Check out the vapor phase products.  If you do BGAs, you'll get much  
better results with modern vapor phase reflow systems.  1-2 degrees is  
only doable in vapor (air boundary layer at the parts and shadowing  
means you have to have a higher air temp to ensure you hit the temp  
you need everywhere and with SAC that means overhearing components.

No environmental issues with the new perfluoroethers.  Cost of fluid  
is less.

My assembler switched and he's glad he did as am I.

He also added a solderpaste jet system to replace stencils.  Helps to  
prevent pillowing with BGAs as you can adjust the thickness of the  
paste that's deposited.  Since you'll be at APEX .....

Bob Landman
H&L Instruments, LLC

Sent from my iPhone

On Mar 17, 2010, at 10:34 AM, Leland Woodall <[log in to unmask]>  
wrote:

> Technetters,
>
> We're preparing to purchase eight to ten forced convection reflow  
> ovens
> to replace equipment we currently have.  We also have plans to attend
> APEX to check out the varieties available and their features.
>
> Being a Quality guy, I'm concerned about items that include:
>
> Ability to hold temp within 1 to 2 degrees C
> Flux management systems
> Nitrogen control, with expected levels of 50 to 100 O2 PPM (max 500  
> PPM)
> Oxygen analyzer type, sampling rate, etc.
> Seals, exhaust system
> 8 to 10 zones
> Board drop sensors
> Auto width adjust
> Ability to maintain parallelism from end to end with constant use
> Ease of maintenance
> Power consumption, cost of ownership
>
> I know that I'm missing some important items.  Will those that have a
> few minutes please add to my list and elaborate upon what I should
> investigate?  I'd especially like to hear about personal experiences
> with critical control designs (what's good, and what should be avoided
> with all costs).
>
> Many thanks, as always!
>
> Leland
>
>
>
>
>
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