EN 1760-3:2004

Safety of machinery - Pressure sensitive protective devices - Part 3: General principles for the design and testing of pressure sensitive bumpers, plates, wires and similar devices

This European Standard deals with requirements for pressure sensitive protective devices which are not specified in EN 1760-1 and EN 1760-2. The majority of  these devices are produced for specific applications and are not available as off-the-shelf items.
The purpose of this European Standard relates primarily to safety and reliability rather than suitability. For the relationship between safety and reliability, see EN 954-1: 1996, annex D.
This European Standard specifies requirements for pressure sensitive protective devices with and without an external reset facility.
This European Standard does not specify the dimensions of  pressure sensitive protective devices in relation to any particular application. Specific requirements for particular applications may be set out in relevant type C standards.
The European Standard does not cover stopping devices used only for the regular operation, including emergency stopping, of machinery. It also does not apply to use in locations accessible to elderly or disabled persons or children, where special additional requirements may be necessary.
Basic requirements are given for pressure sensitive protective devices not covered in EN 1760-1 and EN 1760-2.
Specific requirements are given for the following devices:
¾ pressure sensitive bumpers;
¾ pressure sensitive plates;
¾ pressure sensitive wires (trip wires).
NOTE   Some requirements are made with respect to electromagnetic compatibility (EMC). These are intended to meet the requirements of the Council Directive 98/37/EC ("Machinery Directive") [1] only and not those of Council Directive 89/336/EC ("EMC Directive") [2].

Sicherheit von Maschinen - Druckempfindliche Schutzeinrichtungen - Teil 3: Allgemeine Leitsätze für die Gestaltung und Prüfung von Schaltpuffern, Schaltflächen, Schaltleinen und ähnlichen Einrichtungen

Diese Europäische Norm behandelt Anforderungen für druckempfindliche Schutzeinrichtungen, die nicht in EN 1760-1 und EN 1760-2 festgelegt sind. Die Mehrzahl dieser Einrichtungen wird für bestimmte Anwendungen hergestellt und ist nicht als übliche Handelsware erhältlich.
Diese Europäische Norm hat in erster Linie die Sicherheit und Zuverlässigkeit, und nicht die Eignung, zum Ziel. Für die Beziehung zwischen Sicherheit und Zuverlässigkeit, siehe EN 954-1:1996, Anhang D.
Diese Europäische Norm legt Anforderungen für druckempfindliche Schutzeinrichtungen mit und ohne Rückstelleinrichtung fest.
Diese Europäische Norm legt nicht die Abmessungen von druckempfindlichen Schutzeinrichtungen in Bezug auf eine bestimmte Anwendung fest. Spezielle Anforderungen für besondere Anwendungen können in den entsprechenden Typ C-Normen enthalten sein.
Diese Europäische Norm behandelt nicht Stopeinrichtungen, die nur für den Normalbetrieb von Maschinen, einschließlich Not-Aus, verwendet werden. Sie gilt ebenfalls nicht für die Anwendung an Orten, die für alte oder behinderte Menschen oder Kinder zugänglich sind und an denen zusätzliche Anforderungen erforderlich sein können.
Es werden grundlegende Anforderungen für druckempfindliche Schutzeinrichtungen gegeben, die in EN 1760-1 und EN 1760-2 nicht behandelt werden. Spezielle Anforderungen sind für folgende Einrichtungen angegeben:
¾ Schaltpuffer,
¾ Schaltflächen und
¾ Schaltleinen
ANMERKUNG   Einige Anforderungen wurden in Bezug auf elektromagnetische Verträglichkeit (EMV) gemacht. Diese sollen nur die Anforderungen der Richtlinie 98/37/EG des Europäischen Parlaments und des Rates ("Maschinenrichtlinie") [1] und nicht die Anforderungen der Richtlinie 89/336/EG des Rates ("EMV-Richtlinie")[2] erfüllen.

