Which Helium analyzer?

JLW

JLW

Member
I am undecided between the Analox at 500 quid and the Vandagraph at 700. I know the Vandagraph is good as I have used it lots, my question, is it 200 quid (GBP) better than the Analox? Divesoft is not on my list as the ones I know of over here are not accurate.
Thanks.
Jon
 
JLW said:
Divesoft is not on my list as the ones I know of over here are not accurate.
Thanks.
Jon
Click to expand...
We are using Divesoft with our divegroup and at least for us it seems to be very accurate.
Have you made the 3 point calibration for the analyzer?
 
Hi Jon

I have used the Analox ATA for over 3 years and it's accuracy is comparable to all the other Helium Analysers we use.

Uwe
 
JLW said:
I am undecided between the Analox at 500 quid and the Vandagraph at 700. I know the Vandagraph is good as I have used it lots, my question, is it 200 quid (GBP) better than the Analox? Divesoft is not on my list as the ones I know of over here are not accurate.
Thanks.
Jon
Click to expand...

I have the TAI Mixchek. Easy to use, had it 10 years, changed the cell once. Gives 2 numbers - O2 and He, could not be simpler to use as it comes with the restrictor.

http://www.teledyne-ai.com/products/mixchek.asp

Matt.
 
Has anyone ever wondered why these analyzers don't have a CO tester on them? I mean if we are measuring oxygen and helium why not add a CO monitor?

If one comes out I think people would buy them.


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Garth said:
Has anyone ever wondered why these analyzers don't have a CO tester on them? I mean if we are measuring oxygen and helium why not add a CO monitor?

If one comes out I think people would buy them.


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Are they hard to make?
 
Divesoft may, in my little experience, be tricky using on a boat that has the engine(s) running due to the fact that it's method of measuring is based on sound. Never had any such problems with my Analox though.

Just a thought if you think it matters...

/nils
 
Garth said:
Has anyone ever wondered why these analyzers don't have a CO tester on them? I mean if we are measuring oxygen and helium why not add a CO monitor?

If one comes out I think people would buy them.


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Click to expand...

Its not hard, but some of us don't like having all-in-one analyzers since when one part craps out (batteries or otherwise) the whole thing is often dead. The C squared units (for instance) are all modular and take AAA batteries. Simple.

I have one of the old atomox helium analyzers, still works fine although the internal battery died years ago. I have to plug it into the wall. That's not really an issue since I analyze at home before packing my truck/gear. When I go remote and I'm refilling in the bush I don't bother analyzing helium anymore. I could but would need to plug the analyzer into the generator.
 
Using my own DIY He analyzer ;).

I believe there would not be any problem in having all in one analyzers -O2, He and CO. Problem is comercial producers would make you pay too much for them. The technology is not that problematic. What you need is sensor, microcontroller and display (if not touchscreen than some buttons too). Sure some knowledge on programming and math too..

Igor P

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Last edited:
Igor P said:
Using my own DIY He analyzer ;).

I believe there would not be any problem in having all in one analyzers -O2, He and CO. Problem is comercial producers would make you pay too much for them. The technology is not that problematic. What you need is sensor, microcontroller and display (if not touchscreen than some buttons too). Sure some knowledge on programming and math too..

Igor P



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Click to expand...

But you are a smart man Igor.
ps. still haven't replaced mine.
 
rjack said:
Its not hard, but some of us don't like having all-in-one analyzers since when one part craps out (batteries or otherwise) the whole thing is often dead. The C squared units (for instance) are all modular and take AAA batteries. Simple.

I have one of the old atomox helium analyzers, still works fine although the internal battery died years ago. I have to plug it into the wall. That's not really an issue since I analyze at home before packing my truck/gear. When I go remote and I'm refilling in the bush I don't bother analyzing helium anymore. I could but would need to plug the analyzer into the generator.
Click to expand...

This is a great point. You wouldn't want to have one part of the machine crap out and ruin the whole thing. I wasn't thinking about that.

For the C-squared.. is there a replaceable cell or something?

I really would like to start analyzing for CO. I currently don't. I buy from reputable folks and locally use a guy who has an analyzer inline. He also sends off his gases twice a year to analyze for CO in the lab.

Great discussion here guys

Thanks,
Garth
 
CO sensors are a significant fraction of the cost of the analyzer so replacing one may or may not make sense depending on the unit price and availability of parts. They last 3+ yrs. Longer than O2 sensors but not as long as many helium cells.
 
I have gone for the Vandagraph in the end. I trust it and can get some degree of support in Africa. (And I know it)
 
Hello,

FYI: There are some He/O2 analyzers with CO already on the market: The DE-OX Multigas can be ordered with different configurations: O2, He, CO, CO2, Temp, Moisture etc. The O2, HE and CO Multigas is one or their standard configurations...
 
One more (slightly late) +1 for the Divesoft. I've had one for just under 2 years and had no problems with it, on boats, near a running compressor or anywhere else. The only downside is the battery doesn't last long so it's best to use the power connection where possible.

There is a feature on the Divesoft where if the outputs from the O2 sensor and He results don't add up it reads 'foul air', I've not had this problem yet but the likely cause being CO this could be a good in-between option rather than a dedicated CO sensor.
 
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