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A series of connectors are required to switch between ¼" and ½" tubing and fittings. A ½" pressure break tee is used, with two reducer stems (1/2" to 3/8" and 3/8" to ¼"). At the bottom of the ½" tube a ½" to 3/8" reducing union and a 3/8" to ¼" reducer stem are used to connect tubing.
The ½" pressure break tee is also used to attach the dosing tube system to the lever arm. A dosing ring (loop that can be made from any type of fairly rigid wire) is threaded through small holes drilled through the open top of the tee. The ring should be designed so that it fits into the lever arm notches well without slipping out because it will be the only thing used to set the dosing tube position.
Float assembly
The main factors governing float assembly are diameter of the float and its center of mass. The minimum outer diameter for a float being used with this chemical dosing tube system is 6.3 inches. This is designed to give no greater than 5 mm of variation in float height as the dosing tube system is moved toward and away from the pivot across the entire range of plant flow rates. The height of the float is not designed for quantitatively, but the following conditions must be met:
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