Can’t get profile to TC

@Coolsiggy - Not sure I understand the series/parallel reference but I am not having issues with jumping resistance. Can’t speak for others. I can get TC to work with this mesh, I just do not like it and much prefer the Kanthal mesh. Only SS mesh I have tried so far is 200 from Vandy Vape. Open that other grades will perform differently.

Below is a couple of Escribe screen grabs that I stitched together that displays how this mesh operates. This is Vandy Vape 200 SS316L mesh cut to roughly the same size as a Wotofo strip. Everything below utilizes wattage mode only, TC is not in use. Purple represents the resistance, and green represents power in watts.

Subject A is dry firing the mesh at 40 watts with no wick. As normal, we see the resistance increase with time as the power is applied. This demonstrates that the mesh has a workable resistive range for TC.

Subject B is fully wicked and saturated but not drawing air across the mesh. At the same 40 watts we see the resistance climbs but plateaus – it does not increase with time as it should. This tells me the mesh is heavily influenced by the amount of saturation within the wick.

Subject C is also fully saturated but not drawing air across the mesh at 60 watts. Despite the great increase in power the resistance does not increase by any significant amount. In fact, using a TCR value of 0.00088 there is only a +7°C difference.

Subject D is drawing air across the fully saturated mesh at 40 watts. The 3ohm difference in comparison to subject B (same power) equates to ~-20°C using a TCR value of 0.00088 at the same room temp. This demonstrate the influence air has on the mesh on top of a saturated wick.

Subject E is a typical SS316L Clapton coil, fully saturated and with air being drawn across it. It demonstrates that resistance does continue to rise with time should power be applied. The coil is not as influenced with air and juice as the 200 mesh is.

So we can see that the 200 mesh can be heavily influenced by it’s environment which can make for a inconsistent vape. One can get TC to work, but must set up Temp Control within the limitations of the mesh. Using a TCR value of 0.00088 and a room temp of 27°C, subject D, which represents a typical draw with a saturated wick is only achieving ~210°C. And that does not account for any inconsistencies with draw pressure and juice saturation. If your temperature is set beyond this range, then TC is doing nothing for you which can result to the dreaded mesh dry burns.

Long post but hope it helps the OP with his issues.

 

Great stuff and very interesting. My series/parallel reference is based on the SS being woven and possibly losing contact between ovelapping wire strands. I only yesterday took delivery of my first DNA mod..a LV Paranormal and still learning the Escribe functions.
Using less capable mods and mostly Digiflavors 150 SS mesh I seem to get good results on the profile rda. Your data raises some interestings questions and is food for thought... grind the mind so to speak. Thanks for this effort.

 

Thanks. Not owning any Digiflavor mesh, I have no idea what the differences are vs the Vandy Vape. Reading up on mesh grades one document gives a “Typical Nominal Wire Diameter” for the specific grades. This leads me to believe that woven mesh can have a variance in wire size (within a certain degree) therefore have a variance in mass should the same metal be used.

One of the great benefits of a DNA is the ability to plot the performance of the coil within Escribe. Huge asset!! Arctic Fox firmware also has a Device Monitor with much the same functionality. And with having a visual on how said coil is performing, it does lead one to question how well other non DNA devices are operating, or if the inputted values are within a functional range. I guess if the end result equals a satisfying vape, then further analysis may not be required. But if one has an objective, such as a specific temperature or trying to mitigate dry burns, having that visual verifying your objective can be beneficial.

Enjoy the Paranormal.

 

@bombastinator – you’ve been quiet

 

You’ve been quiet in this thread – thought you’d have more of an input into the discussions