I picked up a flow meter on ebay that has a sensor and display, but am wondering if some of the programer savy BCS users could help figure out how to integrate this in to the BCS interface. I found aplace where I can get just the meter for $20 each. If posable It would be nice to link these up to control some Automatic valves to control water from the HLT to the mash,wort to the kettle, and wort from the kettle to the fermenter.
These are pulse meters with hall effect sensors. You have to count the pulses to know the volume of flow. Additionally, the lowest flow range is 1.5L per minute and you will likely need to flow slower than this for some processes (sparging in particular). These are also only rated for 80C (176F) temperatures, so you are near the upper end of them when sparging and way over their limit with boiling wort.
About the only thing I could see these being used for is filling your MLT & HLT with the initial water (higher flow & within temp range). I might get one of these for this purpose. I'll have to program a separate micro controller to utilize it though.
Go to the bottom of the page, it is only rated to 60ºC though.
I was thinking that the one off the kettle would be after my CFC. On good point you make is it might not work for sparging with the 1.5L/min lower limit.