Metrohm 728 User manual

728 Magnetic Stirrer
Manual
8.728.8001EN / 2019-11-29

Metrohm AG
CH-9100 Herisau
Switzerland
Phone [phone]
Fax [phone]
[email protected]
www.metrohm.com
728 Magnetic Stirrer
Manual
8.728.8001EN / 2019-11-29

Technical Communication
Metrohm AG
CH-9100 Herisau
[email protected]
This documentation is protected by copyright. All rights reserved.
This documentation has been prepared with great care. However, errors
can never be entirely ruled out. Please send comments regarding possible
errors to the address above.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ Table of contents
728 Magnetic Stirrer ￭￭￭￭￭￭￭￭ III
Table of contents
1 Introduction 1
1.1 Instrument description ......................................................... 1
1.1.1 Model versions ........................................................................ 1
1.1.2 Connectors .............................................................................. 1
1.1.3 Intended use ........................................................................... 1
1.2 About the documentation ................................................... 2
1.2.1 Symbols and conventions ........................................................ 2
1.3 Safety instructions ................................................................ 3
1.3.1 General notes on safety ........................................................... 3
1.3.2 Electrical safety ........................................................................ 3
1.3.3 Tubing and capillary connections ............................................. 4
1.3.4 Flammable solvents and chemicals ........................................... 4
1.3.5 Recycling and disposal ............................................................. 4
2 Overview of the instrument 6
3 Installation 8
3.1 Setting up the instrument .................................................... 8
3.1.1 Packaging ................................................................................ 8
3.1.2 Checks .................................................................................... 8
3.1.3 Location .................................................................................. 8
3.2 Installing the magnetic stirrer ............................................. 8
3.3 Connecting the magnetic stirrer .......................................... 8
4 Operation and maintenance 9
4.1 General notes ........................................................................ 9
4.1.1 Care ........................................................................................ 9
4.1.2 Maintenance by Metrohm Service ............................................ 9
5 Technical specifications 10
5.1 Magnetic stirrer .................................................................. 10
5.2 Power supply ...................................................................... 10
5.3 Interfaces and connectors ................................................. 10
5.4 Ambient temperature ......................................................... 10
5.5 Reference conditions .......................................................... 10
5.6 Dimensions/material ........................................................... 11
6 Accessories 12
Index 13

Table of figures ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
IV ￭￭￭￭￭￭￭￭ 728 Magnetic Stirrer
Table of figures
Figure 1 Front ................................................................................................. 6
Figure 2 Rear with stand ................................................................................. 7

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 1 Introduction
728 Magnetic Stirrer ￭￭￭￭￭￭￭￭ 1
1 Introduction
1.1 Instrument description
The 728 Magnetic Stirrer with base plate, support rod and electrode
holder supplements Titrino and Dosino units.
1.1.1 Model versions
The 728 Magnetic Stirrer is available in the following six versions:
2.728.0010 728 Magnetic Stirrer
2.728.0021 728 Magnetic Stirrer With 115 V US power
supply unit
2.728.0024 728 Magnetic Stirrer With 230 V EURO power
supply unit
2.728.0031 728 Magnetic Stirrer With 115 V US power
supply unit and stand
2.728.0034 728 Magnetic Stirrer With 230 V EURO power
supply unit and stand
2.728.0040 728 Magnetic Stirrer Complete for Titrino/
Dosino
Each version includes different accessories according to its use (see chap-
ter 6, page 12).
1.1.2 Connectors
The 728 Magnetic Stirrer needs 5 to 12 V DC voltage.
The 728 Magnetic Stirrer is supplied with power via a direct connection to
a Titrino, Dosino or via a power supply unit.
1.1.3 Intended use
The 728 Magnetic Stirrer is designed for usage in analytical laboratories.
This instrument is suitable for stirring chemicals and flammable samples.
Usage of the 728 Magnetic Stirrer therefore requires the user to have
basic knowledge and experience in handling toxic and caustic substances.
Knowledge with respect to the application of the fire prevention measures
prescribed for laboratories is also mandatory.

