Made to order

Microtrac BELSORP MINI X BET Surface Area and Pore Size Analyzer

With every system

Installation & training setup and BELCONTROL/BELMASTER 7 onboarding
a BET measurement on your own material

Gas Adsorption Measurement, Microtrac Particle Characterization, Surface Area & Pore Size Distribution · Gas adsorption (volumetric, BET / mesopore)

Microtrac BELSORP MINI X BET Surface Area and Pore Size Analyzer

Compact BET surface area and pore size analyzer — up to four samples at once, from 0.01 m²/g with nitrogen, pores 0.7 to 500 nm.

Each port with its own transducer, helium-free AFSM™2 measurement
Quick BET: three-point BET of several samples in about 15 minutes
Installation and on-site training included · free test analysis of your sample
Configured to order · lead time from 4 weeks

Prices follow supplier cost and stock availability and are updated regularly. The price you see is today's price — once you order, it's held for 7 days.

Installation + training included Free test measurement

0.01 m²/g min. BET area

4 samples in parallel

38 kg smallest & lightest

He-free no helium calibration

What your process engineer actually checks

Routine BET, done fast

Four samples in parallel, helium-free, from 0.01 m²/g — the MINI X turns daily BET and mesopore QC into a walk-up routine, with an independent transducer per port so results don't wait on each other.

A materials engineer on the line

Configuration and BET/BJH/NLDFT method support from engineers who run surface-area analysis in-house at Additive Plus.

0.01 m²/g

Min. BET area (N₂)

0.7–500 nm

Pore size range

Up to 4

Sample ports

Helium-free

AFSM™2

38 kg

Bench-top weight

About this product

Price

Quoted to your configuration

The price depends on the 3-port or 4-port model and on options: the molecular probe method, NLDFT / GCMC analysis, FDA 21 CFR Part 11 compliance, the in-situ heater, the water bath and the gas selector. You receive a formal quotation on our letterhead with configuration, price, payment terms and lead time: the document your purchasing department asks for. Installation and on-site operator training are included in every quotation. Lead time from 4 weeks, depending on the configuration; the quotation gives the date.

What you configure

BELSORP MINI X with 3 or 4 sample ports, each with its own 133 kPa pressure transducer, plus a dedicated p₀ port
Rotary vacuum pump; 2 gas ports as standard, up to 5; gas selector for up to 4 adsorptives plus helium
Options: molecular probe method (pores from 0.35 nm), NLDFT / GCMC (BELSim), FDA 21 CFR Part 11
In-situ heater (50–450 °C, 4 ports) and water bath (−10 to 70 °C) as options
BELCONTROL operation and BELMASTER 7 analysis software; multi-device control of up to 5 units
Installation and on-site operator training — included in every quotation

Next stepRequest a formal quotation

The test analysis of your sample is free: it is measured in Microtrac’s US application lab, you get the report and we go through it with you before you decide.

Up to 4 samplesMeasured simultaneously, each port with its own transducer

0.01 m²/gBET surface area with N₂, no krypton needed

0.7 – 500 nmPore size distribution; from 0.35 nm with the molecular probe option

38 kg280 × 650 × 465 mm, without vacuum pump and PC

What the BELSORP MINI X is

The BELSORP MINI X is Microtrac’s compact volumetric analyzer for specific surface area, pore size distribution and pore volume. Up to four samples are measured at the same time, and because every sample port has its own pressure sensor and the saturation vapor pressure has its own port, the four measurements run fully independently of each other.

The isotherm starts at P/P₀ ≈ 10⁻⁴, which covers BET surface area and mesopores. The patented AFSM™ method follows free-space changes in an empty reference cell during the run, so the liquid nitrogen level does not have to be held constant; AFSM™2 measures without helium. In Microtrac’s test on the certified alumina reference BCR-170 the BET result stayed at 1.02–1.03 m²/g while the total surface in the cell fell from about 2 m² to 0.4 m² — the basis for measuring low-area samples with nitrogen instead of krypton.

Specifications

Measuring principle	Volumetric method + AFSM™ (AFSM™2 helium-free)
Specific surface area	from 0.01 m²/g (N₂), depending on sample density
Pore size distribution	0.7 – 500 nm · option: from 0.35 nm by molecular probe method
Low-pressure isotherm	P/P₀ = 10⁻⁴ (N₂ at 77 K, Ar at 87 K)
Samples at once	max. 4 (3 in High Accuracy mode)
Gas ports	2 as standard, 5 max.
Adsorption gases	N₂, Ar, CH₄, C₂H₆, CO₂, H₂, n- and iso-butane and other non-corrosive gases
Pressure transducers	133 kPa (1000 Torr) × 6
Vacuum	rotary pump
Sample tube	approx. 1.8 cm³ standard, 5 cm³ optional
Dewar	2 L, holding time 30 h
Pretreatment heater	50 – 450 °C, 4 ports (option)
Water bath	−10 – 70 °C, 4 ports (option)
Multi-device control	up to 20 measuring ports (5 units)
Dimensions (W × H × D)	280 × 650 × 465 mm (11.0 × 25.6 × 18.3 in), without vacuum pump and PC
Weight	38 kg (84 lb), without vacuum pump and PC
Power	single phase, AC 100 – 240 V, 50/60 Hz, 10 A including rotary pump
Gas supply	He, N₂ of 99.999 % purity or higher, 0.1 ± 0.02 MPa, 1/8″ Swagelok
Software	BELCONTROL · BELMASTER 7 · NLDFT / GCMC with optional BELSim
Compliance	CE · FDA 21 CFR Part 11 optional
Installation and training	on site, included in every quotation
Lead time	from 4 weeks, depending on configuration

