LAUDA Puridest PD 4 Water Distiller, Single-column Distiller, L003012

The LAUDA Puridest PD 4 water distillation unit is a highly efficient, thermal system solution for the fully automated production of high-purity, sterile and pyrogen-free ultrapure water (mono-distillate) in clinical, pharmaceutical and university laboratory settings. In demanding analytical processes, reagent preparation or microbiological cell culture applications, the consistent removal of inorganic salts, organic impurities and microbial contaminants is the primary criterion for gently eliminating interference effects in instrumental analyses. This fully automatic compact system delivers an excellent distillate conductivity of approx. 2.3 µS/cm at 25 °C and, with a continuous output of 4 litres per hour, ensures a self-sufficient supply of ultrapure water for direct transfer to external storage systems. For laboratory managers and procurement officers, this integrated system architecture—which does not require a storage tank—offers the ideal, space-saving solution for flexible requirements, whilst ensuring exceptional process reliability in accordance with stringent GLP and GMP guidelines.

Thermodynamic separation process and ultrapure water quality

The distillation-based operating principle of the Mono distillation unit is founded on the classic, physically unrivalled phase transition of raw water into the vapour phase, followed by condensation. Through boiling in the precisely temperature-controlled distillation flask, non-volatile impurities, heavy metal ions and particulate matter are retained in the sump. A key fluid dynamics-related quality feature is the integrated CO₂ degassing port on the condenser, which reliably separates volatile acidic gases such as carbon dioxide to prevent any subsequent drop in the pH of the distillate in the collection vessel. The integrated condenser is fitted as a robust cooling coil and guarantees highly efficient enthalpy exchange with minimal thermal losses.

Cooling efficiency and automated resource management

The thermodynamic kinetics of the LAUDA Puridest PD 4 are characterised by intelligent, energy-optimised media management. The cooling water used for condensation – which is heated in a manner that is gentle on the material – is fed directly into the distillation flask (boiler). This energy-efficient circulation drastically reduces the required nominal thermal output of the 3 kW tubular heating elements and minimises the overall carbon footprint of laboratory operations. To conserve valuable raw water resources, the system switches off immediately in the event of an interruption to the water or electricity supply, thereby preventing uncontrolled idle consumption whilst preserving the equipment.

Materials Science: System Integrity and Stability

The physical boundaries of the apparatus are defined by a double-walled, powder-coated housing made of galvanised sheet steel, which offers outstanding thermal insulation and mechanical resilience. All functional components in contact with samples and steam – such as the tubular heating elements, distillation flask and condenser – are made of high-purity, stainless steel. This material-science-based quality feature prevents metallic cross-contamination and facilitates cyclic descaling via the easily accessible distillation flask. Monitoring is carried out by a thermostatic low-water cut-out (dry-run protection), which instantly disconnects the system from the power supply if the raw water supply fails, ensuring self-sufficient and absolutely safe operation.

Technical details

Distillation & Metrological Specifications

• Unit type: Single-unit distiller / Fully automatic without storage tank
• Production capacity: 4.0 l/h
• Conductivity of mono-distillate at 25 °C: 2.3 uS/cm
• Degassing: CO₂ degassing port on the condenser

Thermodynamics & Fluid Management

• Max. heating power: 3 kW
• Max. power consumption: 3 kW
• Cooling water consumption: approx. 1.1 l/min
• Minimum cooling water pressure: 3 bar
• Max. cooling water pressure: 7 bar
• Water inlet connection (water cooling): 1/2 inch (hose connection)
• Water outlet connection (water cooling): 1/2 inch (hose connection)

Design, Protection & Safety

• Material (in contact with the sample): High-quality, stainless steel (tubular heating element, bladder, condenser)
• Housing material: Galvanised sheet steel, powder-coated (double-walled design)
• Installation: Suitable for tabletop use or secure wall mounting
• Safety systems: Thermostatic low-water protection (dry-run protection)
• Distillate outlet: Via a free outlet at the bottom of the condenser

Dimensions & Logistics

• Unit dimensions (W x D x H): approx. 300 x 270 x 510 mm
• Net weight: approx. 11 kg
• Ambient temperature range: 10 to 40 °C
• Mains supply: 230 V / 50/60 Hz
• Mains plug: Sturdy mains cable with Schuko plug

Contents of delivery

• 1 x LAUDA Puridest PD 4 water distiller base unit (MPN: L003012)
• 1 x Integrated mains cable with Schuko plug
• 1 x User manual

Important note: Connection hoses for the water inlet and outlet, collection containers and mounting hardware for optional wall mounting are not included as standard and must be ordered separately according to your specific application.

Individual requirements & accessories

To optimise ultrapure water quality and protect the stainless steel distillation flask from rapid limescale build-up, we recommend the use of pre-treatment components upstream, depending on the local raw water hardness. Our range includes suitable dechlorination filters (dechlorination filters with initial fill), phosphate barriers for hardness stabilisation, and 1-µm pre-filters including a fine filter cartridge. For storing the produced distillate, we offer chemically inert collection tanks made of polyethylene (PE) or glass. Please use our technical procurement service to configure your bespoke water treatment system.