The Testo 650 is used for measuring *humidity*, Jed, for, like, food
manufacturing and storage, etc.
Read that HP literature. The device measures up to 100% humidity, it
claims. Wet steam is above 100% humidity. The literature claims that
the device measures: CO2, CO, temperature, and relative humidity.
Other parameters are calculated from these measurements.
I don't see anything there about determining steam quality or the
amount of liquid water mixed with steam. It will only measure, on the
face of it, the percentage of water vapor in air. It also gives a
working range of up to 85% relative humidity "without condensation."
I.e., no liquid water!
The brochure for the HP device says it will calculate enthalpy, but
this is basically, as I read it, the heat carrying capacity of air. I
don't see any hint that this thing could measure steam quality. As I
wrote, someone please 'splain this thing to me!
At 05:37 PM 6/20/2011, Jed Rothwell wrote:
Ah yes. It is right there in the <http://testo.com>testo.com
brochure, isn't it?
I vaguely recall that I checked this months ago for the instrument
used in the first test: the Delta Ohm model HD37AB1347 IAQ with a
high temperature HP474AC SICRAM sensor. I listed that in the news
item with a link to the brochure here:
<http://www.deltaohm.com/ver2010/uk/st_airQ.php?str=HD37AB1347>http://www.deltaohm.com/ver2010/uk/st_airQ.php?str=HD37AB1347
The first thing that brochure says is that it measures lots of stuff
simultaneously including "enthalpy." That's what we're looking for!
Right? Without knowing as much as this helpful person Leguillon, I
figured that would be enough, and I dropped the subject. I should
have recalled that's what the brochure says and mentioned it here earlier.
To avoid confusion let me just reiterate: in the first test they
used the Delta Ohm, and during E&K's test they used a Testo 650.
Different instruments.
My guess is that all of these instruments are designed to measure
enthalpy. Why else would people pay all that money for them? What
else would someone measuring steam quality want to know?
- Jed
