Lauda PD 2 G User manual

Operating Instructions
Puridest Glass Distillation Apparatus
PD 2 G, PD 4 G, PD 8 G, PD 2 DG, PD 4 DG

2 / 34 Puridest Glass Distillation Apparatus 09/2020

09/2020 Puridest Glass Distillation Apparatus 3 / 34
LAUDA Puridest Glass Distillation Apparatus models PD 2 G, PD 4 G, PD 8 G, PD 2 DG and PD 4 DG produce ultra-
pure, bacteria and pyrogen-free distillate with a very low conductivity (approx 2.2 µS/cm at 25 °C for mono distillate and
1.6 µS/cm at 25 °C for bi distillate). The distillate is in conformity with DAB regulations and the regulations of international
pharmacopoeia.
Before installation, please check whether contents of package are in good order and complete.
Should you note any damages or have any reasons for complaint, please contact your supplier or directly.
LAUDA-GFL Gesellschaft für Labortechnik mbH
Schulze-Delitzsch-Str. 4+5
30938 Burgwedel - Germany
Telefon: [phone]
Fax: [phone]
E-Mail: [e-mail]
Internet: www.gfl.de

4 / 34 Puridest Glass Distillation Apparatus 09/2020

09/2020 Puridest Glass Distillation Apparatus 5 / 34
Content
Operating Instructions .....................................................................................................................................................................1
1Using of the Glass Distillation Apparatus..............................................................................................................................7
Intended Use....................................................................................................................................................................7
Improper Use ...................................................................................................................................................................7
2Warranty ...................................................................................................................................................................................8
3Before Initiation .......................................................................................................................................................................8
4Transport, Set-up and Location of the Distillation Apparatus.............................................................................................8
5Operating Voltage....................................................................................................................................................................9
6Water Connections ...............................................................................................................................................................10
Inlet separate water supply...........................................................................................................................................10
Tap water inlet ...............................................................................................................................................................10
Distillate outlet..............................................................................................................................................................10
Cooling water outlet.....................................................................................................................................................11
Drain Bi-stage boiler ....................................................................................................................................................11
Waste water drain .........................................................................................................................................................11
7Initiation.................................................................................................................................................................................11
8Functional Description .........................................................................................................................................................12
Puridest Glass Distillation Apparatus..........................................................................................................................12
Protection against over-heating in case of low water................................................................................................12
Glass Distillation Apparatus with separate water supply ...........................................................................................12
Glass Distillation Apparatus with level control switch for external storage tank .....................................................12
9Maintenance, Service and Trouble Shooting ......................................................................................................................13
Descaling .......................................................................................................................................................................13
Sterilising .......................................................................................................................................................................13
Water shortage in mono or bi stage ............................................................................................................................14
Pilot lamp "Clean" .........................................................................................................................................................14
10 Disposal of Old Units............................................................................................................................................................15
11 Technical Data .......................................................................................................................................................................16
Puridest Glass Distillation Apparatus models PD 2 G, PD 4 G and PD 8 G.........................................................16
Puridest Glass Bi Distillation Apparatus models PD 2 DG and PD 4 DG .............................................................18
12 Circuit diagram......................................................................................................................................................................19
PD 2 G for 230 V 50 / 60 Hz.................................................................................................................................20
PD 4 G for 230 V 50 / 60 Hz.................................................................................................................................20

