Aliexpress Thermistor?

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Tincho85
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Aliexpress Thermistor?

Postby Tincho85 » Tue Dec 15, 2015 9:51 pm

Hello all, I need a little help please.
What do you think of this thermistor? LINK

SPECS FROM SELLER:
Spoiler:
Temperature Coefficient: B=4200
Brand Name: JLNT
Rated Power: ≤25mw
Technology: Cermet
Type: Thermal Resistor
Condition: New
Operating Temperature: -45°C~300°C
Color: Gold
Resistance Tolerance: 1%
Package Type: Throught Hole
Resistance: 100K Ohm
Model Number: MF51B104F4200FA

Features
1. MF51B series in the form of radial glass encapsulated form.
2. Good stability, high reliability.
3. Wide resistance range 2~5000KΩ
4. High precision resistance and B value.
5. Glass encapsulated, can operate in high temperature and moisture environment.
6. Small dimension, solid, convenient for automatic installation.
7. Operating temperature range -45 ~ +300°C
8. Fast heat induction, high sensitivity.

He claims that it can read up to 300ºc but the only datasheet that I could find says it can't.
MF51-B.pdf
(201.51 KiB) Downloaded 40 times

Is the seller lying? or I have the wrong datasheet?


Essentially I'm looking for a generic thermistor with leads >55mm and that can read more than 270ºc, but I don't want to spend $2 or more per thermistor.
I need to buy 500 of them.

Any links, ideas, suggestions?
Martín S.

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teoman
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Re: Aliexpress Thermistor?

Postby teoman » Wed Dec 16, 2015 2:10 am

Sometimes they can write the stuff in chinese units.
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Re: Aliexpress Thermistor?

Postby geneb » Wed Dec 16, 2015 8:37 am

There's no such thing as "Chinese units". :)

As far as I know, thermistors of the kind we use are limited to 300C and I don't know how accurate they are at the extremes of their operating envelopes.

g.
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Re: Aliexpress Thermistor?

Postby Xenocrates » Wed Dec 16, 2015 10:12 am

I believe that it is in fact the thermistor from the data sheet. However, I believe you can exceed the rating and get to 300 C, although I believe accuracy would suffer due to this.

If you really want thermistors that are accurate, reliable, and are rated for those sorts of temperatures, you unfortunately have to pay for it. But since you want to cheap out, I'd order however many the minimum order is from this fellow, and then test them against a good thermistor, or thermocouple to make sure you've got reasonable accuracy. If they work, all the way up to 300C, order your 500. But make sure to test them at 300C, or whatever your peak temperature is, for an extended period. Most things have safety margins designed in. Hopefully there's enough of one on these.
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Re: Aliexpress Thermistor?

Postby nitewatchman » Wed Dec 16, 2015 11:17 am

geneb wrote:There's no such thing as "Chinese units". :)

As far as I know, thermistors of the kind we use are limited to 300C and I don't know how accurate they are at the extremes of their operating envelopes.

g.


Same units just written left to right and from the top of the page to the bottom.

In comparing Chinese material test reports to our surveillance test reports for the same material, you would sometimes think that they were in different units.

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Tincho85
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Re: Aliexpress Thermistor?

Postby Tincho85 » Wed Dec 16, 2015 3:38 pm

Well, I know it won't be the same as an Epcos or Semitec thermistor... you get what you pay for, or like we say here "es imposible pedirle peras al olmo".
Nevertheless, I do believe that somewhere in between there is a good non-expensive thermistor that can perform great in our deltas.

$0.35 + free shipping is a huge difference with the Epcos B57560G1104 (between $3 and $5)

If someone knows of a good thermistor that costs $2 or less, please tell.
(With leads >55mm and that can read more than 270ºc of course)
Martín S.

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Re: Aliexpress Thermistor?

Postby Mac The Knife » Wed Dec 16, 2015 8:27 pm

nitewatchman wrote:
geneb wrote:There's no such thing as "Chinese units". :)

As far as I know, thermistors of the kind we use are limited to 300C and I don't know how accurate they are at the extremes of their operating envelopes.

g.


Same units just written left to right and from the top of the page to the bottom.

In comparing Chinese material test reports to our surveillance test reports for the same material, you would sometimes think that they were in different units.


I really wish there was a "Like" button for comments like these.
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