TDI Helitrox I believeding ding, and I know quite a few instructors that incorporate something like TDI's Advanced Recreational Trimix into their courses for that reason
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
TDI Helitrox I believeding ding, and I know quite a few instructors that incorporate something like TDI's Advanced Recreational Trimix into their courses for that reason
Interesting, but I guess I should have expected something like this from an agency that will give you a normoxic dil card and after a certain number of hours graduate to a hypoxic dil card without even seeing the instructor again. Seems rather idiotic to take a brand new CCR diver and having them doing deco when their mid-water shallow stop capability is never going to be strong. Blow a bag and hang I suppose
That might be the case but I did Air Dil Deco and after a bit of experience Mixed gas. So there is no difference in price from doing so or doing helitrox and then mixed gas. I think.They do that so you can give them more money. That's the only reason. Many instructors will train you to helitrox first.
That might be the case but I did Air Dil Deco and after a bit of experience Mixed gas. So there is no difference in price from doing so or doing helitrox and then mixed gas. I think.
Cheers
I think you need to reread who this course is for......it clearly has 2 distinct groups of people that this course is for. Your interpretation tries to couple them together. The "prerequisites" are where it defines what you must do in order to qualify....not the "who this course is for" section....If you look in 'who this course is for' it clearly states that you have to be a "TDI Air Diluent Diver" to do this. Then you have to meet the course pre requisites.
I was hipoxyc trimix in OC and I was made first air diluent deco diver, I was allowed into helitrox/mix d gas only after 35 hours of air dil.
So TDI does not allow nn rebreather divers to start with helium. At least according to what I read here and what my TDI instructor told me ....
Cheers
Please show me where in TDI's standards that is permitted.Interesting, but I guess I should have expected something like this from an agency that will give you a normoxic dil card and after a certain number of hours graduate to a hypoxic dil card without even seeing the instructor again. Seems rather idiotic to take a brand new CCR diver and having them doing deco when their mid-water shallow stop capability is never going to be strong. Blow a bag and hang I suppose
From what I understand, voting logic finds the two cells that are most alike and then averages them, ignoring the cell that is must unlike the other two.
very likely to effect the other cells in the rebreather which are usually nearby, subjected to the same environment,
have similar ages,
You get some dampness in your loop that makes one cell report a tenth of an ATM lower, it is likely at least one other cell will also be effected.
In addition, voting logic always assumes that one cell is broken.
It doesn't assume that NO cells are broken. It doesn't assume that two are broken. It won't assume that all the cells are broken. It always assumes that exactly one cell is broken.
One cell can provide readings to the diver and drive the main O2 addition solenoid, while the other can get validated periodically during the dive by the electronics by using two other solenoids to blow tiny gusts of O2 and known composition
basically if the cells ever say two significantly different things, or the voltage linearity of the secondary cell is not confirmed,
So, is there something I am missing? How did voting logic become so popular among eCCR users and manufacturers?
Because it works. It works for diving, it works for aviation,it works for industrial controllers. Its not a perfect method but with good physical design the method quite simply has proven itself safe and effective.
Its not perfect by any more but it works and has a large amount of usage data showing it works.