Standard gas belongs to standard substance. Reference materials are highly uniform, well stable and accurate measurement standards. They have the basic role of reproducing, saving and transferring quantity values. They are used in the fields of physics, chemistry, biology and engineering measurement to calibrate measuring instruments and measurement processes, evaluate the accuracy of measurement methods and the detection capability of testing laboratories, determine the characteristic quantity values of materials or products, and arbitrate quantity values.

With the rapid development of economy and science and technology, the demand for standard gases has increased dramatically. It is widely used in oil and gas development, chemical industry, fertilizer industry, public security and transportation, national defense and aviation, building and household, environmental monitoring, scientific research and other fields. In particular, various environmental monitoring (including atmospheric environment, building and home environment, etc.), petrochemical industry, public security and transportation departments. According to incomplete statistics, the total value of standard gas required in the ethylene industry of Sinopec alone is more than 40 million yuan every year.

As the measurement standard of gas composition, standard gas plays a unique role in regulating and ensuring quality in the application of gas production, trade, petrochemical and other industries, and can produce huge economic and social benefits. The functions and uses of standard gases can be summarized as follows.

1、 Function of standard gas

(1) ) Establish the traceability of measurement. The gas reference materials have good homogeneity and stability, can preserve the chemical composition and characteristic values of the materials, and transfer their values in different spaces and times. Therefore, the traceability of measurement can be obtained by using standard gas for various actual measurement results.

(2) Ensure the accuracy and consistency of the test results. The standard gas can be used to calibrate or verify the quality of the measurement process and various measurements, so as to ensure the consistency of measurement results in different time and space.

(3) Transfer the quantity value. The standard gas is a means to transfer the quantity value and achieve consistent measurement results. The values of the basic units of the International System of Units are transferred to the actual measurement through standard gases of different grades in order to ensure the accuracy of the measurement results.

(4) Promote the development of measurement technology and quality supervision. Standard gas plays an important role in ensuring the consistency of product quality and inspection results, and ensuring the scientificity, authority and impartiality of technical supervision. The type identification of new instruments, metrological certification of quality inspection institutions, laboratory accreditation, and the formulation, verification and implementation of national and industrial gas product standards are inseparable from standard gases.

2、 Use of standard gas

(1) It is used for quality control of gas products. In order to ensure that the quality of produced gas products conforms to national standards or industrial standards, daily supervision and inspection must be carried out on the products regularly. Most gas analysis instruments are relative measurement instruments, and standard gas must be used as quantitative standard to ensure the accuracy of measurement results.

(2) It is used for the verification and calibration of instruments and meters. The modern production process, from the inspection of raw materials, the control of production process to the inspection and evaluation of product quality after * * *, can not be separated from various instruments and meters. In order to ensure high-quality production, it is necessary to regularly use various standard gases to verify or calibrate its instruments and meters, especially after long-term use and repair of online instruments and meters, it is more necessary to use standard gases to calibrate the scale.