6 / 34 Puridest Glass Distillation Apparatus 09/2020
PD 8 G for 220 V / 3 ~ / PE 50 / 60 Hz............................................................................................................... 21
PD 8 G for 400 V / 3 ~ / N / PE 50 / 60 Hz........................................................................................................ 21
PD 2 DG for 230 V 50 / 60 Hz ............................................................................................................................. 22
PD 4 DG for 220 V / 3 ~ / PE 50 / 60 Hz ........................................................................................................... 22
PD 4 DG for 400 V / 3 ~ / N / PE 50 / 60 Hz..................................................................................................... 23
Circuit diagram for accessory „level control switch“ and option „separate water supply“..................................... 23
13 Connection to the mains supply.......................................................................................................................................... 24
Connection to the mains supply (examples).............................................................................................................. 25
13.1.1 PD 2 G, PD 4 G and PD 2 DG for 230 V at Mains supply 220 V / 3 ~ / PE 50 / 60 Hz ..................... 25
13.1.2 PD 2 G, PD 4 G and PD 2 DG for 230 V at Mains supply 220 V / 3 ~ / PE 50 / 60 Hz ..................... 25
13.1.3 PD 8 G and PD 4 DG for 220 V / 3 ~ at Mains supply 220 V / 3 ~ / PE 50 / 60 Hz ........................... 26
13.1.4 PD 8 G and PD 4 DG for 220 V / 3 ~ at Mains supply 400 V / 3 ~ / N / PE 50 / 60Hz...................... 26
13.1.5 PD 8 G and PD 4 DG for 220 V / 3 ~ at Mains supply 220 V / 3 ~ / PE 50 / 60 Hz ........................... 27
13.1.6 PD 8 G and PD 4 DG for 220 V / 3 ~ at Mains supply 400 V / 3 ~ / N / PE 50 / 60 Hz..................... 27
14 List of spare parts .................................................................................................................................................................. 28
15 Accessories and Options ...................................................................................................................................................... 30

09/2020 Puridest Glass Distillation Apparatus 7 / 34
1Using of the Glass Distillation Apparatus
Intended Use
In LAUDA Puridest Glass Distillation Apparatus models PD 2 G, PD 4 G, PD 8 G, PD 2 DG and PD 4 DG, quartz-
sheathed heating elements serve to boil water and evaporate it. The steam is led from the glass boiler to a condenser with
splash guard and condenses on a water-cooled cooling coil. In Glass Mono Distillation Apparatus (models PD 2 G, PD 4
G and PD 8 G) the produced mono distillate can directly be withdrawn from the distillate outlet. In Glass Bi Distillation
Apparatus (models PD 2 DG and PD 4 DG) the produced mono distillate is evaporated again in a second, following distil-
ling stage. The bi distillate, condensed on the cooling coil of the second-stage condenser, can be withdrawn from the dis-
tillate outlet. All assembled glass construction parts are made of Duran® / borosilicate glass 3.3, the heating elements are
quartz-sheathed. The inside tubing consists of high-temperature resistant silicon hose. After switching the Distillation Ap-
paratus on, operation is controlled automatically.
Depending on the quality of tap water, the produced mono distillate of models PD 2 G, PD 4 G and PD 8 G has a con-
ductivity of approx. 2.2 µS/cm at 25 °C. In models PD 2 DG and PD 4 DG, the mono distillate is used to produce bi dis-
tillate in a consecutive distillation stage. The produced bi distillate is dependent on the quality of the evaporated mono dis-
tillate and has a conductivity of approx. 1.6 µS/cm at 25 °C.
The quality of the distilled water is, among other things, dependent on the composition of tap water as well as on the
cleanliness of the distillation stages. The distillate quality should be controlled in regular intervals and be compared with the
requirements of the relative application.
To feed the Distiallation Apparatus, preferably use tap water of drinking quality. Please also observe the information in
chapters „Accessories and Options“ of these instructions on the possible use of filters and cartridges to pretreat the tap
water.
The Bi Distillation Apparatus must be operated within the user's field of vision.
The information contained in these operating instructions must by all means be read and observed. Only
then a perfect operation of the Bi Distillation Apparatus can be guaranteed. The units may only be installed
and operated by persons who have made themselves familiar with these operating instructions.
Caution:
The accessible inner parts of the housing that can be reached after removing the front screen get strongly
heated up during operation. These parts must only be touched after they have cooled down, or when wear-
ing suitable safety gloves.
Improper Use
LAUDA Puridest Glass Distillation Apparatus, operated in a laboratory, are no Medical Devices. They fall neither under
national nor international Medical Device Directives and have to be used and applied accordingly. The Distillation Appa-
ratus must not be used in potentially explosive surroundings, e. g. during anaesthesia with inflammable gas or steam types .
The Distillation Apparatus must neither be set up nor operated in laboratory areas with aggressive or corrosive ambient
conditions.

