The GALLTEC+MELA humidity measuring sensors of the GC / KC / ZC.D and ZC.HD series have a robust aluminum housing, with inox or aluminum sensor part, and can successfully measure temperature an humidity of air and similar gases, up to 200 °C. The D and HD executions can be used for pressures up to 25 bar, and temperatures up to 160 °C. These sensors are a common choice for different industrial applications such as drying processes. They are highly durable, can operate in polluted environments, with humidity over 95% RH, with very low air speeds. However, these sensors should not be used for environments with high air speeds and high particle concentration.