submersible IP gauge

[wedivebc]

Anyone know of a sealed 1ata pressure gauge I could use to measure IP of a reg underwater?

 

[Bobby]

Why would you want to you can't adjust it under water. By the time you are there it is what it is. I would imagine that you can put any IP gauge on an IP hose and take it down with you.

 

[wedivebc]

Why would you want to you can't adjust it under water. By the time you are there it is what it is. I would imagine that you can put any IP gauge on an IP hose and take it down with you.

I am trying to diagnose a fault with a CMF MCCR rebreather. An normal IP gauge is vented to ambient pressure so it will not work.

 

[Tom Winters]

Wedive - if you're adjusting and tuning your regs underwater, you de man!

 

[scubatoys]

We have a 3/8 to 11/16 adapter... Folks with very old regs that have 3/8 HP ports need them if they want to put on a new HP hose... So you could grab one of these, then put something like a AI computer in your LP port... If that is accurate enough for what you are doing. The adapters are only about 10 bucks - probably a lot cheaper than any gauge you could find.

 

[wedivebc]

We have a 3/8 to 11/16 adapter... Folks with very old regs that have 3/8 HP ports need them if they want to put on a new HP hose... So you could grab one of these, then put something like a AI computer in your LP port... If that is accurate enough for what you are doing. The adapters are only about 10 bucks - probably a lot cheaper than any gauge you could find.

thanks Larry, that is exactly what I will do. Never thought of that/ Now I just have to find a dive buddy that I haven't talked out of buying an AI computer

 

[redacted]

We have a 3/8 to 11/16 adapter... Folks with very old regs that have 3/8 HP ports need them if they want to put on a new HP hose... So you could grab one of these, then put something like a AI computer in your LP port... If that is accurate enough for what you are doing. The adapters are only about 10 bucks - probably a lot cheaper than any gauge you could find.

Whilt that takes care of the "S" part of the problem, doesn't that still give gauge pressure rather than absolute. Isn't the SPG is still vented to ambient pressure. Although that should be just a matter of knowing your depth and adding in the ambient pressure to convert from gauge to absolute.

 

[wedivebc]

Whilt that takes care of the "S" part of the problem, doesn't that still give gauge pressure rather than absolute. Isn't the SPG is still vented to ambient pressure. Although that should be just a matter of knowing your depth and adding in the ambient pressure to convert from gauge to absolute.

I always thought SPGs were sealed. I don't know about AI computers. Anyone know for sure?

 

[scubatoys]

I always thought SPGs were sealed. I don't know about AI computers. Anyone know for sure?

Yea... It's sealed. If you take your adapter, toss it in your lp port and get 145 for your IP, then head on down to 33 feet, you should get 160 (rounded from 14.7 to 15) as long as it's working right.

All gauges are sealed... othewise you'd hear hiss and see a stream of bubbles... It's just a cheap IP gauge will not be waterproof... but you could take one of those under. Might be good to remove the face - the pressure will want to get into the housing of the gauge, but it won't get into the working parts of the gauge... That 14.7 can't really compete with the 160 or whatever on the inside parts - but if water can't get in to equalize the pressure, you might have the housing crack.

 

[wedivebc]

Yea... It's sealed. If you take your adapter, toss it in your lp port and get 145 for your IP, then head on down to 33 feet, you should get 160 (rounded from 14.7 to 15) as long as it's working right.

All gauges are sealed... othewise you'd hear hiss and see a stream of bubbles... It's just a cheap IP gauge will not be waterproof... but you could take one of those under. Might be good to remove the face - the pressure will want to get into the housing of the gauge, but it won't get into the working parts of the gauge... That 14.7 can't really compete with the 160 or whatever on the inside parts - but if water can't get in to equalize the pressure, you might have the housing crack.

Thanks Larry.
Actually what I am trying to confirm is that the plug I put in the environmental seal of a DS4 has defeated the depth compensation and that the pressure does not increase with depth.