Flat glass drop checker - The Planted Tank Forum
 
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post #1 of 3 (permalink) Old 01-05-2012, 10:58 PM Thread Starter
Algae Grower
 
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Flat glass drop checker

So I've built a DIY CO2 system, including an active reactor for diffusion, and recently stumbled onto the use of a "drop checker" to monitor the concentration of dissolved gas....

One of the (many ) previous hobbies I've dabbled in was stained glass, which meant I had a box glass scraps sitting in the basement, and some reasonably decent cutting tools. So I built my first drop checker last night!



The dimensions are 3" by 2", with a 0.25" cavity. (0.125" glass), and it holds about 2.5 mL of indicator. The benefits are that the translucent white background is backlit by the tank lights, which allows easy reading, and the tank/air and air/indicator boundaries are both large compared to most checkers, and are nearly equal in area. I haven't done the math, but I suspect the surface area to indicator volume ratio is larger than most other checkers as well.

Other than the sloppy silicone work, I'm quite pleased.


grnbrg.

Last edited by grnbrg; 01-06-2012 at 02:53 PM.
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post #2 of 3 (permalink) Old 01-05-2012, 11:51 PM
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I find this very interesting. Am I correct that the bottom edge is open to the tank, forming the air cavity, and that the indicator fluid is sitting on a kind of shelf made of slips of glass sandwiched between the front and back?

I don't think I'd want to try it myself with glass, though I understand why you went that route, but maybe acrylic .... must think on this.
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post #3 of 3 (permalink) Old 01-07-2012, 03:11 AM Thread Starter
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Quote:
Originally Posted by NatCh View Post
I find this very interesting. Am I correct that the bottom edge is open to the tank, forming the air cavity, and that the indicator fluid is sitting on a kind of shelf made of slips of glass sandwiched between the front and back?

I don't think I'd want to try it myself with glass, though I understand why you went that route, but maybe acrylic .... must think on this.
Yup, exactly right. I think if I make another one, I will reduce the height to 1" or so, and drop the "reservoir" on the left -- I don't think it's needed, and just adds complexity.

I also should have waited more that ~20 hours before adding the indicator and dropping it in -- I think the silicone is still off-gassing, and affecting the measurement. We'll see how it goes....



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