My Nitrox Stick

[mstrty]

Just sharing my stick with you all. The 2" mixer was found on amazon. The o2 sensors are from divegearexpress the rest was home depot. Under $250 bucks.
Filled my cascade tanks to 32%. Took 1 1/2 K bottles @2000 psi of o2 to fill 4 E9421-4500 tanks to 4500 EAN32. 1 sensor on the stick the other on a leaking HP fill port.
I have enjoyed this build and look forward to where it takes me next.

 

[Tracy]

3% is a pretty big drop across the stick. Did you calibrate the inlet sensor with the compressor running?
In the end, the accuracy of the sensor doesn't matter at all as long as it has good precision and you are consisten with 3%. But that large of a drop does tell me either the stick isn't mixing completely, your inlet sensor isn't in the best location, or it wasn't calibrated in moving air.

 

[mstrty]

3% is a pretty big drop across the stick. Did you calibrate the inlet sensor with the compressor running?
In the end, the accuracy of the sensor doesn't matter at all as long as it has good precision and you are consisten with 3%. But that large of a drop does tell me either the stick isn't mixing completely, your inlet sensor isn't in the best location, or it wasn't calibrated in moving air.

None of the above. I simply turned up the o2 seconds before i snapped that photo. I was finishing the fill and wanted to increase the final o2 content in the cascade. When running 99% of the input o2 versus the output o2 was within 1%. On my system it takes about 90 seconds before the air going into the compressor and through the filter stack reaches the output fill whip. No worries good eye.

 

[rx7diver]

Just sharing ...

I can't tell for sure from the pic, but it looks like you've plumbed through your garage ceiling and are drawing fresh air in from outside, from above your garage roof. Is this correct?

rx7diver

 

[Tracy]

None of the above. I simply turned up the o2 seconds before i snapped that photo. I was finishing the fill and wanted to increase the final o2 content in the cascade. When running 99% of the input o2 versus the output o2 was within 1%. On my system it takes about 90 seconds before the air going into the compressor and through the filter stack reaches the output fill whip. No worries good eye.

Perfect.
.5% is about the best I have ever seen a stick operate. 1% is still excellent. Your internal spiral mixer is doing a good job.

 

[happy-diver]

Brilliant an absolute work of art, right colour too, and it works

Hey do you think you can build one for someone that's sometimes a bit dumb like me

 

[mstrty]

I can't tell for sure from the pic, but it looks like you've plumbed through your garage ceiling and are drawing fresh air in from outside, from above your garage roof. Is this correct?

rx7diver

No I just have a filter at the top of the stick to keep the bugs out.

Hey do you think you can build one for someone that's sometimes a bit dumb like me

Um? No! It was a fun project. But not that fun.....