Maybe by removing the top of the atomizer and measuring the coil temp (with one of these probes with a laser pointer) while firing and blowing air over the coil. That would simulate the airflow during a draw.
TC accurate?
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Guess if one was using an RDA. RTA would be a bit of a challenge.
Decided to try myself but use the live resistance as a reference. Below is blowing vs drawing, same duration and if we were to use a TCR value of 0.00088, this would equate to a 15°C difference.
I guess it would be possible, with a bit of practice, to ‘adjust’ your blowing until it matches the airflow of a typical draw. Maybe use a small electric fan and place the mod further away until you have the perfect spot, then you can measure the live coil temp.
It could also work with an RTA, but only for very a very short time or if you have a helping hand dripping juice into the wells while you’re firing and measuring.
all i can say is that i have never gotten a dry hit when tc or tcr modes...
running a asmodus colossal with a mtl rta quite fine, the values of TCR on some chips changes and could be -/+ according other chips, for example TCR for SS on colossal is 0.0088 and the same values on my aegis solos brought poor vape, the raised to 0.0091 the vape were equal to colossal...
REgards
running a asmodus colossal with a mtl rta quite fine, the values of TCR on some chips changes and could be -/+ according other chips, for example TCR for SS on colossal is 0.0088 and the same values on my aegis solos brought poor vape, the raised to 0.0091 the vape were equal to colossal...
REgards
The values are connected to the metal, not the device. If a TCR value of 0.00088 works with one device but not another, then there are other factors involved. By changing the TCR value, you are telling the device this metal raises in resistance by that specific amount for every degree in Celsius.
Calculating Temperature Coefficient of Resistance is not difficult, basic high school math. But there are other factors involved for a device to pull it off with any degree of accuracy.
I am still waiting for the IR meter, last tracking says maybe in 8-10m days if the Aussy post uses ponys. PUNK, my Topside is not a YiHi chip.
I use both Wire (MTL) and mesh coils (VV/WOT) setups and have noticed a drop in flavor overtime when using TC. I am now thinking the mesh coil seems to have variable temperature character (resistance ?) after a few days and am scratching my head on this, to some extent this also seems to be the case using wire, but not as noticeable. I am now thinking that because I prefer a coolish vape and sweet juice a build up of gunk/carbon will have a insulating effect (heat flux), I typically puff 2-3 secs. When this occurs I will switch to power mode and do some heavy puffs which seems to help. These symptoms appear after about 15 mils of juice (guess).
One thing, this seems to really reflect the learning curve of vaping as related to tech, vape style, juice and hardware.
I use both Wire (MTL) and mesh coils (VV/WOT) setups and have noticed a drop in flavor overtime when using TC. I am now thinking the mesh coil seems to have variable temperature character (resistance ?) after a few days and am scratching my head on this, to some extent this also seems to be the case using wire, but not as noticeable. I am now thinking that because I prefer a coolish vape and sweet juice a build up of gunk/carbon will have a insulating effect (heat flux), I typically puff 2-3 secs. When this occurs I will switch to power mode and do some heavy puffs which seems to help. These symptoms appear after about 15 mils of juice (guess).
One thing, this seems to really reflect the learning curve of vaping as related to tech, vape style, juice and hardware.
Mesh follows the same principles and physics a wire coil does. Burnt sugars can cause the resistance of either to jump erratically. But do not think that is your problem.
You have a DNA device. Using the Device Monitor, screen capture when the vape is to your satisfactory and compare to when the flavour drops. And you can compare both of these to when you switch to wattage mode for a couple of heavy puffs and what ever changes this may cause.
I wouldn't get my hopes up on a Chinese IR meter being sold for $6 to be anywhere close to as accurate as they claim. Before using it to validate the reading on your boards/coils, I would find some way to validate that meter. If you have a good digital meat thermometer, you could heat a metal pan and check it's temp with the thermometer and the IR meter to see if they agree. You can use really anything that you know the actual temp of to test the meter but I would definitely verify it's accuracy.
totally in the point, the official or most common value used is 0.00088, on most asmodus and dna chips the value works and brings the same performance, on some other chipsets you have to manually adjust it otherwise wont get vapor at all...
I vape TC only and also stay below 450F. One personal recommendation is to choose titanium wire for coils. Titanium will give a more reliable vape as it yields larger resistance changes for a change in temperature. And added bonus is no worries about chromium and other alloys in stainless. I use Temco RW0499, Titanium Surgical grade 1 annealed, 26GA and rayon for my wicks. 50' was $9 and will last a very long time
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Well I just received the IR meter and have checked performance using boiling water and a K junction on a Fluke Digital meter +/-2 deg/F. Early testing gave disappointing results....using a Profile/SS Mesh with wet rayon wick and 4 sec burn gave a low 75F. I will continue to play but this would seem to be a bust.
The DNA is going to be the gold standard. They invented TC vaping. Their boards are the most accurate and feature rich (and expensive).
That said, there are other good boards out there. I used the Voopoo Drag for a long time and found its performance good.
No, they are merely measuring the change in resistance of the wire and then calculating the temperature based on known values of that kind of material. This is how resistance thermometers work. Usually in industry they will use platinum wire wrapped around glass as a thermometer. Resistance thermometer - Wikipedia
DNA boards cost more because 1) They do all the R&D that everyone else copies and 2) Their boards are actually made in the USA (from start to finish). It is very rare to find any electronics not made in China, so for it to be made in the USA increases costs.
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I am finding that it only takes a relatively small resistance change in the coil to alter the vape, gunk/carbon buildup. Power mode seems more stable overall IMO.
If carbon and juice junk are affecting your TC performance, would you not take that as an indication that it is time to clean the coil? Power mode will gunk up just as quickly but will not take a performance hit for it does not rely on accurate resistance like with TC. It’s just going to apply power - which means you are vaping that gunk/carbon and at higher temperatures. Eventually power mode will take a performance hit, but by this time your coil/wick will look like a piece of coal.
It's well known that carbon build up can change the cold resistance of a coil. But that change has to be significant enough in order to affect the detected performance with TC. Can’t speak for other devices, but DNA’s are quite sensitive to changes in cold resistance. If your carbon build up is enough to change cold resistance to where it affects TC performance, then I would question why it is not triggering a new coil indication by the device. At least with your DNA
You should also be able to see this change in resistance. The device screen maybe limited, but the Escribe software can display resistance down to 1 milliohm (0.001 ohms). It also allows you to plot the performance of the coil in real time, which will display any performance deficiencies.
Agree, good info. My DNA devices are indeed more sensitive to coil resistance, unfortunately this usually occurs rather quickly after a clean and wick. I guess my juice and preference for a cool vape means faster gunkup. When to rewick is a personal choice, I can detect flavor loss after about 5 ml or a day. Flavor loss in TC mode can be rather sudden whereas it seems more gradual in Power mode, also mesh coils seem to last longer given the same use.
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