Memmert WTB 50 User manual

Operating manual
WTB
WTB Waterbath
www.memmert.com

Table of Contents
2 D49019 05/2023
Table of Contents
1. About this Manual 4
2. Safety 6
2.1 Terms and Symbols Used ......................................................................................................................................... 6
2.1.1 Terms Used.................................................................................................................................................. 6
2.1.2 Symbols Used .............................................................................................................................................. 6
2.2 Product Safety and Dangers...................................................................................................................................... 7
2.3 Requirements to be met by Operating Personnel........................................................................................................ 8
2.4 Responsibility of the Owner ...................................................................................................................................... 8
2.5 Intended Use............................................................................................................................................................ 8
2.6 Changes and Alterations........................................................................................................................................... 9
2.7 Behaviour in case of Malfunctions and Irregularities .................................................................................................. 9
2.8 Switching off the Unit in an Emergency...................................................................................................................... 9
3. Construction and Description 10
3.1 Design..................................................................................................................................................................... 10
3.2 Description of Function ............................................................................................................................................ 10
3.3 Materials ................................................................................................................................................................. 10
3.4 Electrical Equipment................................................................................................................................................. 11
3.5 Connections and Interfaces ...................................................................................................................................... 11
3.6 Nameplate............................................................................................................................................................... 11
3.7 Technical Data......................................................................................................................................................... 12
3.8 Applied Directives and Standards.............................................................................................................................. 13
3.9 Ambient Conditions.................................................................................................................................................. 13
3.10 Scope of Delivery ..................................................................................................................................................... 13
4. Delivery, Transport and Setting Up 15
4.1 Safety...................................................................................................................................................................... 15
4.2 Delivery ................................................................................................................................................................... 16
4.3 Transport................................................................................................................................................................. 16
4.4 Unpacking................................................................................................................................................................ 16
4.5 Storage after Delivery............................................................................................................................................... 16
4.6 Setting Up................................................................................................................................................................ 16
4.6.1 Preconditions............................................................................................................................................... 17
5. Putting into Operation 18
5.1 Putting into Operation for the First Time.................................................................................................................... 18
5.2 Connecting the Unit to the Power Supply ................................................................................................................... 18
5.3 Filling ...................................................................................................................................................................... 19
5.4 Water specifications ................................................................................................................................................ 19
5.5 Switching on Unit ..................................................................................................................................................... 20

Table of Contents
3 D49019 05/2023
6. Operation and Control 21
6.1 Home Screen and Settings........................................................................................................................................ 21
6.2 CustomView ............................................................................................................................................................ 22
6.3 Unit Information....................................................................................................................................................... 22
6.4 Values and Unit........................................................................................................................................................ 23
6.5 Emptying ................................................................................................................................................................. 23
6.6 Calibration............................................................................................................................................................... 23
7. Malfunctions, Warning and Error Messages 26
7.1 Warning Message of the Monitoring Function............................................................................................................ 26
7.1.1 Temperature Monitoring ............................................................................................................................... 26
7.1.2 Malfunctions, Operating Problems and Unit Errors ......................................................................................... 27
7.1.3 Power Failure............................................................................................................................................... 28
8. Maintenance and Servicing 29
8.1 Cleaning .................................................................................................................................................................. 29
8.2 Decontamination...................................................................................................................................................... 30
8.3 Regular Maintenance................................................................................................................................................ 30
8.4 Repairs and Service.................................................................................................................................................. 30
9. Storage and Disposal 31
9.1 Storage.................................................................................................................................................................... 31
9.2 Disposal .................................................................................................................................................................. 31