Sécurité des machines - Dispositifs de protection sensibles à la pression - Partie 3 : Principes généraux de conception et d'essai des pare-chocs, plaques, câbles et dispositifs analogues sensibles à la pression

La présente Norme européenne traite des prescriptions relatives aux dispositifs de protection sensibles à la pression non spécifiés dans l'EN 1760-1 et l'EN 1760-2. La majorité de ces dispositifs est fabriquée pour des applications spécifiques et n'est pas disponible sur catalogue.
L'objet de la présente Norme européenne porte en premier lieu sur la sécurité et la fiabilité plutôt que sur l'aptitude à l'usage. Pour la relation entre sécurité et fiabilité, voir l'EN 954-1:1996, Annexe D.
La présente Norme européenne spécifie les prescriptions relatives aux dispositifs de protection sensibles à la pression avec ou sans moyens de réarmement externes.
La présente Norme européenne ne spécifie pas les dimensions des dispositifs de protection sensibles à la pression pour applications spécifiques. Des prescriptions spéciales pour des applications particulières peuvent être définies dans les normes de type C correspondantes.
La présente Norme européenne ne couvre pas les dispositifs d'arrêt utilisés exclusivement pour le fonctionnement normal des machines, y compris l'arrêt d'urgence. Elle ne s'applique pas non plus aux utilisations dans des lieux accessibles aux personnes âgées, aux personnes handicapées ou aux enfants, où des prescriptions particulières supplémentaires peuvent être nécessaires.
Des prescriptions de base sont données pour les dispositifs de protection sensibles à la pression qui ne sont pas couverts par l'EN 1760-1 et l'EN 1760-2.
Des prescriptions particulières sont données pour les dispositifs suivants :
¾ pare-chocs sensibles à la pression ;
¾ plaques sensibles à la pression ;
¾ câbles sensibles à la pression (câbles de détection de passage).
NOTE   Certaines prescriptions portent sur la compatibilité électromagnétique (CEM). Elles visent à satisfaire les prescriptions de la Directive du conseil 98/37/CE ("Directive Machines") [1] uniquement et non celles de la Directive du conseil 89/336/CE ("Directive CEM") [2].

Varnost strojev - Tlačno občutljive zaščitne naprave - 3. del: Splošna načela za načrtovanje in preskušanje tlačno občutljivih odbojnikov, plošč, žic in podobnih naprav

General Information

• Status: Withdrawn
• Publication Date: 10-Aug-2004
• Withdrawal Date: 24-Mar-2009
• ICS: 13.110 - Safety of machinery
• Technical Committee: CEN/TC 114 - Safety of machinery
• Drafting Committee: CEN/TC 114/WG 8 - Pressure-sensitive mats and similar devices
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 25-Mar-2009
• Completion Date: 25-Mar-2009
• Directive: 98/37/EC - Machinery
• Mandate: M/BC/CEN/88/13 - Standardization request to CEN/CENELEC relating to machinery
• Ref Project: SIST EN 1760-3:2004 - Safety of machinery - Pressure sensitive protective devices - Part 3: General principles for the design and testing of pressure sensitive bumpers, plates, wires and similar devices

Relations

• Merged Into: EN 1760-3:2004+A1:2009 - Safety of machinery - Pressure sensitive protective devices - Part 3: General principles for the design and testing of pressure sensitive bumpers, plates, wires and similar devices
• Effective Date: 19-Jan-2023
• Corrected By: EN 1760-3:2004/AC:2006 - Safety of machinery - Pressure sensitive protective devices - Part 3: General principles for the design and testing of pressure sensitive bumpers, plates, wires and similar devices
• Effective Date: 22-Dec-2008

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 1760-3:2004
01-november-2004
9DUQRVWVWURMHY7ODþQRREþXWOMLYH]DãþLWQHQDSUDYHGHO6SORãQDQDþHOD]D
QDþUWRYDQMHLQSUHVNXãDQMHWODþQRREþXWOMLYLKRGERMQLNRYSORãþåLFLQSRGREQLK
QDSUDY
Safety of machinery - Pressure sensitive protective devices - Part 3: General principles
for the design and testing of pressure sensitive bumpers, plates, wires and similar
devices
Sicherheit von Maschinen - Druckempfindliche Schutzeinrichtungen - Teil 3: Allgemeine
Leitsätze für die Gestaltung und Prüfung von Schaltpuffern, Schaltflächen, Schaltleinen
und ähnlichen Einrichtungen
Sécurité des machines - Dispositifs de protection sensibles a la pression - Partie 3 :
Principes généraux de conception et d'essai des pare-chocs, plaques, câbles et
dispositifs analogues sensibles a la pression
Ta slovenski standard je istoveten z: EN 1760-3:2004
ICS:
13.110 Varnost strojev Safety of machinery
SIST EN 1760-3:2004 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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EUROPEAN STANDARD
EN 1760-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2004
ICS 13.110
English version
Safety of machinery - Pressure sensitive protective devices -
Part 3: General principles for the design and testing of pressure
sensitive bumpers, plates, wires and similar devices
Sécurité des machines - Dispositifs de protection sensibles Sicherheit von Maschinen - Druckempfindliche
à la pression - Partie 3 : Principes généraux de conception Schutzeinrichtungen - Teil 3: Allgemeine Leitsätze für die
et d'essai des pare-chocs, plaques, câbles et dispositifs Gestaltung und Prüfung von Schaltpuffern, Schaltflächen,
analogues sensibles à la pression Schaltleinen und ähnlichen Einrichtungen
This European Standard was approved by CEN on 21 May 2004.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1760-3:2004: E
worldwide for CEN national Members.

