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Nitrogen Generator

Nitrogen generator
No. 2700-12B No. 2700-11B No. 2700-09B

Nitrogen Generator AI
  • State-of-the-art membrane separation technology produces dry nitrogen up to 99.5% pure
  • Eliminates drawbacks of conventional nitrogen sources—gives you control of rate and purity of nitrogen production
  • Delivers gas flows up to 400 SCFH or more depending on nitrogen purity requirements (even higher flows possible if only dryness is desired)
  • Low-pressure alarm indicates drop in inlet pressure, alerting you to a problem that could result in diminished flow/purity
  • Compact, lightweight design allows set-up wherever there's a compressed air supply
  • Ideal for the complete range of cleanroom applications—from glove boxes to automatic storage systems
  • Simplicity of field-proven design ensures completely reliable, economical operation, virtually eliminates maintenance
  • Three models available with three flow ranges.

This Nitrogen Generator represents a series of advances by the world leader in hollow-fiber membrane technology used in the first artificial kidney. It gives you complete control of the production of nitrogen for use in a wide range of cleanroom applications—and in most cases quickly pays for itself.

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CE Mark
CE Declaration
Nitrogen Generator (See specification table)
Inches (mm)
Uncrated Weight
Lbs. (kg.)
Flow Range*  
Cat. # Price
18 x 18 x 81.25
(457 x 457 x 2064)
including 1.25 (32) for leveling feet
0-400 SCFH 2700-09B $ 15,360
24 x 12 x 49.25
(610 x 305 x 1251)
including 1.25 (32) for leveling feet
0-100 SCFH 2700-11B $ 6,847
20 x 12 x 35.5
including 1.25 (32) for leveling feet
0-10 SCFH 2700-12B $ 5,509
* For 99% N2 purity. With 100psi inlet pressure
Replacement Filter Elements
1 µm Filter 2700-15 Price
0.025 µm Coalescing Filter 2700-16 Price
Nitrogen Generator

Nitrogen Generators
Purity vs. Flow Rates (@100 PSI Inlet feed, 72°F, 22°C*)
Model   Purity  
  99% 98% 97%
No. 2700-12B 7.4 CFH 10.2 CFH 12.5 CFH
No. 2700-11B 49.0 CFH 65.0 CFH 75.0 CFH
No. 2700-09B 126.0 CFH 180.0 CFH 223.0 CFH
*Higher flow rates for a given purity can be achieved with high feed pressure and temperature. Contact Terra for information on high-pressure compressors and inline gas heaters.

High-Capacity Nitrogen Generator

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State-of-the-Art and State-of-the-Budget
A nitrogen membrane provides a low-cost, highly efficient means of separating air into its component gases. Because this technology requires no moving parts and consumes relatively little energy, it is surprisingly economical to operate and maintain—the main expense is the energy required to provide a stream of compressed feed air. Each system contains gas pressure control valves and instruments, a coalescing filter and carbon filter (which removes particles and liquid vapors from the feed line), and the nitrogen membrane module.

The membrane module consists of bundles of hollow fiber, semipermeable membranes. Each fiber has a perfectly circular cross-section and a uniform core through its center. The wall thickness of each fiber is thus consistent, which contributes to the physical strength of each membrane. Because the fibers are so small (about the diameter of a human hair), a great many can be packed into a limited space, providing an extremely large membrane surface area that can produce a relatively high volume product stream.

The hollow fibers are assembled parallel to a central core tube, and the bundle is inserted into an outer case to form the air separation module. Compressed air is introduced into the center of the fibers at one end of the module and contacts the membrane as it flows down to fiber bores. Oxygen, water vapor and other "fast gases" pass through the outside of the fibers. The oxygen-rich gas stream then flows through the fiber bundle to the periphery of the case, where it is discharged as a by-product.

While all but a small fraction of the oxygen passes through the membrane material to the exterior of the hollow fibers, most of the nitrogen present in the feed air is contained within the hollow fiber membrane. Since water vapor passes through the membrane along with the oxygen, this nitrogen product is essentially moisture-free. The nitrogen stream emerges at a pressure slightly below that of the feed air pressure.

Design Simplicity Means Easy, Reliable Operation
Because the heart of the system, the membrane module, contains no moving parts, it requires no maintenance. The only attention a system typically needs is a watchful eye on the inlet gas flow and an occasional filter change. Terra's Nitrogen Generators make these tasks easy with a built-in low-pressure alarm to alert users of gas line kinks or compressor malfunctions via an easy-to-see indicator light.

