Testing o2 sensors at 2bar

Muddweller · 21st October 2006, 19:59

A while ago I considered how I would test the o2 sensors for the cieling effect (ie sensor giving fixed output despite rising ppo2 levels) and since I don't have a mini pot decided to use the exhisting housing.

I dive a mccr atlantis and bought a housing from Martin @ tecme and it has served me well, it also benefits from being able to withstand internal pressure, so I had 2 bungs made, one with an inflater nipple and the other a bleed screw.

So o2 is fed in through the nipple via my cmf valve and the housing is flushed until both sensors stablise at 1.00 +/- .02 ... then the bleed screw is closed and I watch the pressure build on the output of my CMF valve until 0.4bar(above atmospheric) reads on my pressure guage and check the sensors read approx 1.40.

Then I increase to 1bar on the guage and check o2 readings are approx 2bar, I've used it a few times now and the only disadvantage I can see is It tends to use a fare bit of o2 to flush it. (Also discovered my display housing is at ambient and it shouldn't be

) Anyway heres a couple of pics.

Sorry about the quality these energy saving lights are crap for piccies.

BTW I can also flush the loop with argon and seal the house to extend sensor life

jaap · 22nd October 2006, 21:03

My setup:
http://www.rebreatherworld.com/gener...html#post67871

Deepthought_reloaded · 23rd October 2006, 04:44

Quote: (Originally Posted by Muddweller)

... and since I don't have a mini pot ...

Have a look at local car boot / garage sales

readily available and they cost next to nothing and are normally rated to 1 Bar

(Think people also call them pressure cookers and use them for making stews...)

Older ones come with nifty little 15psi (1.02 bar) pressure valve - all you need to do is add a nipple for an air feed...

Muddweller · 29th October 2006, 18:17

Thats very nice JAAP,

The main advantage I see with mine is I'm using the existing housing with sensors in situe and mininal extra components thate are asily set up for field use.

Dis-advantage is housing volume is quite large hence uses more gas to flush it.

How much o2 would you need to flush a pressure cooker

. But could be very usefull for pressure testing housings etc.

Regards
Karl

22nd October 2006, 21:03	#2 (permalink)
jaap Normal people worry me Current Rebreather/s: Classic Kiss Other CCR RB80 / Clone Ray Other SCR Home Build Other Rebreather/s: Other CCR RB80 / Clone Ray Other SCR Home Build Join Date: Jun 2005 Location: Stockholm Sweden Posts: 472	Re: Testing o2 sensors at 2bar My setup: http://www.rebreatherworld.com/gener...html#post67871 __________________ My initials: JAAP
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23rd October 2006, 04:44	#3 (permalink)
Deepthought_reloaded New Member Current Rebreather/s: Azimuth Other Rebreather/s: Azimuth Join Date: Oct 2006 Location: York Posts: 59	Re: Testing o2 sensors at 2bar Quote: (Originally Posted by Muddweller) ... and since I don't have a mini pot ... Have a look at local car boot / garage sales readily available and they cost next to nothing and are normally rated to 1 Bar (Think people also call them pressure cookers and use them for making stews...) Older ones come with nifty little 15psi (1.02 bar) pressure valve - all you need to do is add a nipple for an air feed...
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29th October 2006, 18:17	#4 (permalink)
Muddweller New Member Current Rebreather/s: Dolphin Other Rebreather/s: Dolphin Join Date: Feb 2006 Location: Lancashire, UK Posts: 33	Re: Testing o2 sensors at 2bar Thats very nice JAAP, The main advantage I see with mine is I'm using the existing housing with sensors in situe and mininal extra components thate are asily set up for field use. Dis-advantage is housing volume is quite large hence uses more gas to flush it. How much o2 would you need to flush a pressure cooker . But could be very usefull for pressure testing housings etc. Regards Karl __________________ It'll be reet
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