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EN 1760-3:2004 (E)
Contents page
Foreword.3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .7
4 Requirements.12
4.1 General.12
4.2 Basic requirements.12
4.3 Specific requirements for pressure sensitive bumpers .20
4.4 Additional requirements for pressure sensitive plates .20
4.5 Specific requirements for pressure sensitive wires (Trip wires).21
5 Marking .22
5.1 General.22
5.2 Labels.22
5.3 Reference numbers .22
6 Information for selection and use.22
6.1 General.22
6.2 Essential data for the selection of a suitable device .22
6.3 Information for use .23
7 Verification .26
7.1 Verification of requirements applicable to all pressure sensitive protective devices
covered by this part of EN 1760 .26
7.2 Verification of requirements for pressure sensitive bumpers only.35
7.3 Verification of requirements for pressure sensitive plates only .36
7.4 Verification of requirements for pressure sensitive wires .37
7.5 Other tests .37
Annex A (normative) Timing diagrams.38
Annex B (informative) Explanatory notes concerning device characteristics.42
Annex C (informative) Design notes.45
C.1 General.45
C.2 Pressure sensitive bumpers.46
C.3 Pressure sensitive plates.52
C.4 Pressure sensitive wires.54
Annex D (informative) General application notes .56
D.1 General.56
D.2 Application of the sensor.57
D.3 Sensor mounting .59
D.4 Sensor positioning .59
D.5 Force imparted by the sensor .59
Annex E (informative) Notes on concerning commissioning and inspection .60
E.1 General.60
E.2 System information .60
E.3 Commissioning.60
E.4 Information for regular inspection and tests .61
E.5 Inspection and tests after maintenance .61
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EC Directive Machinery 98/37/EC, amended by Directive 98/79/EC.62
Bibliography .62
2

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EN 1760-3:2004 (E)
Foreword
This document (EN 1760-3:2004) has been prepared by Technical Committee CEN/TC 114 “Safety of
machinery”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by February 2005, and conflicting national standards shall be withdrawn
at the latest by February 2005.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.
This is the third part of a multi-part standard dealing with pressure sensitive protective devices which will cover
safety devices that detect the presence of a person through the application of a pressure or force by a part of
the persons body. After actuation they give a stop command which is used by the control system of a machine
to provide protection for the person who caused the device to be actuated.
The other parts are:
EN 1760-1, Safety of machinery - Pressure sensitive protective devices - Part 1: General principles for the
design and testing of pressure sensitive mats and pressure sensitive floors.
EN 1760-2, Safety of machinery - Pressure sensitive protective devices - Part 2: General principles for design
and testing of pressure sensitive edges and pressure sensitive bars.
The safeguarding of machinery (see EN ISO 12100-1: 2003, 3.20) can be achieved by many different means.
These means include guards which prevent access to the hazard zone by means of a physical barrier (e.g.
fixed guards to EN 953 and interlocking guards to EN 1088); and protective devices, (e.g. electro-sensitive
protective equipment to EN 61496 and pressure-sensitive protective devices to this European Standard).
Designers of machinery (including e.g. vehicles) should consider the way to achieve the required level of
safety taking into account the intended application and the results of the risk assessment (see EN 1050). The
best solution may combine several of these different means. It is recommended that the machinery / vehicle
supplier and the user examine together carefully the existing constraints before making their decision on the
choice of safeguarding means.
This European Standard does not specify the dimensions and the configuration of the effective sensing
surface of pressure sensitive protective devices in relation to any particular application. However, there is a
requirement for the manufacturer of any safety device to provide sufficient information to enable the user (i.e.
the machinery manufacturer and / or the user of the machinery) to specify an adequate arrangement.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
and United Kingdom.
3

