To maintain a ‘comfort zone’ or specific climate conditions within an office building, it is necessary to control not only the temperature but also the humidity levels. Air handling units are often installed for such applications.
The humidity level plays an important role in the ‘felt temperature’ or ‘heat index’ – the temperature feels colder when humidity is lower and vice versa, explains Rotronic.
Humidity levels below 30%rh are common during the heating period, but these can result in itchy and cracked skin, irritated eyes, and drying of the shield of mucus in airways that protect against bacteria, viruses and pollutants. High humidity levels, however, affect the amount of allergens and can cause dust mite populations and mould colonies to grow. Furthermore, dry air can cause wooden furniture to crack and paper to stick in printers; while moist air can cause mildew.
To carry out humidity measurements, Rotronic offers a range of instruments. One example is the HygroMer IN-1, a thick-film capacitive sensor with long term stability. This is suitable, explains the company, for HVAC applications where probes don’t usually get calibrated frequently.
Also available are humidity and temperature probes, transmitters, and handheld instruments. All solutions are designed for high levels of accuracy, with precise humidity measurement enabling ventilation units to work at their maximum performance. Of further benefit, there are a wide range of communication interfaces available, and the instruments offer long-term stability.