Vapor Flask V3 DNA40 Clone thread
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No solution to get resistance reading right. It's a chip/software problem, common to all mods with that SXK chip. I am in discussions with them, have exchanged several emails, and they have promised they are going to fix it. There's quite a lot of difficulty communication technical information through the language barrier, so this weekend I am putting together a video to show them exactly everything I see. But so far they seem very receptive to understanding and fixing the problem (I don't quite know why they don't already know about the problem, but that's a different matter.)
So no we can't fix it except by waiting and buying fixed devices, when they appear. What we can do though is work around it for Temp Control.
The big issue with resistance readings for TC is that, as you probably know, the temp control calculations are dependent on the base resistance. The base resistanec is multiplied by the TCR in order to calculate the temperature of any given resistance rise. So if the base reading is wrong, the whole TC calculation is wrong.
But because we have Nickel Purity, we can work around the problem. That TC calculation uses two multiplicative elements: base resistance * TCR. We can't get the base resistance right, but we can change the TCR. We can therefore force the chip to come up with the right answer for a given target temp, by using a modified TCR.
My guess is that with TCR 38 you are getting TC kicking in a bit too early - it is not reaching your set temperature. You are perhaps compensating this by setting a higher target temperature. The other way to do it is to set a higher TCR. The latter will hopefully enable you to set the actual TC temp you want, and reach it.
For Ti I usually use a NP value of between 42 and 45. I wrote a Spreadsheet Calculator to automate this process - you put in the Wire Type, Target Temperature, the SXK Read Resistance (what it says on screen) and the Real Resistance (what another, reliable mod says the resistance is) and it tells you what NP value to use for your specified target temperature.
Here's a link to my post in the Beyond Ni200 thread where I announce the calculator, with its link:
Nickel Purity / Static Resistance calculator
Note that I am currently usually setting an NP value 2 or 3 lower than the calc says, I think there's a bug in it and I will fix that tonight.
Yesterday I bought some reasonably good quality temperature measuring equipment and some probes. I am going to use this to externally measure and validate the NP settings for a range of coils and resistance levels. I will also be able to validate the accuracy of various TC devices - the SXK, Waidea, the Kangxin Mini VFs, and others I own.
I bought this digital thermometer that supports two probes, with USB logging: UNI-T UT325 Contact Type Thermometer
Full specs:
As the UNI-T can monitor and display two probes at once, I figure this will mean I could put two probes in a single coil, perhaps one each end, and get an idea of how temperature varies across the coil. I can also measure a dual coil setup and see how well a given mod/build/atty regulates two coils at once.
I also got two of these 3mm probes.
And also two of these special thin-wire, bare-sensor probes: Type K fine wire thermocouple 0.13mm as well. They're made by a UK company, saying the following:
This is one of the smallest wire gauge thermocouples available just 0.13mm diameter these are manufactured in our UK factory using Omega TT-KI-36 wire class1 with a max temperature of 260°c, they are welded using an argon gas to stop any oxidisation and create the best weld possible.With a response time of 1 second in air makes this thermocouple ideal for applications like biophysics, medical research,gas chromatography etc.
I bought this digital thermometer that supports two probes, with USB logging: UNI-T UT325 Contact Type Thermometer
Full specs:
- Dual thermocouple inputs
- Works with type K, J, T, E, R, S and N thermocouples
- 0.1°C resolution
- High accuracy testing
- Portable, lightweight unit for easy portability
- Celsius, Fahrenheit and Kelvin selection
- Data hold function
- Auto shut down when left idle
- Low battery indication
- MAX/MIN/AVG modes
- Data logging - 100 records
- USB interface for downloading testing data
- High and low alarms
- High/lower signal output
- LCD backlit screen
- Auto calibration
- Electricity cut-off memory
As the UNI-T can monitor and display two probes at once, I figure this will mean I could put two probes in a single coil, perhaps one each end, and get an idea of how temperature varies across the coil. I can also measure a dual coil setup and see how well a given mod/build/atty regulates two coils at once.
I also got two of these 3mm probes.
And also two of these special thin-wire, bare-sensor probes: Type K fine wire thermocouple 0.13mm as well. They're made by a UK company, saying the following:
This is one of the smallest wire gauge thermocouples available just 0.13mm diameter these are manufactured in our UK factory using Omega TT-KI-36 wire class1 with a max temperature of 260°c, they are welded using an argon gas to stop any oxidisation and create the best weld possible.With a response time of 1 second in air makes this thermocouple ideal for applications like biophysics, medical research,gas chromatography etc.
Well I'm hoping for a solution about it's connection problems. I run it on single battery. the one under the 510 never works right. The other one, I have to find a sweet spot screwing the tap to make it work. As for lower resistant, I 'm aware of it and I can deal with it.
Ah OK, well that should just be a matter of scraping any gunk out the tubes out and rubbing them down with alcohol. That's worked for most people. One person had a bent pin I think but that's not common, most people it's just gunk in the tubes
You might also have grounding issues which involves removing the top plate and sanding the underside and also the top of the flask where it joins the top plate.
Loads of discussion and photos in the last few pages once you get a chance to go through them.
Once I've got SXK understanding the low resistance issue fully I will also inform them of the grounding/battery tube problems. Also Doris @ Focal has her engineers checking their new sample stock of flasks for the issues, so the Focal stock might potentially be more reliable than the FT ones were.
