What is First Grade Standard Gas?

First grade standard gas plays an important role in scientific research and industrial applications due to its high accuracy and stability.

The first grade standard gas is the highest level of measurement carrier in the national gas reference material.

As the highest level of standard gas, the first level standard gas has the following characteristics:

- Determination method: The determination of first grade standard gas is usually carried out by absolute measurement method or accurate and reliable method combining more than two different principles. This method ensures the high accuracy and reliability of its determination.

-Stability: The stability of first grade standard gases is very high, which means that they are able to maintain their characteristics over a long period of time, which is essential to ensure the consistency of long-term measurement results.

- Scope of application: Primary standard gas is suitable for the measurement of key quality parameters, such as the calorific value of natural gas and other important indicators, which is of great significance for accurate measurement in scientific research and industrial production.

What is second grade standard gas?

Second grade standard gases play an important role in daily inspection and calibration, and although they are less accurate and stable than primary standard gases, they are still able to meet most measurement needs.

Second grade standard gas is a gas reference material used for daily calibration.

Second standard gas is different from first grade standard gas in terms of preparation method, accuracy and stability. Specific analysis is as follows:

1. Preparation method: the preparation of second grade standard gas can be absolute method, or by comparing with the method of the upper level reference material to determine the value. This represents that the preparation process of second grade standard gas is relatively flexible, and it can be operated according to the specific situation to select the appropriate value method.

2. Accuracy and stability: although the accuracy and uniformity of second grade standard gas are not up to the level of first grade standard gas, they can meet the needs of general measurement. The stability of second grade standard gases is usually more than half a year, or can meet the actual measurement needs, which means that they have relative reliability in practical applications.

3. Scope of application: although the second grade standard gas can not fully achieve the high precision of the first grade standard gas, it can also meet the general measurement needs to a certain extent, especially in the case of the scarcity of the first grade standard gas, the second grade standard gas has become an important tool in daily testing.

4. Other characteristics: Like first grade standard gas, second grade standard gas is also a kind of reference material. They can be in the form of binary, ternary or multivariate standard gas. Standard gas is used as the standard reference material of gas state, including high purity standard gas and mixed standard gas.

What is the difference between first grade and second grade gas?

There are significant differences in accuracy and other aspects between first and second grade standard gases, which make them suitable for different measurement occasions and requirements. In practice, it is very important to select the appropriate grade of standard gas to ensure the accuracy and reliability of the measurement results.

There are differences in the determination method, accuracy and stability between the first and second grade standard gas. Specific analysis is as follows:

1. Determination method: The first grade standard gas usually adopts absolute measurement method or more than two different principles of measurement method for determination, while the second grade standard gas may only use one measurement method.

2. Accuracy: The first grade standard gas has the highest accuracy and is suitable for the measurement of key quality parameters, such as the calorific value of natural gas and other important indicators. In contrast, although the accuracy of the second grade standard gas is not as good as the first grade standard gas, it can meet the general measurement needs.

3. Stability: The higher stability of the first grade standard gases means that they have a greater ability to maintain their characteristics over a long period of time, which is essential to ensure the consistency of long-term measurement results.