How Thermocouples Work - basic working principle + RTD

[@EngineeringMindset]

⚠️ *This video took a long time to make* if you would like to buy Paul a coffee to say thanks, link below: ☕ PayPal: www.paypal.me/TheEngineerinMindset Channel membership: kzbin.info/door/k0fGHsCEzGig-rSzkfCjMwjoin Patreon: www.patreon.com/theengineeringmindset

[@deepayanmukherjee2610]

You are very good teacher...good explanation 👌

[@sheikhfaizullah8217]

Yes ... Very very very Good teacher 👍👍👍👍👍

[@LG5main]

4:53 the boiling waters bubble is different equations

[@DonaldSleightholme]

anyone tried making a thermocouple from copper but adding a resistor to one of the wires? more electrons might build up on the side without resistance and generate a voltage 🤔🤷‍♂️

[@Graham_Wideman]

4:43 "Different temperature gradient" is incorrect and not part of the thermocouple principle. The point of the two different materials is that they have different magnitudes of Seebeck effect, and when applied to two wires that experience the SAME temperature difference (from probe end to terminals end), the difference in voltage can be interpreted as a temperature.

[@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.

[@EngineeringMindset]

Very much appreciated, thank you. Also very glad to hear it's been helping you.

[@henryrollins9177]

I'm an Instrumentation Technician since 1997, been working with TC's and RTD's since then...😀😀 This is a very accurate explanation..!

[@manishplayz6687]

I m studying instrumentation right now I wanna ask u this field has scope or not and this field offers u high paying job?

[@jsbaltimore3405]

Thanks!

[@EngineeringMindset]

Thank you

[@jc_hz4196]

Marvelous. I had all I needed to know, thank you, a very clear explanation. will buy Paul a coffee, thank you again.

[@ruxxy_j5667]

Thank you so much for the explanation. I'm currently self learning physics and I'm learning about heat. I couldn't actually understand the part about thermocouples and thermo electric thermometers. This video made me understand the process crystal clear. God Bless

[@andyrechenberg]

Always wondered how thermocouples worked. Thanks 🙏🏼🤗

[@EngineeringMindset]

You’re welcome 😊

[@xxgoodboy1499]

Thanks for all the information throughout all the videos! Your explanations are very digestible, even for young people.

[@EngineeringMindset]

Glad to hear!

[@xxgoodboy1499]

@@EngineeringMindset man, that was quick. Now that's community management!

[@punknoodles0]

DUDE!!!! You just answered one of my biggest questions at work ever, of all time!!! Thank you, so much!!

[@Edss-nr6xw]

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.

[@archerdev]

Science bless you sir. Awesome, thanks for sharing this. 🤘

[@kevin00861]

You literally save me ! Thanks a million times my amazing lecturer

[@jericosha2842]

wow this was expertly explained!

[@borysnijinski331]

No it was not.

[@ryanweber7826]

Great videos! They are helpful in my electrical classes.

[@renedionne3976]

This is to the point! The animations are excellent! Thank you so much!

[@tedlahm5740]

Paul: Excellent explanation of thermocouples. One of the three (3) ways we have to generate electricity. Thank you.

[@tonythomas951]

I can think of 5 ways off hand to produce electricity and if my memory is correct theres actually 7. Piazo, chemical reaction, Solar, Heat and magnetic. Ill grab a book and be back. I should know this off the top of my head but I'm old.

[@tonythomas951]

I'm back. Friction (static), Chemical (batteries), Pressure (piezo electric effect), Heat (thermocouple), Solar (photovoltaic), Magnetism (generator). So theres six ways according to electricity one- seven which is a very common electrical theory text book.

[@EngineeringMindset]

Seen our new video on HOW SOLAR PANELS WORK in detail kzbin.info/www/bejne/j6nXaGWXec95nbs

[@sheikhfaizullah8217]

All doubts clear Awesome explain 👍👍👍👍

[@EngineeringMindset]

Glad to hear that

[@vaseemmehrancp9372]

One of the best demonstration on Thermocouples

[@Heliarc91]

My favorite electrical channel. You have a real voice. And are accurate :)

[@gus473]

👍🏼 Excellent explanation! Yet I was hoping it would go on to the point at which it triggers the furnace! 🔥🤔

[@janahájková-h5c]

love your videos sooo much, thank you for your work, it is greatly appreciated!!

