Thermistor for measuring/controlling temperature

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All about thermistors for measuring and controlling temperature, including how to use the thermistor that's in an automobile coolant temperature sensor. I talk about the difference between Positive Temperature Coefficient (PTC) thermistors and Negative Temperature Coefficient (NTC) thermistors. I talk briefly about my experiment to test if cold water boils faster than hot water and then talk about the effect of the thermistor's
changing resistance on the electrical current running through a PC fan, to turn the fan on and off. I go over the electrical circuit for it in detail, incuding the homemade power supply, thermistor, PC fan and wiring.
This video has correct English captions. Click on the CC button at the bottom of the video to see them.
To watch "Does Cold or Hot Water Boil Faster?", see here:
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16 июл 2024

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Комментарии : 247

@GREENPOWERSCIENCE 11 лет назад

excellent work Steve!

@RimstarOrg 10 лет назад

Thanks. Another video's in the works. It's just taking a little longer than usual and I don't want to just rush one out.

@RimstarOrg 11 лет назад

Thanks. I'll have a look in a PC power supply for one too. I'm glad it brought you some fun!

@RimstarOrg 11 лет назад

Thanks. Yes, it's a 3 amp, 240 VAC variac which I bought brand new from a local store many years ago.

@dhananjay4525 2 года назад

Seriously underrated channel

@GREENPOWERSCIENCE 11 лет назад

Your videos are getting scary AWESOME!! Added to feed and FB.

@RimstarOrg 11 лет назад

Thanks again Dan! I've done likewise with your recent solar key making video. I love how it's something so practical.

@ntcthermitors508 3 года назад

Dear, This is kristy wong from Nanjing Shiheng Electronic,Co,Ltd. We are the manufacture of NTC thermistors, NTC temperature sensors, Varistors. Thermistors and thermistor probes are used extensively throughout the HVAC/R,BMS,PCBA industry. Do you need these. NTC thermistor series application includes of surge current, temperature compensation, precision temperature test Looking forward to working with your company Whatsapp/Wechat/Tel:+86 13951639167 Email: 1372286431@qq.com kristywong521@gmail.com www.ntcshiheng.com/

@RimstarOrg 11 лет назад

Hmmm... Now you've got me wondering what's inside those. I'll have to find one and see. I'm glad you enjoyed the video! Thanks!

@1942nn 3 года назад

I want to learn about thermistor today and this video explains it all. THANK YOU.

@Endisupertramp 9 лет назад

Hey Rimstar, great video. A very clear and practical demonstration that makesit alot easier to understand the use of thermistors. Thanks. :)

@ntcthermitors508 3 года назад

@MuhdFitriNazri 7 лет назад

this is actually really helpful for my a level. i could easily understand thermistor in less than 5 minutes.

@ntcthermitors508 3 года назад

@jessebrace 2 года назад

Great explanation! So clear and concise, Thank you!

@hdagist 10 лет назад

Very informative, great video. Best explanation I have seen on youtube about thermistors.

@ntcthermitors508 3 года назад

@jeevakumarmasilamani6539 3 года назад

Super cool. Content is clearly understood even after 7 years and am sure that my statement will hold good after another 7 years too.!!!

@RimstarOrg 11 лет назад

Thanks Dan!

@tomakukoc9661 10 лет назад

Awesome. Detailed but simple to understand.

@ntcthermitors508 3 года назад

@user-be4yc2vr5c 6 лет назад

Comrade thank you, I can't believe I couldn't find anything online when I typed in "thermal protection resistors" or "thermistor" even only came back with typical temp. measuring therms, not resistance regulating ones. PTC and NTC.. That's what I was missing I'm guessing.. Lol. Thanks again for the help, got yourself a like/subscrip!

@ntcthermitors508 3 года назад

@unosec 8 лет назад

thank you for the video production, very informative.

@raygregory6089 4 года назад

Outstanding job on the video. Very easy to understand.