8 / 34 Puridest Glass Distillation Apparatus 09/2020
2Warranty
For all laboratory apparatus and their accessories from LAUDA-GFL Gesellschaft für Labortechnik mbH, there is a war-
ranty claim, as well for spare parts, repairs and modifications, carried out by LAUDA-GFL. In order to identify defective
units, we require both model and serial number on the nameplate, left-hand side of the Distillation Apparatus and, if appli-
cable, a copy of the invoice.
3Before Initiation
Important information are marked in bold letters in these instructions, safety indications are additionally marked by the fol-
lowing warning symbols and mandatory signs.
Read and observe the
operating instructions
Warning of hot liquids
and vapour
Warning of hot surfaces
Warning of dangerous
electrical voltage
General warning
Before maintenance and repair
disconnect the unit all-pole from
the electrical mains (pull the plug
from the socket).
4Transport, Set-up and Location of the Distillation Apparatus
Protect yourself and the Distillation Apparatus during transport and setup by working carefully and
avoid danger of e. g. shifting or tilting the unit as well as risk of injury by lifting heavy loads. Caution, Dis-
tillation Apparatus PD 8 G, PD 2 DG and PD 4 DG with a net weight of 26 kg must be lifted, carried
and transported to the location by at least two persons. The Distillation Apparatus can be held between
the four stands of the unit and lifted for setup. The unit is suitable for both bench and wall mounting. It is
only suitable for indoor use. Table-top setting-up on solid, even and level surfaces only. Make sure to place the unit only
on a watertight, temperature-resistant, non-flammable surface. The location must provide sufficient space as well as the
necessary carrying capacity for the total weight of the Distillation Apparatus (unit weight as per Technical Data of this
manual, plus weight of the filling). For setting-up on the wall check the carrying capacity of the wall in connection with the
total weight of the unit (appliance plus water filling, see Technical Data). Make sure to check the on-site fixing elements in
order to guarantee safe hold of the Distillation Apparatus. The fixing material must be suitable for the substrate. Use only
tested and proven fixing material. There are two keyholes for wall mounting at the back of the Distillation Apparatus. Place
two fixing screws (not included in the scope of supply) in the wall, 40 cm apart, and nest the still on the keyholes. The Dis-
tillation Apparatus is delivered without fixing material. To protect the glass parts during transport, the inside of the Distilla-
tion Apparatus is filled with packing material, and all free openings are taped. These transport protections must be removed
before initiation. When installing the glass condenser and the glass fittings, pay special attention due to danger of glass
breakage.

09/2020 Puridest Glass Distillation Apparatus 9 / 34
5Operating Voltage
The Distillation Apparatus Models PD 2 G, PD 4 G and PD 2 DG must be connected to the mains supply through a cor-
rectly installed shock-proof socket. The models PD 8 G and PD 4DG must be connected to the mains supply through a
correctly installed on-site main switch, or, permanently connected, through a CEE plug in conformity with IEC standard
60309-2.
The unit is a protection class I electrical appliance, a connection to the protective earth is to be ensured.
For information on the value of the required mains fuse see Technical Data of these instructions.
The electrical connection must ensure an all-pole separation from the mains at any time. Shock-proof
sockets or main switches to separate the Distillation Apparatus from the mains must be installed in such a
way as to ensure clear identifiability and easy accessibility at any time.
The mains connection cable must not touch any hot surfaces of the unit. It may not lead underneath
the unit. The main switch of the Distillation Apparatus must be off (position O). The voltage on the
nameplate (at the left-hand side of the unit) must be identical to the mains voltage. If they are identical,
connect the unit to the mains.
Please also refer to chapter 13 of these operating instructions "Connection to the Mains"..

