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I can't speak to the Orca Spirt or Spirit LTE, but Edd Sorenson has pushed the Kiss Sidekick very hard in terms of flooding tests. He described one test where he opened the DSV pre-dive and flooded the exhaust hose, then dove the unit for 5 hours, including unusual attitudes to try to move the...

Right, the "R22S" O2 sensors are the same as "R22D" with the exception of the removal of the hydrophobic membrane over the sensor cathode, as well as the removal of the humiseal treatment of the sensor's printed circuit board. That implies that the "S" sensors won't work reliably in a CCR...

I have not formally plotted the output of my cell tests, and I'm not inclined to mess with a serial port to output the data to a computer, but looking at the numbers as the PPO2 rises from .21 to 1.6, the resulting percentage change from the actual PP02 in the pot is clearly a curve, and the...

Diaphragm first stages are not an ideal choice for an O2 reg, as that diaphragm is a large chunk of fuel, and they take a little more care in valve management to prevent ignition as the results are much more spectacular if you light one up.

My preference for my primary regulators is to use a well made, sealed ambient chamber, diaphragm first stage like the Scubapro Mk 17 or Aqualung Legend. The sealed design keeps grit, salt water, etc out of the ambient end of the first stage. Both the above designs have more than enough...

Price reduced to $180.

Before I transferred to the east coast, water temps below 40 degrees were common year round at any depth below 100' and 35 to 39 degree water temps were the norm, except on ice dives where it would be 32-33 degrees right under the ice. Fresh water begins to expand at 35 degrees, and begins to...

Let me clarify it for you. The O2 content and pressure in the pot is a known quantity, and thus you can compute the actual PPO2 of the gas the cells are exposed to. The cells are calibrated at the start of the test at 1 ATA and then the pressure is in the pot is increased incrementally and...

O2 cells: I wasn't satisfied with the linearity check on 02 at 20 ft and started using a DE-OX cell checker. I'll check them periodically and note the changes over time. Once I start to see either differences between the actual PPO and the displayed PPO2 at 1.3, or excessively long response...

If you are using a leaky valve design, the O2 first stage needs to have a fixed, non depth compensated IP, but that IP also needs to be adjustable in order to fine tune the flow rate through the fixed orifice. The first stage also needs to be well balanced so that the flow rate doesn't change...

My first course with a rebreather was with a Draeger Dolphin in the late 1990s and it was enough to convince me it wasn't worth buying. Even the instructor was a proponent of converting to mCCR configuration. I had similar thoughts about the Explorer when I first saw it - and I figured it...

You're being over concerned in the wrong areas. First, A solution of 50% white vinegar and 50% 91% rubbing alcohol won't ruin your suit, but rinsing your pee valve with it after every dive day will kill what's in there before it can get established. Alcohol has a Ph of 5.5 so it's mildly...

Acidic cleaners are used to remove corrosion and mineral deposits. Basic cleaners like Blue Gold and Simple Green are used to remove old lubricants and dirt attached to them, and generally degrease parts. Mixing them together is a non starter as mixing an acid and a base can get interesting...

The only time I had issues with a hose rubbing the back of my neck was on one incredibly long 5 day trip on a liveaboard. It was an incredibly long week, as pretty fish diving in tropical without a hood allowed the braided cover on the hose to rub my neck raw after about the 3rd dive on day 1...

I'm in agreement with Tom that canting the first stage, so the end port gives the hose a head start down under the arm will help, and having the 20" hose on the side and angled toward the diver will give the 20" hose an assist as well. Regarding Questions 1 and 2, there's nothing wrong with...

Let's hope so, but I've seen a few bent cross bars in my time from uneven tanks getting dropped or set down hard, particularly if the bands are cheap or not as tight as they should be.

That's one of the primary reasons to keep the flow rates slow, particularly with higher O2 percentage mixes. Gas flowing across a sharp edge can cause it to heat up, and that can create an ignition source. Similarly, you want to avoid any sudden stops for the gas for the same reason as the...

Since we started trimix diving, I've used Analytical Industries' TruMix 4001 and it's been very effective and very easy to use for both nitrox and trimix. Before that for O2/nitrox testing, we used OxyCheq's El Cheapo II analyzer kit. It's just $110 and includes the $80 sensor. If you add the...

I'm morbidly curious about the G2 results as it's Scubapro's chance to get a tech computer right. I participated in the trimix Beta for Scubapro's original PMG on the Sol and Luna, and found that it was ridiculously conservative - to the point it was not practical to use it along side another...

As noted above, you can't put one gas in one side and another gas in the other and expect them to mix. Well....I suppose browning motion might take care of it in a year or so. You'll be putting the O2 or the HE in first depending on what the pressures are in your supply tanks, and then you'll...