>
>Ok Gang
>
>Here is a practical question. I'm building an amp and have the tube,
>socket, chimney and blower. I'm interested in testing the the airflow of
>the system and have seen a couple of write ups on the test using said
>components along with a cardboard box and manometer. I can obtain a
>cardboard box easily enough but have no idea of where to get a manometer.
>It needs to measure up to at least 2 inches of water and have a resolution
>of .1 inches. I'm all ears or eyes as the case may be.
>
Obtain about 2 feet of clear, polycarbonate tubing at a plastics dealer.
Plug one end. Heat the middle with a 400-deg F heat gun. Blow into the
tubing when the plastic is soft. The pressurized air keeps the tubing
from closing during the next operation. Bend the tubing into a ''U''
while blowing hard. Let cool. Heat and Bend a 90 into one end. Blow
through tubing to make sure it is open. . Attach a long flexible tube to
90ed end. Fasten U to a T stand made of wood. Fill the U about half
way with a mix of water and a drop of food coloring. Measure water
column differential with a hand held ruler. Dump water after making
measurements to prevent algae growth. . Remember, if the tube blows
clean out of the socket, use a smaller blower.
later, Bob
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