Understanding Temperature Sensor Technology: RTDs, Thermocouples, and Thermistors

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Understanding Temperature Sensor Technology: RTDs, Thermocouples, and Thermistors

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Күн бұрын

▶ Engineer's best friend for learning: realpars.com
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▶ You can read the full post here:
realpars.com/temperature-sens...
⌚Timestamps:
00:00 - Intro
00:19 - RTDs
01:31 - RTDs in industrial applications
02:15 - Thermocouples
03:48 - Thermocouples in action
05:26 - Thermistors
06:15 - Thermistor applications
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Today, we'll take you on a journey through the exciting world of temperature sensor technology, specifically RTDs, thermocouples, and thermistors.
1) RTDs or Resistance Temperature Detectors: An RTD is a little device that measures temperature by looking at how much electricity can flow through a wire.
Imagine a wire made of platinum, which is a special kind of metal. As the wire heats up, the metal atoms start to vibrate more and get in the way of the flow of electricity.
An RTD takes advantage of this fact by measuring the wire's resistance to electricity and using that to figure out the temperature.
RTDs are super accurate, too - they can measure temperature with an accuracy of 0.1% or better!
One typical industrial application of RTDs is to measure temperature in food processing plants.
2) Thermocouples: They're pretty cool because they work based on something called the Seebeck effect.
Imagine you have a piece of copper wire and a piece of iron wire, and you stick them together.
When you heat up one end of the wires, a little bit of electricity is created! This happens because the difference in temperature between the hot end and the cold end creates a flow of electricity.
This flow of electricity is called an electromotive force. Thermocouples measure this EMF and use it to figure out the temperature difference between the hot and cold ends of the wires.
Thermocouples come in all different shapes and sizes, and each type is made with different combinations of metals.
One common type is called Type K, and it's made with a wire of nickel and chromium. Another type is called Type J, and it's made with a wire of iron and constantan.
Thermocouples can measure temperature over a really wide range, from really cold temperatures like negative 200 degrees Celsius all the way up to super hot temperatures like 2000 degrees Celsius!
Imagine you're working in a factory where they make things like ceramics, bricks, or glass. By using a thermocouple to monitor the temperature inside a furnace or kiln, the workers can make sure that the temperature stays within a certain range.
Boilers also need to be monitored to make sure they don't get too hot and cause damage. Thermocouples are also used in science labs to measure the temperature of things like chemicals or materials.
3) Thermistors: These are sensors that can measure temperature based on how their resistance changes when the temperature changes.
There are two main types of thermistors - NTC and PTC.
- NTC stands for negative temperature coefficient, which means that as the temperature goes up, the resistance of the thermistor goes down.
- PTC, on the other hand, stands for positive temperature coefficient, so as the temperature goes up, the resistance of the thermistor goes up too. It's like they're playing different games altogether!
One common use of thermistors is in HVAC systems. Inside the air conditioning system, there's a little thermistor that measures the temperature of the air that's coming out of the vents.
If the temperature is too warm, the thermistor sends a signal to the air conditioner to tell it to kick into high gear and start cooling the air down more quickly.
Thermistors are also used in medical thermometers to measure body temperature, and in automotive engines to monitor the temperature of the engine and make sure it doesn't overheat.
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Пікірлер: 62

@aymane9489 Жыл бұрын

We appreciate your work RealPars, you're doing a very good job. Thank you.

@realpars Жыл бұрын

Thank you very much! We appreciate your support.

@tobievanblerk-zd4pu Жыл бұрын

Love RealPars training videos .. keep it going

@realpars Жыл бұрын

Glad you like them!

@asemtantawy5779 Жыл бұрын

Training videos are super excellent and clear, thanks for your great effort ❤

@realpars Жыл бұрын

You're very welcome! Happy learning

@deankay4434 Жыл бұрын

The reaction chart used for the NTC thermistor is somewhat confusing because it's backwards. Temp should be the vertical and resistance be the horizontal. Since the temp is unknown, the arrow of activity should start in the middle space, drop to the left lower corner. Either is correct with the attempt to keep both charts the same, but shown different, like the 1,100 page electronics book in front of me. They are used in gas tanks for low fuel LED's. Inside a metal can, hanging off by itself and the fuel keeps it cold. Remember, a resistor in series with an LED's behind the dash. So current is off until fuel gets low. The resistor limits current to the NTC thermistor so when un-covered, it gets warmer and allow 0.030 mili-amps to reach the bulb, turning it on. It is used on imports, motorcycles and a larger number of domestics. The can provides ground so path to ground is thru fuse, resistor, bulb, thermistor to ground. Easily added if desired. ASE Master tech since 78, retired.

@pmbari1 Жыл бұрын

Very nice video! Educative as always!

@realpars Жыл бұрын

Glad you enjoyed it!

@Blades-fm6ck Жыл бұрын

As ever, very clear explanations. Thank you

@realpars Жыл бұрын

You are welcome!

@syufrijal Жыл бұрын

Amazing explanation of temperature sensor technology ..very educative

@realpars Жыл бұрын

Glad to hear that! Thank you very much

@samyartaraporevala8785 2 ай бұрын

like always short and great. thanks

@realpars 2 ай бұрын

Our pleasure!

@Carbonconsultant 4 ай бұрын

very detailed explanation. thanks for simplifying things for beginners like me.

@realpars 4 ай бұрын

You're very welcome!

@sanojvgeorge Жыл бұрын

Thanks 😊😊

@abdulrahman.h.r2756 Жыл бұрын

Thanks

@NoahTaylor98 Жыл бұрын

wonderful design,you are a professional designer.

@realpars Жыл бұрын

Thank you very much!