10 / 34 Puridest Glass Distillation Apparatus 09/2020
6Water Connections
All water connections of the Distillation Apparatus, except the distillate withdrawals, are situated on the right-hand side of
the unit. Hoses for water inlet and outlet are not included in the standard scope of supply.
Inlet separate water supply
❶Part of an Option. Only fitted if a „separate water supply“ was ordered.
The water inlet for the separate water supply feeds softened or desalinated water to boiler of the Distillation Apparatus
through a solenoid valve. The hose connection must be connected to the domestic water connection ❸for pretreated
water with a ½" pressure hose with lockable water connection (cut-off valve). Both hose connections must by all means be
secured with hose clips.
Tap water inlet
②The tap water inlet provides the Distillation Apparatus with water through a solenoid valve. The hose connection must be
connected to the water mains supply with a ½" (inch, inside 12.7 mm) pressure hose and a lockable water connection (
⑤,.manual cut-off valve). Both hose connections must by all means be secured with hose clips!
Distillate outlet
④Connect a heat-resistant laboratory hose to the hose connector marked distillate outlet and lead it into a vessel to collect
the distillate.
Caution:
Distilled water leaves the Distillation Apparatus with temperatures up to 100 °C.
Danger of scaldings!

09/2020 Puridest Glass Distillation Apparatus 11 / 34
Cooling water outlet
⑥Depending on the model, cooling water drains through one or two hose connections from the unit. The hoses for cooling
water outlet must lead into a drain on a lower level. The hoses must have a slope on their complete length, cooling water
must flow off without causing backwater. The cooling water hose must be ½", should not exceed a maximum length of approx.
1 m and must be temperature-resistant.
Caution:
The cooling water leaves the Distillation Apparatus with temperatures up to 70 °C.
Danger of scaldings!
Drain Bi-stage boiler
⑦Only fitted in Glass Distillitation Apparatus models PD 2DG and PD 4 DG.
By opening the drain cock, mono distillate can be withdrawn from the bi distillate boiler. During normal operation, the drain
cock must be closed. Only then the bi distillate boiler will be filled and switched on. A ½" hose to drain the boiler for cleaning
or maintenance can be connected.
Caution:
Distilled water leaves the boiler of the Distillation Apparatus with temperatures up to 100 °C.
Danger of scaldings!
Waste water drain
⑧When the function Clean (water exchange) is activated, impure water drains from the boiler through the connection
waste water drain. Connect a ½" hose with a maximum length of approx. 1 m. The hose for waste water outlet must by all
means lead into a drain on a lower level, it must have a slope on its complete length and must not be obstructed. Make certain
that the hose can draw air at the end of the cleaning cycle in order to cut off the water contact between two electrodes
inside the Distillation Apparatus.
Water connections pos. ❶and ❸are parts of an accessory. They are only fitted if a separate water sup-
ply was specifically ordered with the unit.
Drain cock pos. ⑦is only fitted in Bi Distillation Apparatus Models PD 2 DG and PD 4 DG.
7Initiation
After assembly of all power and water connections, the cut-off valves of the main water supply (pos. ❸only for units,
equipped with separate water supply and pos. ⑤) must be opened and the main switch has to be switched on. The distillate
produced during the first 5 to 8 operating hours (mono and bi distillate) should not be used.
During down-times of the Distillation Apparatus, all cut-off valves of the water supply must always be closed.

