Pollution Protected Sensor Units

Abstract

A device for monitoring a characteristic of an airflow, especially in an HVAC system, includes: an inlet port for receiving a partial airflow (PAF) of the airflow to be monitored (AF); a particle separator arranged downstream the inlet port and configured for separating particles (P) having a particle size and/or particle weight above of a given threshold out of the partial airflow; a measurement cell located downstream the particle separator and including a fluid flow channel with a channel inlet and channel outlet for guiding the partial air flow (PAF) from the channel inlet through the measurement cell to the channel outlet; a sensor unit configured for measuring at least one characteristic of the partial airflow (PAF) when passing through the fluid flow channel; and an outlet port for discharging the partial airflow after having passed the measurement cell.

Dependencies are inferred from the claim text.