moisture sensor is configured with the control and analysis unit to determine a value that indicates a moisture content or a water content in the breathing gas mixture, wherein the pressure sensor is configured in combination with the control and analysis unit to determine a value that indicates a pressure level of the breathing gas mixture, wherein the temperature sensor is configured in combination with the control and analysis unit to determine a value, which indicates a temperature of the breathing gas mixture, wherein the electromagnetic device is configured in combination with the control and analysis unit to allow a magnetic field to act cyclically on the thermocouples or on the thermopiles, wherein the thermoelectric device is configured in combination with the control and analysis unit to carry out a determination of a thermal conductivity of the breathing gas and to determine a value that indicates situations of the thermal conductivity as a function of or without effect of the magnetic field on the quantities of breathing gas mixture fed by the gas transport module, wherein the infrared optical device is configured in combination with the control and analysis unit to carry out a measurement of an absorption of infrared radiation in the breathing gas mixture and to determine a value, which indicates situations of IR absorption in the breathing gas mixture;
• a memory configured to store properties of different gases or gas mixtures, the memory being connected to the control and analysis unit, wherein at least one data set of data, which indicates properties of different gases, gas mixtures or vapors, is stored in the memory,
• wherein at least one of the properties from the group of properties comprising:
• thermal conductivity;
• pressure dependence of the thermal conductivity;
• and temperature dependence of the thermal conductivity, is stored in the at least one data set at least for moisture contents in the breathing gas mixture and contents of the gases nitrogen, oxygen, carbon dioxide in the breathing gas mixture,
• wherein the control and analysis unit is configured to identify, based on the determined values, which indicate a moisture content or a water content in the breathing gas mixture, a temperature of the breathing gas mixture, a pressure level of the breathing gas mixture, situations of the thermal conductivity in the breathing gas mixture and situations of the IR absorption in the breathing gas mixture, and based on the properties of different gases, gas mixtures or vapors, which properties are stored in the memory, a special state in the breathing gas supply of the airplane pilot, in which special state there is at least one quantity of an additional gas component different from carbon dioxide, nitrogen, water vapor, moisture or oxygen present in the breathing gas mixture, and
• wherein the control and analysis unit is configured to provide an output signal which indicates the special state that at least one quantity of an additional gas component different from carbon dioxide, nitrogen, water vapor, moisture and oxygen is present in the breathing gas mixture.