About this Manual
4 D49019 05/2023
1. About this Manual
Purpose and target audience
This manual describes the design, function, transport, operation and maintenance of the
product series WATERBATHS WTB. It is intended for use by trained personnel employed by
the owner who are tasked with operating and/or maintaining the unit.
If you have been tasked with working on the unit, read this manual carefully before starting
work. Familiarise yourself with the safety instructions. Only perform work that is described
in this manual. If there is anything you do not understand, or if any information is lacking,
ask your line manager or contact the manufacturer. Do not take any course of action on
your own initiative.
Versions
The unit is available in different equipment versions and sizes. If certain features or
functions are only available in certain equipment versions, this is indicated at the relevant
points in this manual.
The functions described in this manual relate to the most recent firmware version.
Due to the different equipment versions and sizes, the illustrations in this manual may be
slightly different to your product. However, the product is identical in terms of its
operation and function.
Further applicable documents
In addition to this manual, please observe the following documents:
■Service manual:
To carry out service and repair work you will require the separate service manual. Manuals
can be requested from Memmert International After Sales or downloaded from
www.memmert.com.
■Operating manual for accessories
For accessory parts such as the shaking device and circulating pump device you will
require the separate operating manual.
Retaining and passing on this manual
This operating manual belongs to the unit and must always be kept in a location where it
can be easily found by those working with the unit. It is the responsibility of the owner to
ensure that persons who work on the unit know where this operating manual is. We
recommend always storing it in a safe place near the unit.
Ensure that the manual is not damaged by heat or humidity. If the unit is sold or
transported and re-installed at another location, this operating manual must be handed
over with the unit. The current version of this operating manual is also available in PDF
format at www.memmert.com.
Address and customer service
Manufacturer address
Memmert GmbH + Co. KG
Äußere Rittersbacher Straße 38 | D-91126 Schwabach | Germany
Tel. [phone]
E-mail: [email protected]
www.memmert.com

About this Manual
5 D49019 05/2023
International After Sales
Memmert GmbH + Co. KG
Willi-Memmert-Straße 90-96 | D-91186 Büchenbach | Germany
Tel. [phone]
E-mail: [email protected]
www.memmert.com
If you have any queries, please always quote the product number on the nameplate.

Safety
6 D49019 05/2023
2. Safety
2.1 Terms and Symbols Used
In this manual and on the unit itself, certain recurring terms and symbols are used to warn
you of hazards or give you information that is important in order to prevent injury or
damage. To avoid accidents and damage, observe and follow these instructions. These
terms and symbols are explained below.
2.1.1 Terms Used
Warns of a dangerous situation that will result directly in death or serious (irreversible)
injury.
Warns of a dangerous situation that could result in death or serious physical injury.
Warns of a dangerous situation that could result in moderate or minor physical injury.
Warns of damage to property.
2.1.2 Symbols Used
Prohibition – Do not lift unit Risk of explosion
Warning - hot steam Caution – Danger of electric shock
General warning sign Warning - flammable substances
Caution – Hot surfaces Warning - vaporising liquids
Notice – Wear protective gloves Notice – Disconnect power plug
Notice – Observe information in separate
manual

Safety
7 D49019 05/2023
2.2 Product Safety and Dangers
The units described in this manual are technically sophisticated, manufactured using high-
quality materials and subject to many hours of testing in the factory. They reflect the state
of the art and comply with recognised technical safety regulations. However, there are still
risks involved, even when the units are used as intended. These are described below.
DANGER
Risk of electric shock due to damage to the heater
The heating system can be damaged due to impact or excessive loads on the tray, e.g.
heavy objects falling into the tray.
– Check the tray of the appliance for damage before putting it into operation.
– Do not allow heavy objects to drop into the tray.
– When loading the water bath, do not exceed the maximum weight
(see }3.7Technical Data).
DANGER
Danger due to electric shock
Penetration of liquid into the unit can cause electric shocks and short circuits.
– Opening the electronics box is prohibited.
– Protect the unit from splashing water.
– Switch off the unit and disconnect the mains plug before cleaning and maintenance
work.
– The unit must not be wet cleaned and disinfected. Allow the unit to dry completely
before putting it back into operation.
WARNING
Hot tempering medium
During operation, the tempering medium is heated up to +100°C. This may lead to burns
when coming in contact with skin.
– Please allow the tempering medium to cool down before removing the flat lid.
– Please allow the tempering medium to cool down before removing the load.
WARNING
Poisonous or explosive vapours and gases
When loading the unit with an unsuitable load, poisonous or explosive vapours or gases
may be produced. This could cause the unit to explode, and persons could be severely
injured or poisoned.
– The unit may only be loaded with materials and substances which cannot form any
toxic or explosive vapours at the set temperature and which cannot explode, burst or
ignite.
WARNING
Fire hazard
Operating without a tempering medium can cause the unit to overheat and pose a fire
hazard.
– Do not operate the waterbath without a tempering medium.
– Always observe the minimum fill level for the tray.

