Am 23.10.2011 13:15, schrieb Higgins Bob-CBH003:
It would be worth a verification experiment. Absent that, I believe
that measurement errors from the two thermocouples "touching" the
electrically conductive heat exchanger in two different places and
possibly with two different metals will be lost in the noise for a
meter designed for more than one couple (as was used).
I have now read some instruction manuals and datasheets of Testo devices.
The noninsolated type is offered for measurements in gas and is the
cheapest type.
For other measurements they have other specialized sensors encapsulated,
with magnets, or specially for measuring at hoses, with special ribbons.
Of course yes, the noninsulated type can be used, if the user has some
understanding, and makes some careful adaption but it is not specified
for this.
In any case this all wouldnt need discussion if there where a
calibration made with a known energy source, or if the thermal range and
termoelement placement would have been made so obvious ( at some cm
distance) that doubts are almost impossible.
