A circuit for temperature control of the atomizer coil

[kinabaloo]

Actually it works to our advantage - a dry coil would have a higher resistance if the juice is conductive - so no worries

[kinabaloo]

Some figures from mogur: nominal resistance: 4 ohms; increase in resistance circa 200C: 0.15 ohms. So the change is about 3% - small but not too small; I think it's enough to work with reliably.

[surbitonPete]

Pete - I am near Heathrow airport - pollution clouds building now

Added to my previous post.

Second hand tobacco smoke is absolutely certain to harm your health but all that exhaust pollution is nothing to worry about........lol.

[kinabaloo]

I think the deposit might be slightly conductive - but nowhere near the 4 ohm value - perhaps 4,000 ohms (wild guess) or higher.

[kinabaloo]

People often tal about the Mediterranean Diet - while thee are some reasons to believe that diet is healthier foodwise, I suspect the better weather (happier disposition) and increased vitamin D from sunsine play a big part too And the red wine

But nothing in this world has only one side ...

[kinabaloo]

We need oxygen for life but in the end we will lose the battle against being oxidised

[surbitonPete]

People often tal about the Mediterranean Diet - while thee are some reasons to believe that diet is healthier foodwise, I suspect the better weather (happier disposition) and increased vitamin D from sunsine play a big part too And the red wine

But nothing in this world has only one side ...

I think you probably summed it up perfectly there Kinaba.

[KoS]

What I was thinking was as the coil gets more and more gunk on it that it actualy needs to get hotter to give more vaper or more runnig time. Mabey this is a moot point with this circuit concidering it caps the temp so leving the hammer down for a longer time would be fine

[kinabaloo]

What I was thinking was as the coil gets more and more gunk on it that it actualy needs to get hotter to give more vaper or more runnig time. Mabey this is a moot point with this circuit concidering it caps the temp so leving the hammer down for a longer time would be fine

Indeed.

Without temperature control the atty coil is in danger when the deposit builds up. My teory is that this is because the deposit heat-insulates the coil such that it can get too hot (less cooled by the airflow). This is one of the ways that the deposit can eventually kill the coil. The other is by mechanical force snapping the wire as the deposit builds under it (discovered by SunVaporer). Most times it is probably these two things acting together.

[mogur]

Good morning, modders. Found a table at Nichrome 60 (NiCr) Resistance Wire that alleviates some of the math-

NiCr 60 Resistivity factors:
Temperature 68°F (20°C), Factor 1.000
Temperature 212°F (100°C), Factor 1.019
Temperature 392°F (200°C), Factor 1.043
Temperature 572°F (300°C), Factor 1.065
Temperature 752°F (400°C), Factor 1.085
Temperature 932°F (500°C), Factor 1.093
Temperature 1112°F (600°C), Factor 1.110
Temperature 1292°F (700°C), Factor 1.114
Temperature 1472°F (800°C), Factor 1.123
Temperature 1652°F (900°C), Factor 1.132
Temperature 1832°F (1000°C), Factor 1.143

These values don't quite match other NiCr TCRs I've seen, but it'll take some playing around, anyway. A place to start.