Memmert WTB User manual

www.memmert.com
Operating manual
WTB
WTB water bath

2 03/2021
About this manual
Purpose and target audience
This manual describes the design, function, transport, operation and maintenance of
WTB water baths. It is intended for use by trained personnel of the owner, who have
the task of operating and/or maintaining the respective appliance. If you are asked
to work on the appliance, read this manual carefully before starting. Familiarise your-
self with the safety regulations. Only perform work that is described in this manual.
If there is something you do not understand, or certain information is missing, ask
your manager or contact the manufacturer. Do not do anything without authorisation.
Versions
The appliance is available in different congurations and sizes. If specic equipment
features or functions are available only for certain congurations, this is indicated at
the relevant points in this manual. The functions described in this manual refer to the
latest rmware version. Due to individual congurations and sizes, illustrations in this
manual may be slightly different to the actual appearance. Function and operation are
identical.
Other documents to be observed:
■For service and repair work, observe the separate service manual
■separate operating manual for accessory parts, such as shaking device, cooling unit
and circulation pump device
Storage and resale
This operating manual belongs with the appliance and should always be stored where
persons working on the appliance have access to it. It is the owner's responsibility to
ensure that persons who are working on or are going to work on the appliance know
where to nd the operating manual. We recommend that it is always stored in a protect-
ed location close to the appliance. Make sure that the operating manual is not damaged
by heat or humidity. If the appliance is resold or transported and then set up again at
a different location, the operating manual must remain with it. The current version of
this operating manual in PDF format is also available for download from http://www.
memmert.com/
Manufacturer address and customer service
MEMMERT GmbH + Co. KG
Willi-Memmert-Str. 90-96
91186 Büchenbach
Germany
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Internet: www.memmert.com
Customer service:
Hotline: [phone]
Service fax: +49(0)91719792979
Email: [e-mail]
For service enquiries, please always specify the appliance number
given on the type plate.

3 03/2021
Content
1. Safety 5
1.1 Terms and signs used ............................................................................................................................................................................ 5
1.2 Product safety and dangers ................................................................................................................................................................... 6
1.3 Requirements of the operating personnel.............................................................................................................................................. 7
1.4 Responsibility of the owner .................................................................................................................................................................... 7
1.5 Intended use ........................................................................................................................................................................................... 7
1.6 Changes and alterations......................................................................................................................................................................... 7
1.7 Behaviour in case of malfunctions and irregularities............................................................................................................................. 8
1.8 Switching off the appliance in an emergency ........................................................................................................................................ 8
2. Construction and description 9
2.1 Design..................................................................................................................................................................................................... 9
2.2 Description.............................................................................................................................................................................................. 9
2.3 Material................................................................................................................................................................................................. 10
2.4 Electrical equipment............................................................................................................................................................................. 10
2.5 Connections and interfaces.................................................................................................................................................................. 10
2.6 Designation (nameplate) ...................................................................................................................................................................... 11
2.7 Technical data ...................................................................................................................................................................................... 12
2.8 Applied directives and standards ......................................................................................................................................................... 13
2.9 Ambient conditions............................................................................................................................................................................... 13
2.10 Scope of delivery .................................................................................................................................................................................. 13
3. Delivery, Transport and Setting Up 14
3.1 Safety.................................................................................................................................................................................................... 14
3.2 Delivery/unpacking ............................................................................................................................................................................... 14
3.3 Disposing of packaging material.......................................................................................................................................................... 15
3.4 Setting up.............................................................................................................................................................................................. 15
3.5 Lid assembly (accessories).................................................................................................................................................................. 16
4. Putting into operation 17
4.1 Puttingintooperationforthersttime................................................................................................................................................ 17
4.2 Connect the appliance to the power supply ......................................................................................................................................... 17
4.3 Filling .................................................................................................................................................................................................... 17
4.4 Waterspecications ............................................................................................................................................................................. 18
4.5 Switching on appliance......................................................................................................................................................................... 18
5. Operation and control 19
5.1 Home screen ........................................................................................................................................................................................ 19
5.2 Setting the temperature and time......................................................................................................................................................... 19
5.3 Settings................................................................................................................................................................................................. 19
5.4 Outlet valve ........................................................................................................................................................................................... 22
5.5 Calibration............................................................................................................................................................................................. 22

