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> 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> 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 >> > >
