gas flow sensor
JW Smythe
Posts: 12
G'morning.
I'm looking for a gas flow sensor to attach to my basic stamp.
I'm still playing with that 'run your car on hydrogen' thing. It seems like a neat idea, so why not play, right? Some people play with model trains. Some people build tiny ships in bottles. I play with electricity and explosive gases. [noparse]:)[/noparse]
The HV thing didn't work out for it. It was fun though.
I'm attempting to do what a few companies are claiming works, pulsing the power to an electrolysis rig. Honestly, I see nothing spectacular, but I'm sitting here playing with frequencies and watching the bubbles. My setup has 8 going to a SSR, and 14 going to a LED
HIGH 8
HIGH 14
PAUSE I
LOW 8
LOW 14
PAUSE I/9
AND
FREQOUT 8,2000, I
In the first sample, I've tried I as 1 to 1000. In the second, I've tried I as 1 to 100.
I need some real numbers to associate with the results though, other than "bubbles." The rig can be set up air tight. While I'm playing, it's open to the air, and I'm testing outside so I don't blow myself up. [noparse]:)[/noparse]
I found a thread where someone else had asked for a LP control system, but the last post said he found a place that may have something, and he'd post more later, with no "more" to be found.
Basically, I'd like to close it up air tight, except for a vent with a flow sensor on it. Any ideas for a sensor?
I thought I may use a pressure sensor, but that'll be hard to really evaluate what the box is doing. I'd like to write the program to go through a whole bunch of tests a minute or so long, and just let it run overnight. In the morning, I can go through the results, and see if there is any change at any particular set of values.
I suspect that I can get away with pulsing the power somewhere below hooking it straight up to DC, and lower the power demands of the box. I need to find that magic point, where it uses less power, but doesn't reduce gas flow. Once I know that, I can stuff the box full of electrodes, and see what it can do.
I'm looking for a gas flow sensor to attach to my basic stamp.
I'm still playing with that 'run your car on hydrogen' thing. It seems like a neat idea, so why not play, right? Some people play with model trains. Some people build tiny ships in bottles. I play with electricity and explosive gases. [noparse]:)[/noparse]
The HV thing didn't work out for it. It was fun though.
I'm attempting to do what a few companies are claiming works, pulsing the power to an electrolysis rig. Honestly, I see nothing spectacular, but I'm sitting here playing with frequencies and watching the bubbles. My setup has 8 going to a SSR, and 14 going to a LED
HIGH 8
HIGH 14
PAUSE I
LOW 8
LOW 14
PAUSE I/9
AND
FREQOUT 8,2000, I
In the first sample, I've tried I as 1 to 1000. In the second, I've tried I as 1 to 100.
I need some real numbers to associate with the results though, other than "bubbles." The rig can be set up air tight. While I'm playing, it's open to the air, and I'm testing outside so I don't blow myself up. [noparse]:)[/noparse]
I found a thread where someone else had asked for a LP control system, but the last post said he found a place that may have something, and he'd post more later, with no "more" to be found.
Basically, I'd like to close it up air tight, except for a vent with a flow sensor on it. Any ideas for a sensor?
I thought I may use a pressure sensor, but that'll be hard to really evaluate what the box is doing. I'd like to write the program to go through a whole bunch of tests a minute or so long, and just let it run overnight. In the morning, I can go through the results, and see if there is any change at any particular set of values.
I suspect that I can get away with pulsing the power somewhere below hooking it straight up to DC, and lower the power demands of the box. I need to find that magic point, where it uses less power, but doesn't reduce gas flow. Once I know that, I can stuff the box full of electrodes, and see what it can do.
Comments
It is a thin piezoelectric layer embedded in plastic. If it were inside a tube, the turbulence from the flow of the gas might excite it and provide predictible data.
The biggest dilemma you have is that H2 is both small molecules·and explosive. Leakages and electrical sparks just raise all sorts of questions of safety.
If you were to go shopping for an off the shelf device, I suspect that it would be quite costly due to safety certifications involved.· One alternative is to have the vibration sensor measure the shake in turburlance inside an elbow.· The gas would be completely separate from the electronics.· The elbow would have to be flex mounted and the shake sensor would be on the outside.
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"If you want more fiber, eat the package.· Not enough?· Eat the manual."········
Post Edited (Kramer) : 11/4/2006 4:33:10 PM GMT
I'm not terribly worried about the explosion factor. I'm keeping a safe distance when I'm testing. If it does pop, it'll just give me something else to fiddle with. [noparse]:)[/noparse] The biggest concern would be me waking up to a loud pop outside the house. [noparse]:)[/noparse]
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Dale Bartel
Portland Or
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