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Test principal: Continuous Flow Chromatography method, Low temperature nitrogen adsorption

Test methods: Direct Comparison method

Gas: mixed gas of high purity nitrogen and helium (The proportion of nitrogen and helium is 3/7; and gas purity is 99.999%).

Flow control: automatic control program, P / Po 0.05 - 0.35, control accuracy error ≤ 0.5%;

Measuring range:  Surface area ≥ 0.01m2/g, no upper limits;

Sample NO:   one standard sample and 3 samples tested

Test Efficiency:    Direct comparison measures specific surface area: 15 minutes for three samples

Repeatability Accuracy:  ≤ ±1 %

Data acquisition: high-precision data acquisition and processing chip, high anti-interference ability.