Lauda PD 2, Operating Instructions Manual, Page: 11 / 22

09/2020 Puridest Mono Distillation Apparatus 11 / 22
8 Functional Description
The tap water flows through the cooling coil in the condenser to the water level regulator on the right-hand side of the
unit. The mechanical water level regulator determines the water level in the boiler so as to ensure that the heating element
is constantly kept below water level. Water that is not used for evaporation flows off through the cooling water outlet.
When the heating element is switched on, it brings the water in the alembic to the boil. A thermostatic low water cut-off
protects the heating element from running dry. The produced steam is led into the condenser, condenses on the cooling
coil and drips off as distillate through the drain tube on the front. By setting the temperature of the cooling water between
60 °C and 70 °C, to be checked with the inserted thermometer, the unit's efficiency and the produced quantity of distil-
late is optimised.
9 Maintenance, Service and Removal of Malfunctions
Caution:
Before servicing the unit let the Distillation Apparatus cool down!
Danger of burns!
Caution:
Before opening the Distillation Apparatus as well as before cleaning procedures, discon-
nect the unit from the mains! (Unplug the unit or switch off the main switch).
Danger of electrical shock!
Descaling 9.1
Depending on the hardness of the tap water, the Distillation Apparatus must be
cleaned from scale formations in regular intervals. To do so, close the on-site
water supply valve and lift the condenser from the boiler. A suitable descaling
agent is a mixture of 10 % formic acid, 10 % acetic acid and 80 % distilled water.
Fill the solvent into the boiler until it covers the topmost scale deposits and heat
up to maximum approx. 70 °C. Make absolutely certain not to bring the mixture
to a boil.
Pour the scale-solvent mix from the boiler after approx. 30 minutes and then rinse the boiler thoroughly with tap water.
Commercial descaling agents, suitable for use with stainless steel, can also be used according to the manufacturer's in-
structions (e. g. rea-calc® of M/s CHEMOTEC GmbH, 63486 Bruchköbel, Germany). Never use any products con-
taining hydrochloric acid! These will lead to damages to heating element, boiler, temperature sensor and the ducts of the
screw connections. Restart the unit as described in chapter 7. After descalings, the first few litres of distillate should not
be used as it might contain traces of evaporated descaling agent.