About Proton OnSite

Proton OnSite is a global leader in hydrogen energy and innovative gas solutions. Since 1996, we have been developing and applying hydrogen technology in creative and practical ways that best meets the diverse requirements of our customers.  Our advanced proton exchange membrane (PEM) electrolysis systems coupled with our uncompromising attention to excellence and quality enables us to deliver, install and support gas generation units on every continent. Proton OnSite manufactures hydrogen, nitrogen, and zero air generators that you can rely on. Our on-site gas generators provide a safe, reliable, and cost effective way for our customers to get the gas they need, when and where they need it. Our commercial equipment is operating on every continent, from the middle of the desert and the depths of the sea, to the most prestigious laboratories in the world. No other company has as large of a commercial fleet, or as long of a recorded history with reliability as Proton OnSite. We are exclusively focused on customer solutions, and have the experience and products to assure success.


Industrial One Partner – On Site Gas System

It all began with a trip to the moon.

NASA’s Apollo Program was the ’60s-era race to the moon that culminated with Neil Armstrong’s walk on the lunar surface in 1969. During those crucial years, Francis X. Hursey was pioneering PSA (pressure swing adsorption) oxygen technology as a member of the spacecraft’s breathing air team. After Project Apollo, Frank helped develop one of the first oxygen concentrators for home use. It was this core of knowledge that led him to found On Site Gas Systems in 1987.

Who is On Site Gas? As you might have guessed from our name, we design and build gas-generating (nitrogen and oxygen) systems that function on-site at your physical plant. Our systems are used in mission-critical applications, across dozens of industries, in over 100 countries.

Our standard products are often modified or customized to meet specific customer requirements. All our systems are built in the USA. During more than 30 years in business, we have exhibited an unprecedented level of growth and excellence. Our customers use On Site Gas Systems to replace or augment other gas delivery methods, and many report monthly savings of up to 80%.

We are a private, self-funded company with over 40 employees, many of whom hold at least one patent. In a nutshell, On Site Gas Systems does just what our name implies: we design and build PSA and membrane nitrogen and oxygen generation systems that function “on-site” — wherever that may be. Our safe, continuous, flexible systems provide cost-saving, reliable gas generation for numerous applications, and can be found in over 100 countries. We are a unique company of customer focused product development engineers driven to find a cost effective solution to your industrial gas needs.

It is our privilege to be able to design and build systems that save lives, protect the environment, and offer simple, cost-effective solutions to our customers. Our systems deliver emergency oxygen on the battlefield and after natural disasters. Our nitrogen systems enable lead-free soldering and are used to preserve food, beverages, and pharmaceuticals.

On Site Systems pioneered the adoption of PSA technology. We are a non-cryogenic gas company with a global reach, offering membrane, PSA nitrogen systems (95-99.9995% purity), and PSA oxygen (USP 93-99% purity) systems for both medical and industrial use. We are FDA-approved for our military medical O2 systems — and our entire PSA and membrane systems meet or exceed USP standards for food grade and medical N2 and O2.


On Site Gas Systems’ products are proudly made in the USA, however, our reach is global. Our customers around the world know that On Site Gas Systems offer superior reliability and we’re proud to make quality products that can be used in the harshest global environments.

ISO Certified

We are a fully certified ISO 9001:2015 and ISO 13485:2016 manufacturing facility. In addition, our commercial products are UL, CE, and CSA certified along with all our pressure vessels being ASME certified. Our Quality Management System ensures that we provide our customers the best and the highest quality products possible.

Simply The Best Solution

On Site Gas Systems’ products are proudly made in the USA, however, our reach is global. Our customers around the world know that On Site Gas Systems offer superior reliability and we’re proud to make quality products that can be used in the harshest global environments.

R&D Leadership

Long-term commitment. Consistent leadership.

On Site Gas has always been a leader in nitrogen membrane, PSA, and oxygen generation. To ensure that we’re not only staying ahead of the curve, but also defining it, we decided long ago to dedicate a substantial portion of our resources to research and development. We bring an extraordinary depth of experience to bear. In fact, many of those involved in R&D at On Site have been with the company for decades.

Our founder and President, Francis X. Hursey is a veteran of the Apollo Breathing Air Team and has been awarded multiple patents in noncryogenic gas technology, medical products and nitrogen applications. He invented QuikClot® brand hemostatic agent and was recognized as a top scientist in 2003 by Scientific American.

Our philosophy is to keep the simple processes simple, while making complex processes less complex. This way of thinking has formed the basis for our growth, and has enhanced our reputation. We use COTS (commercial off-the-shelf) parts so that our systems can be serviced by a mechanically inclined person, anywhere in the world. We have worked with and tested all technologies involving PSA gas production, and continue to find that our technology, improved over time, makes the most reliable systems in the world. We constantly seek new ways to apply our proven technology.

Outstanding Customer Service

Customer service is an integral part of company’s mission. We are here to help guide you during your decision making process, answer questions along the way and provide outstanding service and support once your equipment is on location.

Nitrogen Applications

Nitrogen Generator Systems

On Site Gas Systems is a world leader in the manufacturing and design of nitrogen generators. We are experts in creating reliable and cost effective nitrogen solutions. Our experienced staff can help you to determine which system will best meet your nitrogen needs.

On Site’s PSA nitrogen generator technology assures quick returns on your investment and stable year-to-year gas costs.

The nitrogen membrane generator is a complete turnkey system. It arrives at your location and you put it online. We design and build membrane nitrogen generators to your specifications. We can match our membrane nitrogen generators to your compression equipment for any application.

On Site Gas Systems is a world leader in the manufacture of custom-engineered nitrogen generation systems. We have decades of experience in the development of engineered nitrogen generation and turnkey systems for nitrogen generation.

On Site Gas is known for standard, economically priced nitrogen generation systems that can be customized as needed. On Site Gas manufactures nitrogen container systems for highly efficient, cost-effective nitrogen gas generation.

Fill your own bottled gas & save with a nitrogen cylinder filling station

Nitrogen cylinder filling stations can be easily incorporated into any nitrogen generator system. We offer a convenient and reliable way to fill your own nitrogen cylinders for a fraction of the cost of bottled-gas purchase and delivery. Most nitrogen filling stations use booster pumps to fill cylinders with nitrogen up to 3000 PSIG. Higher-pressure nitrogen filling station options are also available.