In order to take full advantage of the performance and features of environmental sensors, e.g. humidity and temperature sensors, mechanical design rules need to be considered. Unbeneficial housing and PCB designs may cause unexpected temperature and humidity deviations and could increase the response time. Simply following four basic rules makes the integration easy and straightforward.
From our experience, we recommend to take the mechanical integration of the sensors into account in a project as early as possible. The later the housing is designed, the more the complexity of integration will increase.
Most importantly, the sensor has to be exposed to the ambient environment as much as possible and large openings in the housing should be used. This guarantees a fast system response and the influence of the housing can be minimized.
Furthermore, the sensor enclosure should be isolated from the other parts of the device. This will reduce offsets of the integrated system.
Our third advice is that the volume around the sensor, so called dead volume, must be minimized. This step will result in a decreased response time.