On Wed, Jun 22, 2011 at 1:58 PM, Jed Rothwell <[email protected]> wrote:
> Jeff Driscoll wrote: > >> no it doesn't give the mass of water as vapor because it only works >> for measuring the mass of water of vapor in AIR. >> NOT in a mixture of vapor and microscopic water DROPLETS >> > > All air has microscopic water droplets in it. It's a question of degree. An RH measurement in the plume of an ultrasonic mister would probably not be accurate either. But the more important point is that the gas is pure water vapor. The probe is designed to measure water content in air. That's how it's calibrated. Even if this device measures, in any context, the mass of water vapor in a gas, as G. claims, then it will simply return the density of the steam. How can that be used to determine enthalpy? But of course, it doesn't measure mass directly, even in air. It measures how wet the dielectric gets. That can be used to determine RH if it is suitably calibrated. I don't see how it can be used to determine the liquid content in steam. And the manufacturer makes no claim that it can.
