Gas experts tell you: what is a standard gas?
In the industry, standard gases are generally referred to as standard gas mixtures. A standard gas is a standard material. Standard material is highly uniform, good stability and accurate determination of the standard value, they have the repetition, save, and basic function of the value, in the field of physics, chemistry, biology and engineering measure for calibration of measuring instruments and measurement process, the accuracy of the evaluation method of measurement and testing laboratory detection ability, determine the characteristic value of material or product, quantity values of arbitration and so on.
According to the gas group fraction, the standard gas is divided into binary, ternary and multivariate standard gas. The calibration of the valve must be characterized by the allowance of the valve and the allowance of the analysis. The preparation method can be gravimetric, and then checked by chromatographic analysis, or according to the standard transfer procedures for transmission.
In large ethylene plant, ammonia plant and other petrochemical enterprises, dozens of kinds of pure gas and hundreds of kinds of multi-component standard mixture are needed in the process of starting up, stopping and normal production of the equipment, so as to calibrate and calibrate the on-line analytical instruments used in the production process and the instruments to analyze the quality of raw materials and products.
Standard gases are also widely used in environmental monitoring, such as toxic organic matter measurement, vehicle emission gas test, natural gas BTU measurement, LPG calibration standard, supercritical fluid process, etc.
The medical industry also USES a lot of standard gases for blood tests, lung function tests, and many operations use excimer laser gases.
Standard gases are usually made on demand and are usually ready to go. The process of gas distribution must also be carried out in accordance with strict procedures. After the preparation of each bottle of gas, it is necessary to check whether it meets the standard. A bottle of high-quality standard gas needs time to be tested.