Imran, can you measure the amp draw with all gates open and compare that to the cfm reading ?? Then close various gates or partially and match the amp draw with the new cfm readings to get a rough fan curve.? Down the road you can compare amp readings and plot
them against your prior curve to see how the filter affects the cfm.? Dave
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Does anyone have an idea how much CFM will be reduced when new filter gets dirty? I have few days to return the anemometer and don't have much planned work.
I am curious what the collective thinks about making just a comparative readings with partially closed gates. Just looking for a solution to determine the status of the filter in future.
BTW, I failed to report that the light (for difference in pressure) never turned off with new filter installed. I may have to open the sensor like someone else did here.
Finally, Bill is correct, the differential pressure sensor compares negative pressure below the filter (dirty side) with ambient.
Imran