@devivaraprasadpulagam9411 Жыл бұрын

Excellent demonstration

@realpars Жыл бұрын

Thank you!

@abhisheksinghasia Жыл бұрын

Very Informative Video !

@realpars Жыл бұрын

Glad to hear that! Thank you for sharing.

@jaidoshi7284 7 ай бұрын

Excellent Explanation..!! helped me a lot..!!

@realpars 7 ай бұрын

Glad to hear that! Happy learning

@krushnalmahajan417 3 ай бұрын

Great work

@realpars 3 ай бұрын

Thank you!

@lalamsivaprasad7122 Жыл бұрын

Nice video man It is very helpful tomy education...

@realpars Жыл бұрын

Glad to hear that, Lalam! Happy learning.

@nguyentuan-ev1zx Жыл бұрын

Thank you !

@realpars Жыл бұрын

You're welcome!

@adrabie733 Жыл бұрын

Thank you ❤

@realpars Жыл бұрын

You're very welcome!

@IngDzib Жыл бұрын

Hi, good lesson 😊

@realpars Жыл бұрын

Glad you liked it!

@petrutarabuta5617 11 ай бұрын

Thanks!

@realpars 11 ай бұрын

You're very welcome!

@janezhang-ZonGon Жыл бұрын

thanks for you video,dear friend,so RTD and thermocouple all could be used in food processing machinery,what is their different?RTD is good for food processing or thermocouple better?Thanks

@realpars Жыл бұрын

Thanks for your comment, Jane! I will happily go ahead and share this with our course developers. Hopefully they can add this to the list for future video courses.

@user-xz5nm6ev9k 3 ай бұрын

nice video

@realpars 3 ай бұрын

Thank you!

@EricPham-gr8pg Ай бұрын

Can L.E.D. Light and infrared sensor and U.V. All work together to get correct temperature and verify it too. But foods polution would make everything meaning less

@haidarmohamedsami3867 Жыл бұрын

Hi there, thank you for the great videos and explantations ..... I didn't found your app on Iphone Appstore, can you guid me plz?

@realpars Жыл бұрын

Hi there, We have recently optimized our learning platform which includes some highly requested features. We are happy to bring you these new improvements which will grant an even better learning experience, as a result we had to decide to no longer support the RealPars App. You can use our webpage to continue watching the video courses www.realpars.com Hope this helps, and happy learning!

@sudhanshunayaksk Жыл бұрын

Dear sir make a video regarding BBD /sfm sensor & it's working principle .....,

@realpars Жыл бұрын

Thanks for sharing your topic suggestion, I will happily go ahead and add this to the list.

@abmamun3231 Жыл бұрын

Hello I wanna learn s7 and TIA Portal.

@genantamtam9364 Жыл бұрын

Hello, Where does PT100 /1000 comes in the picture here? If not? In that case why? I thought pt100 are pretty common?

@realpars Жыл бұрын

Hi there, Thank you for your question! We have more than one video on KZfaq about this subject. I suggest you look at the other ones we have to help answer your question. Our Pro membership will give you access to more information and a certificate after you complete the lessons. kzfaq.info/get/bejne/bd6VpcyitbfdmIU.html Hope this helps, and happy learning!

@genantamtam9364 Жыл бұрын

@realpars thanks for the answer but it didn't answer my question. My question is where does PT100 comes in the picture? I have learned that there are 3 different types of temperature measures, RTD, T/C and thermistors which are mostly located in motors. How about PT100? Is that a 4th solution or?

@geragarcia9542 Жыл бұрын

2:42 min. How much is "a small amount of electricity?"

@realpars Жыл бұрын

Hi there, Thank you for your question! Well, your question applies only to the Thermocouple. Thermocouple is an active device, meaning it produces a small amount of millivolts (mV). The RTD and the Thermistors are passive devices, meaning they have to be hookup to an electronic device that supplies the power. Regarding “a small amount of electricity,” it depends on the type of Thermocouple used and manufacture. To help you understand, here is some information and a link for your review: Ideally, the reading should range between 12 mV to 15 mV. If the thermocouple outputs voltage below 12 mV, there is a significant drop, meaning that it is defective and needs to be replaced. And again, depending on the type of Thermocouple used. instrumentationtools.com/how-to-calculate-thermocouple-temperature-by-measuring-the-output-millivoltage/

@geragarcia9542 Жыл бұрын

@@realpars thank you very much. I won't be the only one learning from your answer.

@EricPham-gr8pg Ай бұрын

Can L.E.D. And in

@JaySmith91 Жыл бұрын

Great video! Subscribed. As a bit of constructive criticism, the technical content was good, although the analogies could do with some work. I'm not sure if they were trying to be funny, but the tone of the video makes it sound like it's just chatGPT garbage: For example: "That's like trying to shoot a basketball from really far away and getting it in almost every time" and "Up to 2000 degrees Celsius; that's even hotter than the hottest day in Death Valley". Analogies could be really powerful when done right.

@qtprot Жыл бұрын

Agreed. The analogies were very off, UNLIKE AN RTD

@Stomachbuzz Жыл бұрын

I was going to comment the same thing. The language in this video was very off compared to other RealPars videos.

@JaySmith91 Жыл бұрын

@@Stomachbuzz I'm not certain the audio's not AI enhanced text-to-speech. I'm now convinced the script was AI generated. Weird that it wasn't reviewed to fix this. Concerned that much of the popular online content will become AI driven content farms.

@scottodonnell7121 Жыл бұрын

Also, the vocabulary needs to improve. Electricity is a form of energy, and energy can neither be created or destroyed. It merely converts from one form to the other.