Nitrox Training Center LlewocSIS
Nitrox Stik

Technical Training Center


Would you be blending


if it was accurate, inexpensive & easy?
Nitrox Stik

Llewocsis Article | System Specifics | Pricing | Training

The LlewocSIS Nitrox Stik is a Continuous Blending Unit that is:

provides consistent results,
simple to use,
sets up quickly and easily,
suitable for all compressor types and sizes that produce breathing grade air,
adjustable for mixes up to 40% oxygen, and
patent pending.

Why should you be blending Nitrox? 

Fastest growing area in the diving industry
More customers through your door
Nitrox divers tend to buy higher end products, resulting in increased profits,
More customer training opportunities for your facility

What is stopping you?
Traditionally, Nitrox blending equipment has been very expensive and has consisted of confusing technology.
Well... Not anymore!
The solution is here!

LlewocSIS Nitrox Stik
The unit comes complete, and sells for only US$2000.00
Oxygen Analyzers are available, wholesale, for US$385.00

All you need is:

your existing compressor
a bottle of breathing grade O2 (available from your local gas supply company), and
an oxygen analyzer.

Getting on-line:

Getting on-line with the LlewocSIS requires just quickly installing the unit, and calibrating it to your specific compressor. 

That’s it! You are now on-line and pumping up to 40% Nitrox.

Quickly, efficiently and inexpensively



In addition, if you don’t already have a qualified gas blender on staff, for your convenience, NAUI also offers the following training/certifications:

Gas Blender
Gas Blender Instructor
Nitrox User
Nitrox Instructor

We can quickly and efficiently train at your facility with NO hassle and NO disruption to your business. No Problem!


LlewocSIS Nitrox Stik

The Revolutionary Continuous Gas Blender

As the average age of divers in North America is increasing, so are the predisposing factors for "decompression sickness" (DCS). We in the dive industry are trying to find ways to minimize diving related conditions like "DCS". Presently, statistics show that the incidents of DCS are rare in the recreational diving community and becoming less common in commercial diving. This can be attributed to good training, the proper use of air tables, and the popularity of diving computers. The question is, will these statistics change as divers become less fit with the sedentary lifestyle that often accompanies middle age?

As you know, "DCS" is a serious medical condition that is caused by a diver being exposed to increased pressure for a given length of time. It is a direct result of the nitrogen in the air we breathe bubbling out of our tissues as we ascend from depth. The older we are, often the more susceptible we are to this condition. One answer to this potential problem is actually quite simple... Increase the oxygen in the air breathed underwater and remove a corresponding amount of nitrogen.

This idea was first used in the late 1800’s. Since then, the commercial, military, and scientific diving communities have recognized and utilized oxygen enriched air. In North America, Dr. Morgan Wells, Director of the National Oceanographic and Atmospheric Association (NOAA) developed a new process for mixing oxygen enriched air which he called a continuous nitrox blending system.

The gas blending standards set by NAUI were based on regulations as specified by NOAA, OSHA, USN, and USCG. These standards have subsequently become recognized by the majority of training agencies in the diving industry. One of these standards is that any part of a high pressure system that comes into contact with oxygen in concentrations higher than 40%, must be oxygen serviced. This means that stricter protocols must be in place in the areas of system design, cleaning and material compatibility.

Until recently, the use of a continuous nitrox mixer required that the high pressure compressor be oil free. This was the result of non-homogeneous mixing of the oxygen with air, which caused streams of unmixed oxygen to flow through the compressor.. Faced with this situation, Ross Cowell, a Canadian maritime engineer and technical diver, came up with a simple but effective solution. He felt that if oxygen could be thoroughly mixed with air, to a concentration below 40% oxygen, before it was introduced into the compressor, then any well maintained compressor could be used.

Basing his research on already proven technology in an aligned field, he found that a mixer used in the gas industry would blend the gas approximately ten times more thoroughly than the mixing coils on the current NOAA continuous mixer. By plumbing in an oxygen analyzer to measure the oxygen content before it is introduced into a compressors intake, he found that he would get completely homogenous (mixed) gas, in less than 2 milliseconds. To control the amount of oxygen introduced into the system, a safety "lock out" is incorporated, controlling the maximum oxygen content. In this way, the medical regulator is the only part of the system that is exposed to oxygen concentrations above forty percent, and it is manufactured in the USA and specifically designed for oxygen use.

In addition, the revolutionary design of the LlewocSIS Nitrox Stik enables it to be used on compressors of all types and sizes. If a compressor delivers breathing quality air, then oxygen servicing is not required, providing the oxygen content is kept below 40%, and the maximum working pressure is no more than 3000 psig.

Prototypes were installed on high use compressors and tested for one year. Mr. Cowells’ system worked flawlessly. As well, an independent engineering study was commissioned, making this one of the most thoroughly researched blending systems available. With the testing complete, patent applications followed, and the unit is now "Patent Pending".

