Peregrine TX AI - Depth alert set to MOD?

[Jollymon32]

So setting up computer for Nitrox diving.

I see how the MOD varies with different O2 concentrations.

However, the DEFAULT depth alarm is set to 130 feet and does not seem change automatically.

I have the MOD info set as an entry into the Mini 1 box so that I can see MOD at all times.

Questions for the experts:
1) Does the DEFAULT depth alarm change automatically based on MOD for a particular gas?
2) Does the MOD entry in the MINI box go yellow and red if you get near or exceed MOD? (The manual states that the larger MOD entry will go yellow or red, the question is specifically for the MOD entry in the MINI box).

Thanks!!!

 

[inquis]

1. No, you dictate that value.
2. Don't know about the mini's coloring. My suspicion is yes.

You may be able to test it on land by temporarily setting the max PO2 below your surface pressure and breathing gas at 99%. I don't know if the MOD setting has a lower limit that would prevent this, but it's what I'd try.

 

[crofrog]

Why do you feel the need to have the MOD displayed on the computer? That is information that doesn’t change

 

[GreggS]

Why do you feel the need to have the MOD displayed on the computer? That is information that doesn’t change

Exactly right. One should know what the MOD is and remember it. What's more important to display is PO2. Even if one exceeds their MOD briefly, so long as they don't exceed their PO2, there shouldn't be any harm done, especially if it is set for less than 1.6.

As for the OP's question, no the depth alarm has to be set manually. However, once you put your mix percentage in, it will calculate your MOD. According to the manual, you will automatically get alarms for MOD, PO2, and O2 toxicity. The colors will change to yellow a if you are nearing these levels, and to red if there is an urgent need to ascend.

I do have the Peregrine TX myself, but have not had occasion to be at or near the depths to trigger any of these alarms since I bought it. That's why I referred to the manual for this. If the OP hasn't already, I recommend doing so forthwith.

 

[crofrog]

Exactly right. One should know what the MOD is and remember it. What's more important to display is PO2. Even if one exceeds their MOD briefly, so long as they don't exceed their PO2, there shouldn't be any harm done, especially if it is set for less than 1.6.

Unless your on a rebreather your pO2 is just a f(depth) so if you know your mod, and your mod is based on your acceptable maximum pO2 then why display it.

 

[MyBuddy]

1. If you look at page 24 of the Peregrine TX manual you’ll see that the High PPO2 alert, letting you know you’ve exceeded your MOD and the Depth alert are two distinct alarms. Once you’ve acknowledged the high PPO2 alert a persistent MOD alert will be displayed on the screen seen page 22.

2. I’ll echo the posts above and recommend choosing another field in its place. Possibly Current PPO2 if you really want to keep an eye on it. Though, you should know the MOD from when you planned the dive and analyzed your gas. It can also be triple checked by a few presses of a button on your computer. There’s probably better options, but I don’t know what other fields you already have selected.
I can’t say with 100% certainty that it would change color in the mini display but my money would be that it would change. But even if it doesn’t it’s a moot point since you have the big red persistent MOD alert on the screen, shown on page 22 of the manual.

 

[GreggS]

Unless your on a rebreather your pO2 is just a f(depth) so if you know your mod, and your mod is based on your acceptable maximum pO2 then why display it.

It really isn't necessary, but I just like to see as much info as possible. My old Oceanic OCi showed it by default when on nitrox, so I guess I just got used to seeing it.

 

[Jollymon32]

Thanks for the responses. Much appreciate the input.