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EN 1760-3:2004 (E)
Introduction
Pressure sensitive protective devices are used in a wide range of applications with different conditions of use
relating, for example, to the maximum and minimum values of loading, electrical, physical and chemical
environments. They are interfaced with machinery controls to ensure that the machine reverts to a safe
condition when the device is actuated.
The forces given in this document should not be considered as those which will always avoid injury or fatal
accidents. This depends upon several criteria which include the sensor, the actuating speed, the contact area,
the material used and the part of the body affected.
The forces given in this document are primarily intended for the purpose of assessing the performance of the
pressure-sensitive protective devices. These forces are under further investigation.
Each type of application of pressure sensitive protective devices can present particular hazards. It is not the
intention of this document to identify those hazards nor to recommend specific applications to particular
equipment. Particular applications may also necessitate special requirements which are not included in this
document.
This document is a type B standard as stated in EN 1070.
The provisions of this document may be supplemented or modified by a type C standard.
NOTE For machines which are covered by the scope of a type C standard and which have been designed and built
according to the provisions of that standard, the provisions of that type C standard take precedence over the provisions of
this type B standard.
4

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EN 1760-3:2004 (E)
1 Scope
This document deals with requirements for pressure sensitive protective devices which are not specified in
EN 1760-1 and EN 1760-2. The majority of these devices are produced for specific applications and are not
available as off-the-shelf items.
The purpose of this document relates primarily to safety and reliability rather than suitability. For the
relationship between safety and reliability, see EN 954-1: 1996, Annex D.
This document specifies requirements for pressure sensitive protective devices with and without an external
reset facility.
This document does not specify the dimensions of pressure sensitive protective devices in relation to any
particular application. Specific requirements for particular applications may be set out in relevant type C
standards.
The document does not cover stopping devices used only for the regular operation, including emergency
stopping, of machinery. It also does not apply to use in locations accessible to elderly or disabled persons or
children, where special additional requirements may be necessary.
Basic requirements are given for pressure sensitive protective devices not covered in EN 1760-1 and
EN 1760-2.
Specific requirements are given for the following devices:
 pressure sensitive bumpers;
 pressure sensitive plates;
 pressure sensitive wires (trip wires).
NOTE Some requirements are made with respect to electromagnetic compatibility (EMC). These are intended to
meet the requirements of the Council Directive 98/37/EC ("Machinery Directive") [1] only and not those of Council Directive
89/336/EC ("EMC Directive") [2].
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 954-1:1996, Safety of machinery – Safety-related parts of control systems - Part 1: General principles for
design.
EN 982, Safety of machinery - Safety requirements for fluid power systems and their components - Hydraulics.
EN 983, Safety of machinery - Safety requirements for fluid power systems and their
components - Pneumatics.
EN 999:1998, Safety of machinery - The positioning of protective equipment in respect of approach speeds of
parts of the human body.
EN 1070:1998, Safety of machinery – Terminology.
EN 60068-2-6, Environmental testing - Part 2: Tests - Tests Fc: Vibration (sinusoidal) (IEC 60068-2-6:1995 +
Corrigendum 1995).
5

