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firemanjim

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Reply with quote  #1 
I seem to be having issues with stainless steel (317L) and temp control. I have not tried any other wires other than kanthal.

When I first made my coils I put some cotton in the wick and set to 200C and fired it and immediately the cotton burst into flames.

With no cotton in the coils were pulsing bright orange - clearly not something expected from temp mode.

I tried again with another RDA. This time I set the temperature much lower at 150, tried spaced coils and didn't even try and fire until juice was on.

Extremely erratic vape experience. Sometimes it would work, other times it would throttle the watts to nothing.Even when working I could taste the warming and cooling significantly as the coils were pulsing. In the end I switched back to kanthal in normal mode.

The temp curve was downloaded from steam-engine and I recorded the results in the device monitor.

DNA200.jpg 

I have no idea what is going on here but it is certain it is not working correctly. 

Any ideas?

UKDTweak

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Reply with quote  #2 
I saw something similar on my mod with 317l, then i cleaned the 510 threads on both the mod and atty and its been solid since.
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Home made DNA200 in an Hammond 1550p with Dual 18650 :P

Moonshot Dual 18650 DNA200

M
oonshot DNA250
seankwong

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Reply with quote  #3 
Did you decrease the default preheat and load SS TCR into one the profile? If no, download a SS TCR csv file from steamengine website, load the csv file into one of the profile, temp set at 400F, decrease preheat to 15 and set fire wattage to 30w.

Build a spaced coil at 0.3ohm, juice the wick, put on the tank, select the SS profile on the mod and let it idle for 20 seconds.

Pulse fire it before vaping, make sure ohms are consistent and hopefully it works for you.
r4nd0m

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Reply with quote  #4 
I see this on my vaporshark dna200 - when using Celsius - when setting it to F it seems to work just fine ... might be worth a try as I can see you are using Celsius as well ..
eziotroito

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Reply with quote  #5 
Same story here... With 316L SS 0.60 first attempt and 0.50 second attempt, 6 wraps per coil - inconsistent temp curve staying at what device monitor says. No issue with nichel on the same atomizer. Later I'll try to use another atom and see what happens. To simplify tests o don't wrap and don't wick my coil just letting the wire looped and check device monitor while pulsing and firing. It just does not work. Downloaded csv files but did not change preheat and let it at 80 °C, how it wat set before on ni200 Check this pic

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firemanjim

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Reply with quote  #6 
dna2.jpg 

Thanks for the replies and the assistance!

I changed to F, used the settings as mentioned by seankwong and then tweaked them a little and it does seem less erratic - maybe there is an issue with Celsius?

Does this graph seem more normal?

firemanjim

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Reply with quote  #7 
Sorry for double post but after posting this went back and had a puff - back to erratic behaviour - nothing has changed other than a minute or so of time and here is what I now get - virtually no vape...

dna3.jpg 

eziotroito

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Reply with quote  #8 
Same issue here, man! Don't know what to do! Cleaned threading, brushed atom Pin and rebuild it again. No way to work for it! Just hoping for un update or something or waiting for Santa's/Jesus/Allah/Gamesh etc... PROBLEMASS.JPG 
James

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Reply with quote  #9 
eziotroito, does your mod have a mod resistance set?

If it *is* set but incorrectly and too high, it can cause control instability like this. Of course, if it is too low that can affect the accuracy of TC. It is much more important that your mod manufacturer set this accurately for SS. (If not, you can do it yourself, if you know/can measure it.) Nickel is less sensitive. You may get a better result with a higher-resistance coil, as that reduces the effect of mod resistance being set wrong.

It isn't a given that this is the problem, but certainly something to make sure of.

Also, do you have alternative wire you can try? The problem with SS is that (1) its resistance does not change as much as Nickel, and (2) it is an alloy and is not graded by electrical properties. That means not all SS is identical, so the curves may be off.
eziotroito

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Reply with quote  #10 
Hi @James,
thank you for support.
1) My mod is a tugboat and I found someone who told me to set mod resistance to 0.007 and that's what I did. But my mod came to me set with a "zero" value. So I trusted that guy and set it to 0.007 at first day I received it. I'll search how to run this test, anyway.

2) yesterday I thought that maybe my .12 ohm resistance was too low, so I built a looped wire of 20cm (no wraps) of SS 316L with a total resistance of .90 ohm to be sure that my too low resistance was not causing the issue, but with no good results.

3) My SS wire came from zivipf.de a German well known wire as one of the best on the market. Also asked around discovering a lot of people are in trouble with SS. Also, my zivipf wire is going really flawlessly for someone (304L,316L,317L) but not for me, so at the moment I was not able to say what exactly is causing this behavior

This weekend at vapitaly expo I'll get some 304 SS to try... Let you know and thanks for helping me
James

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Reply with quote  #11 
Hmm. 0.007 sounds very reasonable - many 510s are around this. Do try setting it to 0 to see if it helps stability though. It probably will not, but if it does that indicates the mod resistance was too high. I am surprised 0.90 Ohm did not help.
vrsnake

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Reply with quote  #12 
I am also seeing wildly fluctuating temperatures with SS316L (24g, made by UD) on multiple RDAs where the same atty with NI200 or T1-1 has rock steady temps.  I'm using an eFusion with the mod resistance set at 0.005 ohm.
PZenger

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Reply with quote  #13 
I'm having this same issue. Built up a 7 wrap 26g SS316L pair of coils. Put them on a sapor, wicked them up and the juiced them. The first pull was pretty good. Ohms were locked in at 0.21. Then it hit temp protect instantly and the voltage was wildly erratic. Exactly like this. I've been asking around to see if anyone has figured out why this happens but I can't seem to find anything. I'll keep looking though. 
watcher64

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Reply with quote  #14 
I am still a firm believer that it is because SS has such a flat TCR.  There is not enough variance in resistance for the chip to maintain temp without pulsing wildly.  But that is just my 2 cents worth ...
ufaiq

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Reply with quote  #15 
I'm facing the same problem gents, have reverted to nickel now.
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