@ntcthermitors508 3 года назад

@joshdat3reak 2 года назад

Thank you for your video! I have an off road buggy and the fan isn't switching on to cool the engine. It looks like it's the same type of thermistor so I'm going to check the resistance now and see if its working!

@RimstarOrg 11 лет назад

This week's video is an electronics one all about using thermistors, what they are and how use them to measure and control temperature. I especially had fun doing the simple circuit where I heat up the thermistor with a hair dryer until that causes the fan to turn on. And then the fan cools off the thermistor, causing the fan to turn off!

@ntcthermitors508 3 года назад

@RimstarOrg 11 лет назад

Good point. Though I don't know how much mine can handle since I couldn't find any specs on it at all.

@ThomasBurns Год назад

Thanks for this video! Any pointers on how to read a thermistor's label? Does "8L10 10002" mean it acts like a 10K resistor at room temperature?

@rybread5718 6 месяцев назад

wow, this is a high quality video. I wouldn't think it would be 10 years old.

@mansourtabaie2573 3 года назад

Very clear and concise explanation. Well done.

@ntcthermitors508 3 года назад

@vemlacduong1954 7 лет назад

Thank you , Your instruction ,lab encourage me to learn .

@bojanab4961 6 лет назад

Such an awesome video! Helped a lot! :D Thank youuu

@sundaystone4256 9 лет назад

Wow that`s amazing. I have learned a full topic in just 4.50minutes. Thanks. :)

@oreidjm 10 лет назад

Very good video, please post more

@sanjaysamant7031 4 года назад

Very precise and apt explanation

@RimstarOrg 11 лет назад

I just opened up with only PC power supply I have (outside of a computer) and it has SCK 054, an NTC thermistor. I don't want leave this power supply intact though in case I ever need it as such. At least I now know where to find them. Thanks!

@TheQuestion0mark 11 лет назад

Love your videos!

@shaikhzaheerabbas7087 7 лет назад

very good way of explaning

@RimstarOrg 11 лет назад

I don't think it's a rectangular hyperbola since it looks like when it's near freezing the graph isn't parallel to that axis. I don't know what the fact that it's a curve means. Maybe it's something to do with the molecules or the bonds between them, but looking online I couldn't find any insight. And thanks! Glad you're still enjoying the videos.

@denishnatiuk921 Год назад

excellent understandable tutorial

@RimstarOrg 11 лет назад

Sounds like you should try it! And upload a video when you do! :)

@pro-films9920 4 года назад

You explained very well brother:))

@ntcthermitors508 3 года назад

@nickbadsha8275 4 года назад

Thanks for making this nice video

@kennymangal2124 9 лет назад

really good video and nice presentation

@ntcthermitors508 3 года назад

@ricardoalbertogonzalezrami725 7 лет назад

Very good video

@petarandjelkovic1530 2 года назад

That was god damn amazing video, thanks so much, helped with Faculty assignment!

@Batman-ft9nk 8 лет назад

thank you for the help

@on_Machs 7 лет назад

great video.

@katherinelelito6387 8 лет назад

Thanks! This was really clear.

@ntcthermitors508 3 года назад

@botin818 5 лет назад

very good theory

@neil_digital 5 лет назад

Interesting video.

@neilmac991 2 года назад

Very thorough

@fenre6801 6 лет назад

Wow this really helped ur great man.I couldn't have done my hw otherwise

@ntcthermitors508 3 года назад

@juanalvares11 5 лет назад

VERY WELL EXPLAINED

@RimstarOrg 11 лет назад

This sensor is for attaching to the cooling system in a particular model of car, so you'd have to make your own mounting system. To turn on a fan below 100C you can do what I did in the video. But it probably won't turn on at 100C. For that you'd need to add a resistor so that the total resistance adds up to something that would result in the right current for the fan. You also have to consider what temperature the fan should turn off at. Search google for "pexsupply snap disc" for a better way.