[@bigcasso9428]

Some of the best videos , my TAFE teacher showed my this KZbin channel and I’ve been watching since👍👍👍

[@luigiminieri2372]

That’s the best explanation I found . Thank you !

[@harshitbhat715]

Just wow ! Thank you 😊❤️

[@benoit721]

Very good explanations ! I'm impressed, love this channel

[@ec4tbo]

Great video. Efficient learning 😊

[@florentinosanchez3969]

This is the best video ever

[@cezariusus7595]

This is a great youtube channel.

[@sudalaimuthu5628]

Thanks for clear explantion. It will help.fir students

[@aliabd-alhalim4695]

Graet video paul...thanks👍

[@EngineeringMindset]

Glad you enjoyed it

[@grecolonsvila]

2:20 "This vibration is so small you can't feel it with your hands" LMAO

[@MrMraza123]

Very well explained

[@EngineeringMindset]

Glad it was helpful!

[@akkinojohnsoncaribbeanac1980]

Great explanation 👍

[@EngineeringMindset]

Glad it was helpful!

[@mikejason3822]

Thanks for the clear video.

[@ZheHongGuo]

Very clear explanation, thanks for your video.

[@superchino117]

simple and concise explanation. tx you.

[@bhuvanacl8341]

Your videos are amazingly extraordinary

[@EngineeringMindset]

Thank you so much 😀

[@vasu.marripudi]

Nice explanation... 👌

[@shubhamupman7260]

Wow great explanation with great examples as usual. Thanks for the vid!!

[@juancarlosgalvan6031]

Excelent explanation👍👍👍

[@memorie411]

Thanks for all the information....

[@jeetclassesforboardsneetii4451]

Best explanation Loved it !

[@sharfazhameed6382]

I love all his videos all 100%

[@محمدمحمد-خ5ع2ص]

Thanks so much for your video

[@finaruliviu7701]

Excellent explanation ! 👏

[@AliAhmadi-hq9pj]

Great video ❤️

[@Quran.And.Science]

Amazing!👍👍

[@rajvanshsingh2018]

Liked before even watching

[@ivangroffils]

This is soooo usefull (exam) 🙃

[@ujwalghatbandhe4894]

Thank you sir. Nice Explain

[@eugeneleroux1842]

Thank you for a very clear explanation.

[@Tjaldprd]

an AC flow is not actually moving electrons (well, there´s a little net movement, like honey, thats undesirable, as it leads to material damage), but its the "electron density" that is propagating through the wires... that´s why 'eletricity' moves at speed c, otherwise electrons, by having mass, cannot do such thing... an analogy can be a football stadium wave (sort of.. it´s an analogy). Great work, btw! subscribed :)

[@sohailjanjua123]

Hi, I like your lecture. Thanks

[@pouryaahmadi615]

thanks for the good explaining

[@khomo12]

Thank you!👍👍👍

[@Chris-sx6kc]

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 ?

[@oldeharbinger]

The link is one way. Thermocouples measure mV changes across 2 different types of wire. But the device the TC is connected to needs a reference point, which is the space temp of the device. That is when an RTD is used to assist the TC. Because an RTD uses resistance to measure temps across a known temp curve, it reads the temp at the device, does some math and the conversion to degC or degF happens. With an RTD as a standalone measuring tool, you only need the temp/resistance curve. The difference is the accuracy and range. TCs have a MUCH wider range of measurement than an RTD. Hope this helps.

[@ubahfly5409]

@@oldeharbinger Yeah that confused me as well. The idea that a temperature gauge (TC) needs a... temperature gauge (RTD) to be able to... gauge the temperature seemed redundant in the extreme. But am I correct to understand that this comparative difference in effective range that you mentioned accounts for why an RTD couldn't just be used by itself in applications such as a home furnace which requires a thermocouple ?

[@Crunch104]

Thermocouples also used by NASA for space missions like the Voyage craft to generate electricity to operate the craft and instruments. Radioisotope Thermoelectric Generators. Still going in the Voyager craft 46 years later with radioactive Plutonium generating heat. Just found this out. Fascinating!

