Even then, you'll need a lot of insulation and for best performance your should consider buying a 2nd oven and donating its elements to the first. We have done a huge amount of testing on both oven types, and only recommend convection ovens if more PCB space is needed. However, convection ovens are typically much larger and have less power for the volume.
Convection fan - there is no doubt that a convection fan is a good thing. Avoid those - you need to be able to control where the heat is coming from. Ability to heat top and bottom independently - some cheap ovens turn the top and bottom elements on together, with no way to control them individually. Also, Controleo3 will limit how much the top element is used to further reduce uneven heating. They are typically shielded with a perforated steel sheet which limits direct radiation. The compromise is to use quartz infrared elements which emit less IR. Commercial ovens use infrared elements, but only to heat the air which is then blown onto the boards. Infrared elements are usually a poor choice because they heat up dark components before lighter or shiny ones. Resistive heating elements are extremely slow to heat up and cool down, and make it difficult to follow a reflow profile. Type of element - the elements should ideally be quick to heat up and cool down. We add an extra heating element to bring the total power up to 1500W. Power - a lot of power is required to get the right rate-of-rise at high temperatures. Get the smallest oven that will work for you. Larger ovens require significantly more power to heat up. The oven in this guide is just 10 liters. Size - a small oven has less metal and air to heat up (less thermal mass). To choose the right oven, a number of things need to be considered: If you're looking for the Controleo2 build guide, click here.Ĭhoosing an oven to convert to a reflow oven 
If you use solder paste with a lower liquidus temperature - some go as low as 138☌ - you can get away with a lesser oven. Typically, prototyping conditions should mimic the production environment to avoid mass-produced surprises. This is what is typically used by contract manufacturers making commercial PCB's. This oven is designed to reflow lead-free solder paste with liquidus temperature around 217☌ (max temp around 250☌). It uses Controleo3, a 6-relay programmable reflow oven controller. The entire tray can be filled with PCB's, and all will reflow perfectly. The reflow oven build described here is fully capable of fine pitch lead-free soldering at very high temperatures, and can do it consistently and reliably.
REFLOW OVEN PROFILING HOW TO
Building it yourself will give you a better indication of what to look for, how it works and how to tune it to get excellent results. It isn't difficult to build your own oven, and the result can be equal or better than commercially available ovens. This guide will show you how to build a great toaster reflow oven.
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