Safety
8 D49019 05/2023
WARNING
Hot drain valve
When draining the tempering agent, there is a risk of burning and scalding.
– Open the drain valve by turning it 3 to 4 times to the maximum drain speed for the
tempering agent. Be careful not to unscrew the drain valve completely.
– Do not discharge hot or boiling water through the drain valve.
– Use heat-resistant / waterproof protective gloves to turn the drain valve on/off.
CAUTION
Hot steam
Hot steam can build up inside the unit. You may be scalded when opening the lid or
coming into close contact with the surface of the water.
– Keep a safe distance away from the water’s surface when opening the lid and when
removing test objects.
See also
2Technical Data [}12]
2.3 Requirements to be met by Operating Personnel
The unit may only be operated and maintained by persons who are of legal age and have
been instructed accordingly. It is intended for use by trained personnel employed by the
owner who are tasked with operating and/or maintaining the unit.
Repairs may only be performed by qualified electricians. The regulations in the separate
service manual must be observed.
2.4 Responsibility of the Owner
The owner of the unit
■is responsible for the flawless condition of the unit and for operating it in accordance with
its intended use;
■is responsible for ensuring that persons who operate or service the unit are qualified to do
this, have been instructed accordingly and are familiar with these operating instructions;
■must know the applicable guidelines, requirements and operational safety regulations, and
train staff accordingly;
■is responsible for ensuring that unauthorised persons cannot access the unit;
■is responsible for ensuring that the maintenance plan is adhered to and that maintenance
work is properly carried out;
■has to ensure that the unit and its surroundings are kept clean and tidy, for example
through corresponding instructions and inspections;
■is responsible for ensuring that personal protective clothing is worn by operating
personnel, e.g. work clothes, safety shoes and protective gloves.
2.5 Intended Use
Memmert waterbaths are intended for indirect tempering of samples or materials. Water
should be used as the tempering medium. A wide variety of samples are tempered in a
range from approx. 5°C above room temperature to 100°C. This can be done in suitable
vessels such as test tubes, Erlenmeyer flasks etc., or if the sample to be tempered is
suitable, in direct contact with the tempering medium.
It is not possible to include all possible applications. Application is at the operator’s
discretion and is the responsibility of this person.

Safety
9 D49019 05/2023
Any other use is improper and may result in hazards and damage. The unit is not
explosion-proof (does not comply with the German occupational health and safety
regulation VBG 24). The unit may only be loaded with materials and substances which
cannot form any toxic or explosive vapours at the set temperature and which cannot
explode, burst or ignite. The unit must not be used for the drying, evaporation and burning-
in of paints or similar materials, the solvents of which could form an explosive mixture
when combined with air. If there is any doubt as to the composition of materials, they
must not be loaded into the unit. Potentially explosive gas-air mixtures must not form,
neither in the working chamber nor in the direct vicinity of the unit.
2.6 Changes and Alterations
Unauthorised changes or alterations must not be made to the unit. No parts may be added
or installed which have not been approved by the manufacturer.
Unauthorised changes or alterations result in the CE declaration of conformity losing its
validity, and the unit must no longer be operated.
The manufacturer is not liable for any damage, danger or injuries that result from
unauthorised changes or alterations, or from non-compliance with the provisions in this
manual.
2.7 Behaviour in case of Malfunctions and Irregularities
NOTICE
The rocker switch must be freely accessible.
The unit must only be used in a flawless condition. If you, as the operator, notice
irregularities, malfunctions or damage, immediately turn off the unit and inform your line
manager.
iYou can find information on troubleshooting in the chapter }7Malfunctions, Warning and
Error Messages.
See also
2Malfunctions, Warning and Error Messages [}26]
2.8 Switching off the Unit in an Emergency
Push the On/Off switch on the unit and disconnect power plug. This disconnects the unit
from the power supply at all poles.

