Temp Control chips

[itssme]

The Evolvs are the only really good boards available IMO, DNA25 or 40 for very small mods or DNA200 is still very compact, I just built one and it only takes 18 x 10.3 x 71 mm room inside a box with 1.6 mm walls like a Hammond, a bit less with thicker walls, the 950 mAh LiPo is only is 72x25x20. The YiHi SX350Js are bigger, more expensive, only a ODA warranty, have really strange pulse frequency modulated output and don't seem to monitor the temp in real time, by reports they just measure R twice a second between pulses, I had one and it was about 150 F out with the temp sensing.

No board ATM monitors coil temp... they work from algorithms loaded for specific coil materials. Providing the resistance between the mod side of the +pin and the + side on the atty side is not mad..temp control should not be effected...be it a "Fat Daddy, Thin Daddy....Daddy with Cholera or any other 510!

 

[Vaping Bad]

No board ATM monitors coil temp... they work from algorithms loaded for specific coil materials. Providing the resistance between the mod side of the +pin and the + side on the atty side is not mad..temp control should not be effected...be it a "Fat Daddy, Thin Daddy....Daddy with Cholera or any other 510!

The first sentence contradicts it's self you say they don't then say how you think they do. Just because they use the voltage and current to measure does not mean they don't measure, nearly all electronic sensing devices express what they are measuring as a voltage.

Any connection issue can affect the measurement as the differences are so small, dirt or oxidisation on the 510 of the atty will put the temp sensing off by tens of degrees. Poor 510s and atties cause most of the problems people have with temp limiting drifting. Just like dry solder joints cause problems poor mechanical connections cause problems.

I don't know how much of a problem the FD connectors cause as they are too big for the mods I have made and just can't use them, I am just passing on what others have said and I would expect you could improve them with a stronger spring.

 

[itssme]

The first sentence contradicts it's self you say they don't then say how you think they do. Just because they use the voltage and current to measure does not mean they don't measure, nearly all electronic sensing devices express what they are measuring as a voltage.

Any connection issue can affect the measurement as the differences are so small, dirt or oxidisation on the 510 of the atty will put the temp sensing off by tens of degrees. Poor 510s and atties cause most of the problems people have with temp limiting drifting. Just like dry solder joints cause problems poor mechanical connections cause problems.

I don't know how much of a problem the FD connectors cause as they are too big for the mods I have made and just can't use them, I am just passing on what others have said and I would expect you could improve them with a stronger spring.

No I dont! You said that the 510 affects how the temperature is monitored by the board....the board does not regulate or monitor the temperaure on any device at the moment......none!

I said that the board is programed with an algorithm for a given material....Ni or Ti.....The board measures jack poop, other than resistance! The board has been programed to a given spec....the resistance of Ni @200f is x, the resistance of Ni@300f is y. As the resistance of Ni or Ti is predictable it is easy to program a chip to match that curve (which is why it is difficult for Kanthal because the resistance is all over the place per given temperature).

So I didn't contradict myself at all.... no board monitors temperature, they monitor resistance........I doubt that the fluctuations of a big dob of brass in any 510 will affect the resistance!

So....yeah I am right and have not contradicted myself...maybe you need a better understanding of what you are working with is more to the point!

 

[Vaping Bad]

No I dont! You said that the 510 affects how the temperature is monitored by the board....the board does not regulate or monitor the temperaure on any device at the moment......none!

I said that the board is programed with an algorithm for a given material....Ni or Ti.....The board measures jack poop, other than resistance! The board has been programed to a given spec....the resistance of Ni @200f is x, the resistance of Ni@300f is y. As the resistance of Ni or Ti is predictable it is easy to program a chip to match that curve (which is why it is difficult for Kanthal because the resistance is all over the place per given temperature).

So I didn't contradict myself at all.... no board monitors temperature, they monitor resistance........I doubt that the fluctuations of a big dob of brass in any 510 will affect the resistance!

So....yeah I am right and have not contradicted myself...maybe you need a better understanding of what you are working with is more to the point!

You don't know what you are talking about. EG "which is why it is difficult for Kanthal because the resistance is all over the place per given temperature" Kanthal has a very stable resistance with temp change, a low Thermal Coefficient of Resistance (TCR) which is why it is no good for temp limiting.

So a quick primer for you I wrote last week on another forum, it is over simplified as devices vary.

TCR Temperature Coefficient of Resistance are the rate the coil changes resistance with temp, some newer boards allow you to set these.
Nickel: 0.00641
Titanium: 0.0033 (but have also seen different values like 0.0035 for "Titanium 1" so best to ask who you got your wire from)
SS 317L / Haywire: 0.00094 (again ask the vendor as it can vary)

The higher the TCR number the more accurate the temp sensing will be, Kanthal and Nichrome have very very small TCR so no good with current tech for temp sensing.

How it works (simplified)
The TCR number is how much the resistance rises per degree Celsius above 20 C, EG at 200 C the temp has changed by 180 C so you would multiply the 20 C resistance by 180 * the TCR and add the result to the 20 c resistance. If at 20 C or cold R = 0.5 ohm then 0.5*(200-20)*TCR+0.5 so for Ni 0.5*180*0.00641+0.5 = 1.0769 ohm @ 200 C.

 

[itssme]

You don't know what you are talking about. EG "which is why it is difficult for Kanthal because the resistance is all over the place per given temperature" Kanthal has a very stable resistance with temp change, a low Thermal Coefficient of Resistance (TCR) which is why it is no good for temp limiting.

So a quick primer for you I wrote last week on another forum, it is over simplified as devices vary.

TCR Temperature Coefficient of Resistance are the rate the coil changes resistance with temp, some newer boards allow you to set these.
Nickel: 0.00641
Titanium: 0.0033 (but have also seen different values like 0.0035 for "Titanium 1" so best to ask who you got your wire from)
SS 317L / Haywire: 0.00094 (again ask the vendor as it can vary)

The higher the TCR number the more accurate the temp sensing will be, Kanthal and Nichrome have very very small TCR so no good with current tech for temp sensing.

How it works (simplified)
The TCR number is how much the resistance rises per degree Celsius above 20 C, EG at 200 C the temp has changed by 180 C so you would multiply the 20 C resistance by 180 * the TCR and add the result to the 20 c resistance. If at 20 C or cold R = 0.5 ohm then 0.5*(200-20)*TCR+0.5 so for Ni 0.5*180*0.00641+0.5 = 1.0769 ohm @ 200 C.

yeah.... ok, you win....I am not getting into a pissing up a tree competition with you...have fun with your builds!

 

[adjam1972]

single...turned up today, just bench powered it n it said hello on the screen.....might have it built by the end of the week, letcha know!

Look forward to seeing the results.

 

[itssme]

Look forward to seeing the results.

Hiya mate...lol, I have built it already..... here is the link to the thread. http://www.planetofthevapes.co.uk/f...sion/all-things-mod-making/78418-my-next.html

 

[adjam1972]

Hiya mate...lol, I have built it already..... here is the link to the thread. http://www.planetofthevapes.co.uk/f...sion/all-things-mod-making/78418-my-next.html

Cheers will take a look. Been offline for last couple of days as we took our boy to longleat and I can't access the forum from phone without WiFi.