Buy a canary. Seal the bird and cage in a large trash bag, and feed your mix into it. If the bird keels over after breathing your mix, there is not enough O2 in it. This also works with cats, if you can get them into the trash bag.
"Have you ever noticed
When you're feeling really good
There's always a pigeon
That'll come shiat on your hood?" John Prine 4-7-2020
"Into the blue again; in the silent water
Under the rocks, and stones; there is water underground" Talking Heads
You can always get them into a trash bag. Keeping them in there is pretty tough, though.Originally Posted by OFG-1
My son found out that trying to put a cat in a running shower is a really bad idea....
Bob K
Dave-
These were errors provided back to a customer.
The first item seems like something that you encountered.
In the future I would immediately talk to the vendor about returning the cell.
S/N: 50901742 = I removed the sensor from it's housing and removed the PCB from the sensors. I discovered some small crystals had formed on the anode. The crystals have bridged from the anode to the cathode flag. This caused a drop in output causing the sensors to go out of it's standard spec of 8.5 - 13 mV. The crystals are usually caused by contamination. We do have a proprietary cleaning technique we use to clean all of our lead anodes for all of our oxygen sensors. But nothing is foolproof, apparently in this instance we didn't catch all of the contaminance and some crystals were able to be formed.
S/N: 50901743 = This sensor had a 0.0 mV output. I removed the sensor from the housing and the PCB from the sensor. The Positive lead from the sensor to the PCB was broken causing the sensor to read 0.0 mV. I don't have an explanation why the wire is broken or how it got broken. All of our sensor are tested a minimum of 3 times before they are ready to ship. I am sorry that I don't have a better answer for you on this one.
I have recently seen some interesting comments- But I am trying to get permission to post the comments- so I don’t get my head ripped off for cross posting.
More to follow.
Separate topic- YEAH I would be interested in a Helium Hackers guide.
Andrew
Re: build it yourself O2 analyzers
I have found some microbridge mass flow sensors for about $90 or so. I think all that really needs to be done is to regulator the flow of gas into the sensor, probably with a cheap regulator, and then calibrate it's output for different %s of He. Kind of a simple microcontroller deal with a cal table.
The cal could even be semi-automatic.
I might play with this this winter.
Bob K
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