Construction and Description
10 D49019 05/2023
3. Construction and Description
3.1 Design
Unit overview – front view
1
2
3
4
5
6
1 Handle 2 Lid
3 Safety label “Caution: steam” 4 Safety label “Caution: hot”
5 Touch display 3.5" 6 Drain valve
Unit overview – rear view
1
2
3
4
56
1 Safety label “Caution: voltage” 2 Safety label “General caution”
3 Main switch 4 Mains connection
5 Nameplate 6 Safety label “Caution hot”
3.2 Description of Function
Memmert waterbaths are heated using the Memmert heating concept, which has proven
itself over decades. A digital sensor measures the temperature at the waterbath tray. To
prevent dry running, the waterbath automatically shuts off if the fill level of the tempering
medium is insufficient.
3.3 Materials
Components Material
Housing (lid + side panels) Stainless steel 1.4301 – ASTM 304
Interior (tray) Stainless steel 1.4301 – ASTM 304

Construction and Description
11 D49019 05/2023
Components Material
Accessories (floor grid, shaking device,
basket, insert racks, test tube racks,
clamps)
Stainless steel 1.4301 – ASTM 304
Screws and hinges Stainless steel 1.4301 – ASTM 304
Drain valve Stainless steel 1.4301 – ASTM 304
Drain system Stainless steel 1.4301 – ASTM 304
Silicone hose Silicone – Shore A translucent
iThe chamber load of the unit must be carefully checked for chemical compatibility with
the above materials.
3.4 Electrical Equipment
■Operating voltage and current consumption: See }3.6Nameplate or
}3.7Technical Data
■Degree of protection IP20 acc. to DINEN60529
■Protection classI, i.e. operating insulation with PE terminal in accordance with EN60664-1
■Interference suppression acc. to EN55011 classB
■Device protection fuse: F15H250V
■Electric thermal cutoff fuse: Thermal fuse 200°C/10A
See also
2Technical Data [}12]
2Nameplate [}11]
3.5 Connections and Interfaces
Electrical connection
NOTICE
The waterbath may only be connected to a socket with a PE conductor connection.
This unit is designed for operation on an electrical power system with a maximum system
impedance Zmax at the point of transfer (service line) of 0.292Ohm. The operator must
ensure that the unit is only operated on an electrical power system that meets these
requirements.
If necessary, ask your local utility company what the system impedance is. Observe the
country-specific regulations when making connections (e.g. in Germany DIN VDE 0100
with earth leakage circuit breaker).
3.6 Nameplate
The nameplate provides information about the unit model, manufacturer and technical
data. It is attached to the back of the unit, on the right near the mains plug.

Construction and Description
12 D49019 05/2023
MSN: LF21.0000
12.2A 2800W
Nominal temp.: 10-100°C
1
3
2
5
10
9
8
7
6
4
MSN: LF21.0000
12.2A 2800W
Nominal temp.: 10-100°C
1 Type designation 2 Operating voltage
3 Applied standard 4 Degree of protection
5 CE mark 6 Manufacturer's address
7 Information regarding disposal 8 Nominal temperature
9 Connected loads / power ratings 10 Serial number
3.7 Technical Data
Unit sizes 6 11 15 24 35 50
Stainless steel interior Volume l 7.5 10 17.1 23.1 37.5 51
Length A mm 277 267 482 472 602 592
Width B mm 217 207 277 267 482 472
Height C mm 200 150 150 200 150 200
Patterned stainless steel
housing
Length D mm 479 479 749 749 868 868
Width E mm 272 322 272 322 272 322
Height (with flat lid) F1 mm 272 322 322 272 272 322
Height (with sloping lid) F2 mm 375 425 375 425 425 375
Max. weight load kg 12 12 25 25 50 50
Temperature Operating temperature
range
°C min. 5 above room temperature up to +100 (with lid,
depending on ambient pressure)
Setting temperature range °C +10 up to +100
Adjustment precision °C 0.1
Electrical data Power consumption 230V W 1,000 1,000 1,420 1,420 2,800 2,800
Power consumption 115V W 1,000 1,000 1,420 1,420 1,800 1800
Max. current consumption 230V A 4,4 4,4 6,2 6,2 12,2 12,2
Max. current consumption 115V A 8,7 8,7 12,4 12,4 15,7 15,7
Packaging data Net weight kg 11 12 18 20 30 33
Gross weight kg 13 14 21 23 34 37
Length mm 579 579 849 849 968 968
Width mm 389 389 449 449 525 654
Height mm 475 525 475 525 475 525
Schutzart DINEN 60529 - IP20
Type: WTB50Type: WTB50
~230 V 50/60 Hz~230 V 50/60 Hz
DIN12876-Kl.: 1DIN12876-Kl.: 1

