I'm in the process of automating my new 55 gal RIMS brewrig.
I had the misfortune to have my brand new Blichmann false bottom, sucked ball shaped by my pump. :-(
I order to avoid that, i have installed to small sight glasses on the MT, made of 850mm x 8mm ID glas pipes. One with input below the, now straight again, false bottom and the other just above. Now it's at least visual if the pressure is different below or above the false bottom. :-)
Then i got the idea to use a differential pressure sensor, to automate the recirculation.
...and then, why not use the measured pressure to determine how much liquid i have in my kettles?
Well, now i need help. I have absolutely no idea, how to calculate, the minimum and maximum pressure i could expect in the sight glasses/pipes.
For now the pipes are open in the top, but here must the pressure sensor be connected air tight.
So, do you think it will work?
Can you help me with a formula / spreadsheet to calculate the possible pressure levels in the pipes/sight glasses?
Do you thing that this cheap differental pressure sensor can work: http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MPXx10&fsrch=1&sr=1
The sensor will feed an input port on a Siemens Logo! analog port i use to control the process.