Calibration Gas Mixture Cylinder
Calibration gas mixture is a gas consisting of pure gases - components of the mixture, in specified ratios. Calibration gas mixtures are obtained by precise dosing and subsequent mixing of pure gases - components. Pure industrial gases such as oxygen (O2), hydrogen (H2), nitrogen (N2), air, methane (CH4), nitrogen oxide (NO), nitrogen dioxide (NO2), carbon monoxide (CO), carbon dioxide (CO2), argon (Ar) and others in different ratios from 0.001 to 99% are used for the production of calibration gas mixtures.
APPLICATION:
• for metrological verification, calibration and calibration of gas analysis equipment and systems; • for certification of measurement procedures for the content of various components of gaseous media; • to control the accuracy of measurement results performed with all-purpose analyzers (mass spectrometers, gas chromatographs, etc.). The calibration gas mixture is stored and transported in metal cylinders. The cylinders are grey-painted and marked with the inscription "CALIBRATION GAS MIXTURE" in black color or with a black diamond-shaped pattern with the letters "CGM" inside; depending on the properties of the mixture, yellow, red, blue, or green stripes may also be applied to the cylinders. Requirements for transportation, storage and use of cylinders for calibration gas mixture are established by the Federal standards and regulations in the field of industrial safety "Regulations of industrial safety for hazardous facilities using equipment operating under excessive pressure", GOST R 8.776-2011 "State System for Ensuring the Uniformity of Measurements (SSM). Reference standards for gas mixtures. General metrological and technical requirements", fire safety standards, as well as other laws and regulations and international agreements in force on the territory of the Russian Federation.Cylinders are not hazardous cargo until they are taken into use, but in any case they should be transported in conditions that exclude mechanical damage. Cylinders filled with calibration gas mixture shall be transported by rail, road, river, sea and air transport in accordance with the regulations on carriage of dangerous goods, applicable to the relevant mode of transport. The cylinders must be transported with caps screwed on.
Cylinders designed for storage and transportation of a calibration gas mixture must not be used for storage and transportation of other gases, and it is prohibited to perform any operations that may contaminate their internal surface and degrade the physical and chemical properties of the gas. It is forbidden to make any modifications to the cylinder bodies using welding or mechanical tools, which can lead to damage to the integrity or appearance of defects that degrade the technical characteristics of the cylinders. It is forbidden to change the marking of cylinders, to repaint them, as well as to transfer the calibration gas mixture into other cylinders. When using and storing cylinders for calibration gas mixture it is not allowed to install them in the places of people passage, movement of goods and passage of vehicles. Cylinders must be located at least 1 m away from radiators and other heating devices and at least 5 m from heat sources with open flame. Many components of calibration gas mixtures are themselves explosive and flammable or toxic substances, therefore premises with a potential risk of accumulation of these components must be provided with uninterrupted functioning ventilation. Cylinders filled with a calibration gas mixture and stored at a temperature below 15 °С must be kept in a room with air temperature (20±5) °С for 24 hours before use. The gas in the cylinders must not be completely consumed when in use. The residual gas pressure in the cylinder must be at least 0.05 MPa (0.5 kgf/cm2).
Cylinders filled with calibration gas mixture are stored in special warehouses or in outdoor areas under a shelter that protects the cylinders from precipitation and direct sunlight. Cylinders with oxygen and calibration gas mixtures containing combustible gases must not be stored in the same room. Storage of cylinders should be carried out with the caps screwed on.