LAUDA Puridest PD 8 D Water Distiller, Double-distillation unit, L003022

The LAUDA Puridest PD 8 D water distiller represents a highly advanced, thermal system solution for the fully automated production of high-purity, sterile and pyrogen-free double distillate (bi-distillate) in clinical, pharmaceutical and university laboratory settings. In the most demanding analytical processes, such as cell culture inoculation, molecular biological PCR preparation or instrumental trace analysis, the uncompromising removal of inorganic and organic impurities is the primary criterion for physically ruling out process-related artefacts. The mechatronic system operates on the principle of two-stage cascade distillation: The mono-distillate obtained in the first stage is fed directly into the second evaporation stage. This dual phase transition guarantees outstanding ultrapure water quality with a minimum conductivity of approx. 1.6 µS/cm at 25 °C, thereby ensuring the highest level of SOP compliance and validity in laboratory operations.

Two-stage cascade distillation for maximum conductivity precision

The distillation-based purification principle of this fully automatic system is based on two thermal evaporation cycles connected in series. Boiling in the primary distillation flask causes non-volatile impurities, heavy metal ions and particulate matter to be retained in the sump. A key fluid dynamics feature is the integrated CO₂ degassing port on the condenser, which reliably separates volatile acidic gases such as carbon dioxide to prevent any subsequent reduction in the pH of the distillate within the media stream. The enormous heating capacity of 11.5 kW ensures highly efficient evaporation rates and a continuous production rate of 8 l/h.

Hybrid material architecture and contamination-free withdrawal

The choice of materials for the PD 8 D combines the durability of robust metal with the absolute inertness of high-quality glass. Whilst the condenser (cooling coil) and the first-stage distillation flask are made from high-purity, stainless steel, the second-stage condenser and the integrated splash guard are made from DURAN borosilicate glass 3.3. This hybrid material architecture, based on materials science, permanently prevents metallic abrasion and ion carry-over during the final purification phase, whilst being gentle on the material. To ensure maximum flexibility in day-to-day laboratory work, the system allows for the separate collection of both grades: the mono-distillate can be collected via a precision shut-off valve made of borosilicate glass with a PTFE stem, whilst the ultra-pure bi-distillate flows through a free outlet, which is protected from atmospheric contamination by an integrated dust protection bell.

Cybernetic process monitoring and intelligent resource management

To ensure seamless quality management, the bi-distillation apparatus is equipped with an intelligent, cybernetic monitoring system. An electronic contamination monitor continuously measures the status inside the distillation flask; in the event of a critical load, the system automatically halts the process and displays a visual cleaning prompt, which significantly extends the service life of the quartz-clad heating elements. An integrated solenoid valve controls the water supply in a way that minimises wear on the equipment and triggers an automatic shut-off once the target condition is reached, thereby preventing unnecessary wastage of cooling water resources. A dual water shortage safety feature reliably protects the unit against running dry, ensuring self-sufficient and absolutely safe continuous operation.

Technical details

Distillation & Metrological Specifications

• Apparatus type: Bi-distillation apparatus / Fully automatic double distillation unit
• Production capacity: 8.0 l/h
• Conductivity of mono-distillate (stage 1) at 25 °C: 2.2 µS/cm
• Conductivity of bi-distillate (stage 2) at 25 °C: 1.6 µS/cm
• Degassing: CO₂ degassing port integrated into the condenser

Thermodynamics & Fluid Management

• Max. heating capacity: 11.5 kW
• Max. power consumption: 11.5 kW
• Cooling water consumption: approx. 3.3 l/min
• Max. cooling water pressure: 7 bar
• Water inlet connection (water cooling): 1/2 inch (hose connection)

Construction, Protection & Safety

• Material, Stage 1 (in contact with sample): Stainless steel (tube heater, distillation flask, condenser)
• Material, Stage 2 (in contact with sample): DURAN borosilicate glass 3.3 (condenser, splash guard, outlets)
• Housing material: Galvanised sheet steel, high-quality powder-coated (double-walled design)
• Installation: Suitable for tabletop installation or secure wall mounting
• Safety systems: Electronic contamination monitoring, automatic water shut-off, dual low-water protection (float switch & thermostat)
• Mono-distillate outlet: Shut-off tap made of borosilicate glass 3.3 with PTFE valve stem
• Bi-distillate outlet: Open drain with borosilicate glass dust protection bell

Dimensions & Logistics

• Unit dimensions (W x D x H): 700 x 390 x 700 mm
• Net weight: approx. 45 kg
• Ambient temperature range: 10 to 40 °C
• Mains supply: 400 V / 3/N/PE / 50/60 Hz
• Mains connection: Robust mains cable without plug (HAR)

Contents of delivery

• 1 x LAUDA Puridest PD 8 D water distiller base unit (MPN: L003022)
• 1 x Integrated mains cable without plug (HAR)
• 1 x Operating instructions

Individual requirements & accessories

To provide mechanical protection for the stainless steel and glass components against rapid limescale build-up and to extend maintenance intervals, the use of water treatment components in a pre-treatment configuration is recommended, depending on the local raw water hardness. Our product range includes suitable dechlorination filters for chlorine removal, phosphate cartridges for hardness stabilisation and 1 µm fine pre-filters. The system can optionally be linked to an external level switch to automatically adjust distillate production to the fill level of an external storage tank. Please use our technical procurement service to design your laboratory water infrastructure to suit your specific requirements.