But that .1r of voltage drop remains consistent. It does not vary meaning it has little or no effect on the temperature control. A .1ohm coil would read about .35 at temp. If you have an additional .1ohm due to bad contacts, it would read .2 cold and .45 at temp. The variation between cold and hot would still be the same.
Is temperature control worth it?
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I understand that but the end result is that the temperature can be wildly off, relative to the temp number you set. If the various voltage drops are stable then everything works except the actual temp setting is rather meaningless (more like a dial calibrated 1-10). If the voltage drops are not stable then things would go very bad. I have not had that problem much (but have on odd occasions). But I suspect some people have, and in some cases it's affected the choice of atty's for example, where people are picking atty's because of their electrical characteristics and not the atty they want for taste. Some people have walked away from temp control, I suspect because they never got past those unwanted circuit resistances.
You aren't getting what I am saying. The variation is still .25ohm in both cases so the variation in resistance is still the same and the temp will still be the same. It is the variation in resistance that is used to calculate the temp. Also, if resistance from the atty is randomly jumping around, there is a problem. A loose contact should be fixed or the atty should be discarded. I haven't had one yet that randomly showed different resistances every time I put it on a mod. That could be dangerous on a mech. Shows .5 on a tester but randomly drops to .1ohm when moved to a mech mod? My Freakshow, Derringer and the Velocity I got today all show the same resistance down to the hundredth every time I throw them on my mod.
I do get it. *If* the other resistances stay stable the temp control works, but the indicated temperature you set is just meaningless. But the vape is consistent and stable. From what I've seen, a 1/10th ohm drift will drift the temp 100F or so. So your example of 0.5 --> 0.1 is far more extreme than what it takes to confuse the chip. A tenth of an ohm variance would not bother a mech unless the coil resistance was some insane value like 0.2R to start with. (which may be the case these days for some people )
Here's my take: most of the new mods coming out have it. Its worth trying due to the consistancy of the vape. If you don't like it, that's fine. They all work with kanthal, too. These new mods are less expensive than their predecessors as well. Nothing to lose if you're buying a new mod anyway.
No, you don't get it. Do you really think that a .1ohm build is safe on a mech? Even more so if you think it is a .5ohm build? A single 20 amp will work with .5 but how about a .1? I haven't had an atty yet that drifts for no reason. The resistance of Kanthal changes with heat, but not as much or as consistently. Even if your contacts are dirty or you run a heat sink and you pick up an extra half ohm of resistance between the coil and the mod, the variation between the coil being cold and hot will still be the same and the temp control will work. If there is a problem causing random changes in resistance while firing, I wouldn't use that topper again until that problem is fixed.
I truly do get it. Your example is not real world. If you use something like Steam Engine to compute a 0.5R coil, and it ends up 0.1R, you have a near dead short in the coil. The far more likely scenario is that you calculate a 0.5R coil but it ends up HIGHER resistance, not lower resistance. So I don't know why you keep hanging on this mech safety issue. It isn't really relevant to the problem of unwanted ADDITIONAL resistance.
In your example where you pick up an extra half ohm of resistance, the problem there is that it would throw the actual temp far outside the adjustable limits (on my EVIC-VT the range is 200-600F and I've had real world situations where the drift was such that I needed to go higher than the 600F the mod allowed, resulting in a cooler vape than I wanted). In the real world, at least the world I've seen, the unwanted resistance drift is more in the range of 0.1R or less, or *maybe* 0.15 or 0.2R.
The point I was trying to make is simply that a circuit that gets confused because of a few hundredths of an ohm drift over time is "poorly engineered". Especially given the number of purely mechanical electrical contacts it relies on (unsoldered). Despite that, this very imperfect system works pretty well as long as people don't get too hung up over absolute temp value settings. 400F on the dial is not necessarily 400F. On any given day it might be 300F or 500F. That is the nature of this beast.
Sorry, but you truly do not get it. The example I used with the mech was to say that any atty that randomly changed resistance would be unsafe. I've never used steam engine. I wrap a coil, secure it, then check the resistance. Wire is cheap and worth trashing a few inches for some practice. A few bucks for 100 feet? No biggie. With nickel, I'm mainly concerned with getting as much as I can in the device I am using, not what I specs out to.
