Secret to temperature control?

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Hfs Vapr

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Mar 18, 2015
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hey guys , I'm having a tough time figuring out this temp control thing and was wondering if anyone would care to share some insight.

I've built a few different coils with 26g and 28g ni200 between .09 and .16

Right now I have a dual coil 28g ni200 spaced coil (can't remember wraps) on a 2.5mm id and I'm running it in my velocity clone on my vs dna 200. It's ohmed out at 0.11 running it at 60watts and 450f and it just seems like the vapour is lacking.

Thanks for any help
 

Ryedan

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Mar 31, 2012
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hey guys , I'm having a tough time figuring out this temp control thing and was wondering if anyone would care to share some insight.

I've built a few different coils with 26g and 28g ni200 between .09 and .16

Right now I have a dual coil 28g ni200 spaced coil (can't remember wraps) on a 2.5mm id and I'm running it in my velocity clone on my vs dna 200. It's ohmed out at 0.11 running it at 60watts and 450f and it just seems like the vapour is lacking.

Thanks for any help

I would do this: Wet the wicks properly and fire the atty for 3-4 seconds. While firing it check the wire temperature on the display. If it hits 450 the TC will kick in and drop the power to avoid the wire going over the temperature set. I believe you should also see the volts go down when that happens. That reduction in power will turn your 60 watt vape into whatever power the mod is actually putting out.

Let us know what happens.
 

Ryedan

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Okay I tried that and it topped out at about 460 and then watts came up and it was at 23 then 20 then 19 and kinda floated around there

So you're actually getting around 20 watts to the atty.

No there's no way, it's either 13 or 15

Ya, I thought 18 was a bit high. OK, assuming the coil ID is actually 2.5mm, 13 or 15 wraps should be either 0.08 or 0.09 ohms when it's cold. If the mod thinks the coils are 0.11 ohms the coils may not have been at room temperature when it set the resistance the first time you put it on.

Are you using resistance lock on the mod? If you put the atty on a resistance checker and lightly touch the coils, does the resistance change?
 

Mario06

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Nov 18, 2014
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You could twist your ni200 28awg with kanthal a1 30awg and that would give you a more sturdy coil to work with, less fluctuations and a slightly better taste.

But if you build a ni200 only coil use 28guage and make a perfectly evened spaced coil because with ni200 there's fluctuations if the spirals aren't perfectly distanced from one another, build it at 0.19 and remember that the fluncuations can depend on the tank itself (connectivity). You'll have to get used to building according to the tank in use.
 

edyle

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Oct 23, 2013
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hey guys , I'm having a tough time figuring out this temp control thing and was wondering if anyone would care to share some insight.

I've built a few different coils with 26g and 28g ni200 between .09 and .16

Right now I have a dual coil 28g ni200 spaced coil (can't remember wraps) on a 2.5mm id and I'm running it in my velocity clone on my vs dna 200. It's ohmed out at 0.11 running it at 60watts and 450f and it just seems like the vapour is lacking.

Thanks for any help

my guess is you jumped straight to temperature control with nickel coils without having much experience with drippers ??
in which case the problem is probably just airflow.

the coil needs to be directly in the path of the airflow.
 

Ryedan

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When I put it on a reader it reads .11 and doesn't move if I touch it. And I have not messed with the resistance lock feature yet, I thought that was just for bad fluctuation readings.

Hmm interesting, I might have to try one of these twisted ni k coils. Is that a general rule to use a smaller gauge knthal than nickel?

Good, that means the connections in the posts are stable and you should not get much resistance fluctuation in use. The problem IMO is your coils are out of calibration with the mod.

I don't know why that's the case, but your build numbers and your measured resistance are off by 20-30% depending on how many wraps you actually have and that may indicate an issue. It could be the build (high resistance in the post contacts with the wires), the mod, or the atty. Let's assume it really is 0.11 ohms.

Running the coil build through the Steam Engine coil calculator gives me a heat flux of 160 mW/mm² at 60 watts. That is not too high and IMO with wet wicks should handle a few seconds at 60 watts without any air flow and not need to have the power reduced to 20 watts to avoid going over 450F. Even if the coil is really 0.08 ohms, the HF would still be reasonable at 220.

I would do a wick singe test to check the calibration. Take the wicks out, flush the juice off the deck and the coils with water and dry the deck as best you can without damaging the coils. Blow it off to get the last water droplets. Turn the TC down to say 350 deg and fire the atty for a few seconds. If the coils start to glow stop immediately, that means the mod is not in TC mode which you'll need to fix before continuing. If the wires heat up with no glow leave the power on for about 15 seconds or until the coils are dry.

Put cotton in one coil being careful not to let it get even one drop of water on it. Put the temp to 360 and fire it for say four seconds. Slide the wick over a bit and check for slight singing (slight brown discoloration) where the coil was. If there is none increase the temp by 20 and repeat. Dry cotton will start to singe at around 410 deg. If it singes at a mod setting of 380, the wire temp is actually 410 so if you set 450 the mod will actually start to reduce power at a real wire temp of 480 deg. If it singes at 440, the wire is actually 410 so with a set temp of 450 will actually start reducing power when the wire is only 420.

Once the cotton has juice on it it will not singe at 410 anymore because the juice will never go away completely and will cool the cotton at least a bit even when you vape it almost dry. I've vaped a few wicks dry at 450 deg with not even a hint of dry hit.

If it singed at 440 and you want to set 450 for vaping, compensate by setting 480 and TC will activate at 450. Hope that makes sense :)

If you want to do it right, you'll need to figure out why the calibration is off and fix it. Either way will work though, so if you just want to get things going there is nothing wrong with compensating. I do it all the time with my DNA40 because I run titanium so the calibration is off from the get go and there's nothing I can do about it.

Also make sure you have the air flow options set up right on the Velocity and you're doing lung hits when you vape. If you don't do that you'll find at 60 watts TC will kick in while the wicks are still fairly wet.
 
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