4 03/2021
6. Malfunctions, warning and error messages 25
7. Maintenance and Servicing 26
7.1 Cleaning................................................................................................................................................................................................ 26
7.2 Regular maintenance............................................................................................................................................................................ 27
7.3 Repairs and service .............................................................................................................................................................................. 27
8. Storage and disposal 28
8.1 Storage.................................................................................................................................................................................................. 28
8.2 Disposal ................................................................................................................................................................................................ 28

5 03/2021
Safety
1. Safety
1.1 Terms and signs used
In this manual and on the appliance itself, certain common terms and signs are used to
warn you of possible dangers or to give you hints that are important in avoiding injury
or damage. Observe and follow these notes and regulations to avoid accidents and
damage. These terms and signs are explained below.
1.1.1 Terms used
WARNING
Warns of a dangerous situation that might lead to death or serious injuries.
CAUTION
Warns of a dangerous situation that might lead to moderate or minor injuries.
NOTICE
Warns of material damage
1.1.2 Signs used
Symbol Meaning Symbol Meaning
general warning sign Gases/vapours
Danger of electrocution Danger of explosion
Flammable substance warning Caution: hot steam
Caution: hot Disconnect the mains plug
Do not lift appliance Use gloves
Observe information in separate
manual

6 03/2021
Safety
1.2 Product safety and dangers
The appliances described in this manual are technically sophisticated, manufactured
using high-quality materials and subject to many hours of testing in the factory. They
reect the state of the art and comply with recognised technical safety regulations.
However, there are still risks involved, even when the appliances are used as intended.
These are described below.
Live components may be exposed once the covers have been removed. Touching
these can lead to an electric shock. Disconnect the mains plug before removing any
covers. Work on the electrical system must only be performed by qualied electri-
cians.
When loading the appliance with an unsuitable load, poisonous or explosive vapours
or gases may be produced. This could cause the appliance to explode, and persons
could be severely injured or poisoned. The appliance may only be loaded with mate-
rials / test objects that do not emit any poisonous or explosive vapours when heated
up.
Operating without a tempering medium can cause the appliance to overheat and pose
a re hazard. Do not operate the water bath without a tempering medium. Always
observe the minimum ll level for the tray.
Depending on operation, the surfaces of the appliance and the chamber load may still
be very hot after the appliance is switched off. Touching these surfaces can cause
burns. Wear heat-resistant protective gloves or wait until the appliance cools down
after switching off before touching.
The drain valve can become overheated while emptying the water bath. Touching its
surface can cause burns. Use heat-resistant protective gloves to turn the drain valve
on/off or let the tempering medium cool down rst and empty the water bath when it
has reached a lukewarm temperature.
CAUTION
Hot steam can build up inside the appliance. 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.
WARNING
WARNING
WARNING
WARNING
WARNING

7 03/2021
Safety
1.3 Requirements of the operating personnel
The appliance may only be operated and maintained by persons who are of legal age
and have been instructed accordingly. Personnel who are to be trained, instructed or
who are undergoing general training may only work with the appliance under the contin-
uous supervision of an experienced person. Repairs may only be performed by qualied
electricians. The regulations in the separate service manual must be observed.
1.4 Responsibility of the owner
The owner of the appliance
■is responsible for the awless condition of the appliance and for it being operated in
accordance with its intended use;
■is responsible for ensuring that persons who are to operate or service the appliance
are qualied to do this, have been instructed accordingly and are familiar with the op-
erating instructions at hand;
■must know about the applicable guidelines, requirements and operational safety regu-
lations, and train staff accordingly;
■is responsible for ensuring that unauthorised persons have no access to the appliance;
■is responsible for ensuring that the maintenance plan is adhered to and that mainte-
nance work is properly carried out;
■has to ensure that the appliance and its surroundings are kept clean and tidy, for exam-
ple through corresponding instructions and inspections;
■is responsible for ensuring that personal protective clothing is worn by operating per-
sonnel, e.g. work clothes, safety shoes and protective gloves.
1.5 Intended use
The Memmert waterbaths are intended for indirect tempering of samples or materials.
Water is meant to 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 asks 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 under their responsibility.
Any other use is improper and may result in hazards and damage. The appliance is not
explosion-proof (does not comply with the German occupational health and safety regu-
lation VBG 24). The appliance 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 appliance may 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 materi-
als, they must not be loaded into the appliance. Potentially explosive gas-air mixtures
must not form, neither in the working chamber nor in the direct vicinity of the appliance.
1.6 Changes and alterations
No unauthorised changes or alterations may be made to the appliance. No parts may be
added or inserted which have not been approved by the manufacturer.
Unauthorised changes or alterations result in the CE declaration of conformity losing its
validity, and the appliance may no longer be operated.
The manufacturer is not liable for any damage, danger or injuries that result from un-
authorised changes or alterations, or from non-compliance with the provisions in this
manual.

