You didn’t talk about concentration measurement or control; can you shed some light on these for me? Sure! I suggest that when you first install a chemistry wash system you check once a day for the first week and then once every 2-3 days after that. Don’t be fixated on a number or you will drive yourself nuts find a range and test to that.
What temperatures are common chemistries run in these types of applications? Typically, I choose to run between 140 degrees F and 150 degrees F for most applications.
Is foam a common issue in cleaning with a chemistry? Well, we do have a few very insightful previous Tech 2 Tech presentations on foam which I would encourage you to watch, but to answer your question, a little foam is not a problem as we are spraying in air but anything over 3-4” can be annoying. However, let’s examine why you are seeing the foam and better yet where are you seeing the foam.
Is the position of the board critical to the chemistry wash process? It can be. I always like to position cupping points, areas that may hold wash water in a downward position so they can drain easier. I also like to consider tall components when I position a board and see if I can get a happy medium with them all. You may have to experiment to see which position works best for your process.