Karl Schnell - 1998 Karl Schnell FD 9

• Preserving sensitive biological materials such as vaccines, enzymes, and probiotics.
• Drying food products like fruits, vegetables, and instant coffee to extend shelf life and retain nutritional value.
• Processing pharmaceuticals and active pharmaceutical ingredients (APIs) where water removal at low temperatures is critical.
• Manufacturing advanced materials and chemicals requiring precise moisture content control.
• Restoring water-damaged documents and artifacts in archival and museum settings.

Typical capacity

For this class of laboratory or pilot-scale freeze dryer, chamber capacities typically range from 5 to 20 litres, with ice condenser capacities commonly between 5 and 15 kg.

Power supply

Units of this type commonly require a 230V, single-phase electrical supply, though larger systems may use three-phase power.

Temperature range (shelf)

Freeze dryer shelves typically offer temperature control from -50°C to +50°C for precise product processing.

Vacuum level

Operating vacuum levels are commonly in the range of 0.01 to 0.1 mbar to facilitate efficient sublimation.

Footprint

A unit of this size typically has a footprint suitable for laboratory or small production environments, often requiring less than 1 square metre of floor space.

Condenser temperature

Ice condensers commonly reach temperatures of -70°C to -85°C to efficiently trap sublimated ice.

• What is the typical lead time for installation and commissioning?

  Installation and commissioning lead times can vary significantly based on the seller's schedule and the buyer's site readiness. It is advisable to discuss this directly with the seller.

• What maintenance is typically required for a used freeze dryer?

• Are spare parts readily available for a Karl Schnell FD 9?

• What utilities are needed to operate this type of freeze dryer?

• Can this unit be used for pharmaceutical applications?

Freeze dryers are valued for their ability to preserve heat-sensitive materials whilst extending shelf life in pharmaceutical, biotech and laboratory settings. When buying used equipment, buyers typically prioritise chamber condition, vacuum pump performance and calibration history. Industry sentiment suggests these machines offer reliable operation when properly maintained, though they require careful attention to temperature uniformity and moisture removal efficiency. Reputable brands tend to hold value, and thorough pre-purchase inspection of seals and control systems is considered essential for long-term performance and cost-effectiveness.

General overview for this equipment type