Case for a Passive Oxygen Analyser

prusaprinters

<p>This is a case to build your own passive oxygen analyser with sensor cells retired from your rebreather.</p><p>Considering the low resolution of the analogue readout this is obviously not suited for analysing gas mixes that you plan to use for diving, but it makes for a good discussion piece, or for instructions, as it nicely illustrates the fact that sensor cells are actually producing power. And if you own a rebreather you'll never be short on discarded sensor cells. ;-)</p><p>The schematic is simple, and the parts (except for the sensor cell) can be purchased for cheap from most electronics parts stores.</p><p>One thing to be aware is that, for most cells used in rebreathers, you will have to disconnect the calibration resistor network that is inside the back cap of the cell - it is up to you to figure out how to do this for your cells without destroying them. If you don't do this the current available on the terminals will not be enough to drive the 100uA meter.</p><p>Once wired up, with the cell in air, set the knob on the potentiometer to about mid way, and then adjust the trim potentiometer until the dial shows approximately 21 uA - this is your oxygen percentage. Use the potentiometer to fine-tune, and re-calibrate after changing the cell.</p><p>Category: Sport &amp; Outdoors</p>