Download: BELSORP MINI X datasheet (PDF)

What it tells you about a powder

The datasheet names catalysts, battery materials, zeolites, ceramics, carbon, cement, silica, pigments, toners and pharmaceuticals among its fields. The MINI X reports:

BET surface area	multi-point or single-point, per ISO 9277; Annex C (Rouquerol plot) for microporous materials
Mesopores and macropores	BJH, DH, CI and INNES pore size distributions above 2 nm, up to 500 nm
Pore volume	t-plot and αs plot, from ultra-micropores to meso- and macropores
Micropores	MP and Dubinin-Astakhov methods; molecular probe option from 0.35 nm; NLDFT / GCMC with BELSim
Low-area samples	nitrogen down to about 0.1 m² total surface in the cell — BCR-170 alumina (certified 1.05 ± 0.05 m²/g) measured 1.02–1.03 m²/g
Quick BET check	two samples gave 190.5 and 77.4 m²/g in Quick BET against 189.9 and 75.7 m²/g in a full isotherm

Three ways to run it

High-precision modeThree samples are measured and an empty reference cell follows the free space by AFSM™. For development work and small sample amounts.

Multi-sample modeAll four ports measure samples, with each port’s own pressure sensor and the p₀ measured on its dedicated port. For routine work on many samples.

Quick BET modeA three-point BET of several samples in about 15 minutes, with results comparable to the full isotherm. For quality control throughput.

Gas Dosing Optimization loads an earlier isotherm and sets the dosing automatically, which shortens repeat measurements of similar samples. Up to five MINI X units — 20 measuring ports — can be run from one PC.

Where the MINI X stops — and what to take instead

The MINI X uses 133 kPa transducers only, so its isotherms start at P/P₀ ≈ 10⁻⁴. That is enough for BET and mesopores, but not for detailed micropore analysis of zeolites, MOFs or activated carbons: for that take the BELSORP MAX G (one sample, from 10⁻⁸, with krypton) or the BELSORP MAX X (four samples, from 10⁻⁸, plus water and organic vapors). Krypton is not in the MINI X gas list. For a single-point BET value with automatic pretreatment there is the BELSORP MR 1. Pores above 500 nm need mercury porosimetry on the BELPORE. To degas samples while the MINI X measures, add a BELPREP VAC; for isotherms at other temperatures, the BELCRYO X connects to the MINI X.

In pictures

BELSORP MINI X side view — Compact multi-port frame, 280×650×465 mm.

BELSORP MINI X accessories — Sample cells and standard accessories.

BELSORP MINI X heater and controller — Heater and controller for sample pretreatment.

Availability, payment and delivery

Built to orderEach instrument is configured with the port count and options for your samples. Lead time is from 4 weeks after a confirmed order, depending on the configuration; the quotation states the date in writing.

How you payAsk for a formal quotation on our letterhead and pay against an invoice. We are registered in SAM.gov as a small business, so federal and university purchasing works the usual way.

What arrivesThe analyzer with rotary pump, Dewar, standard consumables — sample cells, filler rods, filters, O-rings, caps, weighing platforms — and BELCONTROL and BELMASTER 7 software. Installation and on-site operator training are included in every quotation and carried out by Microtrac’s US service engineers.

Why buy it through Additive Plus

Authorized Microtrac resellerQuotation, order and delivery handled by one team in California

Installation and training includedSet up on site and your team trained on BELCONTROL and BELMASTER 7 — part of every quotation

Free test analysisSend a sample and decide with the BET and pore report in hand

What usually stops people — and the honest answer

“Our samples have low surface area — don’t we need krypton?”Often not. With AFSM™ the MINI X measures low-area samples with nitrogen down to about 0.1 m² total surface in the cell. Below that, krypton on the MAX G or MAX X is the answer.

“Will one slow sample hold up the others?”No. Each sample port has its own pressure transducer and the saturation pressure has its own port, so the four measurements are fully independent.

“We are a regulated lab.”FDA 21 CFR Part 11 compliance is available as an option, and BELCONTROL’s Simple Mode lets operators run a measurement with only sample data, pretreatment and range.

“We are not sure the MINI X is enough.”If your material has micropores below about 2 nm, it probably is not. Send a sample — the test analysis is free — and the isotherm shows whether you need the MINI X or a MAX model.

