How Thermocouples Work - basic working principle + RTD
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Date: 2023-11-17
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Comments and reviews: 23
Anah
I have some questions. Can someone please help me?
1) Is the hot junction where you put whatever object or substance you want to measure the temperature of?
2) If the reading on the multimeter is in volts how can someone get a value in Celsius, Fahrenheit or Kelvin from it? Why are voltmeters used for thermocouples if they measure in volts?
3) What makes thermocouples so sensitive to fast temperature changes?
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I have some questions. Can someone please help me?
1) Is the hot junction where you put whatever object or substance you want to measure the temperature of?
2) If the reading on the multimeter is in volts how can someone get a value in Celsius, Fahrenheit or Kelvin from it? Why are voltmeters used for thermocouples if they measure in volts?
3) What makes thermocouples so sensitive to fast temperature changes?
reply
coachgeo
Massive thank you for this video. On these extended wire thermocouple temp sensors such as shown at beginning of video (0. 47 seconds for example) is just the end of the thing where the different wire types exist; making up a sensor portion, and the rest of the wires that transmit the different voltages back to the device being likely the same metal. aka typical wire for that level voltage transmission?
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Massive thank you for this video. On these extended wire thermocouple temp sensors such as shown at beginning of video (0. 47 seconds for example) is just the end of the thing where the different wire types exist; making up a sensor portion, and the rest of the wires that transmit the different voltages back to the device being likely the same metal. aka typical wire for that level voltage transmission?
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nixon2tube
Your videos have been more explanatory than both my trade school and Devry when I was a young man. I'm 50 now, and feel a bit embarrassed to finally learn things like regulators and capacitors long after I should have, but appreciate these videos. I have sent you some small change to buy that cup of coffee.
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Your videos have been more explanatory than both my trade school and Devry when I was a young man. I'm 50 now, and feel a bit embarrassed to finally learn things like regulators and capacitors long after I should have, but appreciate these videos. I have sent you some small change to buy that cup of coffee.
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Advanced
You have invented your own physics. The correct one called Thermoelectric effect and it does NOT work as you explaned 1: 50 - 2: 20.
Thermoelectric effect, will work even if the entire lenght of the wire is same temperature.
It does not have to have differance in temperature at all.
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You have invented your own physics. The correct one called Thermoelectric effect and it does NOT work as you explaned 1: 50 - 2: 20.
Thermoelectric effect, will work even if the entire lenght of the wire is same temperature.
It does not have to have differance in temperature at all.
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Birkan
There are some thermocouples are used in commercial kitchens. Completely copper pipe and inside has ONLY copper wire covered with fiberglass fabric. At the end of that thermocouple also does not have two different cable. Only a M8x1 thread end which has a basic welding at bottom.
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There are some thermocouples are used in commercial kitchens. Completely copper pipe and inside has ONLY copper wire covered with fiberglass fabric. At the end of that thermocouple also does not have two different cable. Only a M8x1 thread end which has a basic welding at bottom.
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Edss
Very interesting. I've been an avionics technician for about 5 years working with electrical components on Pratt & Whitney engines. They had an EGT harness that had chromel-alumel theromcouples to measure Exhaust Gas Temp. Always wondered how it worked. Thanks for the video.
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Very interesting. I've been an avionics technician for about 5 years working with electrical components on Pratt & Whitney engines. They had an EGT harness that had chromel-alumel theromcouples to measure Exhaust Gas Temp. Always wondered how it worked. Thanks for the video.
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ytubeleo
At 07: 45, it is rather confusing that the big title onscreen is How thermocouples work but you are actually describing how an RTD works. I thought you were describing some new method of using a thermocouple where you force current through it and measure the voltage.
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At 07: 45, it is rather confusing that the big title onscreen is How thermocouples work but you are actually describing how an RTD works. I thought you were describing some new method of using a thermocouple where you force current through it and measure the voltage.
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Chris
thanks for this video, very clear. Though Im not clear with TC vs RTD: are they used together or one instead of the other? My understanding is that one can use either TC or RTD, but at 6: 00, it looks like the RTD is linked to the TC. Am I misunderstanding something?
