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The modern production process, from the inspection of raw materials, the control of the production process, to the inspection and evaluation of the final product quality, is inseparable 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, especially after long-term use and repair of online instruments, it is necessary to use standard gases to calibrate the scale. Various standard gases for calibration are as follows:
Component name | Content | Use | |
Methane in the air | 10×10-6，1% | Gas Chromatograph | |
Methane in hydrogen | 1% | ||
Methane in nitrogen | 100×10-6，1% | ||
Carbon dioxide, propane | 10×10-6，1% | ||
Carbon monoxide in nitrogen, Carbon dioxide, propane | CO | 0.5%～5% | Automobile emission analyzer |
CO2 | 0～14% | ||
Propane | 800×10-6～1.2% | ||
Sulfur hexafluoride in nitrogen | 0～6000×10-6 | Sulfur hexafluoride leak detector, sulfur hexafluoride analysis instrument | |
Nitric Oxide in Nitrogen | 0～1000×10-6 | Automobile emission analyzer, chemiluminescence nitrogen oxide analyzer | |
Oxygen in Nitrogen | 10×10-6～21% | Oxygen analyzer | |
Hydrogen sulfide in nitrogen | 0～20% | Hydrogen sulfide gas analyzer | |
Isobutane in the air | 0～1.2% | Combustible gas detector | |
Carbon monoxide in nitrogen | 0～10% | Carbon monoxide analyzer, flue gas analyzer | |
Carbon dioxide in nitrogen | 0～50% | Carbon dioxide analyzer, flue gas analyzer | |
Carbon dioxide in nitrogen | 0～20% | Carbon dioxide gas alarm, flue gas analyzer | |
Methane in the air | 0～10% | Optical interference or methane tester, catalytic combustion methane tester | |
Hydrogen in Nitrogen | 0～50% | Hydrogen analyzer | |
Ammonia in Nitrogen | 0～30% | Ammonia analyzer | |
Alcohol in the air | 0～100×10-6 | Alcohol alarm | |
The role of standard gas
(1) Establish traceability of measurement. The gas standard substance has good uniformity and stability, can preserve the chemical composition and characteristic value of the substance, and transfer its value in different spaces and times. Therefore, through the application of standard gas, various actual measurement results can be traced to the source of measurement.
(2) Promote the development of measurement technology and quality supervision. Standard gases have played an important role in ensuring the consistency of product quality and inspection results, and ensuring the scientific, authoritative and impartiality of technical supervision. Standard gases are inseparable from the type appraisal of new instruments, the measurement certification of quality inspection agencies, laboratory accreditation, and the formulation, verification and implementation of national and industry gas product standards.
(3) Carrying out the transfer of the value. Standard gas is a means to transfer the value and achieve consistent measurement results. Through different grades of standard gases, the value of the basic unit of the International System of Units is transferred to the actual measurement in order to ensure the accuracy of the measurement result.
(4) Ensure that the test results are accurate and consistent. 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 the measurement results in different time and space.
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