The Nitek will not switch gasses "on its own". It requires two distinctive
and positive moves to complete a switch. As Jim pointed out, you can tell it
which gas to start your dive with by accessing Dive Plan Mode (pg 21). If
you do not do this, it starts the next dive on its' last setting. If you
ended your last dive on mix 3, it starts the next one on mix 3. Well this is
typically O2, so if you fail to tell it mix one and don't check it when you
hit the water, then it will blare warnings as you pass the magic po2 of 1.6.
It will not let you switch to the correct gas until you go back above 1.6.
If you try to switch to a hot mix, it won't let you lock it in (if a gas is
still blinking, its' not locked in). It will now automatically go back to
the last gas. The magic number here is po2 of 1.6
If you don't want to access plan mode, switch the computer back to mix one
(or whichever one you want it to start the next dive with) before you get
out of the water. I just check it as I'm descending and verify the mix
before going below 20 ft.
If you set your o2 for 95 % instead of 99%, it will lock in at 20 ft. no
problem. While it doesn't show decimal points on the po2, it still takes
them into account. Reach a 1.59 po2 and you can lock in.
As far as testing goes, our equipment is tested in actual day to day diving,
by myself and several others with as many scenarios as we can think of.
Sometimes too many scenarios, we would like to keep it much more simple ;-)
However, we can't personally train everyone who uses our equipment, so we
have to expect the worst. It is unfortunate, but very true.
We are always looking for ways to improve and welcome all comments.
Thanks for Buying Dive Rite.
Best Regards,
Dell Motes
Dive Rite
117 W.Washington St.
Lake City, Fla. 32055
www.Dive-Rite.com




-----Original Message-----
From: Jim Cobb <cobber@ci*.co*>
To: Mark Wagstaff <wags@pr*.co*.au*>; ajmurphy@sn*.ne*
<ajmurphy@sn*.ne*>; techdiver mail <techdiver@aquanaut.com>
Date: Sunday, May 09, 1999 4:02 PM
Subject: Re: Abyss Explorer Nitrox / deco program validation


>Sender: Mark Wagstaff  Date: 5/7/99 11:51 PM
>
>>I use a Dive Rite Nitek3.  Good computer IF IT IS USED PRIMARILY AS A
TIMER
>>FOR YOUR TABLES but the decompression info adds a comfort zone (deco
>>computer for Nitrox dives only - operates as a timer for Trimix).
>>
>>One criticism, the screen is a bit small.  One word of advice: changing
>>mixes is done by pushing the buttons on the front face.  This works well
and
>>is vastly superior to the Cochran mechanism.  BUT myself and another user
>>have had a couple of occasions when the mix has changed without our
>>intervention.  This has been due to the pressure fluctuations of entering
>>the water operating the buttons.  Always stop briefly at 3m to check mix
>>(and all your other gear).
>>
>>Note: on the dive I noticed the mix had changed I was could refer to
tables
>>and used the Nitek as a timer.  The importance of having tables and a back
>>up timer cannot be stressed enough.
>
>There are 2 occasions where the mix will change on a NiTek3. The first is
>when you did not set the default mix, it should be the one which comes up
>when you switch to plan mode. The second is when the computer does not
>like your PP02 selection for a particular depth, it will want to change
>back. This is particularly noticeable on the 20' 02 stop.
>
>
>>I have heard tales of woe of the Cochran.  Batteries being a common fault,
a
>>friend is on his 6th after it keeps blacking out.  Also, on multiple dives
>>they have been showing massive deco penalties that were quite unrealistic.
>>I don't think they are reliable enough.
>>
>>I didn't think the Abyss was released yet?
>>
>>General question to everyone:  what governs deco computers, software, etc.
>>Who validates the algorithm?  Who approves the systems.  Someone has
posted
>>details of a program he wrote, how was this tested?
>
>As far as I know you have a group of "beta-divers" who take the thing
>down and dive it. I suppose the unit can be put in a dive simulator
>pressure tank. The Nitek is made by Seiko.
>
>Here's a good one. DiveRite called our local dive shop and asked if this
>guy who lives in Richmond had actually bought his computer there.
>Apparently this weasel had sent a letter with his Nitek registration card
>saying that he was diving in Australia and while there a Great White
>shark had bit it right ooff his wrist. He wanted DiveRite to give him a
>free new computer. Turns out that when he was down here he asked to look
>at a nitek and stole the registration card out of the box. What a fucking
>weasel.
>
> Jim
>
>
> -------------------------------------------------------------------
> Learn About Trimix at http://www.cisatlantic.com/trimix/trimix.html
>
>
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