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FOSS - Fat Analyzer - ST 255 Soxtec™

Semi automated, flexible extraction system suitable for a wide range of applications in the food, feed, environmental and other industrial segments.


Safe operations with spark proof hot plate. Save time with batch handling tools. Compatible with hydrolysis solutions for total fat analysis.

Sample type

Feed, feed ingredients, forage, pet food, food, food ingredients, grain, cereal, oil seeds, DDGS, meat, meat products, fish, fish products, dairy products, environmental products (e.g. soil, sludge, waste water) and other industry products (paper pulp, textiles, rubber, tobacco, fertilizer, detergents, plastic and more).


Crude fat, total fat and extractable matter.

The Soxtec™ series

Soxtec™ 8000 ST 255 Soxtec™ ST 243 Soxtec™
Levels of automation Fully automated Semi automated Manual
Positions 6 - 12 6 6
Capacity/day 42/86 samples 30 - 36 samples 30 - 36 samples
Solvent volume 40 - 110 ml 70 - 90 ml 40 - 50 ml
Thimble diameter 26, 33 mm 26, 33 mm 26 mm
Compatible with hydrolysis unit Hydrotec™ 8000 and SC 247 SoxCap™ Hydrotec™ 8000 and SC 247 SoxCap™ SC 247 SoxCap™ with mini capsules

Technical specification

Performance data at 230 V
Extraction time Typically 45 – 60 min
Solvent volume 70 – 90 ml depending on cup type
Sample size 0.5 – 3 g depending on sample type 0.5 – 2 g (for total fat)
Capacity/batch 6 positions
Capacity/day 36 samples
Temperature range 0 – 285 °C
Measuring range 0.1 – 100 %
Reproducibility 1% rel. Or better (5 – 100% fat)
Solvent recovery Typically 80 %
Accuracy According to officially approved methods
Installation Requirements
Power supply 230 V, 50-60 Hz
Power consumption 1550 W
Water consumption 2/l min
Weight net Extraction unit: 30 kg
Control unit: 3 kg
Dimensions (W x D x H) Extraction unit: 600 × 380 × 580 mm
Control unit: 310 × 240 × 160 mm
Ventilation Fume hood min. Airflow 0,5 m/s (inter locked)

Key features


Soxtec systems has an extensive range of accessories with glass and aluminium cups and thimbles in different sizes to fit individual laboratory needs and applications.

Batch handling tools and accessories

Overall laboratory efficiency is further improved by the purpose-developed handling tools delivered with the Soxtec™ system. The tools for simple batch-wise sample handling save time, simplify usage and minimise risk of operator error. There is no longer any need for manual handling of thimbles or hot extraction cups.

Total fat determination

Compatible with Hydrotec™ 8000 Hydrolysis unit for total fat determination.

ST 255 Soxtec™ solvent extraction system

  • Biopharmaceutical and Biotechnology
  • Chemical
  • Education & Academics
  • Environmental
  • Food & Beverage
  • Pharmaceutical
Foss Analytical

FOSS creates end-to-end solutions that secure and improve food quality. From raw material to finished product. Our analysis instruments refine measurements into information management that enables businesses to run intelligent data-driven productions with less waste and bigger yields. Controlling cost and quality across all sectors and value chains, we help food and agricultural producers limit the number of human errors, scale their business faster and reduce manual labor as well as labor costs. We call it analytics beyond measure.

We cover these food and agricultural industries: Dairy, Feed and Forage, Grain, Flour Milling & Oilseed Processing, Laboratories, Meat, Raw Milk Testing and Wine.

Over the last 60 years, we have made it our business to define the standard of analytical solutions for the food and agricultural industry. We pioneered advanced analysis for the challenging production environments in the 1960’s, and we were the first to integrate chemical composition analysis in process lines. Now our resolve and ambition have also made us the international benchmark in the field of chemometrics and real time analytics.