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EN 1760-3:2004 (E)
EN 60068-2-14, Environmental testing - Part 2: Tests - Test N. Change of temperature (IEC 60068-2-14:1984
+ A1:1986).
EN 60068-2-29, Basic environmental testing procedures - Part 2: Tests; Test Eb and guidance: bump
(IEC 60068-2-29:1987).
EN 60204-1:1997, Safety of machinery - Electrical equipment of machines - Part 1: General requirements
(IEC 60204-1:1997).
EN 60439-1:1999 , Low-voltage switchgear and controlgear assemblies - Part 1: Type-tested and partially
type-tested assemblies (IEC 60439-1:1999).
EN 60529, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989).
EN 60947-5-1, Low-voltage switchgear and controlgear - Part 5-1: Electromechanical control circuit devices
(IEC 60947-5-1:1997).
EN 60947-5-5:1997, Low-voltage switchgear and controlgear - Part 5-5: Control circuit devices and switching
elements - Electrical emergency stop device with mechanical latching function (IEC 60947-5-5:1997).
EN 61000-4-2, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement
techniques - Section 2: Electrostatic discharge immunity test - Basic EMC publication (IEC 61000-4-2:1995).
EN 61000-4-3, Electromagnetic compatibility (EMC) - Part 4-3: Testing and measurement techniques;
Radiated, radio-frequency, electromagnetic field immunity test (IEC 61000-4-3:2002).
EN 61000-4-4, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement
techniques - Section 4: Electrical fast transient/burst immunity test, Basic EMV publication (IEC 61000-4-
4:1995).
EN 61000-4-5, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement
techniques - Section 5: Surge immunity test (IEC 61000-4-5:1995).
EN 61000-4-6, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement
techniques - Section 6: Immunity to conducted disturbances, induced by radio-frequency fields (IEC 61000-4-
6:1996).
EN 61000-6-2, Electromagnetic compatibility (EMC) - Part 6-2: Generic standards ; Immunity for industrial
environments (IEC 61000-6-2:1999).
EN ISO 12100-1:2003, Safety of machinery - Basic concepts, general principles for design – Part 1: Basic
terminology, methodology (ISO 12100-1:2003).
EN ISO 12100-2:2003, Safety of machinery - Basic concepts, general principles for design - Part 2: Technical
principles (ISO 12100-2:2003).
EN ISO 13849-2, Safety of machinery - Safety-related parts of control systems - Part 2: Validation
(ISO 13849-2:2003).
EN 60068-2-78, Environmental testing - Part 2-78: Tests; Test Cab: Damp heat, steady state (IEC 60068-2-
78:2001).
EN 60664-1:2003, Insulation coordination for equipment within low-voltage systems — Part 1: Principles,
requirements and tests (IEC 60664-1:1992).
6

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EN 1760-3:2004 (E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1070:1998 and the following apply.
3.1
pressure sensitive protective device
safety device of the 'mechanically actuated trip type' which can also act as an impeding device as defined in
EN ISO 12100-1: 2003, 3.27 intended to detect the touch of a person or part of a person
NOTE 1 They consist of:
— a sensor(s) which generates a signal when pressure is applied to part of its outer surface, and
— a control unit, which responds to the signal from the sensor and generates an output signal(s) to the control system of a
machine.
NOTE 2 Pressure sensitive protective devices can be used as tripping devices as well as presence-sensing devices as
defined in EN ISO 12100-1:2003, 3.26.5
3.1.1
pressure sensitive bumper
pressure sensitive protective device with a sensor which has the following characteristics:
 the cross section throughout the pressure sensitive area may be regular or irregular;
 the width of the cross section is usually greater than 80 mm.
 the effective sensing surface is deformed locally or may move as a whole
3.1.2
pressure sensitive plate
pressure sensitive protective device with a sensor which has the following characteristics:
 the effective sensing surface is normally, but not necessarily, flat;
 the width of the effective sensing surface is usually greater than 80 mm;
 the effective sensing surface moves as a whole
3.1.3
pressure sensitive wire
pressure sensitive protective device with a sensor which has the following characteristics:
 a wire, cord, rope, or cable held in tension;
 a change in the tension is detected to give an output signal
3.2
sensor
that part of the pressure sensitive protective device which generates a signal in response to sufficient
pressure applied to part of its surface
3.3
control unit
that part of the pressure sensitive protective device which responds to the condition of the sensor and
generates output signals to the machine control system
7

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EN 1760-3:2004 (E)
NOTE Definitions above describe the functional components of a pressure sensitive protective device. These
functions may be integrated into a single assembly or may be contained in any number of separate assemblies. (see
Figure 1).
3.4
output signal switching device
part of the control unit of a pressure sensitive protective device which is connected into the machine control
system and transmits safety output signal(s)
3.5
ON State of output signal switching devices
state in which the output circuit(s) is complete and permits the flow of current or fluid
3.6
OFF State of output signal switching devices
state in which the output circuit(s) is broken and interrupts the flow of current or fluid
3.7
actuating force
any force applied to the sensor which causes the output signal switching device to go to the OFF state
3.8
approach speed
approach speed is the relative speed at which contact is made between the surface of the sensor and a part
of the body
3.9
effective sensing surface
that part of the surface of the sensor or a combination of sensors, as stated by the manufacturer, where the
application of an actuating force creates an OFF state in the output signal switching device
3.10
effective sensing direction(s)
direction(s) of the actuating force from which the sensor will be actuated
3.11
dead surface
part of the surface area of the sensor outside the effective sensing surface
3.12
actuating travel
distance travelled by a specified object, moving in the direction of the applied actuating force measured from
the point where this object touches the effective sensing surface to the point where the output signal switching
device changes to an OFF state under specified conditions (see Figure 2)
NOTE Actuating travel can differ from pre-travel. Pre-travel on an edge or bar (see EN 1760-2) is travel in the
direction normal to the reference axis. Actuating travel is in the direction of the applied force.
3.13
working travel
distance travelled by a specified object, moving in the direction of the applied actuating force measured from
the point where this object touches the effective sensing surface, under specified conditions, to where a
specified force is exerted on the object (see Figures 2 and B.1)
3.14
over travel
difference between the working travel and the actuating travel when both of these distances are measured
with the same object applied under the same conditions (see Figure 2)
8

