The DP thing can be somewhat confusing it's kinda "oh now I understand" when it does sink in, I can understand the frustration.Eeyore wrote:Yeah, I've read the 101 and a lot of other threads on here. I just wanted to make sure I understood the 0-16" and in your example 0-300 cfm. It seams that the value is always given as an absolute, as in 300 cfm and 16". I wanted to make sure I was correct that in use it is a variable and that is what the DM or water manometer is measuring. I got it, that's what I thought, I just didn't read it that way. I need to make another longer post, but this is probably the wrong area. Thanks Bruce!
Oh one more thought. I think I read somewhere on here that you were thinking of offering a DM that worked at a lower differential (less than 16"), is that still a possibility? Just seems it would lower the vacuum motor demands.
Thanks again!
Your post actually made me think about doing a simple Flowbench 101 video for the new user going over some of these items to give those who are new to what a flowbench is and how it basically works.
I actually have built a DM using a 8.5" sensor way back when but found it would offer to much bounce in the numbers same as you get with to little rise in a water gauge. I know there are a few differing opinions on DP and power required for a flowbench of which I'm not going to get into a big debate over. I've found that 16" works well for my PTS design 0-600cfm small bench.