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We have designed three different lever systems with the current design presented here. (Please label the figure and what you are showing in each.)**Harry can you work on this section? Label components and describe each item in detail. Actually, I think we have an update version that shows the eye-bolts. Let me know when you are working on this and I will email it to you.
Components
Lever Arm
The lever arm is a 1" x 1" aluminum bar classified by the 80/20 Inc. as 1010. The length of the lever arm was decided to be 0.80 meters to account for the variation in the water level of the entrance tank from the overall head loss in the plant. The lever arm is attached on the top with components from McMaster Carr so that the slide can slide to zero and have a manual shutoff.
Slide
The slide is a component from 80/20 Inc. that we attach the orifices to. There is also a hand brake that is attached.
Brake
The brake keeps the slide in place, also a component from 80/20 Inc.
Float and Counter-Weight Connectors
The connectors are eyebolts that are screwed into the ends of the lever arm. The float and counter-weight are attached to these eyebolts by fishing line.
Stock Tank
The stock tank will sit on the triangular table that is pictured.
Constant Head Tank
The constant head tank is maintained on this makeshift platform that will place the tank at the same level as the lever arm.
There are a number of constraints in the design of this lever arm. First, we need to facilitate a way to attach the floats and counter-weight. Secondly, we must have a way to adjust the distance the orifice travels down the arm. It was also requested that the operators be given a means to manually "shut off" the flow. This can be accomplished by moving the orifice directly in line with the pivot. We have also attempted to accommodate a second slide to facilitate attaching a second dosing pH control system. It is preferred that both slides operate on the same side of the lever to allow the operator easier access.
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