Jackal

Halogen Bulb Atomizer

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Built a 250C mod box with 1600 mah 4S LIPO pack. Trying to get a DIY 50-100 watt halogen bulb atomizer to stop throwing "temp control" error in watt mode (or any mode). 

The atomizer with either the 100 or the 50 watt bulb runs fine on a 24VDC supply, and below is the measured data for the 100 and 50 watt bulbs. All help appreciated trying to get this atomizer working in the mod.

Cheers!

Jackal

 

 

 

USHIO 100 WATT.jpg

50 WATT.jpg

Edited by Jackal
Updated data for 50 watt bulb

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The DNA board doesn't have any TCR values for Tungsten by default. (Halogen uses tungsten filaments, which have an odd resistive curve if I remember correctly) Plus, it sounds like you are trying to get the bulb glowing hot? If that's the case you might need to fiddle with Escribe to see if you can manipulate things in the "safety" tab, like "Max Output Temperature". 

This is just my theory. Not sure if the board will even tolerate such a load. Good luck, hopefully you can figure something out.

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What gauge wire is the filament? And how many wraps?

How are you wicking the e-liquid?

Does the wicking and e-liquid surround the halogen bulb and touch it??

How about a picture of this atty?

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Was able to get the bulbs to fire in watts mode and with a custom DIY halogen materiel file created. The problem with tungsten filament used in halogen bulbs  is that tungsten has relatively low cold ohms (0.19-0.22 or so) and high operating ohms (0.9-2.0). Was able to get around this by setting the cold ohms higher that the actual cold ohms and this seems to work in watt and TC modes. As far as wicks, wraps, pics etc., will post some pics of the atty. The bulb will heat a metal container with a screen or pad on top for heating by convection dry, liquid and concentrate materials.

Cheers!

Jackal

 

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As noted above, got the 50 and 100 watt bulbs to fire in watt mode and also from a DIY halogen material temperature control file. The problem is that tungsten filament has a very low cold ohms and very high hot ohms. The way was able to fire the bulbs is to set the cold ohms higher than actual value (e.g., .33 instead of .19 on 100 watt bulb). Not perfect but works. As far as wicks, pics, etc., attached are some pics of the atty set up. It will be used for dry material and concentrates so no wicks will be used, but rather the bulb will heat a chamber with stainless steel screen or pad on top for convection heating. The pads can also be used for liquids, a few drops at a time.

Below is a pic of the halogen bulb in an RDA.

Cheers!

Jackal

20180730_141106.jpg

Edited by Jackal

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Here is the stainless steel pad inside of metal heating tube and installed over a mesh filament for testing.

20180730_143612.jpg

Edited by Jackal

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HUM.....  this is for e-liquid??????     thinkin' that I can't comment further.... ☮️

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They do work great to drain battery for testing, etc, and also make a pretty decent, long lasting heat source for an atty.

Below is a table with commercially available halogen bulbs on the left part of table (W1, V1, I1, R) and how they will perform on the DNA 250C on the right part of table (R, W2, V2, I2).

Cheers!

Jackal

Halogen Bulbs for DNA 250C.jpg

Edited by Jackal

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Working on battery curve for Tungsten is tricky. The cold ohms are very low and the live ohms are very high. A workaround is to adjust the punch preheat setting to warm up the filament so the the bulb can fire at the higher resistance setting. Below is a graph for a 50 watt 12 vdc halogen that puts out a maximum of 35 watts on the DNA 250C for various temperature setting, and the resulting live ohms and wattage measured. In the graph, W200, 400 and 600 are the watts at the set temps of 200F, 400F and 600F, with live resistance on the x axis versus output watts on the y axis. Using the graph, you can set the cold ohm resistance to adjust how many watts are delivered for the range of temperature settings.

Cheers!

Jackal

 

Halogen 50 Watt 12 VDC Battery Curve 03 AUG 18.jpg

dna250c 50watt 12 vdc halogen RWT Curves 03 AUG 18.jpg

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