@RimstarOrg 11 лет назад

According to the graph, cold water won't boil sooner than room temp water. Cold water will have a faster heat transfer rate while it is still cold, but once the cold water reaches room temp, the heat transfer rate will be the rate it should be for room temp water. So once the cold water reaches room temp it will take the same time from then on as room temp water does.

@wayne2fun 8 лет назад

really cool brain thanks man I do like your videos a lot

@ntcthermitors508 3 года назад

@iamses2 4 года назад

great video. thank you.

@ntcthermitors508 3 года назад

@Impakzy 2 года назад

Nice job

@satishkumar-gg5fm 4 года назад

Smart work... more video please using 555 ic to control fan

@venkatesansundaram6760 4 года назад

Soooperb explanation 👌👌👌

@TheLordsxdad 11 лет назад

Thanke you what did the sensor fit and how could I use it to turn a fan on when the temperature drops to 100 celcius

@Slider2732 11 лет назад

That was fun :) Just grabbed what I thought to be one off an old PC power supply and had a little look. Green disc 'SCK 2R55A'. Thought may as well try it. Only 2.7ohms at 80F room temp. Held in hand it went to 2.5ohms, in front of a small fan, up to 3.3 ohms. At 10x those figures it would be similar to your automotive one...did a search and it is one, but nothing like as variable as that one you show. Still, I now know something more about them, cheers.

@ntcthermitors508 3 года назад

@bigfatshit8186 4 года назад

This is a lifesaver

@RimstarOrg 11 лет назад

The only way I know to do that is create moving positive ions. It'd be atoms that are ions with positive protons and neutral neutrons in the nucleus and negative electrons surrounding the nucleus but there would be less electrons than protons, and so they'd be positively charged. In fact, I've done it in my "How to Make/Build a Lifter or Ionocraft" video. The positive wire electrode strips electrons from atoms in the air to create positive ions, which flow down to the negatively charged foil.

@areebabdullah5001 6 лет назад

I want to connect NTC thermistor to 12 CPU fan(0.40 A) for temperature 38°C or above which value (ohm) will I should use??

@cityandsuburb 5 лет назад

Thanks sparkie....!!

@Ryodox 11 лет назад

Is there a way to directly measure the temperature of the thermistor to know how much heat/resistance it requires to allow current to the fan?

@DerLeeker 11 лет назад

Great explanations... and was this red thing ,which you switched on, a variac?

@RimstarOrg 11 лет назад

An IR gun, one of those handheld infrared guns that you point at things and then the temperature is shown on a digital display would work.

@mazharshah7274 4 года назад

defferent btween moter and dynamic effect . send me vidios ok

@mazharshah7274 4 года назад

defferent btween moter and dynamic effect . send me vidios ok

@kevin00861 2 года назад

Thanks a lot 🙏

@twistedframes5462 6 лет назад

Superb sir

@RimstarOrg 11 лет назад

It isn't a capacitor symbol, though I can see the resemblance. It's supposed to be like two walls facing each other. When they're close together they restrict the flow of electrons i.e. high resistance. When they're farther apart they allow more flow i.e. low resistance. Oh well.

@rizwan3147 7 лет назад

very nice

@gehadyasser1001 6 лет назад

Totally awesomeeee thx a lot👌👌

@NK-wf1bu 7 лет назад

thanks, it was very helpful☺👌

@ntcthermitors508 3 года назад

@ishansandaruwan9902 7 лет назад

Very good .......

@yousefza5551 9 лет назад

very helpful cool video :)) thanks a lot

@ntcthermitors508 3 года назад

@siyabongamdlalose2804 10 лет назад

wow!Thank u sir!

@monamasoumi8592 9 лет назад

thanks easy understanding

@phaniraja9104 4 года назад

which sensors are used in mobile phones for temperature detection ??

