Woot! I just found N2 Burst development tanks and bought them!

[gleaf]

You can air anything but the developer, N2 makes up about 80% of normal air. Oxidizing the Developer is early death of capacity.
Clean oil free air.. not inexpensive to have it once you add the additional system.
N2 (oil free) isn't that expensive.

[Jac@stafford.net]

It is my understanding, that consistent and even agitation was the primary goal and effect of N2 Burst.

And it obviated air bubbles on the film.

I need timers, solenoids, fittings, valves, hose.

Which prompts me to ask what you actually got.

[Tin Can]

And it obviated air bubbles on the film.



Which prompts me to ask what you actually got.

Wait and I will show when I get it. I got tanks, not a complete system.

[Tin Can]

Finding old threads with info.

http://www.largeformatphotography.in...rst-Developing

http://www.largeformatphotography.in...ding-your-own)

New N2 Burst systems.

http://www.tedpella.com/photo_html/photo5.htm

http://www.calstainless.com/emprocessors.shtml

The College method and rule book, very impressive!

http://metz.rose2.brandeis.edu/emdoc...book/book.html

The movie with live N2 bursting happening . Very exciting...Not! But it does show all kinds of good detail.

https://youtu.be/XQy0xQoULro

[Tin Can]

This is a good post from Lynn Jones.

http://www.largeformatphotography.in...l=1#post831325

[Tin Can]

Also finally read the subscriber section of View Camera Magazine, good info there on N2 Burst.

Today I got another piece of the system, a Kodak Gaseous Burst Timer Model 90B, gifted by a generous member here!

Thank you!

I am collecting bits, got surgical black latex USA tubing yesterday.

Ordered some 12 volt solenoids tonight and a mess of nylon fittings, all off eBay, all new USA made, and very affordable.

A tank and regulator will be next. Seems the DIY Beer Brewing industry is a good source for the regulator, manifolds, valves. Perhaps offshore. I'l inspect closely as 2300 PSI N2 is nothing to fool with, hose whip can be very exciting. A broken spud would be bad news even with the bottle tied down. I have seen the actual industrial safety movies.

[Peter De Smidt]

That's going to be quite the system! I look forward to seeing it.

[jbrianfoto]

I've been running N2 burst in my home lab for about 3 years. My Burst interval timer is turned on and off by the relay in my Gra-Lab timer. So I jsut set it for my desired process time, which in turn activates the interval timer (which regulates the length of burst and the interval between bursts). Besides the two timers all that remains is the N2 tank and a good gas regulator valve. The tank you need to purchase - when you go to get it filled they will just exchange it with a full one (I have two always full at home).

I am looking for a second 8X10 3.5 gallon tank that I can fill with fixer. My interval timer actually has two outputs, one for gas, the other for air. You can use air for fixer.

Big benefit of N2 burst, rock solid development for sheet film. No streaks or otherwise uneven sky tones. Once you dial in your times, the agitation is 100% repeatable and consistent. Once you try Gas - you'll never go back !

[Tin Can]

Sounds great.

Here is Kodak Pub 57 which explains all necessary parameters of Gas Burst.

http://kjnadvor.home.comcast.net/~kj...Kodak_E-57.pdf

[Tin Can]

I got my Velleman 555 timer, made in EU and Solenoid.

Works real well and quickly adjusted to Kodak specs. Cycled it for hours, in 10 minute powered up times. No observable variation.

I see Kodak highly suggests 'humidified N2' using a large filter housing with filter filled with water and a secondary empty filter to catch water drops before reaching the distribution plenum.

Easy enough, but I wonder if really necessary in hobby usage. They speak of orifice clogs from developer crystallization. I will add mine on the low pressure side.

I will do one setup that way. I'm making each 'timer/solenoid' set modular, in case I want to make multiples for color or any other plan.

Did you see this on eBay? I have had a lot of trouble with Time-O-Lites and don't trust them.

So it goes.