That meter that was listed can measure Relative Humidity but it can not measure the quality of the steam. As you know, relative humidity just means how saturated the air is for for the given temperature - it says absolutely nothing about the quality (dryness or "wetness") of the steam. The quality of the steam (a.k.a. dryness on Vortex) gives you the ratio of the mass of vapor to the total mass of water (liquid and vapor) in a given sample.
It takes complicated expensive instruments to measure the quality of steam (one device is called a "throttling calorimeter"). A common or even expensive Relative Humidity instrument can not do it. If Rossi used an ultrasonic fogger in boiling water, he could get micron sized droplets at 100 C. That's close enough to 101 C with errors due to calibration. They should insulate the black hose and stick it in a barrel of water. 12 kW of steam that is fed into 50 gallons of water (or some number of gallons) will raise the temperature at rate that could be easily measurable. If it can be done, find out exactly what information rules out "wet" steam. Here is a photo of an ultrasonic fogger using water to produce what looks like steam, but is in fact micron sized water droplets: http://www.buzzle.com/articles/ultrasonic-fogger-how-does-it-work.html Here is a link to a description of a "throttling calorimeter" which is a device that measures the quality ("wetness") of steam. Basically the throttling calorimeter involves letting the pressurized steam expand into a cavity and measuring the temperature of the resulting gas. It only works with pressurized steam such as 30 psia steam or higher so that it can expand down to 15 psia or atmospheric pressure. http://www.plantservices.com/articles/2003/378.html?page=full On Mon, Jan 17, 2011 at 8:38 PM, Jed Rothwell <[email protected]> wrote: > Jeff Driscoll <[email protected]> wrote: > >> >> How can you use an indoor air quality meter (listed in Jed's email) to >> measure the dryness of the steam? (you can't) >> > > Apparently you can. The person who did this is reportedly an expert in > steam. I gather this meter measures RH in steam as well as air. > > > >> Can it be faked the following way: >> >> Use an ultrasonic fogger operating at 1.6 MHz to create micron size >> droplets. Heat the droplets to 90 C and then send it down the black hose. >> > > The temperature of the steam out the outlet is measured with a > thermocouple. It is 101 deg C. So it is definitely steam, or a mixture of > steam and water. The RH meter ensures that is all dry steam. > > - Jed > >
