Abstract
The invention provides a gas sensing device with replaceable sensor element carrier, which is adjacent to a gas flow path and includes: several sensor element carriers and a circuit board. Each sensor element carrier has at least one sensor element and a judgment unit on one side, and a circuit layout on the other side, and the sensor element is electrically connected to the judgment unit by the circuit layout; wherein, one of a plurality of sensor element carriers is adjacent to the gas flow path and senses the gas by the sensor element. The circuit board is at a distance from the sensor element carrier, and is connected to one of the sensor element carriers by a plurality of assemblies, and has a signal connection unit and a plurality of power supply and signal processing units, the power supply and signal processing units are respectively connected to the signal connection unit in electrical communication; wherein, the judgment unit is coupled to the signal connection unit, so that the signal connection unit judges the sensor element used for sensing the gas, and activates the corresponding power supply and signal processing unit to judge the sensed gas to generate a gas data.