The Minimum Free Space Oven (MFSO) is designed for precise coal drying and moisture determination, featuring a compact heated chamber with the lowest practical internal volume to minimise free space and improve measurement accuracy.

The MFSO-ISO model operates with a regulated flow of moisture-free nitrogen gas, efficiently removing moisture released from coal at 105 °C in full compliance with BS 1016-104.2:1991, BS ISO 687:2010, and BS ISO 11722:2013.

The MFSO-ASTM model uses controlled airflow in accordance with ASTM D3173-11, ensuring accurate, repeatable moisture analysis for ASTM-based testing laboratories.

Engineered for uniform heating and controlled gas flow, the MFSO delivers reliable, standards-compliant moisture results for coal testing laboratories and industrial quality control environments.

Standard Features

• Maximum temperature: up to 210 °C

• Maximum continuous operating temperature: 210 °C

• Chamber dimensions: 43 × 195 × 300 mm (H × W × D)

• Chamber volume: 2.5 litres

• Aluminium chamber resistant to oxidation and corrosion, ensuring excellent temperature uniformity.

• Gas flow passes through a pre-heating chamber before entering the work chamber.

• Adjustable flow meters mounted on the control panel

• Two flow meters for nitrogen flow and chamber seal integrity (MFSO-ISO)

• Two flow meters for air flow and chamber seal integrity (MFSO-ASTM)

• Aluminium loading tray supplied as standard

• Temperature measurement using a ‘K’ type thermocouple

Optional Features

• Over-temperature protection

• Multi-segment, multi-program storage controllers

• Silica or alumina crucibles with well-fitted lids

• Vacuum desiccator with gas inlet and outlet

The Minimum Free Space Oven is ideal for coal laboratories, research facilities, and industrial testing environments, delivering accurate moisture determination, excellent temperature control, and full compliance with ISO, BS, and ASTM standards.