The BSD-660 specific surface area and microporosity analyser is designed to measure the surface area of a material per unit mass, pore volume, and pore size distribution. The instrument records the amount of gas adsorbed onto the sample surface at different pressures and uses these data to calculate the specific surface area using the BET method. It is used to characterise cathode and carbon materials, zeolites, metal–organic frameworks (MOFs), catalysts, and other porous samples.

In mineral processing, the BSD-660 is used to investigate grinding products, flotation concentrates, and tailings. Measurements of specific surface area and porosity help assess the effects of processing on material properties and predict material reactivity during the hydrometallurgical leaching of heavy, rare-earth, and precious metals.

Depending on the configuration, the instrument has 3, 6, 9, or 12 analysis ports. The measurable pore size range is 0.35–500 nm for the micropore analysis station and 2–500 nm for the mesopore analysis station. The minimum measurable specific surface area is as low as 0.01 m²/g, and the minimum measurable pore volume is 0.001 cm³/g. The relative pressure range P/P₀ extends from 10^-8 to 1 for the micropore analysis station and from 10^-5 to 1 for the mesopore analysis station. Nitrogen, argon, krypton, carbon dioxide, and other non-corrosive gases can be used as adsorptives.

Before measurement, adsorbed substances are removed from the sample by degassing at temperatures ranging from room temperature to 400 °C. The vacuum system achieves pressures as low as 10^-2 Pa with a mechanical pump and 10^-8 Pa with a turbomolecular pump. A 3 L Dewar vessel enables cryogenic measurements lasting more than 90 hours, while the temperature-controlled water bath operates over a range of −10 to +80 °C. The relative standard deviation (RSD) of measurements on reference materials is less than 0.5%.