8 03/2021
Safety
1.7 Behaviour in case of malfunctions and irregularities
The appliance may only be used in a awless condition. If you, as the operator, notice
irregularities, malfunctions or damage, immediately turn off the appliance and inform
your superior. You can nd information on troubleshooting in the chapter 6.
1.8 Switching off the appliance in an emergency
Push the On/Off switch on the appliance and disconnect power plug. This disconnects
the appliance from the power supply at all poles.

9 03/2021
Construction and description
2. Construction and description
2.1 Design
Description Appliance overview
1. Stainless steel tray
2. Cooling ns
3. Touch display 3.5”
4. Outlet valve
1
2
34
Description Overview of rear
1. Mains plug
2. Main switch
3. Nameplate
4. Mounting option Lid
(accessory)
12
3
44
2.2 Description
2.2.1 Operation
The temperature control for the Memmert water baths is operated via a silicone
heating mat. A digital sensor measures the temperature at the water bath tray. The
water bath heating mat is resistant to damage through malfunctions or improper use.
Dry-run protection switches the water bath off if it is operating without a tempering
medium at about 180 °C. It also prevents the heating mat from overheating, for exam-
ple, if the water bath runs empty while unsupervised.

10 03/2021
Construction and description
2.3 Material
These appliances full the current requirements of the RoHS Directive. For more infor-
mation about this and about the Material Compliance of these Memmert GmbH+ Co.KG
appliances in general, please visit our homepage at www.memmert.com.
Components Material
Housing (lid + side panel) Stainless steel 1.4301 - ASTM 304
Interior (tray) Stainless steel 1.4301 - ASTM 304
Accessories (bottom grid, shaking device,
support basket, test tube racks, clamps) Stainless steel 1.4301 - ASTM 304
Outlet valve Stainless steel 1.4301 - ASTM 304
Screws and hinges Stainless steel 1.4301 - ASTM 304
Drain system Stainless steel 1.4301 - ASTM 304
Silicone hose Silicone - Shore A translucent
Heating mat Silicone
iThe chamber load for the appliance must be carefully checked for chemical compati-
bility with the materials mentioned.
2.4 Electrical equipment
■Operating voltage and current consumption: See name plate or technical data
■Protection class I, i.e. operating insulation with PE conductor in accordance with EN
61010
■Protection type IP 20 acc. to EN 60 529
■Interference suppression acc. to EN 55011 class B
■Appliance fuse: Safety fuse 250 V/15 A, quick-blow
■Electronic overtemperature monitor
■Heating thermal fuse: 240°C 250V/15A
2.5 Connections and interfaces
2.5.1 Electrical connection
This appliance is intended for operation on an electrical power system with a system
impedance Zmax at the point of transfer (service line) of a maximum of 0.292 Ohm. The
operator must ensure that the appliance is operated only on an electrical power sys-
tem that meets these requirements. If necessary, you can ask your local energy supply
company what the system impedance is. Observe the country-specic regulations when
making connections (e.g. in Germany DIN VDE 0100 with earth leakage circuit breaker).

11 03/2021
Construction and description
2.6 Designation (nameplate)
The nameplate provides information about the appliance model, manufacturer and tech-
nical data. It is attached to the back of the appliance, on the right near the mains plug.
Description Overview
1. Type designation
2. Operating voltage
3. Applied standard
4. Protection type
5. CE conformity
6. Address of manufacturer
7. Disposal note
8. Nominal temperature
9. Connection / power ratings
10. Serial number
GmbH+Co.KG D-91126 Schwabach FRG
Äußere Rittersbacher Str. 38 Made in Germany
memmert
Schutzart DIN EN 60529 - IP 20
1
2
3
4
5
6
10
9
8
7
Typ: WTB50
230 V~ 50/60 Hz
DIN12876-Kl.: 1
F-Nr.: LF21.0001
12,2 A 2800 W
Nenntemp.: 10-100°C