Each Nitrogen Generator consists of a membrane module, controls and instrumentation, and coalescing filters and traps to remove oil and liquids, organic contaminants and other particulates from the feed air. Installation merely requires piping compressed air to the system, and piping the nitrogen to its destinations. Order Terra's oil-less clean air compressor separately.

Note:These are typical values for the most common models. Specialized systems can be tailor-made to suit individual applications.
Housing: Powder-coated white CR steel cabinet with polypropylene leveling feet
Feed Air Pressure: 200 PSIG max.
Feed Air Temperature: 40ºF to 122ºF
4°C to 50°C
Nitrogen Outlet Flow: See graphs below
Prefilter: One-micron absolute filtration. Dual glass micro-fiber filter beds coalesce and remove water droplets. Remaining oil content: 1 ppm by weight. Includes slide indicator (to indicate need for filter change), liquid-level indicator and internal drain. ISO 8573.1 Quality Class - Solids: Class 2, Oil Content: Class 4
Coalescing Filter: Absolute filtration of 0.01 µm particles; 99.999% oil removal efficiency. Includes slide indicator (to indicate need for filter change), liquid-level indicator and internal drain ISO 8573.1 Quality Class - Solids: Class 1, Oil Content: Class 1
Membrane Module: Semipermeable hollow-fiber bundles
Electrical Requirements: Required only for user-supplied air compressor
flow chart

Nitrogen Flow

Nitrogen Generator

Typical Nitrogen Product Flow Rates
Nm3/h (scfh) flow at purity —13.8 barg (200 PSI) and 45°C (113°F)
Model Purity Level
95% 96% 97% 98% 99% 99.5%
2700-09B 65 55 45 36 26 20
(2461) (2084) (1715) (1350) (970) (745)
2700-11B 18 15 12 10 7 5
(673) (570) (468) (369) (266) (205)
2700-12B 1.5 1.3 1.1 0.8 0.6 0.5
(59) (49) (41) (32) (23) (18)
Air Feed Requirements
Nm3/h (scfh) flow at purity —13.8 barg (200 PSI) and 45°C (113°F)
Model Purity Level
95% 96% 97% 98% 99% 99.5%
2700-09B 122 111 99 88 76 70
(4655) (4218) (3776) (3331) (2883) (2654)
2700-11B 34 30 27 24 21 19
(1274) (1156) (1034) (913) (787) (726)
2700-12B 2.9 2.6 2.4 2.1 1.8 1.7
(110) (99) (91) (80) (68) (65)
Flow Volume Decrease
Outlet / Inlet flow, By Percentage
At N2 Purity Oulet Flow
95% 53% of inlet flow
96% 49% of inlet flow
97% 45% of inlet flow
98% 40% of inlet flow
99% 34% of inlet flow
99.5% 28% of inlet flow

Flow vs. Purity @ 50° C (122ºF)
(Based on 77° ambient)
  No. 2700-09B
Product Purity
No. 2700-11B
Product Purity
No. 2700-12B
Product Purity
Flow in SCFH 99% 98% 97% 95% 99% 98% 97% 95% 99% 98% 97% 95%
@ 150 psi 662 931 1188 1714 181 254 325 469 16 22 28 41
@ 135 psi 578 815 1042 1505 158 223 285 412 14 19 25 36
@ 125 psi 522 737 943 1365 143 202 258 374 12 18 22 32
@ 110 psi 437 620 795 1153 120 170 218 316 10 15 19 27
@ 100 psi 381 542 696 1012 104 148 191 277 9 13 17 24
@ 90 psi 326 465 598 871 89 127 164 238 8 11 14 21

High-Capacity Nitrogen Generator

  • Provides high-volume of 99%+ pure Nitrogen for a wide range of process requirements
  • Holding tank has 60 gallons of N2 ready to use
  • Compact housing requires a minimum amount of floor space

Terra’s HC (high-capacity) Nitrogen Generator provides a continuous flow of 99%+ Nitrogen, providing a reliable alternative to re-fillable storage tanks.

A combination compressor/dryer (included) provides the feed air for the nitrogen-producing membrane and prefilters.

Nitrogen Purity: 99%+ (depending on inlet pressure)
Power Requirements (compressor): 208/230/460 VAC, 60Hz, 3-phase, prewired for 460V operation
Power Requirements (generator): 120VAC / 240VAC
Generator Max. Power: 4kW
Footprint: 90" x 72" (generator and compressor)
Maximum height: 96"
Generator Tank Capacity N2 holding tank: 60 gal.; Compressed air storage: 200 gal.
Compressor pressure range 217 psig
Compressor Capacity 157 ACFM
Compressor Motor Power 50 HP
Compressor Dimensions 78.375"L x 40.5"W x 67"H
Compressor Weight 2,458 lb

See complete details and ordering information.
  On-Site Nitrogen Generation: The Practical, Reliable Alternative

For more and more manufacturers, on-site nitrogen membrane separation has become a preferable alternative to conventional sources of purified nitrogen (whether in liquid customer stations or nitrogen cylinders).

