SRK 96
Protective retro-reflective photoelectric sensor
2019/08/02 607090-03
We reserve the right to make
technical changes
SAFE IMPLEMENTATION AND OPERATION
Original operating instructions
DEUTSCH ENGLISH FRANÇAIS ITALIANO ESPAÑOL NEDERLANDS
These connecting and operating instructions contain information on the approved purpose
and use of SRK
All information provided in the connecting and operating instructions, especially the Safety
Notices, must be observed.
Safety and warning notices are marked with the symbol.
Notes on important information are marked with the symbol.
Notes on the safety of laser devices are marked with the symbol.
These connecting and operating instructions must be kept in a safe place. It must be
available during the mission time of the SRK
sensors.
Leuze electronic GmbH + Co. KG is not liable for damages caused by improper use.
Knowledge of these connecting and operating instructions is considered an element
of proper use.
© Reproduction and duplication in whole or in part requires the express permission of
Leuze electronic GmbH + Co. KG
In der Braike 1
D-73277 Owen / Germany
Phone +49 (0) 7021 / 573-0
Fax +49 (0) 7021 / 573-199
info@leuze.de
www.leuze.com
96 protective retro-reflective photoelectric sensors.
96 protective retro-reflective photoelectric
2 SRK 96 Leuze electronic
Table of contents
1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Definition of terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4 Selection of optoelectronic protective devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5 Determination of the protected area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.6 Determination of the protective function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.7 Residual risks (EN ISO 12100-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 Intended use and foreseeable misuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Necessary competencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.3 Responsibility for safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.4 Exemption of liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.5 Special safety notices for applications with type 2 electro-sensitive protective
equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.6 Safety standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.7 Areas of application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.8 Laser safety notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.1 System description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.2 Description of functions of SRK 96 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.3 Testing of SRK 96 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.4 Functional safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4 Mounting and commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1 Components of the safety system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2 Integration in machine control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3 Display elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.4 Mounting the safety system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5 Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.1 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6 Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.1 Check before initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.2 Regular testing by competent personnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.3 Daily check of the effectiveness of the safety sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.1 Safety-relevant technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.2 General system data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.3 Dimensioned drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
GERMANENGLISHFRANÇAISITALIANOESPAÑOLNEDERLANDS
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Table of contents
GERMAN ENGLISH FRANÇAIS ITALIANO ESPAÑOL NEDERLANDS
4 SRK 96 Leuze electronic
1 General information
1.1 Certifications
The SRK 96 protective retro-reflective photoelectric sensor has been developed and
manufactured in accordance with the applicable European standards and directives.
Note:
The corresponding declaration of conformity can be requested from the manufacturer.
The manufacturer of the product, Leuze electronic GmbH & Co. KG in D-73277 Owen,
possesses a certified quality assurance system in accordance with ISO 9001.
1.2 General information
Electro-Sensitive Protective Equipment (ESPE) is part of the electrical equipment used on
machinery with inherent risks of bodily injury. It offers protection by telling the machine to
move into a safe operating state before a person is exposed to a dangerous situation
(EN
IEC 61496-1).
1.3 Definition of terms
General information
DEUTSCHENGLISHFRANÇAISITALIANOESPAÑOLNEDERLANDS
Electro-sensitive protective equipment (ESPE)
An assembly of parts and/or components that work together to pro v i d e a c c e s s p r o t e c t i o n o r
presence detection, and include at least the following:
• A sensor unit
• Control/monitoring components
• Output switching elements
AOPD Type 2
EN IEC 61496-1 describes various types of active opto-electronic protective devices
(AOPD) relative to the requirements of safe parts of controls (EN ISO 13849-1).
With AOPD Type 2, the requirements of Category 2 are fulfilled in accordance with
EN ISO 13849-1. A periodic function test must identify failures of the safety function. The
next machine cycle may not be approved in case of failure. A failure of the AOPD Type 2
between tests can lead to a loss of the safety function. In normal operation, at least one
output switching element of AOPD Type
equipment triggers or when the power supply of the AOPD is interrupted.
