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BELsorp - max.

BELsorp - mini II.

BELsorp - aqua.

BELsorp - HP.

BELCAT range.

BEL - METAL - 3.

BELsorp - BG.






Automatic specific surface area/pore size distribution measurment



This instrument is our high-end volumetric gas adsorption instrument. To obtain useful information about micropore, it is important to measure adsorption isotherm from low relative pressure with accuracy. The BELSORP-max is designed for wide range adsorption isotherm for surface area and pore size distribution analysis. It can measure adsorption isotherms from relative pressure as low as 1 x10-8 (N2 at 77K, Ar at 87K), using a 13.3Pa pressure transducer. Also AFSM, the new method for free space measurement, is applied and adsorption isotherm can be measured with high accuracy. Chemisorption option enables unattended chemisorption measurement from pretreatment with step programs.



- Specific surface area, pore size distribution, vapor adsorption and chemisorption (OP) can be measured.  


- Adsorption measurement from extremely low pressure (p/p0=10-8– 0.997) .


- Up to 3 samples can be measured simultaneously.


- Fully automated chemisorption option is available.  


- Kr adsorption is available for low surface area material.


- Coolant level controller is no longer necessary and high reproducible data can be obtained (AFSM).


- BELSim, which analyze the pore size distribution by NLDFT and GCMC simulation method can be incorporated into the powerful data analysis software, BELMaster.


- ISO 9277 and JIS Z 8830 compliant



Measuring principle:

Volumetric gas adsorption method+AFSM



N2, Ar, Kr, NH3, CO2, H2, CO, O2, CH4 and other non-corrosive gases, H2O, MeOH, EtOH, C6H6 and other non-corrosive vapor

Analysis port:

STD mode (p/p0=10-4 – 0.997) 3 ports

High accuracy mode (p/p0=10-4 – 0.997) 2 ports

High accuracy mode (p/p0=10-8 – 0.997) 1 port (OP : 2 ports)


Specific surface area:

0.01m2/g and above (N2/77K)

0.0005 m2/g and above (Kr/77K)


Pore size distribution:

0.35 - 500 nm in pore diameter


Pressure transducer:

133 kPa (1000Torr) ± 0.5 % of F.S. ×5 units

13.3kPa (10Torr) ± 0.5% of R. ×2 units (OP : 3 units)

0.0133kPa (0.1Torr) ± 0.15% of R. ×1 units (OP : 2 units)


Manifold block oven: 40 ˚C


Dewar vessel Volume: 2.6L


Holding time: 60H


Sample cell Approx.: 1.8cm3 (Option: 5 cm3)


Vacuum pump Turbo molecular drug pump + Fore vacuum pump(OP)

Ultimate vacuum: 6.7 x 10-7 Pa and below

Vacuum gauge Pirani + Cold cathode gauge (ATM – 5x10-7 Pa)

Physical W565 x H850 x D580 mm, 84 kg

(Not includes vacuum pump, computer and its peripheral)

Power Single phase: AC100-120V or 200-240V / 1500VA

(400VA is for vacuum pump)












Product Brochure (PDF)

BELsorp - MAX

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