12 / 34 Puridest Glass Distillation Apparatus 09/2020
8Functional Description
Puridest Glass Distillation Apparatus
LAUDA Puridest Glass Distillation Apparatus models PD 2 G, PD 4 G, PD 8 G, PD 2 DG and PD 4 DG work fully
automatically. After switching on the Distillation Apparatus on the main switch, both the green pilot lamp in the main switch
and the pilot lamp "Low water" will light up. The built-in solenoid valve opens and water flows through the cooling coil of the
condenser into the boiler. Water fills the boiler until the heating element is below water level. The water level is controlled by
a float switch that starts the heating element. At the same time, the pilot lamp "Low water" is switched off. After a short
time, the water in the boiler comes to the boil, steam rises into the glass condenser and condenses on the cooling coil.
In Mono Glass Distillation Apparatus (models PD 2 G, PD 4 G and PD 8 G) distilled water can now be withdrawn from the
distillate outlet.
In Bi Glass Distillation Apparatus (models PD 2 DG and PD 4 DG) the distillate produced in the mono stage is used to fill
the boiler of the bi stage until the heating element in this stage is below water level, too. In the second distillation stage,
another float switch controls the water level in the boiler and starts the heating elements. Once the water boils in the second
stage, and steam condenses on the cooling coil, bi distillate can be withdrawn from the distillate outlet of Bi Glass Distillation
Apparatus.
Protection against over-heating in case of low water
Float switches control the water level in the boilers. Power to the heating elements is cut off before the heating elements
are not below water level any more. The pilot lamp "Low water" will light up. In the event that the float switches do not cut
off power in case of low water, the temperature in the boilers is additionally controlled by thermostatic low water cut-offs.
The low water cut-offs switch off power once the temperature in the boiler exceeds 135 °C. Only the pilot lamp in the main
switch will remain on.
Glass Distillation Apparatus with separate water supply
Only factory installation is possible.
The accessory "separate water supply" serves to feed the boiler with softened or desalinated water, and the cooling coil with
phosphatized or normal tap water. The quantity of inflowing process water is controlled by a float switch and a solenoid valve.
The amount of inflowing water is limited to the amount of water evaporated
Owing to the separation of cooling and tap water, the water fed to the boiler is not pre-heated, the efficiency of the still is
therefore reduced by approx. 10-15 %.
Glass Distillation Apparatus with level control switch for external storage tank
A float switch, mounted to a plastic tube, is to be led into a storage vessel (to be provided by the users, not available from
us). When the storage vessel is full, power and water supply to the Distillation Apparatus are cut off by the level control
switch through the unit's electronic control.

09/2020 Puridest Glass Distillation Apparatus 13 / 34
9Maintenance, Service and Trouble Shooting
Caution:
Before service and maintenance always let the Glass Distillation Apparatus cool down!
Danger of scaldings!
Caution:
Before opening the Distillation Apparatus and before cleaning always cut off power (pull
the plug or switch the main switch off).
Danger of electrical shocks!
Descaling
During the rinsing process contaminated water is merely exchanged against clean water. Scale deposits in the boiler are
not removed. First press key "cleaning" to start the rinsing process. When, at the end of this process, the boiler is drained,
switch off the Distillation Apparatus on the main switch.
Remove the front screen (lift by the grip holes, tilt to the front and pull down) and pour approx. 100 ml commercial de-
scaling agent (e. g. "rea-calc®" by M/s CHEMOTEC GmbH, 63486 Bruchköbel, Germany) into the front glass funnel
which is on the right-hand side next to the boiler.
After that switch on the Distillation Apparatus and wait until the boiler is filled with water and the heating element is
switched on. When the solution has reached a temperature of maximum 70 °C, switch the Distillation Apparatus off.
Make absolutely sure not to bring the solution to a boil. Allow to react for approx. 1 to 2 hours with the scale deposits. Af-
ter the reaction time of the descaling solution, switch on the Distillation Apparatus again and press key "Clean" to start the
rinsing process. The solution is rinsed and exchanged against clean water, and the Distillation Apparatus will restart normal
operation. Descaling and rinsing processes can be repeated at any time, if required. After descaling, the first few litres of
distillate should not be used as it might contain traces of the evaporated descaling agent.
For Bi Glass Distillation Apparatus (models PD 2 DG and PD 4 DG), the contents of the back boiler (second stage)
should also be discarded after descaling by opening valve ⑦because here, too, the distillate quality might be reduced by
traces of descaling agent
Sterilising
By pressing key "Sterilise" the tap water inflow (cooling water) is cut-off for a five-minute sterilising period. The steam,
produced by the heating element is used to sterilise the pure water area (condenser) and is allowed to escape through a vent
in the lid of the Distillation Apparatus. After the sterilising period the unit restarts automatically.
Caution:
Heavy steam formation.
Danger of scaldings!