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EN 1760-3:2004 (E)
3.15
force-travel relationship
relationship between the force applied and the distance travelled by a pressure sensitive protective device in
operation (see Figure 2)
3.16
reset
function which permits an ON state in the output signal switching device provided that certain conditions are
met
3.17
mounting orientations
position in space of the sensor
3.18
presence-sensing device (PSD)
device that creates a sensing field, area or plane to detect the presence of a part of or a whole person
NOTE See 3.1, note 2.
3.19
total travel
movement or deformation of the effective sensing surface of a pressure sensitive protective device which is
measured in the direction of the actuating force, from the point of contact to the point where no further
significant deformation of the effective sensing surface occurs
9

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EN 1760-3:2004 (E)

Key
1 pressure sensitive protective device
2 sensor(s)
3 control unit (may be located within the machine control system or be part of the machine control system
e.g. as a logic block)
4 output signal switching device
5 part of the machine control system for pressure sensitive protective device output signal processing
6 actuating force
7 sensor output signal
8 ON state / OFF state signal
9 manual reset signal (where appropriate alternative to A)
10 reset signal from machine control system (where appropriate)
11 monitoring signals (optional)
A manual reset signal to the machine control system (where appropriate alternative to 9)
B machine control system(s)
Figure 1 — Pressure sensitive protective device applied to a machine
10

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EN 1760-3:2004 (E)

Key
1 stated limit force
2 lowest actuating force
a force (N)
b travel (mm)
c actuating travel
d over travel at 250 N
e working travel at 250 N
f over travel at 400 N
g working travel at 400 N
h total travel
A actuating point and actuating force at maximum operating speed
B force travel points B1 and B2 occur at a force of 250 N or 400 N at an operating speed of less than or
equal to 10 mm/s
C The force-travel point occurs at e.g. 600 N at an operating speed of less than or equal to 10 mm/s
NOTE Test piece 1 according to Table 1 is used to apply the forces.
Figure 2 — An example of a force-travel diagram
11

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EN 1760-3:2004 (E)
4 Requirements
4.1 General
The majority of devices covered by this standard are made for specific applications. Where appropriate, the
device manufacturer and the machine builder shall agree the requirements in accordance with the risk
assessment and specify the essential force-travel data for the application.
The device shall have dimensions and be positioned in such a way that the sensor shall detect by touch the
approach of a person or part of a person to a dangerous situation or a danger zone.
In general, there are two types of application:
 the device is used to stop the dangerous parts of machinery which are remote from the sensor. In this
application, the distance between the sensor and the moving parts of the machine shall be such that the
machine stops before any part of the body can reach the hazardous zone. The distance shall be
calculated on the basis of the principles presented in EN 999. See example in C.3.2;
 the sensor is mounted on the dangerous part of the machine or adjacent to it, so that the machine will
stop or reverse to a safe position after the sensor is actuated and before injury can occur. See example in
C.2.10.
The following basic requirements apply to all the devices covered by this document. Additional specific
requirements are given for pressure sensitive bumpers, pressure sensitive plates and pressure sensitive wires.
These specific requirements have priority over the basic requirements.
4.2 Basic requirements
4.2.1 Actuating force
NOTE 1 See 7.1.1 and 7.1.5 for verification.
The lowest actuating force(s) necessary to cause the output signal switching device to go to an OFF state
shall not exceed those specified in table 1 when applied:
 in the reference direction(s);
 over the effective sensing surface;
 at the relevant approach speed(s);
 with the sensor in the mounting orientations;
 with the relevant test piece and
 over the temperature range;
which the manufacturer of the device has specified or which have been agreed by the manufacturer of the
device and the machine builder(s).
The lowest actuating force may need to be less than that state
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