1.2 About the documentation ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
2￭￭￭￭￭￭￭￭ 728 Magnetic Stirrer
1.2 About the documentation
CAUTION
Please read through this documentation carefully before putting the
instrument into operation. The documentation contains information
and warnings which the user must follow in order to ensure safe opera-
tion of the instrument.
1.2.1 Symbols and conventions
The following symbols and formatting may appear in this documentation:
Cross-reference to figure legend
The first number refers to the figure number, the sec-
ond to the instrument part in the figure.
Instruction step
Carry out these steps in the sequence shown.
Method Dialog text, parameter in the software
File ▶ New Menu or menu item
[Next] Button or key
WARNING
This symbol draws attention to a possible life-threat-
ening hazard or risk of injury.
WARNING
This symbol draws attention to a possible hazard due
to electrical current.
WARNING
This symbol draws attention to a possible hazard due
to heat or hot instrument parts.
WARNING
This symbol draws attention to a possible biological
hazard.
CAUTION
This symbol draws attention to possible damage to
instruments or instrument parts.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 1 Introduction
728 Magnetic Stirrer ￭￭￭￭￭￭￭￭ 3
NOTE
This symbol highlights additional information and
tips.
1.3 Safety instructions
1.3.1 General notes on safety
WARNING
Operate this instrument only according to the information contained in
this documentation.
This instrument left the factory in a flawless state in terms of technical
safety. To maintain this state and ensure non-hazardous operation of the
instrument, the following instructions must be observed carefully.
1.3.2 Electrical safety
The electrical safety when working with the instrument is ensured as part
of the international standard IEC 61010.
WARNING
Only personnel qualified by Metrohm are authorized to carry out service
work on electronic components.
WARNING
Never open the housing of the instrument. The instrument could be
damaged by this. There is also a risk of serious injury if live components
are touched.
There are no parts inside the housing which can be serviced or replaced
by the user.
Supply voltage
WARNING
An incorrect supply voltage can damage the instrument.
Only operate this instrument with a supply voltage specified for it (see
rear panel of the instrument).

1.3 Safety instructions ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
4￭￭￭￭￭￭￭￭ 728 Magnetic Stirrer
Protection against electrostatic charges
WARNING
Electronic components are sensitive to electrostatic charges and can be
destroyed by discharges.
Do not fail to pull the power cord out of the power socket before you
set up or disconnect electrical plug connections at the rear of the
instrument.
1.3.3 Tubing and capillary connections
CAUTION
Leaks in tubing and capillary connections are a safety risk. Tighten all
connections well by hand. Avoid applying excessive force to tubing con-
nections. Damaged tubing ends lead to leakage. Appropriate tools can
be used to loosen connections.
Check the connections regularly for leakage. If the instrument is used
mainly in unattended operation, then weekly inspections are manda-
tory.
1.3.4 Flammable solvents and chemicals
WARNING
All relevant safety measures are to be observed when working with
flammable solvents and chemicals.
￭Set up the instrument in a well-ventilated location (e.g. fume cup-
board).
￭Keep all sources of flame far from the workplace.
￭Clean up spilled liquids and solids immediately.
￭Follow the safety instructions of the chemical manufacturer.
1.3.5 Recycling and disposal
This product is covered by European Directive 2012/19/EU, WEEE – Waste
Electrical and Electronic Equipment.
The correct disposal of your old instrument will help to prevent negative
effects on the environment and public health.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 1 Introduction
728 Magnetic Stirrer ￭￭￭￭￭￭￭￭ 5
More details about the disposal of your old instrument can be obtained
from your local authorities, from waste disposal companies or from your
local dealer.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
6￭￭￭￭￭￭￭￭ 728 Magnetic Stirrer
2 Overview of the instrument
1
2
3
4
Figure 1 Front
1Sample space 2On/off signal light
3On/off switch 4Shift rate controller

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 2 Overview of the instrument
728 Magnetic Stirrer ￭￭￭￭￭￭￭￭ 7
1 2 3 4
Figure 2 Rear with stand
1Connector plug 2Stand clamping screw
3Stand 4Cable cut-out

