O2 Analyzers

[HowardE]

I have the QuickStick and am not really sure about the accuracy. I analyze my tanks at the shop after I get them filled and when I do it with the quick stick I never come up with the same results. Usually not way off, but enough for me to question it. It could also be operator error since the instructions are somewhat vague.

You also have to remember to adjust for temperature and humidity in the air sample that you use. If you calibrate off of a tank of known 21%, then you are fine, but if you use ambient air that is say 80 degrees with 80% humidity, then you need to adjust your calibration down to around 20.3% (there is a table in the manual).

I also use the quickstick from nuvair. I also have access to the OMS, Analox, and a few others. The quickstick is durable and simple. Continuously calibrating an analyzer (if used regularly) shouldn't be necessary.

Also, all analyzers need to be adjusted for temperature and humidity. The PO2 of air is variable with the air pressure and temperature, so of course you have to adjust for that in your calibration.

One other thing is... how do you know the "known tank of 21%" is exactly 21%? It's probably not. Most air is not 21%, but a tenth or two below 21%, as the humidity, temperature, etc are also factors when you fill the tanks.

As far as the quickstick goes. I think for the price, it's great. It always reads within a few tenths of any other analyzer. I've had mine for 3 years, and it still is accurate, and the cell is still good.

 

[parzdiver]

Has anyone ever modified an Analox O2EII to connect to a LPI? I have the Analox, but would prefer to use it with a flow restrictor connected to LPI for the reasons DA Aquamaster lists above.

It could be as easy as modifying the "dome" and running the tube from there to the flow restrictor/LPI connector.

 

[HenrikBP]

My LDS uses a pair of those as the verification unit when you pick up your tanks. I do not care for the shown attachment, rather prefer the LP quick disconnect option.... other than that, it seems dependable.

The Maxtec analyzer linked comes with both the "knob" and the LP inflator connector. You may have to buy the LP connection bit/flow restrictor separate - that way you get one that fits *your* inflator hose

 

[NAM001]

i bought an " el cheapo" from oxycheck and have used it for years. just buy the 10 turn pot with it

 

[nimoh]

i bought an " el cheapo" from oxycheck and have used it for years. just buy the 10 turn pot with it

what is the 10 turn pot?

 

[parzdiver]

what is the 10 turn pot?

It is a replacement for the standard potentiometer that is provided with the kit and allows for easier calibration.

 

[NAM001]

there is a calibration sdjustment on an o2 detector. the one that comes with the kit is at most a 1 turn pot. when you put the sensor in the air you turn the pot or adjustment knob to read 20.9. it is now calibrated to sample you tank gas. theslightest movement can make the readout change 3,4 5 percent. the 10 turn poot is less sensitive and takes 10 turns to do what the one turn does, so bumping with you finger while sampling breathing gas introduces less error. bumbp the 1 turm pot and you can make it read 1% off. the 10 turn pot bumping it will ma=ke it 1/10 % off. insures a more accurate reading wnce calibrated.

 

[TomZ]

Has anyone ever modified an Analox O2EII to connect to a LPI? I have the Analox, but would prefer to use it with a flow restrictor connected to LPI for the reasons DA Aquamaster lists above.

It could be as easy as modifying the "dome" and running the tube from there to the flow restrictor/LPI connector.

No modification needed. The aerosol "straw" that came with my Analox CO bump test gas fits inside the Oxycheq restrictor, and into the tester dome. I believe it's a common 'straw" like you get with WD-40. The Analox O2 and CO analyzers have the same dome. The hole in the domes are stepped down, so there's no chance of poking the sensor. Easy as pie.

 

[Wolfie]

Current price for the kit is $110:

EL Cheapo II Analyzer Kit : OxyCheq - DiveOps, Analyzers and Scuba Diving Equipment

The Expedition sensor cap is another $20, $40 with the flow restrictor and QD fitting - not a must have but nice - and the sensor saver is $4.50. The cost of the dry box is $25-$30. So for $150 you get a very functional and easy to use analyzer and for another $30-$35 you get all the perks. At $185 it will still be a lot less than an comparable analyzer costing $300 or more.

as I am a tinkerer at heart I think I may be leaning this way. There are no pics on the oxycheq site. Could someone post a picture of a completed one?

 

[NAM001]

HERE IT IS...... EL Cheapo II Analyzer Kit Review - YouTube

as I am a tinkerer at heart I think I may be leaning this way. There are no pics on the oxycheq site. Could someone post a picture of a completed one?