Zero Air Generator

Zero Air Generator GNG-01

is designed for receiving zero air with normalized content of the following impurities: Nitric Oxide (NO), Nitrogen Dioxide (NO2), Ozone (О3), Sulfur Dioxide (SO2), Hydrogen Sulfide (H2S), Ammonia (NH3), Carbon Monoxide (СО) and Hydrocarbons (CH). The GNG-01 can be used for calibration and verification of gas analyzers for monitoring of ambient air, the air of the working area, also it can be used as a diluent gas for dynamic and thermodiffusion generators of different calibration gas mixtures.

Generator is a working standard of the 1st Grade in compliance with the State hierarchy scheme for measuring instruments of the content of components in gaseous mediums (GOST 8.578-2008).


Generators are included to the State Register of measuring instruments of RF № 26765-15.



Generator GNG- 01 is a stationary device, executed in the form of two blocks: the compressor and the purification. Compressor unit carries out air intake, pre-treatment of solids, drying, cooling, condensate drainage and maintaining constant pressure at the outlet of system. The purification unit filters pressurized air with special scrubbers (filters) from background impurities and dust from a reactor.



Pressurized air that came out from the compressor and has an increased relative humidity, is cooled in serpentine cooler. Condensate is separated and removed to the outside through a special filter. Then partially dehumidified air flows into the receiver, which is used to maintain constant pressure. Then air goes on dehumidifier, which is filled with aluminium oxide, where separation from moisture and purification from solids is carried out.

Through the reducer that regulates outlet pressure of the generator air is fed into the purification unit where Nitrogen Oxides, Sulfur Dioxide, Ozone, Hydrogen Sulfide, and Ammonia are removed.

At the final stage dry air flows through the reactor heated to 250 °С for catalytic oxidation of carbon monoxide CO and hydrocarbons to carbon dioxide CO2. Then purified dry air flows through the granular filter, which entraps particles larger than 10 microns.



Usage of the Generator allows to reduce or even to exclude application of zero-grade calibration gases in cylinders under pressure.

Purification of zero air from a wide range of impurities.

Possibility to use the generator off-line as a part of automatic calibration of environmental monitoring stations.

Long-term operation without replacementof the filter elements.


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Impurities in zero air, max (ppm vol.)

Nitric Oxide (NO)


Hydrocarbons in terms of methane



Carbon Oxide (CO)


Ammonia (NH3)


Ozone (О3)


Nitrogen Dioxide NO2



Limits of permissible relative error to maintain pressure during 8 hours of continuous operation

±25 kPa

Moisture dew point temperature at the output of the generator

– 20±5 °C

Warm-up time, max

30 min

Period of non-stop work of generators without replacement filters purification unit

not less 1 year

Power supply from AC

220 V, 50 Hz

Dimensions of generator units,


– compressor unit 700x500x700 mm

– purification unit 515x400x330 mm

Weight of generator units, max:

– compressor unit 50 kg

– purification unit 7 kg

Operating Conditions

Ambient temperature от 15 до 25 от 30 до 80 при 25 °

from 15 to 25 °C

Atmospheric pressure

from 98,0 to 104,6 kPa

Relative humidity

from 30 to 80 % at 25 °C

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