Materials which take in and retain or release water are described as hygroscopic materials. Hygroscopic materials always try to form a moisture equilibrium with the surrounding air. This principle is used to measure the moisture in material by measuring moisture equilibrium.
Ideally, moisture equilibrium is measured in a bore hole in the material. To keep the bore hole as small as possible, a thin .16 in. humidity probe is used. It should be protected from dirt by a Teflon cap during measurement. The bore hole is then simply sealed using sealing clay.
Based on the moisture equilibrium measured, testo 635 automatically shows material moisture in % in the display. Material moisture calculation is available for the following materials:
– Concrete
– High-insulation bricks
– Solid bricks
– Hard wood
– Soft wood
– Gas concrete
– Particle board
– Calcium sulphate floating screed
– Cement floating screed
– Lime sand brick
Materials are easy to select from the menu. Using the "Material" user profile, the material can be accessed directly at the touch at a button.
Additional material characteristics can be stored in testo 635-2 using ComSoft.