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Aliexpress Thermistor?
Posted: Tue Dec 15, 2015 9:51 pm
by Tincho85
Hello all, I need a little help please.
What do you think of this thermistor?
LINK
SPECS FROM SELLER:
He claims that it can read up to 300ºc but the only datasheet that I could find says it can't.
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?
Re: Aliexpress Thermistor?
Posted: Wed Dec 16, 2015 2:10 am
by teoman
Sometimes they can write the stuff in chinese units.
Re: Aliexpress Thermistor?
Posted: Wed Dec 16, 2015 8:37 am
by geneb
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.
Re: Aliexpress Thermistor?
Posted: Wed Dec 16, 2015 10:12 am
by Xenocrates
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.
Re: Aliexpress Thermistor?
Posted: Wed Dec 16, 2015 11:17 am
by nitewatchman
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.
Re: Aliexpress Thermistor?
Posted: Wed Dec 16, 2015 3:38 pm
by Tincho85
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)
Re: Aliexpress Thermistor?
Posted: Wed Dec 16, 2015 8:27 pm
by Mac The Knife
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.