@Slider2732 11 лет назад

Found a great one just now. Take a look for small green bulb type devices attached to back of large heatsinks. Got one from another PC power supply, it was 7.3K at rest in approx 80F. Blew on it for 30 seconds and it went to over 8K, warmed it between fingers and it went down to 6.5K. Can only imagine fridge and sun values...pretty good temp sensor for free, once calibrated. Perhaps to keep an unpowered eye on transistors or other circuits, or part of indoors/outdoors actual temp sensor :)

@ntcthermitors508 3 года назад

@Hi-ny6iq 4 года назад

Thank you so much❤️

@ntcthermitors508 3 года назад

@abubardewa939 9 лет назад

God bless u....

@guillermovela4681 5 лет назад

in a real life scenario, aprox. how fast will let's say a NTC 5d-20 change from initial resistance to final resistance with 2A as final current in a current limiter configuration? Seconds, milliseconds? Minutes?

@TheLordsxdad 11 лет назад

Thank you

@Vichardhara303 9 лет назад

Can we arrange this thermistor in series with AC current

@RimstarOrg 9 лет назад

Santosh Kulkarni I don't see why not. It's just a component whose resistance changes with temperature. en.wikipedia.org/wiki/Thermistor talks about its use for current limiting.

@LordTheodore04 Год назад

very cool

@kaveniknezhad1043 5 лет назад

You're a pro

@faraitaonezvi606 7 лет назад

very useful

@bhongzaragosa1186 8 лет назад

thanks sir!!!!

@nilasithu5274 6 лет назад

Awesome

@muhamadsirojudin998 7 лет назад

thanks 😊

@GlobalAwareness2525 10 лет назад

My Whirlpool gas dryer isn't getting hot enough and the clothes never get dry, the gas flame works, it's just shutting the heat off too soon, so I bought what is called a thermistor in a sealed plastic case that screws onto the exiting chamber after the blower. This did not solve the problem. When I remove the thermistor as to not allow it to sense any warm temperature and left it plugged in the flame stays on endlessly. At first I assumed that even though the encased thermistor was new in the package that it might be defective straight from the manufacturer, but now that I see this video there are a few of these disc-like thermistors attached inside the dryers wiring harness, they are not seemingly positioned in any specific spot as if to sense temperature, but just part of the wiring, I always thought these were perhaps some sort of resistor, but instead they are identical to what you call a thermistor. When I was at a dead end on what to do next then this video helped me to decide that the next thing I should try is to replace the short harness sections that contain these thermistors. Thanks for making this video.

@iadt5047 8 лет назад

hey, the idea is just awesome...but upto wat temperature does this system works or upto wat temperature will it sense the temp/.....

@RimstarOrg 8 лет назад

+iADT I don't know. There's no data on the box that it came in and I wasn't able to find a datasheet for it online when I looked before. Maybe you'll have better luck. It's a BWD part and the part numbers on the box are 020-7913-8 and WT691. It's normally used for car engine systems somewhere. But if you have a non-automotive thermistor, one that isn't in the brass casing like mine, then you can probably look up some numbers online.

@mkamrananwar6740 5 лет назад

as fan rotate only in one direction as usual ,but if we want to rotate it in one direction as a the temperature increases and rotates in opposite direction when the temperature decrease or vice versa .which equipment should we use tomake its our project can anyone help me in this matter please!!!!!

@firoxlion 11 лет назад

Interesting, but why did you use a capacitor symbol for the NTC?

@DerLeeker 11 лет назад

ah good very usefull everytime ;)

@michaelbauers8800 3 года назад

Who downvoted this. It was super informative IMO. I was curious about how resistance can decrease with increase temp. Normally I thought it increased.

@jv1zz 9 лет назад

Does anyone know where i can get a temp sensor that turns on fan at 95 degrees no matter wat

@cuttingedge346 7 лет назад

thank u

@gadirajurambaburaju9790 3 года назад

Nice 👍

@44DEADguy 9 лет назад

THX LIAM NEESON!!

@RimstarOrg 9 лет назад

ahmad taika LOL!

@tehcno007 11 лет назад

the temperature vs resistance graph...is it a rectangular hyperbola??is there any considerable relationship or formula that you can draw from your observations??and oh!, i forgot you are awesome.