Construction and Description
13 D49019 05/2023
3.8 Applied Directives and Standards
Declaration of conformity
You can download the EC declaration of conformity of the unit online under:
www.memmert.com/downloads/downloads/ce-statement/#!filters=%7B%7D
REACH regulation
Under the REACH regulation, Memmert provides the information on the chemical
substances in Memmert units online at:
www.memmert.com/de/reach-rohs/
3.9 Ambient Conditions
■The unit must only be used in enclosed areas and in the ambient conditions listed below:
Ambient temperature +5ºC to +40ºC
Air humidity max. 80% non-condensing
Overvoltage category II
Contamination level 2
Installation altitude a.s.l. 2000m a.s.l.
Maximum mains voltage fluctuations AC 115V (± 10%)
AC 230V (± 10%)
■The unit must not be used in ex zones. The ambient air must not contain any explosive
dusts, gases, vapours or gas-air mixtures. The unit is not explosion-proof.
■Heavy dust production or aggressive vapours in the vicinity of the unit could lead to
sedimentation in the interior and, as a consequence, could result in short circuits or
damage to electrical parts. For this reason, sufficient measures to prevent large
accumulations of dust or aggressive vapours should be taken.
3.10 Scope of Delivery
Standard delivery
■Waterbath
■Mains connection cable
■Quick guide

Construction and Description
14 D49019 05/2023
■Sloping lid
Optional accessories
■Flat lid
■Floor grid
■Clamps, insert racks and test tube racks
■Pumping device
■Factory calibration certificate
■IQ/OQ document with works test data for units

Delivery, Transport and Setting Up
15 D49019 05/2023
4. Delivery, Transport and Setting Up
4.1 Safety
WARNING
Condensation in the electrical components may cause short circuits.
Due to temperature fluctuations during transport, condensation may form inside the unit.
– After transporting or storing the unit in humid conditions, remove it from its packaging
and allow it to acclimatise for at least 24hours in normal ambient conditions.
– Do not connect the unit to the power supply during this time.
CAUTION
Lifting the unit incorrectly
The unit is heavy. The unit is heavy, so you could injure yourself if you try to lift it on your
own.
– Make sure that a sufficient number of people are on hand to lift and carry the unit.
– Larger units must not be carried, and only transported by pallet truck or forklift.
6 11 15 24 35 50
CAUTION
Crushing hazard due to heavy equipment
The unit is heavy. Crushing injuries to hands or feet can occur when transporting and
installing the unit.
– Wear protective gloves and safety boots.
– Grab hold of the sides of the unit to carry it.

Delivery, Transport and Setting Up
16 D49019 05/2023
CAUTION
Risk of injury due to the unit falling during transport
The unit could fall over and injure you.
– If a lid is mounted, do not transport the unit while it is open.
– Never tilt the unit and only transport it empty and in the upright position.
4.2 Delivery
■The unit is packed in a cardboard box.
4.3 Transport
The unit can be transported in different ways depending on its size:
■Carrying; lift the unit at the designated handle positions
4.4 Unpacking
■To avoid damage, do not unpack the unit until you reach the installation site.
■Remove the cardboard packaging by pulling it upwards or carefully cutting along an edge
or unscrew and remove wooden crate.
Checking for completeness and transport damage
■Check the delivery note to ensure the delivery is complete.
■Check the unit for damage.
If you notice deviations from the scope of delivery, damage or anything unusual, do not put
the unit into operation and inform the haulage company and the manufacturer.
Disposing of packaging material
■Dispose of the packaging material (cardboard, wood, foil) in accordance with the
applicable disposal regulations for the respective material in your country.
4.5 Storage after Delivery
If the unit is initially to be stored after delivery:
■Observe storage conditions (see }9.1Storage)
See also
2Storage [}31]
4.6 Setting Up
CAUTION
Tipping hazard
If the unit is set up on an uneven surface, it can topple over and injure you or other people.
– Always place the unit on an even, non-slip surface with sufficient load-bearing
capacity.