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thanks for this video, very clear. Though Im not clear with TC vs RTD: are they used together or one instead of the other? My understanding is that one can use either TC or RTD, but at 6: 00, it looks like the RTD is linked to the TC. Am I misunderstanding something?
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Justin
If the metals in a thermocouple are linked together at the tip why don't electrons just travel through the conductor and balance out the potential difference like any other wire? Or is the effect of the temperature gradient strong enough to overcome that current?
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If the metals in a thermocouple are linked together at the tip why don't electrons just travel through the conductor and balance out the potential difference like any other wire? Or is the effect of the temperature gradient strong enough to overcome that current?
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Gib
So in other words, the basic working principle of a Thermocouple is that when two dissimilar metals are joined, and the two junctions are put at a different temperature, there will be a current flow?
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So in other words, the basic working principle of a Thermocouple is that when two dissimilar metals are joined, and the two junctions are put at a different temperature, there will be a current flow?
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CHUCK
The Earth is the largest Thermocouples, 3, 6, 9? You can, design, Thermocouples gasoline automotive engine block, and bypass the alternator, imagine that, where are you Henry Ford?
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The Earth is the largest Thermocouples, 3, 6, 9? You can, design, Thermocouples gasoline automotive engine block, and bypass the alternator, imagine that, where are you Henry Ford?
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Chris
Hi there, do you have any videos/ recommended links to describing Flame Rectification in an easy to understand way? Best whatever the case
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Hi there, do you have any videos/ recommended links to describing Flame Rectification in an easy to understand way? Best whatever the case
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Some
I cringed at the twisted soldered tc end. thats a no no. because the temp is read at the first junction, and not at the soldered end.
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I cringed at the twisted soldered tc end. thats a no no. because the temp is read at the first junction, and not at the soldered end.
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education
noooooo bro the 3 cog art man, o noh, not the 3 cog
they wont spin if conected like this, that not the engineering mindset
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noooooo bro the 3 cog art man, o noh, not the 3 cog
they wont spin if conected like this, that not the engineering mindset
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Ahmed
Is it paradox that when you heated a wire it the electrons moved more freely at 2: 52
And then at 7: 32 you say the opposite.
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Is it paradox that when you heated a wire it the electrons moved more freely at 2: 52
And then at 7: 32 you say the opposite.
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Henry
I'm an Instrumentation Technician since 1997, been working with TC's and RTD's since then. This is a very accurate explanation!
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I'm an Instrumentation Technician since 1997, been working with TC's and RTD's since then. This is a very accurate explanation!
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Jalex
So why not just heat one of the metals instead of both? That way theres a voltage at one end and it flows towards the other one
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So why not just heat one of the metals instead of both? That way theres a voltage at one end and it flows towards the other one
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Jc
Marvelous. I had all I needed to know, thank you, a very clear explanation. will buy Paul a coffee, thank you again.
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Marvelous. I had all I needed to know, thank you, a very clear explanation. will buy Paul a coffee, thank you again.
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Jarrod
5: 59 i didnt understand the cold connections part and offsetting the error. please explain in a diffferent way.
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5: 59 i didnt understand the cold connections part and offsetting the error. please explain in a diffferent way.
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Dr
There is nothing more real than what cannot be seen and there is nothing more certain than what cannot be heard
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There is nothing more real than what cannot be seen and there is nothing more certain than what cannot be heard
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for
can i ask the one you use in your video can i use it in a boiling water to measure it, please reply thank you
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can i ask the one you use in your video can i use it in a boiling water to measure it, please reply thank you
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marvin
Is the solder bead at the end of the wire made of special material or will 50/50 work with no distortion
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Is the solder bead at the end of the wire made of special material or will 50/50 work with no distortion
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Tim
Curious. Can thermopile be used in place of a thermocouple in a wall heater controled by a thermostat.
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Curious. Can thermopile be used in place of a thermocouple in a wall heater controled by a thermostat.
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