How it Works
In principle the measuring method is based on the reaction of gaseous water and a reagent, which is calcium hydride.
The sample material is weighed and placed into a sample tray. The sample tray itself is part of an integrated reactor within the HydroTracer. A heater warms the sample – temperatures between 50 °C and 210 °C are freely selectable. The water evaporating from the sample reacts with the reagent in a cooled area and water is transformed into hydrogen. Other volatile substances will condense at the cooled surfaces within the vessel. The concentration of hydrogen gas is measured. It is a measure for the amount of water in the reactor.
The concentration of hydrogen is a measure of the sample humidity. The percentage of water of the sample is calculated by division with the sample weight.
1. The sample material is heated in the sample tray, water evaporates.
2. The hot humid gas ascends.
3. The reagent exchanges water by hydrogen.
4. The H2-Sensor detects the concentration of hydrogen.
5. The cooled, dried gas descends and can absorb water again.
This unique procedure is what makes it a water-selective measuring method.