Delivery, Transport and Setting Up
17 D49019 05/2023
CAUTION
Fire hazard
The surfaces of the unit may overheat during operation and overheat heat-sensitive
surfaces in close proximity to the unit.
– Always place the unit on a heat-resistant, fireproof and non-flammable surface and
– maintain the specified clearances around the unit.
4.6.1 Preconditions
üThe installation site must be flat and horizontal and must be able to reliably bear the
weight of the unit (see
}3.7Technical Data). Place the unit on a heat-resistant, fireproof and non-flammable
surface.
üA 230 V or 115 V power connection must be available at the installation site,
depending on the version (see }3.6Nameplate).
üThe clearance from the ceiling must not be less than 75cm and the side clearance
from walls or nearby units must not be less than 30cm. Sufficient air circulation in the
vicinity of the unit must be guaranteed at all times.
üThe waterbath must be positioned so that when the lid is opened there is sufficient
clearance from the water surface, as hot steam can build up in the unit.
▶Place the unit in the designated position as shown below.
300mm 300mm 300mm
750mm
See also
2Technical Data [}12]
2Nameplate [}11]

Putting into Operation
18 D49019 05/2023
5. Putting into Operation
5.1 Putting into Operation for the First Time
WARNING
Condensation in the electrical components may cause short circuits.
Due to temperature fluctuations during transport, condensation may form inside the unit.
– After transporting or storing the unit in humid conditions, remove it from its packaging
and allow it to acclimatise for at least 24hours in normal ambient conditions.
– Do not connect the unit to the power supply during this time.
WARNING
Hot steam
Hot steam can build up inside the unit when it is opened and when it is switched on and
off. You may be scalded when opening the lid or coming into close contact with the
surface of the water.
– Keep a safe distance away from the water’s surface when opening the lid and when
removing test objects.
NOTICE
When putting the unit into operation for the first time, do not leave it unattended until it
has reached a steady state.
– Please observe the national regulations when connecting the unit.
– Observe the connected loads and power ratings (see }3.6Nameplate and
}3.7Technical Data).
– Be sure to establish a safe PE conductor connection.
NOTICE
Only transport the waterbath when empty.
See also
2Nameplate [}11]
2Technical Data [}12]
5.2 Connecting the Unit to the Power Supply
NOTICE
The unit may only be operated with the original mains cable supplied by Memmert. Other
mains cables, especially inadequately rated mains cables, must not be used.
iWhen connecting, observe the country-specific regulations (e.g. in Germany DINVDE 0100
with earth leakage circuit breaker).

Putting into Operation
19 D49019 05/2023
Route the power cable so that
■nobody can trip over it.
■it cannot come into contact with any hot parts.
■it is easily accessible at all times and the plug can be pulled out quickly in the event of
a fault or emergency, for example.
5.3 Filling
Observe the following points before filling the waterbath:
■The waterbath may not be operated while empty.
■Check that the drain valve is closed before filling.
■Observe the minimum fill level of the waterbath.
■Observe the maximum fill level when filling and loading the waterbath, which must not be
exceeded.
Product size Maximum fill level Minimum fill level
6 114mm 40mm
11 164mm 40mm
15 114mm 40mm
24 164mm 40mm
35 114mm 40mm
50 164mm 40mm
5.4 Water specifications
Only water with the following specifications may be used in Memmert units:
■Demineralised water and distilled water (a variety of terms are used commercially for this)
that is residue-free when it evaporates, according to regulation VDE0510 and DIN43530
■Conductivity of approx. >1; <10µS/cm
■neutral pH value (between 5 and 7)
■Chlorine-free

Putting into Operation
20 D49019 05/2023
The use of double-distilled water / ultrapure water / other highly purified water (a variety of
terms are also commonly used) with an electrical conductance below about < 1 µS/cm
must be avoided. The use of such water is not necessary and could damage the unit by
corroding metallic components on and in the unit. Unsuitable water with an electrical
conductance greater than 10µS/cm will damage the unit due to the residues that occur
during evaporation and vaporisation, including the formation of limescale deposits.
5.5 Switching on Unit
Press the main switch on the back of the unit.