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Were you ever able to come up with a solution to water level/resonance problem?
Coffey
Statistics: Posted by coffeyw — Thu Aug 31, 2006 4:17 pm
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If anyone wants to go back and re-read what the reference was about, then they will understand we are not talking about problems with refilling parallel plate designs. The entire description of the drain setup is moot in a single parallel plate cell because that type of cell can be flooded without shorting cells.
Another point is, unless you plan on driving each flooded cell seperately at 2 VDC or less, and building a seperate resonance drive for each of those seperate flooded cells, you will have loads of fun trying to reach resonance, let alone keep it, with a series set of parallel plate design cells.
Bob
Statistics: Posted by Bob Boyce — Thu Aug 31, 2006 3:37 pm
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Bob
Statistics: Posted by Bob Boyce — Thu Aug 31, 2006 1:45 pm
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A narrow overflow gutter could be run high along one side of the series cell at a slight incline and would gather overflow electrolyte, channeling it into a reservoir built onto one end of the series cell. This overflow reservoir would contain the overflow electrolyte at a low liquid level and could be maintained at that low liquid level by an or some other device of your choosing. A small pump could periodically deliver the electrolyte contained in the reservoir to each of the series cells simultaneously, and overflow electrolyte would again run back into the reservoir.
This method is more a brute force method of maintaining the water level, but it's fairly simple. It's like the methods used in hydroponics with timed waterings. Should be able to build this as a part of the structure of the cell itself.
I just can't think of any other design that wouldn't be a grand replication of electronic circuits and other associated hardware.
Coffey
Statistics: Posted by coffeyw — Thu Aug 31, 2006 1:25 pm
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other, a small gap at the bottom should let them fill evenly from
below.
Statistics: Posted by thrival — Wed Aug 30, 2006 10:54 pm
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Bob
Statistics: Posted by Bob Boyce — Wed Aug 30, 2006 9:41 pm
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That sure looks like a terrific device. I guess I have to 'contact them' to get a price on a couple of caps and the rest of the gizmos.
Will let you know how much these things are.
Thanks again!
Statistics: Posted by gas-mechanic — Wed Aug 30, 2006 5:12 pm
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Link to
Coffey
Statistics: Posted by coffeyw — Wed Aug 30, 2006 4:54 pm
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Glad to see you active once again.
I tried the tube with float and magnet trick and had one heck of a time with the floats sticking to the sides after a while. I had to expand the tube size to the point that the float could wander to far away from the reed switch to be reliable before it would stick less. I redesigned and redesigned until I gave up on that. I ended up drilling and tapping some holes in the case at the ends and putting in some #10 T316 level sensor bolts. I o-ringed inside and out, with the bolt threads protruging outside for attachment of sensor leads. What you say about the spark is a very real danger. Because of electrolyte film on the inside surface, you will need to use a high value pull up resistor (I install on the - side of the cell), but you can sense the potential change via a low current transistor or IC, and use the output signal from that to drive a level indicator or other switching system for a refill pump. By using a series of bolts in a vertical coloumn, you can even rig up a driver IC to light up a bar graph level indicator.
I can design a PC board that can function as a safe level sense with DIP switch selectable pump turn on and turn off points, with associated driver circuitry to run a relay for refill pump control. The risks, if built wrong or connected wrong, could be a disaster. This is why I try to refrain from publishing anything like that. I do not want to accept responsibility for mistakes of others causing an accident with injury or death.
Bob
Statistics: Posted by Bob Boyce — Wed Aug 30, 2006 1:21 pm
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Advertising porn links or online dating services or some other spam bullshit... now that is what I'll have a problem with and promptly take action.
A word of caution on water level sensors. Remember that the space immediately above the water is occupied by an extremely combustible gas. Many level sensors work on a voltage system where a circuit is broken when the water level drops below a certain point. When this link breaks there is a small chance of a spark being introduced into the gas environment. I'll let you imagine what happens next. The best idea's I've come up with for level sensing is to put a tube (something like a drinking straw) inside the container. In that tube have something very buoyant that will not be eaten by the electrolyte. On top of that buoyant object have a small but powerful rare earth magnet. They sell many that would work from http://wondermagnet.com
Now on the outside you could rig up a high and low magnet switch (either reed switch or hall effect switch) and link that to a SPST Latching relay mechanism.
This has always been my idea of how to properly automate water levels in the cells. I've just never built that far ...not yet!
Statistics: Posted by Chris — Wed Aug 30, 2006 11:05 am
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