Air collecting device for a dust measuring system

An air collecting device (1) for a dust measuring system, the air collecting device (1) comprising:

• a housing (2) defining a first chamber (21) and a second chamber (22);
• an air inlet structure (3) opening into the first chamber (21) and configured for providing an incoming air stream from an outside environment into the first chamber (21);
• an air outlet structure (4) configured for expelling air from the air collecting device;
• an adapter structure (5), the adapter structure (5) configured for being connected with a dust sensor assembly, wherein the adapter structure (5) comprises a fluidic connection to the first chamber (21) and a fluidic connection to the second chamber (22);
• a connecting portion (23) establishing a fluidic connection between the first chamber (21) and the second chamber (22);
• wherein the first chamber (21) and the second chamber (22) are partially separated by a separator wall (24), wherein the air outlet structure (4) is a channel structure extending from an opening (41) in the separator wall (24) to the outside environment;
• and wherein
• the first chamber (21) and/or the air inlet structure (3) are configured such that the incoming air stream is guided at least partially towards the adapter structure (5) and wherein the second chamber (22) is configured such that an air stream entering the second chamber (22) from the adapter structure (5) passes the second chamber (22) and is then guided into the first chamber (21) via the connecting portion (23).