June 23rd, 2009

Tank hitting the head and the TransPac Harness


Lately we have received customer support email from people with a common problem. When wearing their new TransPac, the tank is too high and they can feel the tank valve at the back of their head.  If you have the right size harness then the problem can be easily addressed if you look at the TransPac as a new piece of gear and not the latest version of an old BC.


Make sure that the side plates are close to the backplate. When you put your arms down by your side the leading edge of the plate should contact your arm, not the center or back of the plate. Some people say they like the plates forward so the adjustment straps are easier to adjust, this is the first mistake. The adjustment straps are to tweak the size from wetsuit to drysuit and are rarely adjusted. If you like to play with them that’s the problem.


Proper fit is

1. Step into the harness

2. Adjust the chest strap so the shoulder straps come straight down over the shoulder.

3. Fasten the waist belt, make sure it is snug

4. Pull slack out of the shoulder/plate adjustments but not too tight


Since the design is similar to backpacking, the lower you sit when putting the harness on and pull slack out of the shoulder straps the higher the tank will ride. Don’t try to pull all the slack out of the adjustment, you could be looking at the regulator over your head. So don’t tighten it too much and use a crotch strap, it helps center the rig and keep it from moving around. If you have problems I am always ready to go diving and help, you just need to come to my backyard.


Watch our TransPac fitting videos to see what I am talking about.


June 17th, 2009

NiTek X Desat Calculation


We received two NiTek X units in service due to display errors. The DESAT information would not come back once the X was awakened after going into sleep mode. I tested it and found this to be true, but random. I then learned the following from the programmers.

DESAT, or desaturation time is the amount of time that must pass before the residual nitrogen and helium levels drop to a point where subsequent dives are treated as a single (non-repetitive) dive. This is not the same as “time to fly”.  On the NiTek X DESAT times are displayed when the PGT bar graph (on the right of the computer screen) is showing one or more bars.

This explanation gives more merit to tracking tissue saturation than a 12 to 48 hour countdown most dive computers do including the earlier NiTek 3 and NiTek HE.  When diving the NiTek X I see a noticeable reduction in decompression time compared to the NiTek Plus. A 60 minute dive at 100-feet using 32% Nitrox gives me 15 minutes of decompression on the NiTek Plus and then 8 minutes after switching to oxygen at 10-feet. The NiTek X only gives me 1 minute of decompression on Con 1 setting.  The more information a dive computer uses to calculate decompression the better the results. The X uses 16 tissue compartments while the NiTek Plus uses only 9 compartments. You can customize the X for deep diving with variable gradient factors to make the decompression fit the environment.

We’ll look at adding a standard countdown in the next software upgrade.


June 4th, 2009

NiTek X


The X is in full production now and we have inventory in-stock. I have over 100 hrs on my unit. We are building the NiTek X in-house at Dive Rite. This gives us full control to improve the product and track changes. One improvement we did before we shipped the first 50 beta units was to change the battery cap. The original cap could be tightened with a coin, but this could scar the cap. We changed it to a cap with finger grips like the Fischer cap on the other side, plus we added a new cap spring.

This fixed one problem, but created a new one. Since the new cap can be installed without a tool people like to check the battery and don’t tighten it securely. If it is not tight pressure can push the cap and you can lose connection and the computer resets. All units leave the factory with the cap secure and pressure checked to 275-feet. If you have the urge to pull the battery for any reason make sure the cap is tight. We have a tool (CO8212) if you feel the need to pull the battery and check it frequently. The battery should last the average diver over a year.

The X has a sleep mode and pushing either button will wake it up. It stays awake for 10 minutes before returning to sleep mode to conserve battery power. It is auto activated at 5-feet (1.5m) via the pressure transducer, not a wet switch.