Snails - Response on Threads Part 4

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AttyPops

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This is one of the features that the dna 40 is supposed to stop or help mitigate. the temperature control notes a rise in the temperature of the coil, that the vaper pre-sets, and backs off on the wattage supplied to the atty to prevent dry hits and burning of the cotton etc.

As I've mentioned before...I've been too busy this year to really keep up. How does it measure the temp at the coil?
 

Sgt. Pepper

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As I've mentioned before...I've been too busy this year to really keep up. How does it measure the temp at the coil?

lol... not at you. that's way above my pay grade. All I know is that you need nickel wire for it to measure the temp. You can set the temp control between 200-600 degrees. When the desired temp is reached the power to the coil is reduced to keep the coil at the desired level. I guess it's all in the chip.
 

Sgt. Pepper

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Hmmm....they are measuring the change in resistance due to heat...I'm guessing. It's an estimated/calculated temp...not a separate thermometer of any type. Still...very interesting.

IDK much about using nickel wire either. ;)

from what I understand, which is little, I believe that to be true. it's definitely not a separate thermometer.
 

tiburonfirst

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atty's got it ;) and pepper better better forget what he's learned about 'ohms' so far ;)

it is a resistance thermometer so it is just measuring the change in resistance and calculating the temperature from T = T0 + (1 / alpha) (R / R0 − 1) where T0 is reference temp for alpha, R0 is resistance at a reference temp and alpha is the temp coefficient for the material. In other words, once a certain amount of resistance change is noticed by the board relative to the cold value, it will throttle back the power.

I’m guessing that Nichrome/Kanthal can’t be used because where alpha for nickel is about 0.006 it is much smaller for nichrome (0.0002) which would require much more accurate resistance measurement, but in theory it could be done.

Those worried about nickel could always trick the board using iron wire which also has an alpha around 0.006.

back to cleaning ................
 

Sgt. Pepper

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that ^ i was referring to ;) you will not see a nickel coil with that resistance!

hiya, early morning survivor frannie !

what resistance are you speaking of because I never mentioned one? what I was saying is that my goal is not to go down as far as I could go, but rather go up as far as I could with the nickel wire. stop nit-picking me!:D I don't why I am saying anything because you always get snarky with me on cleaning day.:( Poor Pepper
 

Sgt. Pepper

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why are you so contrary today? ;) resistance is measured in ohms! you will not see a coil approaching 1 ohm with nickel wire :D


the pot calling the kettle black.:facepalm:

(insert) Jumping up and down emoticon. I know I'm not going to get a coil close to 1 ohm.:glare: Time to go to the gym. I need to work out some frustration.:D
 
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