Gas mixtures of Series G
Gas mixtures of Series G are a set of standard gas mixtures that are used to calibrate gas analyzers. They are produced by the National Institute of Standards and Technology (NIST) and are available in a variety of compositions.
The gas mixtures of Series G are named after the type of gas that they contain. For example, G1 is a mixture of methane and ethane, G2 is a mixture of propane and butane, and G3 is a mixture of carbon monoxide and nitrogen.
The gas mixtures of Series G are produced in a variety of concentrations. For example, G1 is available in concentrations of 10%, 20%, 30%, and 40% methane.
The gas mixtures of Series G are used to calibrate gas analyzers by injecting a known volume of the mixture into the analyzer. The analyzer is then used to measure the concentration of the gas in the mixture.
The gas mixtures of Series G are an important tool for ensuring the accuracy of gas analyzers. They are used by a variety of industries, including the oil and gas industry, the chemical industry, and the environmental industry.
Here is a table of the gas mixtures of Series G:
Gas Mixture Type of Gas Concentration:
G1Methane and ethane10%, 20%, 30%, 40%G2Propane and butane10%, 20%, 30%, 40%G3Carbon monoxide and nitrogen10%, 20%, 30%, 40%G4Hydrogen and nitrogen10%, 20%, 30%, 40%G5Oxygen and nitrogen20%, 30%, 40%, 50%
Sepehr Gas Kavian Company produces G series compounds with ISO17025 certificate.
| Gas brand | components | Application |
| G110 | CH4 * 24% N2 *50%H226% | Reference gas, limit gas / incomplete combustion, flame jump and soot-generating limit gas |
| G112 | CH4 * 24% N2 *59%H217% | Limiting gas/flame elongation |
| G21 | 13% C3H8 * 87% CH4 | Limit gas of incomplete combustion and soot |
| G222 | H2* 77% CH423% | Limiting gas/flame elongation |
| G23 | N2* 92.5% CH47.5% | Limiting gas/flame elongation |
| G25 | N2* 86% CH414% | Reference gas and limit gas in flame elongation |
| G26 | C3H8 * 13% N2 *80%CH47% | Limit gas of incomplete combustion and limit gas of soot |
| G27 | N2* 82% CH418% | Flame jump limit gas |
| G231 | N2* 85% CH415% | Flame jump limit gas |
Gas mixtures of Series G, G series mixed gas standards
The main ingredient of natural gas is methane and its other components are carbon dioxide, hydrogen, nitrogen and some other hydrocarbons. The amount of each component is effective on the amount of heat that can be produced from the fuel.
For this reason, it is very important to determine the energy consumption of each type of heating device. All equipment that uses natural gas is tested with different combinations of natural gas to test performance and overall heat production.
These test gases must comply with international and national standards. For Europe this standard is EN437.
Gas mixtures of Series G, Series G calibration gas types
An example of a test gas conforming to the EN 437 standard is the calibration gas G23. This gas is a common substitute for natural gas in Europe.
Calibration gas G20, G21, G30, G31 are other examples of these gas mixtures. One of the most used combined gas of G series is G20 and G21 gas.
