Dew Point Measurement

Today, modern production processes cannot be imagined without compressed air as a versatile and reliable energy source. Depending on the respective single case different demands are made on compressed air. Meeting a certain moisture degree or dew point / pressure dew point is the basis for a permanent failure-free plants operation.

Depending on the application different demands are made on the compressed air. For each process the observance of a certain moisture content is the condition for a durably failure-free functioning of the whole system. Most of the compressed air lines are made from steel or non zinc-coated steel. Since the corrosion speed stronlgy increases from a relative humidity of 50 % this value should be exceeded in no case. In the course of time, high moisture will lead to a corrosion in case of non zinc-coated lines. The rust gradually chips off and moves to the sampling points. This leads e. g. to blocked nozzles, defective control elements and production stops. Expensive repairs and short maintenance intervals are inevitable. In addition to problems with corrosion and the described results the moisture content has direct influence on the quality of the final products. Which problems may arise in case of too high moisture? In the following please find some of the most occuring samples...

• Hygroscopic products (spices, sugar and so on) agglutinate during transportation through the pneumatic conveying system
• Bubbles occur during varnishing and coating processes
• Drilled holes may get blocked due to dust which is carried along
• In winter control valves freeze in unheated halls