All green or vascular plants consume oxygen all the time. Oxygen plants release oxygen through photosyntesis but they still consume oxygen at the same time. The primary way plants use oxygen is through their root cells. In order for a plant to take up water and nutrients from the soil, it must continually grow new root hairs. The cells that make up these hairs are living cells that do not carry out photosynthesis. They are similar to the cells of animals in that they require oxygen and give off carbon dioxide as they burn carbohydrates to obtain the energy they need to function. This is why you can "drown" a house plant by watering it too much. If the soil gets too saturated with water, the plants root cells can't get enough oxygen from the air.

There are vascular plants such as cypress trees and cattails that are adapted to living in saturated soil. These plants have root hairs that grow out of the stems above the soil and/or water surface so that they can take in oxygen. When a plant is green, it is giving off more oxygen through photosynthesis in it's leaf and sometimes stem cells than it is consuming through it's root cells so that is why you hear people say that plants are "opposite" of animals in that they take in carbon dioxide and give off oxygen.

Commercial aircraft provide emergency oxygen to passengers to protect them from drops in cabin pressure. Chemical oxygen generators are not used for the cockpit crew. In narrow body airliners, for each row of seats there are overhead masks and oxygen generators. In wide body airliners, such as the DC-10 and IL-96, the canisters and oxygen masks are mounted in the top portion of the seat backs, since the ceiling is too high above the passengers. If a decompression occurs, the panels are opened either by an automatic pressure switch or by a manual switch, and the masks are released. When the passengers pull down on the mask they remove the retaining pins and trigger the production of oxygen.

Accidental activation of improperly shipped expired generators caused the ValuJet Flight 592 crash. An ATA DC-10, Flight 131, was also destroyed while parked at O'Hare Airport, on August 10, 1986. The cause was the accidental activation of an oxygen canister, contained in the back of a broken DC-10 seat, being shipped in the cargo compartment to a repair station. There were no fatalities or injuries because the plane contained no passengers when the fire broke out.

The air we breathe in generally contains 21% of Oxygen, 78% of Nitrogen, and other trace gases. Oxygen generation systems primarily separate this oxygen from compressed Air through a very unique process called Pressure Swing Adsorption (PSA).

The Pressure Swing Adsorption process that is utilized for generation of enriched oxygen gas from ambient air, uses the ability of adsorbents (synthetic Zeolitic Molecular Sieve) to absorb primarily nitrogen. While nitrogen gets concentrated in the pore system of the Zeolitic Molecular Sieve, Oxygen is enriched as a product.

A PSA Oxygen generator works like this, two vessels are filled with Zeolitic Molecular sieve as the adsorbers. Compressed Air is allowed to pass through the first adsorber. The molecular sieve is able to selectively adsorb Nitrogen. Which allows the remaining Oxygen to pass on through the next adsorber and make its exit as a product gas.

As the adsorber is fully saturated with Nitrogen, the inlet airflow is subsequently switched to the second adsorber. The first adsorber is again regenerated by desorbing the nitrogen by depressurisation and then purging it with the product oxygen. The cycle goes on and the pressure continually swings in between a higher level-adsorption (Production), and in the lower level - desorption (Regeneration).

Nitrogen generators are dependable outlets for nitrogen. As the name implies, these machines are designed to generate, or create, nitrogen. Nitrogen is a clean, dry gas. The use of nitrogen generators eliminates the problems associated with handling gas cylinders. In addition, Nitrogen generators  cost less than gas cylinders. The gas is used for many applications, including:

• to fill tires in automobiles and aircraft, though not necessarily for regular consumer use
• to help preserve the freshness of bulk and packaged foods
• to place on the top of explosives to improve safety
• to aid in the production of electronic components

Nitrogen generators  are available with a multitude of different features and qualities. Some Nitrogen generators  available on the market, for example, require little or no maintenance after installation. Others include safety shut-off buttons and alarms. To eliminate the possibility of damage, the filter in nitrogen generators should be regularly changed. For proper maintenance, these air filters should be changed every year, and the oxygen sensor should be changed every two years.

The latest technology in nitrogen generators is the use of cryogenic air distillation, which is used to generate nitrogen. With this method, the air is compressed and then purified within the nitrogen generator. Later, it is cooled with a special cooling unit.

The medical oxygen generator  offers health care providers the most cost effective answer to profitably in home care environment. Most efficient and reliable medical concentrator on the market.

Valve is maintenance free, self cleaning, insensitive to contamination and invulnerable to wear. It sequentially directs the flow of compressed air to groups of four sieve beds (adsorption), while another four beds are purged into the atmosphere through the valve. The remaining four of the twelve beds are interconnected through the valve to equalize pressure as the sieve beds sequentially transition between adsorption and non.

Contrast to conventional concentrator, the small amplitude pressure swings generated by the Integra twelve beds eliminate loud noise impulses, the need for pressure regulator and reduce compressor wear. No other system offers the quiet elegance and maintenance free reliability of the Integra medical oxygen generator .

