Thread subject: Homeroasters.org :: Pressure gauge / Air roaster
Posted by allenb on 05/21/2011 09:27
I lost track of this one. Anyway, what I'm finding is that the most meaningfull reading so far is at the base of the RC, just above the distributor. Obviously, it's a bit warm there.
I used an extension tube to get some distance between the gauge and the heat. It's a bit bouncy.
Further, I think the only way that info will be useful, is if it is tied in with the intake CFM, and perhaps exhaust CFM.
....Still experimenting as time allows. Cheers, -Scott
I've wondered also if measuring at both inlet of the fan/blower and at the high pressure side would yield a more useful reading but would require a meter able to read a differential pressure with two ports. Obviously if there is not a negative pressure at the sensing point at the inlet of the fan then this would be no different than a single input manometer.
Another thing to ponder (as Scott stated above) is if it would be better to read the differential between pre-perf plate and roast chamber which might cause the reading to reflect the change in flow dynamics as the load lightens.
Add a restrictor orifice in the tube to get rid of meter bounce.
Needs some experimentation and I think if we found the right way to read this we could then put the TC4 to work controlling the fan.