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Thanks!

It is a uPVC fitting. A 1" unthreaded end cap. https://www.amazon.com/NIBCO-Pipe-Fitting-Schedule-Slip/dp/B007Q2GL08/ref=sr_1_4?keywords=pvc+1+inch+end+cap&qid=1555240837&s=gateway&sr=8-4

That is very i The sensor module is very interesting and looks usable and uses a serial interface; however settling/calibration time is one hour.

It is easily done via software, but I like the simpler/cleaner interface.

Yes Yes. Link please. Pretty please?

No plan for a Trimix analyzer at this time. :-D Maybe some more improvements and making a metered sampler suitable for blending.

It was meant for use at room temp at 1 atmosphere, has an internal heater and needs bump gas to calibrate. It is slow and not really meant to be portable. :-(

Now that is an idea. There is an actual CO sensor called an MQ7. It can be my next project. :-D

The main advantage is auto and 1 button calibration, no more fiddling with a knob. Other advantages are the readability of the OLED in bright light and USB charging. You can also roughly gauge the remaining sensor life at it directly displays the cell voltage. Components are also off the shelf...

GitHub link for the project with code and instructions: ppppaoppp/DIY-Nitrox-Analyzer-04_12_2019 Comments welcome!

Here is an Arduino based Nitrox anlyzer I recently made. It uses an Arduino Nano, an ADS1115 ADC, and a 0.96" I2C OLED display. It uses the PSR-11-39-JD sensor from DGX. This is loosely based on this one: Arduino oled nitrox analyzer - Eunjae Im. But the code was too complex for me, so I decided...

I just skewer the O-ring. Much less chance of scratching the O-ring groove.

Long winded but very informative. Thanks.

THE BIG BLUE is actually about free diving but it is a good movie, nonetheless.

Dry suit?

I do have a DIY pressure pot like that one :-), but my Shearwaters are SA models and do not have the Fischer connectors. I can just chuck in a computer and record the pressure readings manually. But where is the fun in that? I'm planning to add a pressure sensor module and an SD card...

This is getting out of hand. These sensors are actually partial pressure and not absolute sensors. Thoughts are now running in my brain of making a self contained unit with a pressure sensor and a data logging module and chucking it in a pressure pot. :-D

Like how many? I Will 20.9, 32, 50 & 100 suffice? What is their percentage deviation threshold?

I think I can incorporate that into the code. So what is "acceptable" loss of linearity?

I can't seem to find any info on the subject for analyzers, most are recommendation for rebreathers. I am doing a project on an Arduino based O2 analyzer. I would like to know if there is a cutoff voltage value (in air) for the sensor to be considered "bad" and lose its linearity significantly...