TC beyond Ni200: Nickel Purity, Dicodes; Ti, SS, Resistherm NiFe30; Coefficient of Resistance
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Guys, I don't think so that Ti mods will be accurate with any kind of SS wire. If you set temp limit to 100°C the coil will be about 280°C with SS304. I think @TheBloke has calculated it.
If you need I can calculate the temperature offset for different type of wires. But I would rather chose NiFe52 instead of SS for these mods.
If you need I can calculate the temperature offset for different type of wires. But I would rather chose NiFe52 instead of SS for these mods.
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I have made a short formula just for this special case.
If your mod is in Ti mode and temp limit is set to 100°C you can calculate the actual temperature change of the coil with this formula: 0.28/TCR=dT
SS304: dT=266.6°C (T=dT+20°C=286.6°C)
SS430: dT=205.8°C (T=225.8°C)
The second one can work but I'm not sure that it will be really stable, it depends on the control algorithm of the mod.
If your mod is in Ti mode and temp limit is set to 100°C you can calculate the actual temperature change of the coil with this formula: 0.28/TCR=dT
SS304: dT=266.6°C (T=dT+20°C=286.6°C)
SS430: dT=205.8°C (T=225.8°C)
The second one can work but I'm not sure that it will be really stable, it depends on the control algorithm of the mod.
Thanks for the short cut. First, what does the constant ".28" represent? Secondly, can I just swap 68°f for 20°c when calculating in Fahrenheit?
Oh, and I see my evic will be off even further with 430 than with Ti, but in the opposite direction..well, poo poo!!! I hope it's stable.
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You are welcome! 0.28 is the percentage of the resistance change(dR/R) of the coil. This number is true only for Ti mode and 100°C.
dR/R=TCR*dT=0.0035*80°C=0.28
Unfortunately the TCR values are calculated in Kelvin therefore we can use Celsius because the steps are the same on both scales. So you have to convert the temps to Celsius (or K) at first.
Probably eVic is the best for this job.
Thanks again. Seems the IPV D2 suffers from the same underheating issues as the evic. My brother's D2 has to be run at the same temp (520-530°f) with Ti to get a warm vape. Builds and topper are indentical.
Seems that Zivipf have accumulated NiFe48 instead of 52, plenty of guages (24-30)
http://www.zivipf.com/epages/638622...h=/Shops/63862298/Categories/Heizdraht/NiFe48
Also more resistherm (NiFe30) guages available now..
http://www.zivipf.com/epages/638622...h=/Shops/63862298/Categories/Heizdraht/NiFe30
24g-32g
http://www.zivipf.com/epages/638622...h=/Shops/63862298/Categories/Heizdraht/NiFe48
Also more resistherm (NiFe30) guages available now..
http://www.zivipf.com/epages/638622...h=/Shops/63862298/Categories/Heizdraht/NiFe30
24g-32g
Nice I wonder when we will see some us seller for it
I just don't see the lure to wire with such high nickel content, of course it's much better than ni200 so there's that.
I guess to most the nickel isn't an issue and NiFe is a good TC wire.
I guess to most the nickel isn't an issue and NiFe is a good TC wire.
I suspect Zivipf NiFe48 is regular NiFe52, because they list the composition as "alloying elements: Ni 52 % ". So it's 52% Ni and 48% Fe, thus their listing of NiFe48.
In this case maybe IPV D2 can also work with a temp offset.
I have standardized the equation to make the calculations easier.
We have to know what is the actual TCR of the wire and what TCR is used by the firmware of the mod.
The equations contain temperature change so you have to subtract/add the room temperature (20°C) to get the actual temp.
This formula can be used to calculate the actual temperature of the coil:
Let's do an example.
We would like to use Nifethal52 on a Ti mod what is set to 220°C.
TCR(mod, Ti)=0.0035
TCR(wire, Nifethal52)=0.004
dT(set)=220°C-20°C=200°C
dT(real)=0.0035*200°C/0.004=175°C
T(real)=175°C+20°C=195°C
The second equation helps to calculate the temperature what has to be set on the mod to heat the coil to a desired temperature:
The question is what temp should I set on my mod if I would like to heat my Nifethal52 coil to 220°C on a Ti mod?
