The origin and development of metal element analyzers At present, when users of domestic metallurgy, foundry, and machinery industries analyze the trace elements other than carbon and sulfur in metal materials, the following types of instruments can be used:
1. spectrum analyzer. The advantage is that multiple elements can be analyzed at a time with high precision. The disadvantage is that the price is too high, a set of hundreds of thousands to millions, so there are only a few large companies to use, the main spark direct reading spectrometer, portable spectrometer. 2. Spectrophotometer. The advantage is that the detection wavelength is easy to choose and the price is not high. The disadvantage is that the test result can not be directly displayed (to be converted); there is no curve to establish the call function, detection of different elements every time to re-calibration; the cuvette into and out of the liquid is inconvenient; the basic knowledge of the operator's chemical analysis requirements Therefore, it cannot meet the needs of on-site on-line inspection and analysis.
3. Colorimetric analyzer. The advantage is that it is easy to use, the price is not high, and the operator's chemical analysis basis is not very demanding. Therefore, it is widely used in the production inspection field analysis. However, because of its historical reasons, there are the following congenital defects.
Photoelectric colorimetric element analyzer was developed in China in the 1960s to meet the needs of online on-line detection and analysis of five major elements (carbon, sulfur, silicon, manganese, and phosphorus) of iron and steel metallurgy. At that time, carbon and sulfur were detected using carbon-sulfur analyzers, and silicon, manganese, and phosphorus were measured. An elemental analyzer (three elements at the time, three channels were fixed at predetermined wavelengths to detect silicon, manganese, and phosphorus, respectively) was used. Silicon, manganese, and phosphorus were used. The wavelength required for the detection is not large, and the accuracy is not high. Therefore, the three-element analyzer satisfies the need for online on-line analysis of elemental content in the iron and steel metallurgy industry. But now, all industries need to detect materials other than steel, copper alloys, aluminum alloys, and zinc alloys. The elements examined also evolve from silicon, manganese, and phosphorus to copper, chromium, nickel, zinc, magnesium, tungsten, vanadium, and niobium. , Titanium, molybdenum, aluminum, arsenic, zirconium, boron, rare earth elements and other elements, the following defects commonly found in traditional photoelectric colorimetric elemental analyzers are increasingly manifested:
1. The measuring wavelength is fixed by default and cannot be adjusted continuously. Although some models can be replaced (by replacing filters or light emitting diodes), it is still cumbersome for the user, and it is necessary to measure the types of elements that exceed the number of channels of the instrument or to It is particularly inconvenient when testing different alloy materials. And not all wavelength filters and LEDs can be purchased, making it difficult to measure certain elements. For example, the measurement of magnesium requires a 576-nm light source, and filters and LEDs of this wavelength are not available.
2. The measurement light source is mostly a DC bulb plus a filter or a cold light emitting diode, and its wavelength accuracy is poor. The wavelength accuracy of the DC bulb plus filter method depends on the filter, and most of the filter elements used in the elemental analyzer can only achieve ±15 nm. The wavelength accuracy of light emitting diodes depends on the diodes used. Most of the errors range from 20 to 30 nm, which does not guarantee the accuracy of analysis and detection.
The application of new materials and new technologies requires the types of elemental analysis in various industries to be more demanding. Faced with the inherent defects and market pressures of traditional elemental analyzers, many manufacturers have adopted the following countermeasures:
1. Increase the number of instrumental analysis channels, ie increase the number of preset fixed wavelengths, thereby increasing the number of elements that can be detected;
2. For predetermined different uses, different fixed wavelengths are preset so as to form different types of elemental analyzers that detect different materials and different elements respectively.
1. spectrum analyzer. The advantage is that multiple elements can be analyzed at a time with high precision. The disadvantage is that the price is too high, a set of hundreds of thousands to millions, so there are only a few large companies to use, the main spark direct reading spectrometer, portable spectrometer. 2. Spectrophotometer. The advantage is that the detection wavelength is easy to choose and the price is not high. The disadvantage is that the test result can not be directly displayed (to be converted); there is no curve to establish the call function, detection of different elements every time to re-calibration; the cuvette into and out of the liquid is inconvenient; the basic knowledge of the operator's chemical analysis requirements Therefore, it cannot meet the needs of on-site on-line inspection and analysis.
3. Colorimetric analyzer. The advantage is that it is easy to use, the price is not high, and the operator's chemical analysis basis is not very demanding. Therefore, it is widely used in the production inspection field analysis. However, because of its historical reasons, there are the following congenital defects.
Photoelectric colorimetric element analyzer was developed in China in the 1960s to meet the needs of online on-line detection and analysis of five major elements (carbon, sulfur, silicon, manganese, and phosphorus) of iron and steel metallurgy. At that time, carbon and sulfur were detected using carbon-sulfur analyzers, and silicon, manganese, and phosphorus were measured. An elemental analyzer (three elements at the time, three channels were fixed at predetermined wavelengths to detect silicon, manganese, and phosphorus, respectively) was used. Silicon, manganese, and phosphorus were used. The wavelength required for the detection is not large, and the accuracy is not high. Therefore, the three-element analyzer satisfies the need for online on-line analysis of elemental content in the iron and steel metallurgy industry. But now, all industries need to detect materials other than steel, copper alloys, aluminum alloys, and zinc alloys. The elements examined also evolve from silicon, manganese, and phosphorus to copper, chromium, nickel, zinc, magnesium, tungsten, vanadium, and niobium. , Titanium, molybdenum, aluminum, arsenic, zirconium, boron, rare earth elements and other elements, the following defects commonly found in traditional photoelectric colorimetric elemental analyzers are increasingly manifested:
1. The measuring wavelength is fixed by default and cannot be adjusted continuously. Although some models can be replaced (by replacing filters or light emitting diodes), it is still cumbersome for the user, and it is necessary to measure the types of elements that exceed the number of channels of the instrument or to It is particularly inconvenient when testing different alloy materials. And not all wavelength filters and LEDs can be purchased, making it difficult to measure certain elements. For example, the measurement of magnesium requires a 576-nm light source, and filters and LEDs of this wavelength are not available.
2. The measurement light source is mostly a DC bulb plus a filter or a cold light emitting diode, and its wavelength accuracy is poor. The wavelength accuracy of the DC bulb plus filter method depends on the filter, and most of the filter elements used in the elemental analyzer can only achieve ±15 nm. The wavelength accuracy of light emitting diodes depends on the diodes used. Most of the errors range from 20 to 30 nm, which does not guarantee the accuracy of analysis and detection.
The application of new materials and new technologies requires the types of elemental analysis in various industries to be more demanding. Faced with the inherent defects and market pressures of traditional elemental analyzers, many manufacturers have adopted the following countermeasures:
1. Increase the number of instrumental analysis channels, ie increase the number of preset fixed wavelengths, thereby increasing the number of elements that can be detected;
2. For predetermined different uses, different fixed wavelengths are preset so as to form different types of elemental analyzers that detect different materials and different elements respectively.
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