Bob
I think Type S would be good for your range. Type S works well for
months. I never understood why MFMP used type K. I offered them an
oz. of Pl/Rh alloy some while ago, that they could trade for type S
thermocouples, but they never took me up on it.
AA
On 3/27/2017 5:22 PM, Bob Higgins wrote:
Presently I am using k-type thermocouples outside of their comfortable
range to 1200C. Bob Cook was suggesting the Nb-Ir thermocouples in
place of k-type. MFMP has used before a b-type thermocouple, but it
was quite expensive. I would love to find an inexpensive (but
controlled) s-type or b-type thermocouple because they would be easy
to integrate into my system. If the Nb-Ir thermocouple were readily
available at low cost and had a reasonable S/N I would welcome that
too. When you buy from Omega, they have controls to insure the alloys
are in spec. so as to control the voltage vs. temp to a standard. I
would like the same assurance for alternative thermocouple types too.
I also need lead wires to the junction of about 40".
On Mon, Mar 27, 2017 at 1:09 PM, a.ashfield <a.ashfi...@verizon.net
<mailto:a.ashfi...@verizon.net>> wrote:
Bob,
What do you want the thermocouples for? ie what temperature?
I have never used Niobium - Iridium thermocouples in the glass
industry. We always used type S, and type B for more stable
results over years duration, for things like furnace crowns at
1550C, but this had the disadvantage of smaller output. The
platinum migrates to the Rh leg over time, but we found a minimum
wire diameter was also necessary for long life due to
crystallization of Pl.
AA
On 3/27/2017 2:30 PM, Bob Higgins wrote:
Regarding the Nb-Ir thermocouples ... Bob, can you suggest a
source for these thermocouples and their voltage calibration
data? For my experiments, the cost of the hardware is coming out
of my own pocket - not someone else's deep pocket. For k-type
thermocouples, the voltage-temperature profile is built into my
DAQ. For the Nb-Ir, I suspect, I will have to read the voltage
and convert it to temperature with a custom LUT in Labview. All
doable if the voltage is not too low to be noisy and if the
couples are not too expensive.
On Mon, Mar 27, 2017 at 11:43 AM, <bobcook39...@gmail.com
<mailto:bobcook39...@gmail.com>> wrote:
Jones—
You note regarding the Lugano test and Higgins assessment the
following:
“The systemic optical false assumptions have rendered any
further conclusion unscientific. Levi was reportedly paid an
enormous amount of money by Elforsk and yet made stupid
errors, notably failing to use high temp thermocouples for
verification - plus he also failed to calibrate near the
running temperature - unforgivable, since his errors have
poisoned the positive aspects.”
I recently made the same comment about using good high
temperature T/C’s to Higgins with respect to his own Ni-H
automated test at MFMP. I suggested he use a Nb-Ir couple
for high temperature measurements of the outside of his glow
stick-like experiment. The couple is good for more than 2000
C I believe.
With a high temperature LENR heat source the Niobium/Iridium
combo is a reasonable thermo-electric source of power as
well, and it could well replace Pu-238 as a reliable,
long-term power supply for remote locations or space
applications without the hazard associated with Pu-238.
Bob Cook
