Fluid Mechanics - keeping water level constant

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daisy11
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Hello all,I am trying to construct this setup here:
Schematic of a humidity generator: dry air enters through a flow meter into an evaporation chamber over a heating tape, linked to a water reservoir, with a humidity sensor and process controller.


Don't mind the heat tape and microcontroller. I am concerned with the fluid dynamics of the system.

When compressed air is applied, the water level in the evaporation chamber increase until it overflows into the tube that is exposed to atmospheric air. The reservoir chamber is obviously much larger than the heating column. I have a T-connector in place between the dry air and the evaporation chamber that splits off the incoming air into the evaporation chamber and reservoir as well.

This was a successfully proven system, but I am thinking that my T-connector is not distributing the compressed air into the 2 glassware evenly. The top of the evaporation chamber is sealed around the appropriate inlet/outlet tubes...what do you guys think?

EDIT: I have found that by switching around the connections on the T-connector, the water levels in the evaporation chamber rise and fall depending on the setup...this looks like to be the fault...does anyone agree?
 
There's no T in the diagram. Maybe that's your problem?