[@sakibthakor897]

Amazing video bro ❤️

[@EngineeringMindset]

Thanks 🔥

[@slyfer5321]

Awesome channel

[@EngineeringMindset]

Thank you

[@DrSAUD-gp1re]

There is nothing more real than what cannot be seen and there is nothing more certain than what cannot be heard

[@trueflamexp7297]

Great video. Thanks.

[@ketanmorajker]

_JUST AMAZING EXPLAINATION_

[@rajvanshsingh2018]

Always good content

[@xxgoodboy1499]

Quite.

[@rashwanmohamed4545]

this is amazing thanks!

[@yaswanthamuluru6190]

Great explanation , you didn't mentioned the actual principle (seaback effect), Make video on how floroscent light works

[@thelz7909]

I think you meant "Seebeck" effect.

[@borysnijinski331]

Fluorescent lights...mercury vapour is excited by electric current flowing through tube. When mercury atom returns to unexcited state it emits UV light. UV light interacts with phosphorescent coating on inside of tube producing visible light. FYI fluorescent lights also emit a small amount of UV.

[@Graham_Wideman]

Not only did he omit mention of the Seebeck effect, but the video claims that the measurement voltage results from different temperature gradient, which is false. It results from the two materials different magnitude of Seebeck effect, applied to the exact SAME temperature difference in the two wires. (The actual gradient itself doesn't matter, it's the total temperature drop, and must match in the two wires if sense is to be made of the resulting differential voltage.)

[@oblivionx14x94]

Cool video. I would like you to do the furnace sequence of operation video.

[@diffranticlen8996]

Perfect!

[@msg1956]

Excellent..!

[@PrakashPrakash-sn3do]

Hey bro Thanks 😃😃😃

[@EngineeringMindset]

Welcome 😊

[@rivbir786]

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.

[@rivbir786]

If anyone knows, please also explain us that how that thermocouple working with only copper wire?

[@desmondhow343]

Another good video 👍

[@EngineeringMindset]

Glad you enjoyed it

[@SevenDeMagnus]

New subscriber here.

[@VigneshVicky-hm7kc]

Thankyou for your effort, kindly make an video about how the Thermocouple works when connected to a Measuring device. I've some basic doubts, video mentioned that RTD is taken as reference like Ice. Kindly make me clear about these

[@SevenDeMagnus]

Thank you.

[@Universal1able]

If thermocouples use a RTD to measure temperature, why not just use the RTD in the first place?

[@Reptilia12]

Thermocouples are cheaper, less fragile and replaceable, and are able measure higher temperatures

[@davevandersmit4896]

[A Nice Guy] I think it’s because, for highly accurate readings you still need to get a separate reference temperature to correct for the errors. Platinum is very expensive; you would need much longer run for the “main probe” thus don’t want to use platinum for that. IOW, it’s a compromise.

[@thelz7909]

You can use either to measure temperature. Thermocouples respond faster but RTDs are more precise and usually more accurate. Having said that, thermocouples are available in more types and can be designed to withstand more harsh environments. They are both quite common in industrial process applications.

[@arnabpersonal6729]

We can use RTDs for low temperature applications instead of thermocouples

[@spotifyloverpk]

Rtd accuracy is good for low range like room temp. but Thermocouple is very good for high range temperature measurement

[@mikefasan325]

Well done.

[@KA-kl2ws]

Great video

[@EngineeringMindset]

Glad you enjoyed it

[@viswanathancr2801]

good video

[@LG5main]

um paul i want ask something how does a welding machine works?

[@henryrollins9177]

Controlled short circuit.

