LAUDA Puridest PD 4 DG Water Distiller, Glass Double-Distillation Apparatus, L003024

The LAUDA Puridest PD 4 DG water distillation unit is a specialised thermal system solution for the fully automated production of high-purity, sterile and pyrogen-free double distillate (bi-distillate) in clinical, pharmaceutical and chemical laboratory settings. In the most demanding analytical processes, such as cell culture inoculation, molecular biological PCR preparation or instrumental trace analysis, the uncompromising elimination of inorganic and organic impurities is the primary criterion for physically ruling out process-related artefacts. The compact system operates on the principle of two-stage cascade distillation and completely avoids the use of metallic surfaces during the critical phases. This dual phase transition guarantees outstanding ultrapure water quality with a minimum conductivity of approx. 1.6 uS/cm at 25 °C, thereby ensuring the highest level of SOP compliance and validity in laboratory operations.

Two-stage all-glass cascade distillation for maximum purity

The distillation-based purification principle of this fully automatic unit is based on two thermal evaporation cycles connected in series. An outstanding material-related feature is the fact that the evaporators, condensers and overflow pipes are manufactured entirely from high-purity DURAN borosilicate glass 3.3. This material-science specification guarantees absolute inertness towards both the gas and liquid phases, thereby permanently and gently ruling out metallic abrasion and ion carry-over in the final purification phase. 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 reduction in the pH of the distillate within the media stream. The heating capacity ensures highly efficient evaporation rates and a continuous production rate of 4 l/h.

Quartz-sheathed heating elements and optimised energy management

The thermal heating concept of the LAUDA Puridest PD 4 DG is implemented using high-performance electric heating rods fitted with a high-quality quartz glass sheath. This sheath not only minimises abrasive wear caused by limescale deposits in the boiler, but also ensures highly efficient heat radiation to the surrounding fluid. With a heating capacity of 5.8 kW, the system ensures extremely short pull-down times to the boiling point. To drastically reduce operating costs, the system utilises an intelligent energy recovery concept: the cooling water used to condense the steam – which is heated in a way that is gentle on the material – is fed directly into the evaporative boiler, thereby significantly minimising overall energy consumption.

Cybernetic monitoring and process-reliable media management

To ensure seamlessly monitored quality management, the unit is equipped with a process-reliable cybernetic monitoring system. An integrated electronic contamination monitor continuously measures the status inside the evaporator; in the event of a critical load, it automatically initiates a water change to thoroughly flush and clean the boiler. An integrated solenoid valve controls the water supply in a way that is gentle on the material and blocks the inflow once the target state is reached, thereby reliably preventing unnecessary wastage of cooling water resources. An electronic level monitoring system and a dual water shortage safety feature instantly disconnect the system from the mains supply in the event of a failure in the raw water supply, enabling self-sufficient and unattended continuous operation in the laboratory. Thanks to an easily removable, shatterproof and non-fogging front pane, the entire distillation process can be visually monitored.

Technical details

Distillation & Metrological Specifications

• Apparatus type: Bi-glass distillation apparatus / Fully automatic double distillation unit
• Production capacity: approx. 4.0 l/h
• Conductivity of bi-distillate at 25 °C: 1.6 µS/cm
• Condenser sterilisation: Can be carried out using steam directly within the system
• Degassing: Integrated CO₂ degassing port via the condenser outlet

Thermodynamics & Fluid Management

• Max. heating power: 5.8 kW
• Max. power consumption: 5.8 kW
• Heating elements: Special heating rods with quartz glass sheathing
• Cooling water flow rate / consumption: approx. 2.2 l/min
• Minimum cooling water pressure differential: 3 bar
• Max. cooling water pressure: 7 bar
• Distillate outlet: Via hose connection on the right-hand side of the unit

Design, protection & safety

• Material (in contact with sample): DURAN / borosilicate glass 3.3 (evaporator, condensers, overflows)
• Housing material: Galvanised sheet steel, high-quality powder-coated
• Viewing window: Easily removable, shatterproof and non-fogging front pane
• Installation: Suitable for flexible tabletop use or secure wall mounting
• Safety systems: Electronic contamination monitor with automatic water change, electronic level monitoring, low-water protection (dry-run protection)
• Water control: Integrated solenoid valve for automatic water shut-off

Dimensions & Logistics

• Unit dimensions (W x D x H): 650 x 365 x 390 mm
• Net weight: approx. 28 kg
• Ambient temperature range: 10 to 40 °C
• Mains supply: 400 V / 3/N/PE / 50/60 Hz
• Mains plug: Robust mains cable with plug (IEC 60309, 5-pin, CEE, red, 16 A)

Contents

• 1 x LAUDA Puridest PD 4 DG water distiller base unit (MPN: L003024)
• 1 x Integrated mains cable with 5-pin CEE plug (16 A)
• 1 x Operating instructions

Important note: Connection hoses for the water inlet and outlet, as well as pre-filter components compliant with the manufacturer’s specifications, are not included as standard and must be configured separately.

Individual requirements & accessories

To provide mechanical protection for the glass distillation flask against rapid limescale build-up and to extend maintenance intervals, the use of water treatment components in the upstream system is recommended, depending on local water hardness. Our product range includes suitable dechlorination filters, phosphate cartridges for hardness stabilisation and 1 µm pre-filters. For flexible operation with external storage systems, the unit can be connected to an external level switch to adjust distillate production to the fill level of a separate tank. Please use our procurement service to design your laboratory water infrastructure to suit your specific requirements.