I have some cheap clones and yet I don't have any that randomly change resistance. Now, I do take the temp shown on the screen with a grain of salt. It may not be perfectly accurate to the hundredth of a degree, but if I find that a juice works best with a given temp on a given atty, anytime I use that juice on that atty at that temp, it is what I remember from the previous use. Very consistently repeatable results are what matters to me and temp control gives me that.
If you're seeing that much drift while using your mod then something is wrong with your atty. I've been using TC mods for several months now and I have yet to have a TC coil "drift" by more than .01R. If the coil measures at .1R at room temperature when I first fire it I can be certain it's going to stay there all day long. Over the course of time I've had coils slightly increase in resistance, but the mod compensates for that by setting the baseline higher. Since it's only measuring the amount of resistance change while you're firing the mod it stays accurate.
And are you really saying your getting significant resistance drift while firing the mod? I sure would like to know how you're measuring that and able to determine how much resistance change due to heating and how much resistance change due to drift while the mod is being fired. Care to explain this method of measurement you're using?
TC mods are unaffected by resistance change over time. At least mine sure is. Before you fire the mod the baseline resistance is measured. If that baseline changes then the mod compensates, or in some cases you press a button and force it to compensate. It only measures the amount of resistance change while it's actually being fired, so even if your baseline increased from .1 to 1.0 it would still only measure the .3-.5ohm change that takes place as the coil is being heated.
To use an extreme example here, if I switch between my Starre with .12ohm coils to my Nautilus with .3ohm coils I just press a single button once and it corrects the baseline resistance so the TC remains accurate. That's an instant .18ohm change in resistance but the temperature is accurate with no more effort than pressing a single button one time.
And again, if your atty is randomly changing resistance by .1ohm or more, something is wrong with your atty or your coil build. I've NEVER had that happen unless I screwed something up and had a short.
Have you ever seen a Mechanical Thermostat? A coil that expands and contracts through heat and cooling of the metal.
Hmmmm............ These are likely more accurate at controlling whatever temp you settle on.
The Baseline set Coil is the Controlling factor. Even one with a Dedicated probe would require software to control it.
That wasn't my example that drifted by a half ohm. But I've had mods drifts by about 0.05R over time (days). Requiring re-locking the baseline temp. So it is not true that "TC mods are unaffected by resistance change over time". Unless you constantly monitor the actual resistance on a cold coil and re-lock resistance whenever it changes by more than 0.01R or so.
I really give up. My point was that a change of a few hundredths of an ohm is very meaningful for a TC calibration. It won't make a mech mod blow up. You are the one talking about half ohm changes, not me. Any of these resistance issues is only going to RAISE the resistance and LOWER the power in an unregulated device. Not a safety issue UNLESS a dead short occurs which would be totally out of scope of this discussion. Please do not respond. I really give up.
I hope you give up. You seem to be inclined to mistrust TC. That's fine but don't spread lies. Again, you mentioned using a faulty atomizer that had a random issue with false readings. I said that was bad, something that shouldn't be used and gave an example. You seem to be incapable of understanding that. I gave up on you, but am posting to make sure others see the meaning of my posts. When you misunderstand what is being said, someone skimming through may not catch the whole thing. A reply gives them a better chance to understand what is being said. How about you don't reply? I don't take orders well so that is your best bet...
The TC threads are filled with people having issues related to tiny drift in resistance readings, although it is not always obvious. If you want to find that observation to be some sort of lie, you are welcome to your opinion. Not every atty drifts, but many do.
I would hold off as well, I have 2 devices with both temp control devices the E Vic VT and the Heatvape Invader Mini, honestly I do not really find much difference in the temp control function. Maybe a little warmer but nothing really special.
The way I understand it, for a given set temperature any coil will rise xx% of resistance. So for example if our set temperature needs a +50% rise in resistance:
- a 0.15ohm coil will rise to 0.225ohms
- a 0.5ohm coil will rise to 0.75ohms
- a 1.0ohm coil will rise to 1.5ohms
"Temp control" is just another (attempt) way to regulate your vaping experience. Some of us have found it useful while others have not.
- a 0.15ohm coil will rise to 0.225ohms
- a 0.5ohm coil will rise to 0.75ohms
- a 1.0ohm coil will rise to 1.5ohms
"Temp control" is just another (attempt) way to regulate your vaping experience. Some of us have found it useful while others have not.
I haven't seen them. I've seen some junk mods being an issue as well as people not building very well. An atty should not randomly change resistance, it's as simple as that.
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