NAUI Technical Training Operations is involved with Nitrox use in the diving industry. Their gas blending program is considered one of the most comprehensive and up to date courses available. Although all of the types of blending systems are covered in the course, the students actually get hands-on blending experience with equipment that includes the LlewocSIS Nitrox Stik. The industry presently has a lot of nitrox divers, with more coming on-line every day. The bottle neck is in the supply of Nitrox. The trick is to first become knowledgeable about Nitrox gas blending , oxygen servicing, and the types of blending systems available. Then you can make an informed decision about what is the best system for your operation. The bottom line is that whatever you do, do it safely. At the facility level it is vitally important that we set the standards by providing safe consistent Nitrox fills to our customers.

We have found that the biggest problem facing the diving industry today is the expense of setting up a safe/effective Nitrox fill station in diving operations. The LlewocSIS Nitrox Stik solves these problems. It is so easy to use that the phrase "Dial-a Mix" has been used to describe its operation, and the comparatively inexpensive manufacturing costs translate into affordable entry into gas blending, by even the smallest of diving operations. The LlewocSIS Nitrox Stik enables gas blenders to purchase a simple but effective gas blending unit that is easy to operate and produces consistent results.

For more information
or to place your order please contact
your NAUI Territory Representative

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LlewocSIS Nitrox Stik

Continuous Gas Blending Unit

Note: The LlewocSIS Nitrox Stik Continuous Gas Blending System is intended for use on compressors that are suitable for compressing EANx at up to 40% O2. These may be of the oil-free type, or of conventional lubrication design. Although the LlewocSIS Nitrox Stik is capable of homogenous blending far in excess of 40% O2, this practice is not recommended nor endorsed. As a designed process component, the LlewocSIS Nitrox Stik is sized for its intended compressor system. Variations in the process (i.e. varying the compressor speed) will have an effect on the operation and should be avoided.


These are typically K or T cylinders, with a working pressure of up to 2400 psi. (User supplied)


This is a conventional high pressure oxygen regulator with a maximum outlet pressure of 120 psi. It is attached to the cylinder valve by a CGA 540 fitting.


This is a locking metering valve. The intent here is to allow the use of the regulator’s pressure adjustment control to determine the O2 percentage of the system, while limiting the maximum oxygen concentration to 40% with the compressor at load.


This is conventional low pressure (150 psi WP) oxygen hose .


This comprises the concentric filter/preblender diffuser, the mixing stage, and the oxygen analyzer sensor receptacle. This is to be mounted securely near the compressor, coupled to the compressor intake with a short length of flexible hose which acts as a vibration isolator, in order to protect the O2 sensor. The filter/air inlet surface must have a good clearance all around (1 foot minimum). This must be in a well ventilated area, both for supply of fresh inlet air, and to allow adequate dispersal of oxygen should the compressor be stopped or shut down before the oxygen flow to the blender is stopped.


A small, portable, remote sensor type is recommended, such as the Ceramatec MaxO2, MSA MiniOX I, Teledyne TED-60 or Aquatronics. The sensor body is to have the o-ring seal adapter fitted. (User supplied)


Although this unit will ensure homogenous compressor inlet mixtures, preparing and handling pressurized oxygen and oxygen/air mixtures is a skilled operation, not to be undertaken without proper training. It can be hazardous and in this view, no liability for any subsequent damage or injury can be accepted by the developer, the manufacturer or the seller.

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"If all we do is supply our diving instructors with Nitrox, so that they are less at risk during their open water classes; then it is well worth the small set up cost of the LlewocSIS"

Wayne Molesworth......Atlantis Aquatics......Spokane, Washington

LlewocSIS Nitrox Stik Gas Blending System comes complete with:
blender unit
HP oxygen regulator
1" tubing (approx 6 feet)
1/4" tubing (approx 6 feet)
Micro metering valve
Locking cap

Spare filters are available for $50-$125, depending on "Stik" size.
Oxygen Analyzers:  
Ceramatec MaxO2 Analyzers
Replacement sensors for Ceramatec
MiniOX 1 Analyzers
Replacement sensors for MiniOx

 PLEASE NOTE: All amounts are in US Funds. Shipping, insurance and applicable taxes are extra.

For more information
or to place your order please contact
your NAUI Territory Representative

Nitrox Training Center
NAUI Technical Training Operations
202 West Mars
South Padre Island, Texas 78597
[email protected]

Technical Training Center

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NAUI Worldwide, established in 1960, is continuing its mission to enable
people to enjoy underwater activities as safely as possible by providing
the highest quality practical education. 

For more information on NAUI and NAUI membership contact
NAUI Worldwide
PO Box 89789
Tampa, FL 33689-0413
Telephone (800) 553-6284 or (813) 628-6284.
WARNING: Technical diving is a potentially dangerous activity and requires very special training, equipment and support. If you are not prepared to do the work, invest in equipment and training and do it properly, don't do it!

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