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Old 6th May 2008, 20:40   #16 (permalink)
Underwaterbear
A Prismer in Megland
 
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Current Rebreather/s:
Prism Topaz

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Join Date: May 2005
Location: Seattle, WA
Posts: 190
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Re: I'm not really happy with todays HUDS..

Semantics, gents.

Sunnyboy, your original post had two "RIGHT LEDs" in your description. And Stefan was just pointing put that the Left LED (aka "the other RIGHT one" or the "Green, or really a kind of orange at depth, and sometimes red one") should flicker slightly with each cycle of the setpoint controller (ie several times each second) - this lets you know the thing hasn't hung on you. It dims with low ambient light and turns red, brightens and flashes with increasing ppO2.

The other two do not dim as they are warning Leds and flash as described, or in the case of most prisms, frequently for no apparent reason.

The whole purpose of the HUD is really just to lure you into a false sense of security and then to make you shit yourself and look at the secondary when you get a christmas tree!

Cheers
AB


Quote: (Originally Posted by sunnyboy) View Original Post
I quoted right out of my Prism manual - which also agrees with my HUD.

There is only one right led - it can display green/dim red/bright red/flashing red. The center led is either off or blue.

Not quite sure what you mean by pulse. If mine is pulsing, then it's a pretty minor as it is not something I notice underwater. Likewise the dim-red bright-red is pretty hard to detect underwater.

However, it doesn't really matter. Blue means O2 below setpoint, green means A-OK and red means O2 above setpoint. Flashing red means PO2 above 1.55. You can only ever see one of these colors at any one time as the trigger conditions are all mutually exclusive.

I also left out calibration / power-up modes.

-S
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