[@benoit721]

Hi, there are many ways to assemblate 2 different metal pieces. 2 most common ones are : -using torch (so flames) to make the pieces turn very hot and easy to assemblate, it's called solder or braze. -On the other side you have welding, which uses low voltage (so it don't kills you if you touch) but very high intensity (short circuit). It is only possible because of low electrical resistance of metals. :)

[@LG5main]

@@benoit721 thanks

[@carliemorgan1871]

@@benoit721 high amps = high heat

[@elainekent6821]

Understanding Thermocouples and Different Types

[@EuropeanSoyboy]

So does this system work without any external energy? I mean both the thermocouple and RTD

[@chiewthintzee3210]

Mabye you can make a video of electronic symbol and just a brief overview of them

[@anoop22march]

Thank you sir , Can you please tell me ,in this IGBT ,in which pin I connect input output supply semikron make SKM100GB12F4

[@anoop22march]

Sir Do make video on IGBT ,MOSFET , used in VFD, welding machine, its connection and testing

[@EngineeringMindset]

See my new MOSFET explained video here➡️: kzbin.info/www/bejne/d6i1e6awmsRso5Y

[@BhupeshRajShakya]

Can u make video on How does inject printer works??

[@harshitbhat715]

S please

[@EddyMSH]

Thank you very much, it's obliging !

[@Jarrod_C]

@5:59 i didnt understand the cold connections part and offsetting the error....please explain in a diffferent way.....

[@eazyrat]

any more stuff relevant to gas would be great, thanks

[@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?

[@chrisroberts8745]

Hi there, do you have any videos/ recommended links to describing Flame Rectification in an easy to understand way? Best whatever the case

[@jimadams7765]

So how is the junction of the thermocouple secured? Is it welded or soldered? Or just mechanically twisted together? Is it even electrically connected at all?

[@EngineeringMindset]

Yeah just soldered. There is a close up in the video to show it also btw

[@jimadams7765]

1:40 @@EngineeringMindset I wonder what happens when the temperature being measured is higher than the melting point of the solder? ... I've just checked Wikipedia and that says "spot welding" or "crimping" if it's above 450 deg C. It also (very) briefly discusses special insulation of the wires. Thanks Paul. Very interesting vid.

[@spotifyloverpk]

@@jimadams7765 yeah spot welding kiya jaata hai..

[@borysnijinski331]

Brazed...regular solder would melt at top end of range.

[@carliemorgan1871]

@@EngineeringMindset actually welded. Solder adds a different metal to the mix.

[@alissosonvasq]

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?

[@EngineeringMindset]

Check our new Multimeter tutorial out ➡️ kzbin.info/www/bejne/ap2kqq2IrdiVesU

[@rahulbhatia3481]

Thank you

[@SloppyProductionsNZ]

How does the electrons continue to feed a voltage? Does it jump from the flame onto the metals?

[@HeliMicky]

Nice video, you didn't mention A or B class RTD's makes a big difference when you need to measure temperature accurately :-)

[@EngineeringMindset]

Yes, true

[@IngDzib]

Thanks !!

[@jassleentips1139]

Great

[@mohammedrukunuzzaman8133]

thanks

[@scottsc63edwards86]

Everything made sense until it came to taking one wire and cooling it to zero degrees. Why would this matter if the thermocouple was made from two different types of metals? The two different metals will give accurate voltage readings at given temperatures, why not simply take the voltage readings at whatever the ambient temperature is.

[@Reptilia12]

The voltage is proportional to the temperature gradient from the “hot” end to the “cold” end. You need to measure or control the temperature at the cold end.

[@scottsc63edwards86]

Reptilia12 if that’s the case then thermocouples would be impossible to be used in industrial applications.

[@Reptilia12]

@@scottsc63edwards86 but of course they are used widely in industry. It is relatively cheap and easy to use an integrated thermistor sensor at the circuit board to measure the temperature at the “cold” end and perform “Automatic cold junction compensation” (ACJC). Unfortunately most thermistors have a max operating temperature not much higher than 100 deg C, are not suited to harsh environments, and those that can go higher can be too expensive for industrial application.

[@scottsc63edwards86]

Reptilia12 What am saying is if we need to cool one wire to absolute zero to get an accurate reading like mentioned in the video, I don’t see any practical applications. Read my first post, why not simply measure the voltage at a given ambient temperature to get an accurate voltage reading.

[@carliemorgan1871]

@@scottsc63edwards86 this is done inside a thermometer, not on a thermocouple. Thermocouple is kitterally just two dissimilar metals joined at one end. That is it.

[@jhusk574]

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?