Gas detection device and gas detection process, which generate a warning and an alarm

A gas detection device for detecting a target gas or detecting target gases, the gas detection device comprising:

• a sensor unit;
• and
• a signal-processing evaluation unit,
• wherein the sensor unit is configured to repeatedly measure an indicator of a concentration of the target gas or of at least one of the target gases in a respective gas sample and to generate at least one target gas signal using measured values,
• wherein the target gas signal comprises a temporal sequence of target gas signal values,
• wherein each target gas signal value refers to a sampling time and comprises the target gas concentration at this sampling time,
• wherein the evaluation unit is configured to compare a target gas signal value with a predefined smaller target gas threshold and a predefined larger target gas threshold, if the target gas signal value is between the predefined smaller target gas threshold and the predefined larger target gas threshold, to cause at least one target gas warning to be issued in a form that can be perceived by a human being, and if the target gas signal value is greater than the larger target gas threshold, to cause at least one target gas alarm to be issued in a form that can be perceived by a human being,
• wherein the evaluation unit is configured to generate an aggregation signal using the target gas signal,
• wherein a signal value of the aggregation signal refers to a reference time which is assigned to a sampling time and includes an aggregated value for the target gas concentration,
• wherein the aggregated value is an averaging or accumulation of target gas concentrations at the sampling times of an aggregation time period,
• wherein the aggregation time period ends at the reference time to which the aggregated value refers to,
• wherein a duration and/or a start of the aggregation time period are specified, and
• wherein the evaluation unit is configured to compare an aggregated value with a predefined smaller aggregation threshold and a predefined larger aggregation threshold, if the aggregated value is between the two aggregation thresholds, to cause at least one aggregation warning to be issued in a form that can be perceived by a human being, and if the aggregated value is greater than the larger aggregation threshold, to cause at least one aggregation alarm to be issued in a form that can be perceived by a human being.