Leuze electronic SRK 96 5
2 must reach the OFF state if the sensor
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General information
Start interlock
DEUTSCH ENGLISH FRANÇAIS ITALIANO ESPAÑOL NEDERLANDS
Equipment that prevents machines from starting up automatically when the power supply of
the ESPE is switched on or interrupted and switched on again.
Startup test
A manual or automatic test which is performed after the ESPE was switched on. It tests the
complete safety-related control before normal machine operation is restored.
Restart interlock
A device which prevents an automatic restart of a machine after activation of the sensor
unit, after a change in the operating mode of the machine, and a change in the actuation
mode of the machine. Operating modes include:
• Jog
• Single stroke
• Automatic
Actuation modes include:
• Foot control
• Two-hand control
• Single-cycle or two-cycle triggering by the sensor unit of the ESPE
1.4 Selection of optoelectronic protective devices
The following strategy is to be applied (iterative process):
1. Determination of the protected area.
2. Determination of the protective function:
• Finger or hand protection
• Access protection for persons
• Presence detection
3. Determination of the mandatory safety performance level PLr.
4. Calculation of the mandatory minimum distance to the point of operation.
1.5 Determination of the protected area
The risk assessment must include the following:
• The size of the protective field
• The access points
• The danger zones
• Bypassing possibilities
6 SRK 96 Leuze electronic
1.6 Determination of the protective function
Access to the danger zone is protected.
A danger zone which is completely surrounded by permanently installed protective devices
is monitored for presence, or access guarding and presence detection are combined.
General information
1.7 Residual risks (EN ISO 12100-1)
The wiring suggestions shown in this manual have been tested with utmost care. The
relevant standards and regulations are adhered to if the shown components and appropri
ate wiring are used. Residual risks remain if
• the suggested wiring concept is not adhered to and, as a result, the connected safety-
relevant components or protective devices are not or are inadequately integrated into the
safety circuit.
• relevant safety regulations specified for the operation, adjustment and maintenance of
the machine are not adhered to by the operator. Here, the inspection and maintenance
intervals for the machine should be strictly adhered to.
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Safety
2 Safety
DEUTSCH ENGLISH FRANÇAIS ITALIANO ESPAÑOL NEDERLANDS
Before using the safety sensor, a risk assessment must be performed according to valid
standards (e.g. EN
EN IEC 62061). The result of the risk assessment determines the required safety level of
the safety sensor (see Table 2.1-1). For mounting, operating and testing, the document
"SRK 96 protective retro-reflective photoelectric sensor" as well as all applicable national
and international standards, regulations, rules and directives must be observed. Relevant
and supplied documents must be observed, printed and handed to the affected personnel.
Before working with the safety sensor, completely read and observe the documents
applicable to your task.
In particular, the following national and international legal regulations apply for the
commissioning, technical inspections and work with safety sensors:
• Machinery directive 2006/42/EC
• Low voltage directive 2014/35/EU
• Electromagnetic compatibility 2014/30/EU
• Use of work equipment directive
• Safety regulations
• Accident-prevention regulations and safety rules
• Ordinance on Industrial Safety and Health and employment protection act
• Device Safety Act
ISO 14121, EN ISO 12100-1, EN ISO 13849-1, IEC 61508,
Note!
For safety-related information you may also contact local authorities (e.g., industrial
inspectorate, employer's liability insurance association, labor inspectorate, occupational
safety and health authority).
DANGER!
Risk of death if start/restart is operated unintentionally!
The safety sensor detects persons only when they enter the danger zone but cannot tell
whether there are any persons inside the danger zone. A start/restart interlock is there
fore required.
The acknowledgment unit for unlocking the start/restart interlock must not be reachable
from the danger zone and must ensure a good view of the entire danger zone.
-
2.1 Intended use and foreseeable misuse
Warning!
A running machine can cause severe injuries!
Make certain that, during all conversions, maintenance work and inspections, the system is
securely shut down and protected against being restarted.
2.1.1 Intended use
• The safety sensor may only be used after it has been selected in accordance with the
respectively applicable instructions and relevant standards, rules and regulations
regarding labor protection and safety at work, and after it has been installed on the
machine, connected, commissioned, and checked by a competent person.