TCR(mod, Ti)=0.0035
TCR(wire, Nifethal52)=0.004
dT(real)=220°C-20°C=200°C
dT(set)=0.004*200°C/0.0035=229°C
T(set)=229°C+20°C=249°C
You guys are doing great work. This is starting to resemble a college course 
@jazzvaper I will try to collect the TCR for all the known wires.
Stainless steel types:
317: 0.000875
316: 0.000915
304: 0.00105
430: 0.00138
410: 0.00155 - this value hasn't been verified yet
NiFe alloys:
Pernifer36(Invar): 0.00117
Resistherm(Dicodes): 0.0032
Nifethal52(NiFe48 at Zivipf): 0.00405
Nifethal70(NiFe30 at Zivipf): 0.00506
Ni200: 0.0052 (20°C-200°C)
Titanium #1: 0.0035
(Niobium: 0.0028 - not verified)
Stainless steel types:
317: 0.000875
316: 0.000915
304: 0.00105
430: 0.00138
410: 0.00155 - this value hasn't been verified yet
NiFe alloys:
Pernifer36(Invar): 0.00117
Resistherm(Dicodes): 0.0032
Nifethal52(NiFe48 at Zivipf): 0.00405
Nifethal70(NiFe30 at Zivipf): 0.00506
Ni200: 0.0052 (20°C-200°C)
Titanium #1: 0.0035
(Niobium: 0.0028 - not verified)
You guys are doing great work. This is starting to resemble a college course
They are, aren't they? I'm just along for the ride.
The story with NiFe30 wires started with the Dicodes Resitherm NiFe30 made by Isabellenhutte in Germany. It`s an alloy of 30% Fe, 0.6% Al, 0.5% Mn, 0.3% Cr and the rest of 68.6 is Nickel. Because NiFe68.6 would have been an unlucky title, they named it NiFe30. I asked Thomas from Zivipf to get some NiFe30 wire and gave him some manufacturers links. When I got a sample from Thomas, I found out that it must be Kanthals NiFe70 ( Ni 70% + Fe 30% ) and so I asked him to get the NiFe52 too. Zivipf named the Kanthal wires the same way the Resitherm NiFe30 was named - % of Fe. ( maybe business competition is another reason
)Btw. The way chemical formulas are build : main element / side element + it`s percentage ( sorry for my english )
f.e. 48% Ni + 52% Fe would be called FeNi48
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I just compaired the Ohm/m values of the Kanthal Nifetherm NiFe52 and the Zivipf NiFe48 and there is something wrong.
Diameter mm--------------Kanthal----------------Zivipf
0.25mm--------------------8.76 Ohm/m----------7.5 Ohm/m
0.28mm--------------------6.98 Ohm/m----------6.0 Ohm/m
0.32mm--------------------5.35 Ohm/m----------4.6 Ohm/m
0.35mm--------------------4.47 Ohm/m----------3.8 Ohm/m
0.40mm--------------------3.42 Ohm/m----------2.9 Ohm/m
So the Zivipf wire would have a 14.x % lower resistance at 20C. Strange, I will ask Thomas.
Diameter mm--------------Kanthal----------------Zivipf
0.25mm--------------------8.76 Ohm/m----------7.5 Ohm/m
0.28mm--------------------6.98 Ohm/m----------6.0 Ohm/m
0.32mm--------------------5.35 Ohm/m----------4.6 Ohm/m
0.35mm--------------------4.47 Ohm/m----------3.8 Ohm/m
0.40mm--------------------3.42 Ohm/m----------2.9 Ohm/m
So the Zivipf wire would have a 14.x % lower resistance at 20C. Strange, I will ask Thomas.
Isn't it 0.0060?I will try to collect the TCR for all the known wires.
Ni200: 0.0052 (20°C-200°C)
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