Oxygen Sensor Fundamentals

[LFMarm]

Very true. This is why I started to periodically test sensors across the whole pO2 range.

 

[mr_v]

@LFMarm - why periodically? Do you not do an O2 flush at 20' when ascending from a dive?

 

[LFMarm]

I test them before diving if I have not dived for 4+ weeks. Last year I found a couple of non linear sensors before their expiration date and since then I never dive with sensors that I have not recently tested for linearity.

 

[Johnoly]

Last year I found a couple of non linear sensors before their expiration date..............tested for linearity.

I'm not a RB diver,,but just curious. Have you ever found a new, fresh out of the package sensor with questionable linearity. I've had a brand new LP hose leak at the crimp and new SMB's that wouldn't hold air.

 

[tbone1004]

I'm not a RB diver,,but just curious. Have you ever found a new, fresh out of the package sensor with questionable linearity. I've had a brand new LP hose leak at the crimp and new SMB's that wouldn't hold air.

It's not unheard of for them to be bad. They are effectively a battery, so it's always possible something went wonky. O2 cells aren't morning people though, they need to hit snooze a couple of times and have their morning coffee, then breakfast in bed, then they may decide to join the land of the living. It's generally best to give them close to 24 hours to really "wake up" before you try to use them if at all possible.

 

[rddvet]

I'm not a RB diver,,but just curious. Have you ever found a new, fresh out of the package sensor with questionable linearity. I've had a brand new LP hose leak at the crimp and new SMB's that wouldn't hold air.

Yes. All of them were the ****-y ones that Oxycheq sells. (AST brand). 4 of them from varying lots and production dates actually. I'm pretty sure a few other people had issues too. They're ****-y enough that they replace them no questions asked. Problem is some of them were the replacements. I tossed them all in the trash and chalked it up to a learning experience (and that lesson was AST cells are the ****-iest on the market).

 

[rddvet]

@LFMarm - why periodically? Do you not do an O2 flush at 20' when ascending from a dive?

I don't every dive

 

[Para Goon]

Very true. This is why I started to periodically test sensors across the whole pO2 range.

@LFMarm - How are you testing the o2 sensors (i.e., do you have a DIY tester)?

 

[LFMarm]

@LFMarm - How are you testing the o2 sensors (i.e., do you have a DIY tester)?

Yes, I built one following advices on the forum

 

[LFMarm]

I'm not a RB diver,,but just curious. Have you ever found a new, fresh out of the package sensor with questionable linearity. I've had a brand new LP hose leak at the crimp and new SMB's that wouldn't hold air.

Yes, only once. This was before I had my tester but it was so off that could be easily spotted even during calibration.