8 SRK 96 Leuze electronic
Safety
• When selecting the safety sensor it must be ensured that its safety-related capability
meets or exceeds the required Performance Level PL
ment.
The following table shows the safety-related characteristics of the SRK 96 protective retro-
reflective photoelectric sensor.
ascertained in the risk assess-
r
Type in accordance with EN IEC 61496-1 Type 2
Performance Level (PL) in accordance with EN ISO 13849-1:2015 when
combined with an MSI-TR1B or MSI-TSB
Category in accordance with EN ISO 13849-1:2015 when combined with
an MSI
-TR1B or MSI-TSB
Mean time to dangerous failure (MTTFd) 198 years
Mission time (TM) 20 years
Table 2.1-1: Safety-related characteristics of the SRK 96 protective retro-reflective
• The safety sensor protects persons at access points or at points of operation of
machines and systems.
• The safety sensor detects persons only when they enter the danger zone but cannot tell
whether there are any persons inside the danger zone. For this reason, a start/restart
interlock is mandatory.
• The construction of the safety sensor must not be altered. When manipulating the safety
sensor, the protective function is no longer guaranteed. Manipulating the safety sensor
also voids all warranty claims against the manufacturer of the safety sensor.
• The safety sensor must be tested regularly by competent personnel.
• The safety sensor must be exchanged after a maximum of 20 years. Repairs or the
exchange of wear parts do not extend the mission time.
• Electrical work must be carried out by a certified electrician.
• Only competent persons may configure and change the protective field for the personnel
protection.
photoelectric sensor
2.1.2 Foreseeable misuse
In principle, the safety sensor is not suitable as a protective device in case of:
• Danger posed by ejected objects or the spraying of hot or hazardous liquids from within
the danger zone
• Applications in explosive or easily flammable atmospheres
• Reachability of the point of operation by hand from the installation site of the safety
sensor
• Detection of the presence of persons in danger zones
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PL c
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Safety
2.2 Necessary competencies
DEUTSCH ENGLISH FRANÇAIS ITALIANO ESPAÑOL NEDERLANDS
The safety sensor may only be configured, installed, connected, commissioned, serviced
and tested in its respective application by persons who are suitably qualified for the given
task.
General prerequisites for suitably qualified persons:
• They have a suitable technical education.
• They are familiar with the relevant parts of the operating instructions for the safety
sensor and the operating instructions for the machine.
Task-specific minimum requirements for suitably qualified persons:
Configuration
Specialist knowledge and experience in the selection and use of protective devices on
machines as well as the application of technical rules and the locally valid regulations on
labor protection, safety at work and safety technology.
Mounting
Specialist knowledge and experience needed for the safe and correct installation and
alignment of the safety sensor with regard to the respective machine.
Electrical installation
Specialist knowledge and experience needed for the safe and correct electrical connection
as well as safe integration of the safety sensor in the safety-related control system.
Operation and maintenance
Specialist knowledge and experience needed for the regular inspection and cleaning of the
safety sensor – following instruction by the person responsible.
Servicing
Specialist knowledge and experience in the mounting, electrical installation and the
operation and maintenance of the safety sensor in accordance with the requirements listed
above.
Commissioning and testing
• Commissioning and testing: experience and specialist knowledge in the rules and
regulations of labor protection, safety at work and safety technology that are necessary
for being able to assess the safety of the machine and the use of the safety sensor,
including experience with and knowledge of the measuring equipment necessary for
performing this work.
• In addition, a task related to the subject matter is performed in a timely manner and
knowledge is kept up to date through continuous further training –
terms of the German Betriebssicherheitsverordnung (Ordinance on Industrial Safety and
Health) or other national legal regulations.
10 SRK 96 Leuze electronic
Competent person
in
2.3 Responsibility for safety
Manufacturer and operator must ensure that the machine and implemented safety sensor
function properly and that all affected persons are adequately informed and trained.
The type and content of all imparted information must not lead to unsafe actions by users.
