Both very large and very small water contents of steam can be determined with precision by means of the two-stage process.
For the direct determination of high water contents of x=0.5 and below the separating calorimeter is used. High vapour contents between approx. x=0.95 and x=1.0 can be determined indirectly using the throttling calorimeter. The vapour is adiabatically expanded and transferred to superheated steam. The low and high water contents can then be determined with the aid of the h-s diagram.
Steam up to max. 10bar and 240°C can be investigated.
Learning Objectives / Experiments
- separating calorimeter for high water content (vapour content x<0,5) - throttling calorimeter for high vapour content
* Determining the water contents of a liquid-vapour
mixture: calorimeter suitable for ET 830, ET 833,
 determination of low and high water contents in 2 phase liquid-water mixture  separating calorimeter for vapour content x<0.5 with water-cooled recooler  throttling calorimeter for vapour content x>0.95 with water-cooled condenser  process schematic with functional schemes