I agree with you. For me, they need to be linear in the range I will be using them which is 0.5-1.6. I am happy to dive with sensors that flatten out past 2.0 like sensor 1 in your chart but would replace sensors 2 and 3.
Question O2 sensor calibration
- Thread starter LFMarm
- Start date
Please register or login
Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
- Ability to post and comment on topics and discussions.
- A Free photo gallery to share your dive photos with the world.
- You can make this box go away
I agree with you. For me, they need to be linear in the range I will be using them which is 0.5-1.6. I am happy to dive with sensors that flatten out past 2.0 like sensor 1 in your chart but would replace sensors 2 and 3.
This is the best procedure to figure out what is wrong once you see something is off (see the anecdote from a few weeks ago in a previous post). However I don’t do this as a routine to preserve dilout gas (a proper full flush at significant depth burns not a huge but a noticeable amount of gas) and because it takes a minute to do (again eating into short TTS in serious dives).
mr_v
Contributor
@LFMarm, first of all, I am sorry. Somehow my unedited phrase referring to "basic scuba" got into the final draft of the message. It was uncalled for, even in my sarcastic mood.
Secondly, there is a lot to unpack here based on some of your recent replies.
Whether you check / calibrate daily depends on your personal preference. Many divers calibrate only once per trip. Some manufactures suggest a list of events that should lead to calibration, e.g., sensor replacement, new scrubber pour, change in altitude, change in reference gas. Exercise your best judgement.
Reference gas switches and dill flushes should not take much time or effort. If takes more than 30 seconds to select the best gas to check cell linearity and loop flush, you need to practice more. Your gasses (and your team gasses) should be in your computers. Tanks must have easily visible to you MOD stickers. All mechanical and computer work must be second nature. Gas supplies should always be adequate and on a conservative side, e.g., NSS CDS recommends 1.5x of estimated bailout needs.
If your computers or cells exhibit weird behavior on descend, troubleshoot to your best ability and then turn in the dive. It is unlikely that things will fix themselves or get better at depth. Do not set your controller to 1.5 set point, change cables, etc. There are many other procedures that can get you back safely.
Secondly, there is a lot to unpack here based on some of your recent replies.
Whether you check / calibrate daily depends on your personal preference. Many divers calibrate only once per trip. Some manufactures suggest a list of events that should lead to calibration, e.g., sensor replacement, new scrubber pour, change in altitude, change in reference gas. Exercise your best judgement.
Reference gas switches and dill flushes should not take much time or effort. If takes more than 30 seconds to select the best gas to check cell linearity and loop flush, you need to practice more. Your gasses (and your team gasses) should be in your computers. Tanks must have easily visible to you MOD stickers. All mechanical and computer work must be second nature. Gas supplies should always be adequate and on a conservative side, e.g., NSS CDS recommends 1.5x of estimated bailout needs.
If your computers or cells exhibit weird behavior on descend, troubleshoot to your best ability and then turn in the dive. It is unlikely that things will fix themselves or get better at depth. Do not set your controller to 1.5 set point, change cables, etc. There are many other procedures that can get you back safely.
No hard feelings — sensor calibration is definitely one of the basics for closed circuit.
I do all as you say — all hoses are marked with MOD and doing a flush is probably less then 1 minute. However that may be +10 mins of TTS if done at the bottom. This is why I will start doing the quicker tests by manually adding a little of O2 unless I detect a problem in which case I would definitely test with a dil flush and probably also start ascending.
I do all as you say — all hoses are marked with MOD and doing a flush is probably less then 1 minute. However that may be +10 mins of TTS if done at the bottom. This is why I will start doing the quicker tests by manually adding a little of O2 unless I detect a problem in which case I would definitely test with a dil flush and probably also start ascending.
Similar threads