Safety
The manufacturer of the machine is responsible for:
• Safe machine construction
• Safe implementation of the safety sensor
• Imparting all relevant information to the operating company
• Adhering to all regulations and directives for the safe commissioning of the machine
The operator of the machine is responsible for:
• Instructing the operating personnel
• Maintaining the safe operation of the machine
• Adhering to all regulations and directives for labor protection and safety at work
• Regular testing by competent personnel
2.4 Exemption of liability
Leuze electronic GmbH + Co. KG is not liable in the following cases:
• Safety sensor is not used as intended.
• Safety notices are not adhered to.
• Reasonably foreseeable misuse is not taken into account.
• Mounting and electrical connection are not properly performed.
• Proper function is not tested.
• Changes (e.g., constructional) are made to the safety sensor.
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2.5 Special safety notices for applications with type 2 electro-sensitive
DEUTSCH ENGLISH FRANÇAIS ITALIANO ESPAÑOL NEDERLANDS
protective equipment
Attention!
Type 2 protective devices are to be used when permitted by a machine-specific C-standard
or risk assessment acc. to EN
Attention!
When type 2 protective devices are used, the protective function is checked during periodic
testing. Between the test periods, errors may cause the protective function to be temporarily
lost, which is only discovered during the next test.
The availability of the protective function is higher the shorter the test periods are. Support
is available here through the organizations responsible for machine safety, such as the
technical expert committees of the employer's liability insurance associations.
Optimum type 2 functional reliability is attained with the intelligent, modular MSI safety
interface system, among others, or a test monitoring unit from Leuze electronic.
ISO 14121 and/or EN ISO 13849.
2.6 Safety standards
The SRK 96 protective retro-reflective photoelectric sensor was developed in accordance
with the currently applicable safety standards and submitted for EC type examination. The
SRK
96 meets the safety-related requirements specified by EN IEC 61496-1/-2 type 2.
The SRK 96 is a laser retro-reflective photoelectric sensor of laser class 1 as per IEC/
EN 60825-1:2014.
12 SRK 96 Leuze electronic
2.7 Areas of application
In combination with a test monitoring unit (MSI-TR1B or MSI-TSB), the SRK 96 protective
retro-reflective photoelectric sensor can be used as a disconnecting protective device for
safeguarding danger zones at power-driven machinery.
It is approved for the following areas of application (excerpt):
• Edge, frame, star and carcass presses in wood processing
• Printing and paper processing machines
• Power-operated windows, doors and gates
• Storage equipment and devices
• Textile machinery
• Food processing equipment
• Packaging machinery
• Meat processing equipment
• Machinery in the chemical, rubber and plastics industries
2.8 Laser safety notices
CLASS 1 LASER PRODUCT
The device satisfies the requirements of IEC 60825-1:2014 (EN 60825-1:2014) for a
product of laser class 1. Complies with 21 CFR 1040.10 except for conformance with
IEC 60825-1 Ed. 3, as described in Laser Notice No. 56, dated May 8, 2019.
Observe the applicable statutory and local laser protection regulations.
The device must not be tampered with and must not be changed in any way.
There are no user-serviceable parts inside the device.
Repairs must only be performed by Leuze electronic GmbH + Co. KG.
Safety
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Safety
A Laser aperture
B Laser warning sign
A
B
DEUTSCH ENGLISH FRANÇAIS ITALIANO ESPAÑOL NEDERLANDS
Figure 2.8-1: Laser aperture and laser warning sign
Note!
Additional measures may be required to minimize the impact of ambient light on the
electro-sensitive protective equipment. Welding sparks or warning lights, e.g., from forklifts
passing by, may impact the fault-free function of the protective device.
14 SRK 96 Leuze electronic
3 Function
3.1 System description
In combination with a special reflector PTKS 20x40, PTKS 50x50 (preferred type) or PTKS
100x100, the SRK 96 protective retro-reflective photoelectric sensor works as a sensor unit
in an active opto-electronic protective device (AOPD) according to EN IEC 61496-2 type 2.
Combined with a suitable test and monitoring unit it constitutes an electro-sensitive
protective equipment (ESPE) according to EN
Attention!
The system does not work with conventional standard reflectors.
To use the system pursuant to EN IEC 61496-1 type 2, it must be connected to a
corresponding test monitoring unit (e.g., MSI-TR1B, MSI-TSB). The test monitoring unit
cyclically monitors the functionality of the connected protective retro-reflective photoelectric
sensor every two seconds.