Designed to be compact and quite for the full range of oxygen therapy users, including high-flow patients in the home or clinical therapy use.

Medical oxygen generator  for single patient service 7 liter unit features maintenance free self cleaning module.

 Recently, in the USA, the National Institute for Occupational Safety and Health (NIOSH) chose On Site Gas Systems to develop a high volume, high purity Nitrogen generator for coal mine, for underground coal mine use to inert behind coal mine shaft seals. This initiative is in support of The Mine Safety and Health Administration’s (MSHA) recently strengthened regulations in the USA regarding sealing and inserting of unused underground mines.

On Site Gas Systems was suited for this application given their extensive experience designing nitrogen systems coupled with their direct experience in inerting behind the seals of coal mines along with multiple applications of inerting a coal mine after a fire.

On Site Gas Systems have designed customised Nitrogen generator for coal mine for dozens of industries in a multitude of applications and these systems are sold in Australia through On Site Gas Systems Australia, who has a fast growing number of local installations in a wide variety of industries.

According to Rodney Rodrigues, General Manager, On Site Gas Systems Australia, On Site Gas Systems have expertise in producing and delivering nitrogen at the point of use at the customer’s specified purity, pressure and flow. These systems are designed and built under the supposition that they must operate for decades in the most remote locations in the world, under the harshest environments.

VPSA oxygen generator, easy to operate, maintenance is simple, relatively low investment, low operating costs in China Market for more businesses to the promotion of the pulp. oxygen bleach cleaner production technology is free Chlorine Free (TCF) or elemental chlorine-free bleaching (ECF) to replace three sections of CEH bleaching, pulp and paper industry is the solution of environmental pollution, one of the cleaner production technology. Oxygen bleaching bleaching process of development of the necessary cleaning process above, due to oxygen non-toxic, no pollution to the environment itself, as oxygen delignification, the posterior segment of the bleaching agent and bleach can reduce waste by 50%. In recent years, in view of the requirements of environmental protection, the domestic of the growing interest in VPSA oxygen generator. The Swedish government to oxygen delignification as a new pulp bleaching plant as a pollution control measures. Has proved to be substantially reduced oxygen bleach bleach wastewater BOD, COD and chroma of the total organic chlorine content, its modern pulp bleaching wastewater to reduce pollution has played an important role. Oxygen bleach can also save the consumption of other chemicals, and chlorine bleaching of pulp bleaching agent compared to increase pulp yield. Liquid VPSA oxygen generatorcan be used to extract black liquor into the recovery system, or after the sequence into the general waste water treatment section.

We are manufacturers and suppliers of PSA nitrogen generator. Our PSA nitrogen generator are being manufactured as per the latest technology & design of the Company ING. L. & A., BOSCHI, ITALY. This technology has been proven all over the world for its working efficiency & trouble free operation. Our R&D Department is one of the first in the World to develop high purity oxygen generator from97% - 99%.

Theory
PSA nitrogen generator consists of air compressor, control value, adsorber, vacuum pump, buffer, electronic control system and instrument control system. In this design there are 2 or 3 molecular sieve towers which cycle alternately-in Production and in regeneration. Feed air enters into the bottom of one tower, when passing through the adsorbent layer, N2 and the vapors are adsorbed by molecular sieve and O2 passes through the adsorbent and gathers at the top of tower, flowing out as produced gas. Meanwhile the other tower is in the process of regenerated tower and begins to produce O2. Two (or three) towers alternately adsorb and constantly produce O2. As the regeneration of molecular sieves is done by a vacuum pump under negative pressure, it is called vacuum pressure swing adsorption, VPSATCO- P oxygen generator use PLC central control, humanized design and touch screen panel. It has high accuracy and quick start up.

Air separation plants produce the atmospheric industrial gases nitrogen, oxygen and argon using electrical power and air as raw materials.  While there are variations in process details, reflecting desired product mix and other factors, all air separation plants employ one of two types of process technology:

	Cryogenic air separation plants - Produce nitrogen, oxygen and argon as gas (and liquid) products using very low temperature distillation to separate and purify one or more of these components of air. Cryogenic plants are most commonly used to produce high purity products at medium to high production rates.
	Non-cryogenic plants - Produce gaseous nitrogen or oxygen products using near-ambient-temperature separation processes. There are two major types of non-cryogenic processes, using either selective adsorption or differential permutation through membranes to produce relatively pure oxygen or nitrogen. These processes use differences in properties such as molecular structure, size and mass to achieve the desired degree of separation.  Non-cryogenic separation processes are most commonly used when high purify nitrogen or oxygen is not needed (e.g. nitrogen which is 98 to 99.5% oxygen-free, or oxygen at about 93% purity) and when product demand is relatively low; for example: nitrogen at production rates less than about 20,000 scfh / 500 Nm3 or oxygen at production rates less than about 55,000 scfh / 1500 Nm3 .