I have emailed Miso for the nominal set points on the sensor in the LS3. I have had one for about 18 months and LOVE it. As I recall, Miso told me at one time that it takes a 10% reduction in internal pressure to turn on the green light. I'll confirm that, but:
Assume the housing is at 15 psia (that's absolute). Then the green light comes on at 13.5 psia with the removal of 10% of the volume inside the housing. 10% of the volume of the housing is a lot of water, at least for my Aquatica with the dome port installed. So to get the red light to come on, you need a portion of the 10% in water volume to be introduced into the housing. So, IMO the LS3 (or any other vacuum system) isn't going to help much in dealing with a leak that starts after you're underwater. It's main value is to insure that the system is secure before getting in and, to a much less extent, during the first few feet of descent before the outside pressure firmly seats everything.
BTW I still have my electronic leak detector installed in my housing. That will tell me as soon as any water is introduced into the housing-long before the pressure increases to trip the red light. That may save the internals. As both perform different functions, having both methods gives me max chance of avoiding a flood.
I'll post an update once I hear from Miso,.
- denniscloutier likes this