14 / 34 Puridest Glass Distillation Apparatus 09/2020
Water shortage in mono or bi stage
Float switch mono stage
Float switch bi stage
LAUDA Puridest Glass Distillation Apparatus are protected from overheating in case of low water by two separate safety
devices. Before restarting the unit, a thorough analysis of the malfunction must be carried out by a trained electrician.
After the unit being switched off in case of low water, the water flow through the unit has to be checked, starting from the
cut-off valve of the water mains, through the solenoid valves Y1, Y3 and Y4 (according to model and version) and the
cooling coils of the glass condensers, to the boiler. Furthermore, check the function of float switches S4 and S5 in the rear
part of the water overflow to the right of the boiler. The float switches can be checked by a resistance measurement after
pulling off contact strip X1.
Triggered low water cut-offs of the Distillation Apparatus must be resetted. For this, loosen the black cap nuts at the left-
hand housing wall. Inside the thread a small white plastic pin can be seen that has gently to be pressed inside (e. g. with a
pen) until a clicking sound can be heard. The Glass Distillation Apparatus being switched off during operation is presumably
always due to a defect of the unit. Models PD 2 G and PD 4 G have only one low water cut-off
Pilot lamp "Clean"
Depending on the degree of impurities in the tap and the increasing contamination of the water in the boiler, caused by the
distillation process in the mono stage boiler, a fully automatic rinsing process should be started by pressing key "Clean". The
function "Clean" is also triggered when boiling contaminated water foams up in the boiler and comes into contact with the
electrode in the mono stage boiler.
During the rinsing process, the boiler is filled with water to its upper rim and then drained completely. The contaminated
water flows off through the hose connection marked "contaminated water drain". The boiler is automatically refilled with
water until the heating element is below water level. The distillation process then restarts. The purpose of the function "Clean"
is to exchange contaminated water in the mono stage boiler against clean water.
Caution:
If the separate water supply is installed, the function "Clean" will only work partially as the low conductivity
of the industrial water (e. g. desalinated water) will prevent the water exchange being switched off. In these
cases, the Distillation Apparatus must be switched off (main switch) after the mono stage boiler is filled
with water. The unit must not be switched on again before the boiler has been completely drained through the contami-
nated water drain.

09/2020 Puridest Glass Distillation Apparatus 15 / 34
The LAUDA-GFL Puridest Glass Distillation Apparatus are produced of first class materials. Nevertheless, the unit should
only be subjected to mechanical strain within sensible limits. The powder-coated surfaces and the front screen of the unit
may be cleaned with mild detergents, if necessary.
Servicings, repairs or modifications must be carried out according to the General Engineering Standards by competent
electricians only.
Only original spare parts must be used. Always demand a detailed confirmation of the carried out tasks by the person in
charge (company, date, signature).
10 Disposal of Old Units
LAUDA-GFL will take responsibility, within the scope of the legal directives, for an environmentally sound handling and
disposal of all used LAUDA-GFL units as of the production year 1995 that are returned to us free of charge and will have
it materially recycled. Before the unit is returned, a legally binding declaration must be provided from the sender confirm-
ing that the unit is free from harmful and/or hazardous contaminations as well as from hazardous substances caused by the
previous use of the unit.
LAUDA-GFL laboratory apparatus are exclusively designed for industrial use and may not be disposed of through public
waste disposal authorities.
EAR Registration Number WEEE-ID.NO.DE 67770231