High-volume suppliers of purified nitrogen typically rely on the cryogenic distillation process, which provides excellent purity levels (up to 99.99%) but is energy intensive and hence inherently expensive. For occasional nitrogen requirements that demand ultra-high purity, these sources remain the most economical; but for many other applications—including most high-volume storage situations—non-cryogenic generation on-site makes better sense.

Optimal Source of Purge Gas for Glove Boxes, Desiccators, and Other Enclosures
Membrane systems can be sized to deliver as little as 100 SCFH (Standard Cubic Feet per Hour) efficiently and economically, and in most cases lead to significant savings, even when high purity levels are necessary.

For nitrogen-purged storage and process systems with automatic humidity controls (like Terra desiccators, glove boxes and automated stockers), this purity level may not even be necessary. Terra systems automatically regulate the nitrogen purge to maintain the most critical humidity levels typically required, which can generally be achieved with purity levels below the 99.99% for which you are currently paying.

Long-Term Stability, Complete Supply Control
These membrane nitrogen separators provide additional savings—and greater convenience—by eliminating the need to rent tanks and pay for delivery services. Of course, they also free you from price increases from your nitrogen distributor. Once your system is installed, you pay only minimal electricity expenses: your gas costs remain completely predictable.

And your supply remains secure. You'll never need to worry about overbuying to compensate for tight supplies or delivery disruptions.

  Complete Product Control

The purity of nitrogen, flow rate of the gas, and feed air temperature and pressure all affect the performance of the membrane separation system. By altering these variables, you can deliver nitrogen with precisely the right purity and flow for your applications.

Nitrogen purity can be regulated (up to a maximum of 99.5%) by adjusting the input air pressure and temperature. In most cases, the greatest system efficiency is achieved at purities of 95-99%, levels adequate for most cleanroom applications. See Figure 1.

The flow rate of the enriched nitrogen product is a function of the purity required. The higher the nitrogen purity required, the lower the flow rate produced, assuming constant feed air temperature and pressure. To produce a higher purity nitrogen product, more oxygen must permeate the membrane. You increase oxygen permeation by increasing the pressure difference across the membrane. This transports more gas, including more of the total oxygen content of the feed air, through the membrane. With more oxygen permeating the membrane, the oxygen level in the nitrogen product gas is reduced and purity improved.

Feed air temperature also affects the performance of the system. The higher the feed air temperature, the higher the feed air flow rate required, assuming constant air pressure and nitrogen purity. As feed air temperature rises, the membrane permeability increases, requiring an increased feed air flow rate to maintain product flow. However, feed air temperature also affects the membrane material. High feed air temperature shortens the life of the membrane. See Figure 2 for the relationship between feed air temperature and flow rate.

When the feed air temperature increases, the feed air flow required rapidly escalates. Therefore, the system must be designed to provide required feed air flow rate of the maximum anticipated feed air temperature, or an air conditioner must be used to control the feed air temperature.

Dew point is the temperature at which a given mixture of water vapor and gas is saturated. The dew point and trace contaminants of the nitrogen-enriched product gas are dependent on the water level and quality of the feed air. Operating in the purity range of 95-99% nitrogen, saturated feed air results in a product gas that contains less than 5 ppm water, depending on feed air conditions. The atmospheric dew point equivalent is -30°C (-20°F) at 95% purity, and -50°C (-58°F) at 99.9% purity.

Water level in the feed gas is dependent on temperature and pressure. Therefore, if the feed air pressure is reduced, the dew point of the product may increase. If the temperature is increased, the feed dew point increases and the product stream dew point increases. Changes in dew point are minimized by using a refrigerated air dryer to condition the feed air.

Carbon dioxide in the product stream is typically less than 0.01% operating at 99% nitrogen, 135 psig and 25°C, based on feed air containing 0.03% carbon dioxide.

File Type File Name Publication Date
White Paper (PDF) On-Site Nitrogen Generation: Cheaper, Easier, More Reliable
Learn how on-site nitrogen generation saves money by not having to order canisters of inert gas for desiccators, glove boxes and analytical instruments. You can make your own purified nitrogen from compressed air using a sophisticated membrane module (find out how it works!).
Manual (PDF) Nitrogen Generator: Doc. # 1800-47
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