Dear all, *this is my guess. I hope it’s correct, but thank you very much in advance for correction if necessary.*
-The stated probe only measures relative umidity. If liquid phase is present, then R.U. is always 100%. what follows only applies for vapour-air mixture - knowing the temperature and R.U., data logger can calculate the vapour fraction of the mixture, also known as X=gr(vapour)/kg(dryair). It's just a calculation and no measurement is required. If no dry air is present, such calculation is *sensless*. -Back to saturated steam: in presence of liquid phase this kind of probe only give us 100% UR. (if not broken down because of too much vapour density and *no air*!). In order to measure the liquid fraction of a saturated steam, (Mliquid/M liquid+gas) this probe is *completely useless.* An "academic" way to carry out the measurement of the liquid fraction of a saturated steam, is based on superheating by isohentalping expansion through a valve. Perhaps there are transducer for this purpose. For sure not the one we are talkin 'bout. *Psychrometry is where we have about 30g of water as gas and 1kg of dry air. This is the field of such probes. Saturated steam is not the same. *I'm very confused. Sorry for my poor english. Best Regards. EE
