48 Hour Lockout?

[KevinA]

I've heard about some dive computers having a 48 hour lock-out period if a diver violates a NDL limit. What is the reasoning behind 48 hours? According to all the dive tables, after 24 hours the N2 de-saturation should be complete. Is the additional 24 hours some sort of "punishment" time, or is it based on something else?

 

[Capt Jim Wyatt]

The short answers is "Lawyers".

 

[Oldbear]

The short answers is "Lawyers".

The long answer probably has a Lawyer's influence as well.

 

[victorzamora]

The long answer probably has a Lawyer's influence as well.

......and is written in fluent Legalese.

 

[redacted]

Violating NDLs raises the risk of DCS to an unacceptable level. DCS symptoms may take 24 hours or more to occur.

 

[jcaplins]

For clarification, I don't believe a computer will lock you out for exceeding the NDL, but locks you out if you do not follow the decompression stop instructions after NDL is exceeded.

So if you do not do the proper decompression stops then you are in high risk territory for DCS. And as AWAP pointed out, It may take longer than 24 hours to shows signs of DCS.

 

[Scared Silly]

I've heard about some dive computers having a 48 hour lock-out period if a diver violates a NDL limit. What is the reasoning behind 48 hours? According to all the dive tables, after 24 hours the N2 de-saturation should be complete. Is the additional 24 hours some sort of "punishment" time, or is it based on something else?

As you observed after 24 hours the desat should be but may not be complete. Thus the 48 hours gets one to the point of will be complete. People off gas differently. So in the case of decompression violation, one has to assume the worst case. Then let the lawyers take over.

 

[diver 85]

'They' wanting you to (have to) buy a 2nd one so you can resume normal diving after day 1.....

 

[dmoore19]

If "they" didn't get sued by everybody and their dog for people doing stupid things "they" wouldn't have to make their equipment do what it does.

 

[AJ]

Or buy a real (tech like Petrel) computer