IEC 61010-2-051:2015

IEC 61010-2-051 ®
Edition 3.0 2015-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Safety requirements for electrical equipment for measurement, control, and
laboratory use –
Part 2-051: Particular requirements for laboratory equipment for mixing and
stirring
Règles de sécurité pour appareils électriques de mesurage, de régulation et de
laboratoire –
Partie 2-051: Exigences particulières pour appareils de laboratoire utilisés pour
mixer et agiter
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IEC 61010-2-051 ®
Edition 3.0 2015-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ

Safety requirements for electrical equipment for measurement, control, and

laboratory use –
Part 2-051: Particular requirements for laboratory equipment for mixing and

stirring
Règles de sécurité pour appareils électriques de mesurage, de régulation et de

laboratoire –
Partie 2-051: Exigences particulières pour appareils de laboratoire utilisés pour

mixer et agiter
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.080, 71.040.20 ISBN 978-2-8322-2297-3

– 2 – IEC 61010-2-051:2015 © IEC 2015

CONTENTS
FOREWORD . 3

1 Scope and object . 5

2 Normative references . 5

3 Terms and definitions . 5

4 Tests . 5

5 Marking and documentation . 5

6 Protection against electric shock . 6
7 Protection against mechanical HAZARDS . 6
8 Resistance to mechanical stresses . 7
9 Protection against the spread of fire . 8
10 Equipment temperature limits and resistance to heat . 8
11 Protection against HAZARDS from fluids . 8
12 Protection against radiation, including laser sources, and against sonic and
ultrasonic pressure . 8
13 Protection against liberated gases and substances, explosion and implosion . 8
14 Components and subassemblies . 8
15 Protection by interlocks . 8
16 HAZARDS resulting from application . 9
17 RISK Assessment . 9
Annexes . 10
Bibliography . 10

INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
SAFETY REQUIREMENTS FOR ELECTRICAL EQUIPMENT

FOR MEASUREMENT, CONTROL, AND LABORATORY USE –

Part 2-051: Particular requirements for laboratory

equipment for mixing and stirring

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61010-2-051 has been prepared by IEC technical committee 66:
Safety of measuring, control and laboratory equipment.
It has the status of a group safety publication in accordance with IEC Guide 104.
This third edition cancels and replaces the second edition published in 2003. It constitutes a
technical revision and includes the following change from the second edition:
• exclusion of equipment, whose size and weight make unintentional movement unlikely,
from the drop test in Clause 8,
• added requirement for interlock systems containing electric/electronic or programmable
components to Clause 15,
• notes have been re-phrased according to ISO/IEC Directives.

– 4 – IEC 61010-2-051:2015 © IEC 2015

The text of this standard is based on the following documents:

FDIS Report on voting
66/552/FDIS 66/567/RVD
Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts of the IEC 61010 series, under the general title: Safety requirements for
electrical equipment for measurement, control, and laboratory use, may be found on the IEC
website.
This Part 2-051 is intended to be used in conjunction with IEC 61010-1. It was established
on the basis of the third edition (2010). This Part 2-051 supplements or modifies the
corresponding clauses in IEC 61010-1 so as to convert that publication into the IEC standard:
Safety requirements for laboratory equipment for mixing and stirring.
Where a particular subclause of Part 1 is not mentioned in this part 2, that subclause applies
as far as is reasonable. Where the part states “addition”, “modification”, “replacement” or
“deletion”, the relevant requirement, test specification, or note in Part 1 should be adapted
accordingly.
In this standard:
1) the following print types are used:
– requirements: in roman type;
– NOTES: in small roman type;
– conformity and test: in italic type;
– terms used throughout this standard which have been defined in clause 3: SMALL ROMAN
CAPITALS;
2) subclauses, figures, tables and notes which are additional to those in Part 1 are numbered
starting from 101. Additional annexes are lettered starting from AA.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be

• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
SAFETY REQUIREMENTS FOR ELECTRICAL EQUIPMENT

FOR MEASUREMENT, CONTROL, AND LABORATORY USE –

Part 2-051: Particular requirements for laboratory

equipment for mixing and stirring

1 Scope and object
This clause of Part 1 is applicable except as follows:
1.1 Scope
Replacement:
Replace the text in 1,1 by the following paragraph:
This part of IEC 61010 is applicable to electrically operated laboratory equipment and its
accessories for mechanical mixing and stirring, where mechanical energy influences the
shape or size or homogeneity of materials and their accessories. Such devices may contain
heating elements.
NOTE If all or part of the equipment falls within the scope of one or more other Part 2 standards of IEC 61010 as
well as within the scope of this standard, consideration is to be given to those other Part 2 standards. The standard
for equipment which contain heating devices is IEC 61010-2-010.
2 Normative references
This clause of Part 1 is applicable except as follows:
Addition:
Add the following references to the list:
IEC 62061, Safety of machinery – Functional safety of safety-related electrical, electronic and
programmable electronic control systems
ISO 13849, Safety of machinery – Safety-related parts of control systems