12 03/2021
Construction and description
2.7 Technical data
Model sizes 6 11 15 24 35 50
Stainless steel
interior Volume
ap-
prox.
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 150 200 150 200 150 200
Structured
stainless steel
housing
Width D mm 349 554 674
Height E1 mm 245 295 245 295 245 295
Height E2 mm 348 398 348 398 348 398
Depth F mm 289 349 554
Temperature Adjustment precision °C 0.1
Operating temperature range °C minimum 5 above ambient temperature to +100
Setting temperature range °C +10 to +100
electrical data Power 230 V; 50/60 Hz
W 1000 1420
2800
115 V; 50/60 Hz 2000
Current
consump-
tion
230 V; 50/60 Hz A 4.4 6.2 12.2
115 V; 50/60 Hz A 8.7 12.4 17.4
Packaging
data Net weight
ap-
prox.
kg
6 7 9 10 14 16
Gross weight (in cardboard box)
ap-
prox.
kg
10 12 14 16 20 23
Length mm 570 670 910
Width mm 450 530 610
Height mm 420 380 400 460 400 460

13 03/2021
Construction and description
2.8 Applied directives and standards
■Directive 2014/30/EU amended (Directive of the council for harmonisation of the laws
of the member states on electromagnetic compatibility)
Standards complied with: DIN EN 61326-1:2013-07 and EN 61326-1:2013
■Directive 2014/35/EC amended (Directive of the council on harmonisation of the laws
of
member states relating to electrical equipment designed for use within certain volt-
age limits). Standards complied with:
DIN EN 61010-1:2011-07 EN 61010-1:2010
DIN EN 61010-2-010:2015-05 and EN 61010-2-010:2014
2.8.1 Declaration of conformity
You can download the EC declaration of conformity of the appliance online under:
www.memmert.com/de/downloads/downloads/eu-konformitaetserklaerung
2.9 Ambient conditions
Ambient temperature +5 °C to 40 °C
Air humidity max. 80 % rh (non-condensing)
Overvoltage category II
Pollution degree 2
Altitude of installation max. 2,000 m above sea level
■The appliance may only be used in enclosed areas and under the ambient conditions
listed below
■The appliance may not be used in areas where there is a risk of explosion. The ambi-
ent air must not contain any explosive dusts, gases, vapours or gas-air mixtures. The
appliance is not explosion-proof.
■Heavy dust production or aggressive vapours in the vicinity of the appliance could lead
to sedimentation in the interior and, as a consequence, could result in short circuits or
damage to electrical parts. For this reason, sufcient measures to prevent large clouds
of dust or aggressive vapours from developing should be taken.
2.10 Scope of delivery
Standard
■Waterbath
■Network connection
■Quick guide
Optional
■Gable/at lid
■Floor grid
■Clamps, insert racks and test tube racks
■Peltier cooling unit
■Shaking Device
■Pumping device
■Factory calibration certicate
■IQ/OQ document with works test data for appliances

14 03/2021
Delivery, Transport and Setting Up
3. Delivery, Transport and Setting Up
3.1 Safety
Condensation in the electrical components may cause short circuits. After transport-
ing or storing the appliance under humid conditions, remove it from its packaging and
let it ventilate for at least 24 hours in normal ambient conditions. Do not connect the
appliance to the mains power during this time.
Because of the heavy weight of the appliance, you could injure yourself if you try to
lift it. Observe the required number of people to carry equipment.
< 50 L 50 L
The appliance could fall over and injure you. If a lid is mounted, do not transport the
appliance while it is open. Never tilt the appliance and only transport it empty and in
upright position.
You may get your hands or feet squashed when transporting and installing the ap-
pliance. Wear protective gloves and safety boots. Only grasp the appliance below on
the sides between the mounted adjustable feet.
3.2 Delivery/unpacking
■The appliance is packed in a cardboard box
■To avoid damage, do not unpack the appliance until you reach the installation site.
■Remove the cardboard packaging by pulling it upwards or carefully cutting along an
edge
WARNING
CAUTION
CAUTION
CAUTION