Yesterday I bought some reasonably good quality temperature measuring equipment and some probes. I am going to use this to externally measure and validate the NP settings for a range of coils and resistance levels. I will also be able to validate the accuracy of various TC devices - the SXK, Waidea, the Kangxin Mini VFs, and others I own.
I bought this digital thermometer that supports two probes, with USB logging: UNI-T UT325 Contact Type Thermometer
Full specs:
- Dual thermocouple inputs
- Works with type K, J, T, E, R, S and N thermocouples
- 0.1°C resolution
- High accuracy testing
- Portable, lightweight unit for easy portability
- Celsius, Fahrenheit and Kelvin selection
- Data hold function
- Auto shut down when left idle
- Low battery indication
- MAX/MIN/AVG modes
- Data logging - 100 records
- USB interface for downloading testing data
- High and low alarms
- High/lower signal output
- LCD backlit screen
- Auto calibration
- Electricity cut-off memory
As the UNI-T can monitor and display two probes at once, I figure this will mean I could put two probes in a single coil, perhaps one each end, and get an idea of how temperature varies across the coil. I can also measure a dual coil setup and see how well a given mod/build/atty regulates two coils at once.
I also got two of these 3mm probes.
And also two of these special thin-wire, bare-sensor probes: Type K fine wire thermocouple 0.13mm as well. They're made by a UK company, saying the following:
This is one of the smallest wire gauge thermocouples available just 0.13mm diameter these are manufactured in our UK factory using Omega TT-KI-36 wire class1 with a max temperature of 260°c, they are welded using an argon gas to stop any oxidisation and create the best weld possible.With a response time of 1 second in air makes this thermocouple ideal for applications like biophysics, medical research,gas chromatography etc.
This is a great idea. +1 for the lengths you're going too to test these mods.
Looking forward to reading about what you find.
Just received my iPV4 Black MOD! What a machine! This baby ROCKS!
The Vapor Flask V3 by Kangxin is going on a sabbatical until I get that new 510 connector to replace that crappy brass one with the threads all worn out.
The Vapor Flask V3 by Kangxin is going on a sabbatical until I get that new 510 connector to replace that crappy brass one with the threads all worn out.
Got a few SXK 60w VF v3's today
Still got the low ohm reading
Battery threads still needed cleaning
Top plate still painted on the underside
But no resistance issues from battery caps to 510 ground !
All gone in a few hours, so might get some more
Only issue I had was one auto firing
This turned out to be the fire switch cap incorrectly aligned/inserted
All sorted & that one went too
Had a look at the board whilst in there & soldering looks A1 now so looks like someone has had some practice
Still got the low ohm reading
Battery threads still needed cleaning
Top plate still painted on the underside
But no resistance issues from battery caps to 510 ground !
All gone in a few hours, so might get some more
Only issue I had was one auto firing
This turned out to be the fire switch cap incorrectly aligned/inserted
All sorted & that one went too
Had a look at the board whilst in there & soldering looks A1 now so looks like someone has had some practice
What's yer plans on this flasks? I'm curious as to why you purchased so many. Did you get a sweet deal on a quantity buy?Got a few SXK 60w VF v3's today
Still got the low ohm reading
Battery threads still needed cleaning
Top plate still painted on the underside
But no resistance issues from battery caps to 510 ground !
All gone in a few hours, so might get some more
Only issue I had was one auto firing
This turned out to be the fire switch cap incorrectly aligned/inserted
All sorted & that one went too
Had a look at the board whilst in there & soldering looks A1 now so looks like someone has had some practice
All sold prior to delivery really
Could sell another dozen or so tomorrow if I could get them but not sure as production has stopped due to parts I believe
My order was short due to this
Initial reason was FT stopped selling & I wanted one
I can tell you that for sure I like it but that rubberized coating would be a deal breaker.
It took my VS about 2 weeks and I'm real careful with my stuff. That is what I'm basing my opinion on but perhaps it's better stuff now...but I doubt it.
One thing I"ve noticed comparing the VF V3 to the iPV4 is that the iPV4 really kicks it.
At 20 Joules I'm getting a good hearty vape with lots of flavor and warm too. Temperature set a 420F
If I kick the Joules to the next memory setting at 30 Joules this puppy is cranking it.
For me the "sweet spot" is anywhere from 20 - 25 Joules, just wish I could save that 25 Joules setting.
Using a new matched set of the Efest Purple IMR18650 2500mAh 35A batteries. Will see tomorrow how the LG HE4 18650s do.
At 20 Joules I'm getting a good hearty vape with lots of flavor and warm too. Temperature set a 420F
If I kick the Joules to the next memory setting at 30 Joules this puppy is cranking it.
For me the "sweet spot" is anywhere from 20 - 25 Joules, just wish I could save that 25 Joules setting.
Using a new matched set of the Efest Purple IMR18650 2500mAh 35A batteries. Will see tomorrow how the LG HE4 18650s do.
My Kangxin flask has been taking a break as well, ever since I got my silver IPV4. Now I have a black one. I have been rotating Sony Vtc5's, Samsung 25r's and LG he4's in mine. They all seem to work well. Can't say that I see a big difference, but I usually take them out at about 1/2 charge showing and put them on the charger.
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