i knew i wasn't crazy for trying this! i had a very long K-type thermocouple that had a heavy bullet shaped weight at the end. it was for measuring temp about 3 feet below the surface of a lake. the bullet weight had corroded off completely, and i was left with essentially a K-type that had the end cut off. i realized that i should be able to clip the ends clean and solder them together with a big blob and repair the thermocouple to mostly work. but it didn't work! and everyone thought i was a moron for trying. thinking back, it's likely that the old thermocouple reader it was attached to was messed up somehow, or i messed up the calibration it had baked in when i made my repair. i didn't change the overall length of the thermocouple by more than 0.5% maybe, so who knows
The twisted hot side will get later of oxidation/carbon and stop working. I usually twist it tight and strike it flat with a hammer which just about acts like a weld because the force combines the metal tips. Keep the flat end of the screw driver over the junction before putting the hammer. Direct hammer contact destroys the thermocouple wires.
slightly off topic.... but maybe you can help I have an MPPT lead or lithium solar charge controller intended to be mounted right next to battery. A fairly inexpensive unit typically used for solar powered street lamps. The controller has small tail of wire with an in the air thermocouple on the end to measure temperature for controlling charge based on temperature of space around battery. The wire with sheath is only 2 or so MM in size and the thermoucouple secion itself only maybe half cm in width... I would like to move this thermocouple (thus allow for battery to be far away) with about 25 feet of compensating extension wire .. do you have any suggestions for me?. I have no idea on how to determine if the thermocouple itself is J or K orrrr??
@@PeteVree False Pete, two conductor wires are dissimilar and must be to ensure the Seebeck effect takes place. K wires are Chromel (+) and Alumel (-). The difference in Milivolts (EMF) is what determines your measured temperature. Coming from an engineer at a Thermocouple company in the midwest.
@@KilledByTornado You are correct. I read the question as... are the extension wires the same composition as the actual thermocouple. Thanks for clearing that up for us.
I'll be honest, the lab following this is definitely not sexy. I found it informative, but my students are going to hate it tomorrow. I'll post the lab where we interface a Type K thermocouple to the Arduino soon... it's pretty good.
i knew i wasn't crazy for trying this! i had a very long K-type thermocouple that had a heavy bullet shaped weight at the end. it was for measuring temp about 3 feet below the surface of a lake. the bullet weight had corroded off completely, and i was left with essentially a K-type that had the end cut off. i realized that i should be able to clip the ends clean and solder them together with a big blob and repair the thermocouple to mostly work. but it didn't work! and everyone thought i was a moron for trying. thinking back, it's likely that the old thermocouple reader it was attached to was messed up somehow, or i messed up the calibration it had baked in when i made my repair. i didn't change the overall length of the thermocouple by more than 0.5% maybe, so who knows
Most likely the solder.
The twisted hot side will get later of oxidation/carbon and stop working. I usually twist it tight and strike it flat with a hammer which just about acts like a weld because the force combines the metal tips. Keep the flat end of the screw driver over the junction before putting the hammer. Direct hammer contact destroys the thermocouple wires.
Thankyou so much for the tutorial! I've been looking everywhere for this
So all I need is a yellow wire and a red wire. That's fucking brilliant.
Science, Brah.
slightly off topic.... but maybe you can help
I have an MPPT lead or lithium solar charge controller intended to be mounted right next to battery. A fairly inexpensive unit typically used for solar powered street lamps. The controller has small tail of wire with an in the air thermocouple on the end to measure temperature for controlling charge based on temperature of space around battery. The wire with sheath is only 2 or so MM in size and the thermoucouple secion itself only maybe half cm in width... I would like to move this thermocouple (thus allow for battery to be far away) with about 25 feet of compensating extension wire .. do you have any suggestions for me?. I have no idea on how to determine if the thermocouple itself is J or K orrrr??
Most any to different metal wires work. We use to use nicrom and cooper. Nichrome will not solder. Just melt the to metals as a weld.
hi pete from east canada. great presentation again! Do you know of a source of larger thermocouples / thermopiles?
No, sorry.
WE soulder the twisted wire together at the vary tip.
In this extension wire are the two wires are of different metals? Or same material
same material, otherwise you would have a galvanic reaction between the dissimilar metals
@@PeteVree False Pete, two conductor wires are dissimilar and must be to ensure the Seebeck effect takes place. K wires are Chromel (+) and Alumel (-). The difference in Milivolts (EMF) is what determines your measured temperature. Coming from an engineer at a Thermocouple company in the midwest.
@@KilledByTornado You are correct. I read the question as... are the extension wires the same composition as the actual thermocouple. Thanks for clearing that up for us.
Waiting for the lab test. Need to see the rise or fall in ohmic value/degree c
I'll be honest, the lab following this is definitely not sexy. I found it informative, but my students are going to hate it tomorrow. I'll post the lab where we interface a Type K thermocouple to the Arduino soon... it's pretty good.
Sudah lama saya menunggu updet video2 dari mr pete
😊
Sedang mengerjakannya, sangat sibuk mengikuti pelajaran saya.
@@PeteVree sukses selalu mr pete,
Sangat membantu jika video video ditambahkan subtitle bahasa indonesia
👍👍