15 03/2021
Delivery, Transport and Setting Up
3.2.1 Product control
■Check the delivery note to ensure that the scope of delivery is complete
■Check the appliance for damage
If you notice deviations from the scope of delivery, damage or irregularities, do not put
the appliance into operation but inform the haulage company and the manufacturer.
3.3 Disposing of packaging material
■Dispose of the packaging material (cardboard, wood, foil) in accordance with the appli-
cable disposal regulations for the respective material in your country
3.4 Setting up
If the appliance is set up on an uneven surface, it can fall over and injure you or other
people. Always place the appliance on an even, load-bearing and non-slip surface.
The surfaces of the appliance can overheat during operation and overheat heat-sen-
sitive surfaces in close proximity to the appliance. Always place the appliance on a
heat-resistant surface and maintain the specied clearance around the appliance.
The distance between the wall and the rear of the appliance must be at least 15 cm. The
clearance from the ceiling must not be less than 75 cm and the side clearance from
walls or nearby appliances must not be less than 10 cm. Sufcient air circulation in the
vicinity of the appliance must be guaranteed at all times.
CAUTION
CAUTION
memmert
10 cm 10 cm 15 cm 10 cm
75 cm

16 03/2021
Delivery, Transport and Setting Up
3.5 Lid assembly (accessories)
1. Loosen the screws on the xing points (left and right) for the lid on the water bath.
2. Remove screws and set aside.
3. Attach the mounting bracket to the lid and x in place with the screws.
4. Tighten screws and check that the lid ts tightly.

17 03/2021
Putting into operation
4. Putting into operation
4.1 Putting into operation for the rst time
NOTICE
When putting the appliance into operation for the rst time, do not leave it unattended
until it has reached a steady state.
For connection, please observe the national regulations. Observe the connection and
power ratings (see name plate and technical data). Make sure to establish a safe PE
conductor connection.
4.2 Connect the appliance to the power supply
Place the power cable so that
■it does not represent a trip hazard
■it cannot come into contact with any hot parts
■it is easily accessible at all times and can be pulled off quickly, for example in case of
interference or an emergency
4.3 Filling
NOTICE
Observe the following points before lling the water bath:
■Water bath may not be operated while empty
■Check that the outlet valve is closed before lling
■Observe the minimum ll level for the water bath
■Observe the maximum lling level when lling and loading the water bath, which is
marked by the edge in the water bath tray
Large WTB Filling level
6min. 4 cm
11
15
min. 2 cm
24
35
50
memmert
MIN
MAX

18 03/2021
Putting into operation
4.4 Water specications
NOTICE
Only demineralised water with the following specications may be used in Memmert appliances:
■Conductivity of 5 – 10 μS/cm
■pH value between 5 and 7
The tray may suffer damage if ultrapure water or DI water with an electrical conduct-
ance level of below 5 microsiemens is used.
4.5 Switching on appliance
Press main switch on the back of the appliance.

19 03/2021
Operation and control
5. Operation and control
5.1 Home screen
CustomView will appear rst after switching the appliance on (5.3.3)
To access the home screen, touch any spot on the TouchDisplay
►Select the set display
Set
to adjust the set temperature
►Select the symbol to set the timer
►Select the symbol to set the alarm temperature
►Touch the symbol for other appliance settings.
5.2 Setting the temperature and time
1
21
19
0
°C
20 .
Set the individual values by scrolling vertically on the
touch display:
►Enter the temperature for the set value in °C/ °F
►Enter the alarm temperature in °C/ °F
►Set time for the timer in minutes/hours
Press to conrm entry. The setting is not saved with
5.3 Settings
CAL°C/°F
Info CustomView
Other settings are possible under the Settings menu item :
►Set the desired temperature unit as °C or °F
►Set 2-point calibration
►Appliance information overview
►CustomView setting
Press to return to the home screen
00:00h 000.0°C
Set 10.0°C
22.0°C

20 03/2021
Operation and control
5.3.1 Temperature display unit
Set the temperature unit in the sub-menu on
°C / °F
Set the values by scrolling vertically on the
touch display:
5.3.2 Calibration settings
Make 2-point calibration in the sub-menu on
CAL
►The left side shows the compensation temperature setting
(CAL1 temp / CAL2 temp)
►The right side shows the compensation correction values
(DEV1 / DEV2)
Equipment calibration see chapter 5.5
Press to return to appliance settings
The compensation temperature and compensation correction values are adjusted the
same way as the temperature setting, see chapter 5.2
°C
°F
Temperature
CAL 1 Temp DEV 1 +/-
DEV 2 +/-CAL 2 Temp
00.0°C 0.0K
0.0K 00.0°C
1
99
0
°C
100 .
CAL 1