MANOMETER

 

I made this manometer for a visual monitor to let me know if my dust collector filter needed cleaning. A manometer shows a difference is pressure between two points.This shows when there is pressure building up in the air filter as the filter gets plugged up with dust.

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It is very critical where the air tube is sensing the pressure. On my system, the optimum point was at the top center of the filter.

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I used a 3/8” ID clear tube with a ½” pipe thread adapter to install it in the top of the filter. Being able to hold the locknut deep inside the filter could be a challenge. Fortunately a 1 1/16” socket fit perfectly on the ½” locknut to tighten the adapter down.

 

I used a ½” box core router bit to form a groove in a board, to glue the tubing in. I used some colored lamp oil to fill the u-shaped tube so that I wouldn’t have to worry about the liquid evaporating. When the air filter becomes plugged, the air being forced into the filter by the 2 hp blower, puts pressure into the 3/8” tube. This is apparent when the colored lamp oil begins to rise on the left side. Cleaning the filter will balance the oil level back down.

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