3 Terms and definitions
This clause of Part 1 is applicable.
4 Tests
This clause of Part 1 is applicable.
5 Marking and documentation
This clause of Part 1 is applicable except as follows:

– 6 – IEC 61010-2-051:2015 © IEC 2015

5.4.1 General
Addition:
Add, after item h), the following new item:

aa) if a HAZARD could be caused by operating a mixer or stirrer intended for use as HAND-
HELD EQUIPMENT, there shall be a warning statement to that effect.

5.4.4 Equipment operation
Additions:
Add after item j), the following new item:
aa) instructions for fixing the stirring vessel if specified and sold as part of a mixing system,
or if otherwise applicable.
Add a new paragraph after the list of items as follows:
The instructions shall warn against use of the equipment in hazardous atmospheres or with
hazardous materials for which the equipment is not designed.
Replacement:
Replace the paragraph before the compliance statement by the following:
The user shall be made aware that the protection provided by the equipment may be impaired
if the equipment is used with accessories not provided or recommended by the manufacturer,
or used in a manner not specified by the manufacturer.
6 Protection against electric shock
This clause of Part 1 is applicable.
7 Protection against mechanical HAZARDS
This clause of Part 1 is applicable except as follows:
7.3.2 Exceptions
Replacement:
Replace, in item a), the words "for example drilling and mixing equipment” by the following:
for example stirrer shafts and impellers extending downwards into material being stirred.
Addition:
Add the following subclauses:
7.3.101 Speed controls
If a SINGLE FAULT of an electronic speed control could cause a HAZARD, the equipment shall
incorporate means to interrupt power or otherwise prevent the HAZARD.

Conformity is checked by inspection and test.

7.3.102 Movement during operation

Equipment shall not change position during NORMAL USE.

Conformity is checked by inspection and test. Equipment which has not moved by more

than 5 mm after operation for 10 min is considered to meet the requirement.

7.3.103 Restarting after interruption

Depending on the operation, a HAZARD may be caused either by re-starting or by not re-
starting after interruption of the mixing action. Instructions shall specify whether equipment
will re-start or not re-start, both in the case of MAINS interruption and in the case of a fault or
mechanical interruption. If after interruption a hazard can occur the equipment shall be
equipped with an audible or visible signal to warn that an interruption has occurred.
Conformity is checked by inspection of documentation.
7.3.104 HAZARDS related to application
Additional HAZARDS may occur with equipment used to mix flammable materials, or where the
transfer of mechanical energy to glass apparatus could lead to breakage.
Instructions for use shall warn against the use of equipment in such applications unless the
equipment incorporates appropriate safety devices to prevent a HAZARD in SINGLE FAULT
. Such safety devices shall be independent from control systems.
CONDITION
Examples of HAZARDS and appropriate safety devices include the following.
a) Where failure of the mixing action could cause a HAZARD, for example in metal-organic
reactions, the safety device shall initiate an alarm signal:
1) if the drive shaft or mixer fails to turn when the mixer is switched on; or
2) when an overload causes the shaft speed to fall below a preset level.
NOTE Speed reduction can be caused by a lack of power or by the operation of an automatic device which
reduces the shaft speed in the case of an overload.
b) Where a hazard could be caused by excessive torque applied to high-viscosity material,
for example through glass breakage, the safety device shall initiate an alarm signal if the
torque rises above a preset level. It is recommended that safety devices work according to
the principle of rest-current.

Conformity is checked by inspection and test.
8 Resistance to mechanical stresses
This clause of Part 1 is applicable except as follows:
8.1 General
Replacement:
Replace the text of item 3) by the following:
3) except for FIXED EQUIPMENT, for equipment with a mass over 100 kg, or for equipment
whose size and weight make unintentional movement unlikely and which is not moved in
NORMAL USE, the appropriate test of 8.3. The equipment is not operated during the tests.

– 8 – IEC 61010-2-051:2015 © IEC 2015

9 Protection against the spread of fire

This clause of Part 1 is applicable.

10 Equipment temperature limits and resistance to heat

This clause of Part 1 is applicable.

11 Protection against HAZARDS from fluids

This clause of Part 1
...