Ready when you are

Request a formal quotation

Brand	Microtrac
Technology	Gas adsorption (volumetric, BET / mesopore)
Certification	CE
Weight	84 lb / 38 kg

Product data sheet (PDF)

pdf · 1607 KB

↗

Product videos

What our customers say

★★★★★

“Harry and team were professional, effective communicators as we set up the order, then they executed quickly and produced an amazing product for us at a very competitive price. Am looking forward to our next print w Additive Plus!”

Luke DunningtonGoogle · Nov 2025

★★★★★

“Great 3D printing service and the resin parts look super smooth and clean. Really happy with how everything turned out!”

Laura SmithGoogle · Sep 2025

★★★★★

“Harry was very professional and helped me out with my 3D printing needs and explained what options I have in terms of filaments such as PEEK. Highly recommended.”

Steven FrancoGoogle · Oct 2026

★★★★★

“I needed a 3D enclosure printed urgently in a specific time period, they did great!”

IvoGoogle · Sep 2026

Common questions

Don't see yours? Email [email protected] — NDA on request, typical reply within 4 hours.

How does the BELSORP MINI X differ from the BELSORP MAX X?

The MINI X measures up to four samples from P/P₀ ≈ 10⁻⁴ with 133 kPa transducers — BET surface area and mesopores. The MAX X also measures up to four samples but starts at P/P₀ = 10⁻⁸ with additional low-pressure transducers, resolves pores from 0.35 nm, measures krypton down to 0.0005 m²/g and adds water and organic vapor isotherms. Choose the MINI X for routine BET and mesopore work, the MAX X for micropores and vapors.

What surface area and pore size range does it cover?

BET surface area from 0.01 m²/g with nitrogen, depending on sample density. Pore size distribution from 0.7 to 500 nm; with the optional molecular probe method from 0.35 nm.

What does helium-free measurement change in practice?

With AFSM™2 the free space of a blank sample cell and reference cell is measured with the adsorptive gas in advance, and the adsorption measurement then runs without helium. Several steps of the helium method are skipped, so measurements are shorter, and the coolant level does not need to be matched between blank and sample.

Are the four ports really independent?

Yes. Each sample port has its own 133 kPa pressure transducer and the saturation vapor pressure is measured on a dedicated port, so the measurements run simultaneously and independently. In High Accuracy mode three ports measure samples and one holds the reference cell.

Which gases and analysis methods are supported?

Gases: N₂, Ar, CH₄, C₂H₆, CO₂, H₂, n-butane, iso-butane and other non-corrosive gases. BELMASTER 7 calculates BET (including Type I per ISO 9277) and Langmuir surface area, BJH, DH, CI and INNES distributions, t-plot, αs plot, MP and Dubinin-Astakhov methods and the molecular probe method. NLDFT / GCMC is optional through BELSim.

How compact is it and what does it need?

The main unit is 280 × 650 × 465 mm and 38 kg, without vacuum pump and PC. It runs on single-phase AC 100–240 V, 10 A including the rotary pump, needs helium and nitrogen of 99.999 % purity at 0.1 MPa, and a liquid nitrogen Dewar (2 L, 30 h holding time).

What is the lead time and what is included?

The MINI X is configured to order. Lead time is from 4 weeks after a confirmed order, depending on the configuration, and the formal quotation states the date. Installation and on-site operator training by Microtrac's US service engineers are included in every quotation.

How much does a BELSORP MINI X cost?

The price depends on the 3- or 4-port model and the options — molecular probe, NLDFT / GCMC, 21 CFR Part 11, heater, water bath, gas selector. Request a formal quotation and you receive configuration, price, payment terms and lead time on our letterhead.

Can I test my sample before buying?

Yes, and the test analysis is free. Send a representative sample; it is measured in Microtrac's US application lab and you receive the report, which we go through with you before you decide.

Can the MINI X measure low surface areas without krypton?

Within limits, yes. Microtrac measured the certified alumina reference BCR-170 (1.05 ± 0.05 m²/g) with nitrogen and got 1.02–1.03 m²/g with only 2 m² down to 0.4 m² of total surface in the cell; the stated limit is about 0.1 m² total surface. Below that, krypton on a BELSORP MAX G or MAX X is needed.

Place your order, or talk to an engineer first

Order Microtrac BELSORP MINI X BET Surface Area and Pore Size Analyzer direct, or talk to materials engineer

Add to cart

Microtrac BELSORP MINI X BET Surface Area and Pore Size Analyzer

What your process engineer actually checks

Routine BET, done fast

A materials engineer on the line

What the BELSORP MINI X is

Specifications

What it tells you about a powder

Three ways to run it

Where the MINI X stops — and what to take instead

In pictures

Availability, payment and delivery

Why buy it through Additive Plus

What usually stops people — and the honest answer

Ready when you are

Product data sheet (PDF)

Product videos

Other products teams run alongside Microtrac BELSORP MINI X BET Surface Area and Pore Size Analyzer

What our customers say

Common questions

Place your order, or talk to an engineer first