16 / 34 Puridest Glass Distillation Apparatus 09/2020
11 Technical Data
Puridest Glass Distillation Apparatus models PD 2 G, PD 4 G and PD 8 G
PD 2 G
PD 4 G
Exterior dimensions (W x D x H)
680 mm x 200 mm x 410 mm
680 mm x 200 mm x 410 mm
Distillation capacity
2 l / h mono distillate
4 l / h mono distillate
Distillate quality
Mono distillate
approx. 2.2 µS / cm at 25 °C
in conformity with DAB, bacteria and pyrogen
free, low gas content.
Mono distillate
approx. 2.2 µS / cm at 25 °C
in conformity with DAB, bacteria and pyrogen
free, low gas content.
The conductivity of the distilled water is directly related to the chemical composition of the raw water. Components of the raw water having the
same or a lower evaporation point than water may deteriorate the conductivity.
Cooling water required
48 l / h
72 l / h
Low water cut-off
Electromechanical temperature limiter, with ca-
pillary tube sensor.
Switch-off temperature 135 °C / -15 K
Electromechanical temperature limiter, with ca-
pillary tube sensor.
Switch-off temperature 135 °C / -15 K
Water pressure min. / max.
> 3 bar / 7 bar
> 43.5 psi / 101.5 psi
> 3 bar / 7 bar
> 43.5 psi / 101.5 psi
Electrical connection
Mains supply
Internal fuse
On-site fuse
230 V +/-10 %, 50 / 60 Hz, 1.5 kW
Mains connection cable with Schuko plug,
internal 2 x 8 A inert, on-site 10 A inert
230 V +/-10 %, 50 / 60 Hz, 3.0 kW
Mains connection cable with Schuko plug,
internal 2 x 15 A inert, on-site 16 A inert
Caution! Mains voltage deviations, even with the mentioned limits, influence the quantity of distillate produced.
Protection class / - type
I / IP20
I / IP20
Surrounding conditions
Use only inside buildings (not in potentially explo-
sive areas).
Use only inside buildings (not in potentially ex-
plosive areas).
Height above MSL
up to 2000 m MSL
up to 2000 m MSL
Ambient temperature
+10 °C to +40 °C
+10 °C to +40 °C
Humidity
max. 80 % rel. humidity to 31 °C, decreasing to
40 % rel. humidity at 40 °C
max. 80 % rel. humidity to 31 °C, decreasing to
40 % rel. humidity at 40 °C
Net Weight
16.2 kg
16.2 kg
Weight with water filling
20.2 kg
20.2 kg

09/2020 Puridest Glass Distillation Apparatus 17 / 34
PD 8 G
Exterior dimensions (W x D x H)
685 mm x 360 mm x 410 mm
Distillation capacity
8 l / h mono distillate
Distillate quality
Mono distillate
approx. 2.2 µS / cm at 25 °C
in conformity with DAB, bacteria and pyrogen free,
low gas content.
The conductivity of the distilled water is directly related to the chemical composition of the raw water. Components of the raw water having the same
or a lower evaporation point than water may deteriorate the conductivity.
Cooling water required
144 l / h
Low water cut-off
Electromechanical temperature limiter, with capillary
tube sensor.
Switch-off temperature 135 °C / -15 K
Water pressure min. / max.
> 3 bar / 7 bar
> 43.5 psi / 101.5 psi
Electrical connection
Mains supply
Internal fuse
On-site fuse
220 V / 3 ~ / PE, +/-10 %, 50 / 60 Hz, 6.0 kW
Mains connection cable for permanent connection to
the mains, on-site 3 x 25 A inert
or
400 V / 3 ~ / N / PE, +/-10 %, 50 / 60 Hz, 6.0 kW
Mains connection cable for permanent connection to
the mains, on-site 3 x 16 A inert
Caution! Mains voltage deviations, even with the mentioned limits, influence the quantity of distillate produced.
Protection class / - type
I / IP20
Surrounding conditions
Use only inside buildings (not in potentially explosive
areas).
Height above MSL
up to 2000 m MSL
Ambient temperature
+10 °C to +40 °C
Humidity
max. 80 % rel. humidity to 31 °C, decreasing to 40 %
rel. humidity at 40 °C
Net Weight
26.0 kg
Weight with water filling
34.0 kg

