Brief introduction of BET specific surface area analyzer
The BET specific surface area analyzer is a detection and analysis instrument for the specific surface area of ​​powder and granular materials. It is jointly developed by Jinai Spectrum Technology and Weapon System. The product design follows international standards, and fully realizes the integration of manufacturing, functional modularization, operation automation and intelligence. Significantly improve product reliability, test results accuracy, and greatly save the workload of testers. Can be used for metal oxide BET specific surface area analysis, catalyst material BET specific surface area analysis, calcium carbonate BET specific surface area analysis, etc., widely used in colleges and universities Research on materials of scientific research institutes and product quality control of powder material production enterprises.
Performance parameters of automatic BET specific surface area analyzer
Test method and function of BET specific surface area analyzer: Nitrogen adsorption vacuum volume method (vacuum static method), adsorption and desorption isotherm measurement, BET method specific surface area measurement (single and multi-point), Langmuir method specific surface area measurement, average particle size Diameter estimation, determination of true density of sample, determination of external specific surface area by t-plot method
Measurement range of BET specific surface area analyzer: 0.01 (㎡ / g)-to no upper limit (specific surface area)
Measurement accuracy: repeatability error is less than 1.5%
Vacuum system of BET specific surface area analyzer: V-Sorb's original cartridge pipeline and solenoid valve control system greatly reduces the dead space of the pipeline, improves the sensitivity of detecting small changes in adsorbed gas, and thus improves the resolution of specific surface area measurement ; At the same time, the cartridge pipeline reduces the connection points, greatly improving the sealing and the service life of the instrument.
BET specific surface area analyzer liquid level control: V-Sorb's original liquid nitrogen surface control system ensures that the position of the liquid nitrogen surface relative to the sample tube remains unchanged throughout the test, completely eliminating measurement errors introduced by changes in dead volume
BET specific surface area analyzer control system: using programmable controller solenoid valve control system, high integration and anti-interference ability, improve instrument stability and service life.
Number of samples: simultaneous analysis of 2 samples and degassing of 2 samples
BET specific surface area analyzer pressure measurement: Imported dual pressure sensor with pressure segment measurement significantly improves test accuracy at low P / Po points, 0-1000 Torr (0-133Kpa), 0-10 Torr (0-1.33Kpa) (Optional)
BET specific surface area analyzer pressure accuracy: imported silicon thin film pressure sensor, the accuracy reaches 0.15% of the actual reading, better than 0.15% of the full range, much higher than the accuracy of the Pirani resistance vacuum gauge (general error is 10% -15%)
Partial pressure range: P / Po accurate controllable range up to 5x10ï¼0.6ï¼0.995
Ultimate vacuum: 4x10ï¼2Pa (3x10ï¼4Torr)
Sample type: powder, granule, fiber and sheet material, etc.
BET specific surface area analyzer test gas: high-purity N2 gas (99.999%) or other (select according to need such as Ar, Kr)
Data acquisition: high-precision and highly integrated data acquisition module, small error, strong anti-interference ability.
BET specific surface area analyzer data processing: Windows compatible data processing software, complete functions, simple operation, multi-mode data analysis, graphical data analysis results report.
Features of automatic BET specific surface area analyzer
A. Vacuum system of BET specific surface area analyzer
1) The original integrated containerized pipeline system uses imported container pipelines, which significantly reduces pipeline connection points, greatly reduces the air leakage rate, and improves the ultimate vacuum.
2) Modular structure design, integrated manifold piping, few parts that need to be manually connected, which is conducive to configuration according to user needs and later function expansion, which is conducive to maintenance and replacement.
3) The Sino-German joint venture vacuum pump is used, with low noise, stable operation, excellent oil-proof return function, high ultimate vacuum, up to 4x10-2Pa (3x10-4Torr)
B. Control system of BET specific surface area analyzer
1) A programmable controller solenoid valve control system widely used in industrial control systems is adopted, which has strong anti-interference ability, greatly improved stability, and is very convenient for installation and disassembly;
2) The unique design of the separation structure of the test system pipeline and the sample processing pipeline effectively prevents the contamination of the test pipeline caused by impurities generated during the sample processing.
C. BET specific surface area analyzer measures to improve test accuracy
1) Adopt high-precision silicon thin-film pressure sensor of the same brand as similar imported products, and the pressure measurement accuracy is 0.15% of the corresponding reading, which is far better than 0.15% of full-scale accuracy (FS) sensor;
2) Similar to similar foreign products, using 0-10 Torr (optional) and 0-1000 Torr dual pressure sensors, the pressure within the test range is measured in sections, which greatly reduces the measurement error under low vacuum, 0-10 Torr (may (Optional) The precision of the silicon thin film pressure sensor is much higher than the Pirani resistance vacuum gauge with the same range (general error is 10% -15%);
3) The original integrated containerized pipeline system adopts imported container pipelines, which significantly reduces pipeline connection points and greatly reduces dead volume space, which is conducive to reducing measurement errors;
4) The original stepped liquid nitrogen surface control system ensures that the position of the liquid nitrogen surface relative to the sample tube remains unchanged throughout the test, completely eliminating the measurement errors introduced by the change in dead volume;
5) The uniquely designed pumping and intake control system effectively prevents the sample from evacuating and splashing during the intake process, ensures the cleanliness of the test gas path and no loss of sample quality, and protects the high-precision pressure sensor from possible pressure changes. Zero point and linear drift.
D. Data collection and processing of BET specific surface area analyzer
1) Adopt high-precision and high-integration data acquisition module, convenient connection, small error, and anti-interference ability; adopt industry standard 485 communication mode, which is conducive to equipment expansion and interconnection, and can be easily converted to RS232 and USB communication mode;
2) A variety of theoretical calculation model data analysis to provide users with a full range of material analysis solutions; powerful test data archiving and query system, which is conducive to user data management.
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