calibrating on multiple days diving

[lermontov]

wondering how often folks calibrate on a dive trip when you dive daily and your using the same 02 source (a J or G size cylinder)

 

[rjack321]

assemble the unit for the day
fill with o2
still reading 0.99? no need to calibrate

NOT reading 0.98-0.99 then investigate why. Don't just blindly recalibrate and potentially mask a real problem.

 

[beldridg]

assemble the unit for the day
fill with o2
still reading 0.99? no need to calibrate

NOT reading 0.98-0.99 then investigate why. Don't just blindly recalibrate and potentially mask a real problem.

Yep, basically the same.

- brett

 

[Jona Silverstein]

You should only need to calibrate a few times a year. take notes and a log of your cells and mv readings at certain PPO2 levels to check for sensor decay.

 

[grantctobin]

You should only need to calibrate a few times a year. take notes and a log of your cells and mv readings at certain PPO2 levels to check for sensor decay.

Define a “few”?

 

[tbone1004]

Define a “few”?

I went from Thanksgiving 2020 until March of 2021 before I had to recalibrate, about 100 hours and then I was only getting about 0.95 on the O2 cal, so it was time.

 

[Jack Hammer]

You should only need to calibrate a few times a year. take notes and a log of your cells and mv readings at certain PPO2 levels to check for sensor decay.

Or you could just calibrate in air and match it to O2. (JJ-CCR, calibration is super fast and simple)

 

[lermontov]

I went from Thanksgiving 2020 until March of 2021 before I had to recalibrate, about 100 hours and then I was only getting about 0.95 on the O2 cal, so it was time.

i thought the point of calibrating was to check/match the supply 02 to your cells especially from one site to another and to monitor degradation

 

[tbone1004]

Or you could just calibrate in air and match it to O2. (JJ-CCR, calibration is super fast and simple)

NEVER calibrate a rebreather in air unless it has multi-point calibration like the old megs. If you calibrate in air you run a serious risk of oxtox due to linear deviation.

i thought the point of calibrating was to check/match the supply 02 to your cells especially from one site to another and to monitor degradation

You validate calibration, but you only calibrate when it no longer matches a known source. If I O2 flush and it's between 0.98 and 1.02 I consider it "good enough" and don't bother calibrating

 

[rjack321]

You validate calibration, but you only calibrate when it no longer matches a known source. If I O2 flush and it's between 0.98 and 1.02 I consider it "good enough" and don't bother calibrating

It's one button on most units (the 2.7meg being a notable exception). I dont get the months at a time avoidance.

My cells move back and forth between 2 units and I always recalibrate if they move.