18 / 34 Puridest Glass Distillation Apparatus 09/2020
Puridest Glass Bi Distillation Apparatus models PD 2 DG and PD 4 DG
PD 2 DG
PD 4 DG
Exterior dimensions (W x D x H)
685 mm x 360 mm x 410 mm
685 mm x 360 mm x 410 mm
Distillation capacity
2 l / h bi distillate
4 l / h bi distillate
Distillate quality
Bi distillate
approx. 1.6 µS / cm at 25 °C
in conformity with DAB, bacteria and pyrogen free, low
gas content.
Bi distillate
approx. 1.6 µS / cm at 25 °C
in conformity with DAB, bacteria and pyrogen free, low
gas content.
The conductivity of the distilled water is directly related to the chemical composition of the raw water. Components of the raw water having the same or
a lower evaporation point than water may deteriorate the conductivity.
Cooling water required
72 l / h
144 l / h
Low water cut-off
Electromechanical temperature limiter, with capillary
tube sensor.
Switch-off temperature 135 °C / -15 K
Electromechanical temperature limiter, with capillary
tube sensor.
Switch-off temperature 135 °C / -15 K
Water pressure min. / max.
> 3 bar / 7 bar
> 43.5 psi / 101.5 psi
> 3 bar / 7 bar
> 43.5 psi / 101.5 psi
Electrical connection
Mains supply /
On-site fuse
230 V +/-10 %, 50 / 60 Hz, 2.9 kW
Mains connection cable with Schuko plug,
internal 2 x 15 A inert, on-site 16 A inert
220 V / 3 ~ / PE, +/-10 %, 50 / 60 Hz, 5.8 kW
Mains connection cable for permanent connection to
the mains, on-site 3 x 25 A inert
or
400 V / 3 ~ / N / PE, +/-10 %, 50 / 60 Hz, 5.8 kW
Mains connection cable for permanent connection to
the mains, on-site 3 x 16 A inert
Caution! Mains voltage deviations, even with the mentioned limits, influence the quantity of distillate produced.
Protection class / - type
I / IP20
I / IP20
Surrounding conditions
Use only inside buildings (not in potentially explosive ar-
eas).
Use only inside buildings (not in potentially explosive ar-
eas).
Height above MSL
up to 2000 m MSL
up to 2000 m MSL
Ambient temperature
+10 °C to +40 °C
+10 °C to +40 °C
Humidity
max. 80 % rel. humidity to 31 °C, decreasing to 40 %
rel. humidity at 40 °C
max. 80 % rel. humidity to 31 °C, decreasing to 40 %
rel. humidity at 40 °C
Net Weight
43.0 kg
43.0 kg
Weight with water filling
68.4 kg
68.4 kg

09/2020 Puridest Glass Distillation Apparatus 19 / 34
12 Circuit diagram
A1 Electronic level switch
B1 Mass (for B2 –B3 –S4 –S5)
B2 Electrode Cleaning
B3 Electrode Contaminated Water Drain
E1 Glass heating element 1.5 kW
E2 Glass heating element 1.5 kW
E3 Glass heating element 1.4 kW
E4 Glass heating element 1.4 kW
E5 Glass heating element 1.5 kW
E6 Glass heating element 1.5 kW
F1 Mains fuse 6.3 x 32 mm, 8 A inert (Model PD 2 G), 15 A inert (Models PD 4 G and PD 2 DG)
F2 Mains fuse 6.3 x 32 mm, 8 A inert (Model PD 2 G), 15 A inert (Models PD 4 G and PD 2 DG)
F3 Low water cut-off (front boiler stage)
F4 Low water cut-off (rear boiler stage)
F5 Fuse 400 mA inert on A1
H1 Pilot lamp Cleaning
H2 Pilot lamp Sterilising
H3 Pilot lamp Low Water
K1 Contactor mains voltage
K2 Contactor heating element mono stage
K2/1 Contactor heating element mono stage
K2/2 Contactor heating element mono stage
K3 Contactor heating element bi stage
S1 Main switch
S2 Switch Cleaning
S3 Switch Sterilising
S4 Float switch bi stage
S5 Float switch mono stage
S6 Float switch, for external storage tank, Option
S7 Float switch process water
X1 Supply terminal sensor
X2 Supply terminal control
Y1 Solenoid valve cooling and process water
Y2 Solenoid valve cleaning
Y3 Solenoid valve cooling water
Y4 Solenoid valve process water

20 / 34 Puridest Glass Distillation Apparatus 09/2020
PD 2 G for 230 V 50 / 60 Hz
PD 4 G for 230 V 50 / 60 Hz