LAUDA Puridest PD 4 DG Glass Double-Distillation Unit, 4 L/h, Conductivity 1.6 µS/cm, L003024

Anyone wishing to combine the advantages of glass distillation, namely the visible process and the absence of stainless steel in the water path, with a lower conductivity will find the Puridest PD 4 DG to be the suitable version. This bi-distillation unit features both distillation stages constructed entirely from Duran borosilicate glass 3.3, thereby achieving a conductivity of 1.6 µS/cm at a rate of 4 litres of bi-distillate per hour. The heating elements are sheathed in quartz glass.

Two distillation stages made entirely of glass

Unlike the PD 4 D, which uses stainless steel in the first stage, the entire water path in the PD 4 DG runs through glass. Raw water is fed into the first distillation flask via a solenoid valve, where it is heated and condensed in a drip-proof condenser section before the second stage further reduces the conductivity. A CO₂ degassing port on the condenser and an electronic contamination monitor, which automatically triggers a water change for cleaning, ensure low-maintenance operation. Sterilisation is achieved by steaming the condenser sections; the process remains visible at all times through the shatterproof front pane.

Connection and cooling water requirements

The PD 4 DG requires a three-phase connection with 400 volts, 3/N/PE at 50 or 60 hertz, and draws a maximum of 5.8 kilowatts; the mains cable terminates in a red CEE plug (IEC 60309, 5-pin, 16 A). Cooling water consumption is 2.4 litres per minute; the pressure differential must be at least 3 bar and must not exceed 7 bar. The water cooling inlet and drain are designed for a 1/2-inch diameter hose. The unit does not have a storage tank; the finished bi-distillate drains via the hose connection on the right-hand side of the unit.

Typical applications

• Bacteriological and medical sample preparation requiring a continuously visible process
• Preparation of cell and tissue cultures with high purity requirements
• Cleaning and sterilisation processes in the laboratory
• Production of buffer solutions in quality assurance, development and research, where contact with stainless steel in the water path is to be avoided

Series overview

Within the two-stage Puridest models, the PD 4 DG is the only version in which both stages are made entirely of glass; the Puridest PD 4 D achieves the same conductivity of 1.6 µS/cm with a first stage made of stainless steel. For a higher throughput at the same conductivity, the Puridest PD 8 D is available with a capacity of 8 litres per hour. If a simple single-stage distillate is sufficient, the Puridest PD 4 G covers the same performance class without a second distillation stage, whilst the Puridest PD 4 R offers the same single-stage performance in a stainless steel version.

Technical details

Scope of delivery

• LAUDA Puridest PD 4 DG, base unit (order number L003024)
• Mains cable with CEE plug (IEC 60309, 5-pin, 16 A)

Accessories required for operation, such as connection hoses for the cooling water supply or a wall bracket, are not included in the Scope of delivery.

Regulatory information

This unit is an electrical appliance within the meaning of the German Electrical and Electronic Equipment Act (ElektroG). The WEEE registration number of the manufacturer, LAUDA DR. R. WOBSER GMBH & CO. KG, is DE 66424057. Information on the return of old appliances can be found on our Environment and Disposal page.

Warranty and procurement service

LAUDA provides a standard 12-month manufacturer’s warranty on this device from the date of purchase. Your statutory warranty rights remain unaffected.

Anyone who has previously used the PD 4 D and wishes to switch to a fully glass-bodied model will find the PD 4 DG to be the appropriate alternative, with the same conductivity value. Our procurement service will, on request, compile a list of suitable accessories and spare parts for the Puridest series and also advise on whether the 8-litre class or a pure mono version is more appropriate for your specific requirements.