Dusty,dusty wrote: ↑Wed Nov 30, 2022 6:58 am No apologies needed. I am stumbling my way through this and I appreciate all inputs.
I understand that a closed system is required to obtain an accurate evaluation and I am approaching that now. By wrapping the one end of a 2 1/2" hose coupler with foam I am able to create a soft pad that couples the meter to the DC. I saw the effects of that with my first preliminary test of this coupler. I achieved readings that were much closer to expectations than any test before.
However, I believe I will never get readings with the anemometer that I have simply because of meter limitations. Even with perfect coupling the meter is incapable of measuring airflow rates that translate to 200cfm. This anemometer is max'd at 5905 ft/minute. If my calculates are correct I need something like 7200 ft/min to measure 200cfm.
I have no way of judging the ability of the DC to produce that rate of air flow.
IF you are getting a max'ed out reading now with your modified dust fitting and your anemometer that is a good thing. That means you are getting at least 165 CFM, but most likely significantly higher. Can you try with more than 1 port open and see if your anemometer stays pegged out or if the reading drops? The original DC-3300 performance drops precipitously when more than 1 port is in use. It would be good to confirm if this is NOT the case with the DC-3300 upgrade.