Gemini

Category BET Specific Surface Area Tag BET Specific Surface Area

Balance-tube design – precise measurement of BET surface area with nitrogen without the need for krypton, with the fastest available gas dosing

Balance-tube design eliminates freespace errors – no need for a subsequent measurement
Measures very low surface areas with nitrogen, without the need for krypton
Adaptive rate dosing – the fastest available gas dosing, shorter total analysis time
Three models: 2390a (BET/Langmuir/t-Plot), 2390p (+ Po tracking), 2390t (+ larger dewar, full isotherm up to 1000 points, BJH/DH)

Operation via built-in software (no PC needed, via keypad) or Gemini Windows software; Confirm™ option for 21 CFR Part 11 (regulated pharmaceutical environment)
Up to 4 instruments simultaneously from one computer (Windows software)
t-Plot (Halsey, Harkins-Jura, Carbon Black STSA), Horvath-Kawazoe; BJH/DH pore size distribution available on 2390p/2390t
Typical applications: routine QC surface area of powders, activated carbon (STSA per ASTM D6556/ISO), pharmaceuticals, catalysts

Surface area	from 0.1 m² total · from 0.01 m²/g specific
Pore volume	from 4 × 10⁻⁶ cm³/g
Pressure measurement	0-950 mmHg · P/P0 resolution <10⁻⁴
Gases	nitrogen (standard); argon, CO2, butane, methane and other non-corrosive gases/vapors; helium for free space
Dewar	~8 h (2390a/2390p) · ~24 h (2390t)
Dimensions	H 59 cm (2390a/2390p) or 74 cm (2390t) × W 40 cm × D 51 cm · weight 32-35 kg
Power	85-265 VAC, 50/60 Hz, 150 VA

Source: micromeritics.com/products/gemini and the Gemini VII 2390 brochure (Micromeritics, internal archive).

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