Please help me to choose cable to extend TO-92 sensor legs

Epoxy or UV?

I would say you're over-thinking it. Almost any adhesive or sealant would be fine, provided it's not (very) conductive. You mention fast-drying; if it were me, I'd use a dab of Araldite Rapid, it's easily available and inexpensive (compared to industrial adhesives or sealants) and sets fast.

Since you have a cable egressing, you'll need a bit of flexibility plus strain relief as well as water-proofness there, and all three of those are easily handled with a small length of typical adhesive-lined heatshrink sleeving.

HKPhysicist You can always go with one of the Maker's best friend - hot glue.  That's what I used way back in 2021 during Build Inside The Box.  I'm not sure how much it will shrink in the cold, but at low volumes of glue, it shouldn't be that much.

Hello Friend,

Thanks for your opinion.  I am glad you also use MCP9700.  It is cheap with good precision.

Hello Shabaz,

Thanks for your recommendation.

I have found this in Element14:

https://hk.element14.com/araldite/ara400001/adhesive-epoxy-2-15ml-yellow-tube/dp/2079740

That will work, although that's the slow-set version. If you can find it elsewhere in your region (it doesn't appear to be available at the hk.element14 site), there is an approx 5-minute set time version called Araldite Rapid. There's also a 90-second set version (Araldite Instant), that's convenient too. They are generally available, not specialist, so they may be available via Amazon.

I sometimes use what I believe is nail adhesive, it's thick as if it were a clear type of putty, with a UV torch. Very convenient!

shabaz You may be right that the same UV adhesive is marketed for many uses.

Thanks for the question. Ive been typically using PTD and NTD thermistors, didnt know these devices even existed.  One supplier listed them as digital, but datasheet says analog, Im going with the datasheet. 

I've started a project that uses thermistors, but seeing this device, I'm changing it to these TO-92. 

Stopping by to say THANKS ! 

Try using adhesive coated heat-shrink tube.

Use a piece long enough to give overlap onto the cable and beyond the sensor.

Heat it and it will stick to the cable on its own, while it's still hot and the glue inside is molten crimp the other end with pliers so it seals up.

The picture below illustrates the technique but on a rather larger scale:

MK