3.1 Setting up the instrument ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
8￭￭￭￭￭￭￭￭ 728 Magnetic Stirrer
3 Installation
3.1 Setting up the instrument
3.1.1 Packaging
The instrument is supplied in protective packaging together with the sepa-
rately packed accessories. Keep this packaging, as only this ensures safe
transportation of the instrument.
3.1.2 Checks
Immediately after receipt, check whether the shipment has arrived com-
plete and without damage by comparing it with the delivery note.
3.1.3 Location
The instrument has been developed for operation indoors and may not be
used in explosive environments.
Place the instrument in a location of the laboratory which is suitable for
operation and free of vibrations and which provides protection against
corrosive atmosphere and contamination by chemicals.
The instrument should be protected against excessive temperature fluctua-
tions and direct sunlight.
3.2 Installing the magnetic stirrer
The 728 Magnetic Stirrer is fastened to a support rod with a diameter of
10 mm.
3.3 Connecting the magnetic stirrer
Power supply
The 728 Magnetic Stirrer needs 5 to 12 V DC voltage.
It can be operated directly at a Metrohm instrument with a stirrer connec-
tor.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 4 Operation and maintenance
728 Magnetic Stirrer ￭￭￭￭￭￭￭￭ 9
4 Operation and maintenance
4.1 General notes
4.1.1 Care
The 728 Magnetic Stirrer requires appropriate care. Excess contamination
of the instrument may result in functional disruptions and a reduction in
the lifetime of the otherwise sturdy mechanics and electronics.
Spilled chemicals and solvents should be removed immediately. Above all,
the plug connections on the rear of the instrument (in particular the con-
nection socket) should be protected from contamination.
CAUTION
Although this is extensively prevented by design measures, the connec-
tion cable should be unplugged immediately if aggressive media have
found their way into the interior of the instrument to prevent serious
damage to the instrument electronics. In such cases, Metrohm Service
must be informed.
4.1.2 Maintenance by Metrohm Service
Maintenance of the 728 Magnetic Stirrer is best carried out as part of
annual service, which is performed by specialist personnel from Metrohm.
If working frequently with caustic and corrosive chemicals, a shorter main-
tenance interval could be necessary.
Metrohm Service offers every form of technical advice for maintenance
and service of all Metrohm instruments.

5.1 Magnetic stirrer ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
10 ￭￭￭￭￭￭￭￭ 728 Magnetic Stirrer
5 Technical specifications
5.1 Magnetic stirrer
Direction of rota-
tion
Counterclockwise
Rotational speed 200 - 1,900 rpm
5.2 Power supply
Power supply 5 - 12 V DC
Power consump-
tion
≤ 2.5 VA
5.3 Interfaces and connectors
The 728 Magnetic Stirrer does not have any control interfaces. It is oper-
ated and controlled via the power supply.
5.4 Ambient temperature
Nominal function
range
+5 - +45 °C
Transport and
storage
–40 - +70 °C
5.5 Reference conditions
Ambient tempera-
ture
+25 °C (± 3 °C)
Relative humidity ≤ 60%

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 5 Technical specifications
728 Magnetic Stirrer ￭￭￭￭￭￭￭￭ 11
5.6 Dimensions/material
Width 90 mm
Height 76 mm
Depth 150 mm
Weight 660 g (without accessories)
Material
Housing, upper
part
PBT
Housing, bot-
tom part
Steel sheet, stove-enameled

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
12 ￭￭￭￭￭￭￭￭ 728 Magnetic Stirrer
6 Accessories
Up-to-date information on the scope of delivery and optional accessories
for your product can be found on the Internet. You can download this
information using the article number as follows:
Downloading the accessories list
1Enter https://www.metrohm.com/ into your Internet browser.
2Enter the article number (e.g. 728) into the search field.
The search result is displayed.
3Click on the product.
Detailed information regarding the product is shown on various tabs.
4On the Included parts tab, click on Download the PDF.
The PDF file with the accessories data is created.
NOTICE
Once you have received your new product, we recommend download-
ing the accessories list from the Internet, printing it out and keeping it
together with the manual for reference purposes.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ Index
728 Magnetic Stirrer ￭￭￭￭￭￭￭￭ 13
Index
C
Connect
Magnetic stirrer .................... 8
D
Dimensions .............................. 11
E
Electrostatic charge .................... 4
I
Instrument description ................ 1
M
Magnetic stirrer
Direction of rotation ........... 10
Rotational speed ................. 10
Material .................................... 11
Model versions ........................... 1
P
Power supply
Power consumption ............ 10
Supply voltage .................... 10
S
Safety instructions ...................... 3
Service ....................................... 3
Supply voltage ............................ 3