3.2 Description of functions of SRK 96
The SRK 96 protective retro-reflective photoelectric sensor is a single-lens, laser photo-
electric sensor.
The light beams transmitted by the transmitter are incident on a reflector unit which is
mounted stationary on the opposite side of the monitored area. The light beams reflected
from there are correspondingly evaluated by the receiver unit.
The unique feature of the reflector unit is that a polarization filter is positioned in front of a
triad-type reflector. This ensures that only linearly polarized light can be reflected.
The amount of linearly polarized light and unpolarized light is compared in the receiver unit
via a corresponding evaluation system.
If the beam path is interrupted by a diffusely reflecting object or a standard reflector
(unpolarized), a clearly distinguishable polarization ratio will arise.
Function
DEUTSCHENGLISHFRANÇAISITALIANOESPAÑOLNEDERLANDS
IEC 61496-1 type 2.
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Function
3.3 Testing of SRK 96
DEUTSCH ENGLISH FRANÇAIS ITALIANO ESPAÑOL NEDERLANDS
The SRK 96 must be tested by switching the input voltage on the activation input on and
off. If the voltage on the activation input falls to under 2 V, the switching output follows after
approx. 8.5 ms and switches off. A minimum delay of >1 ms must be monitored.
Once the voltage on the input exceeds 8 V again, the switching output switches back on
after approx. 2.7 ms.
When connected to an MSI-TR1B or MSI-TSB, testing is automatically enabled, monitored,
and evaluated by the test monitoring unit. The output safety circuit of the test monitoring
unit remains switched on if the test was successful.
Attention!
No more than three devices in series may be connected to a tester! When replacing a
photoelectric sensor, the effectiveness of the safety sensors of all devices installed in the
series connection must be tested pursuant to Chapter 6.3!
16 SRK 96 Leuze electronic
3.4 Functional safety
Device malfunctions must be identified by test monitoring and managed by switching to the
safe state.
For test monitoring units MSI-TR1B and MSI-TSB, this was validated by means of an EC
type examination pursuant to EN
Reaction times:
1x SRK96 + MSI-TR1B Max. reaction time: 80 ms
2x SRK96 + MSI-TR1B Max. reaction time: 80 ms
3x SRK96 + MSI-TR1B Max. reaction time: 80 ms
The type of testing undertaken by the MSI-TR1B evaluation unit does not impact the
reaction time when two or three sensors are connected. The maximum reaction time
remains at 80 ms.
1x SRK96 + MSI-TSB Max. reaction time: 620 ms
2x SRK96 + MSI-TSB Max. reaction time: 620 ms
3x SRK96 + MSI-TSB Max. reaction time: 620 ms
The type of testing undertaken by the MSI-TSB evaluation unit does not impact the reaction
time when two or three sensors are connected. The maximum reaction time remains at
620 ms.
When cyclical testing is otherwise produced, please observe the requirements of
EN
IEC 61496-1 type 2 and EN ISO 13849-1.
Function
IEC 61496-1 type 2.
DEUTSCHENGLISHFRANÇAISITALIANOESPAÑOLNEDERLANDS
Figure 3.4-1: Overview of test parameters of type 2 testing
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Function
DEUTSCH ENGLISH FRANÇAIS ITALIANO ESPAÑOL NEDERLANDS
Test duration: The duration must be selected based on the application. Detection is
disabled during this time. The duration may not adversely impact the safety function.
Sensor OFF time: The times of the test impulse of the evaluation unit must be selected to
ensure that the maximum sensor OFF time of an SRK
Sensor response time: The response time of the sensor system depends on the type and
number of photoelectric sensors. The response time must be monitored to ensure that the
cycle time of the testing is complied with (see DIN EN ISO 13849-1:2015)
The SRK 96 does not test the wiring for short circuits. This must be provided by the
superior testing system.
96 does not exceed 90 ms.
18 SRK 96 Leuze electronic
4 Mounting and commissioning
4.1 Components of the safety system
The complete safety system consists of up to three SRK 96 protective retro-reflective
photoelectric sensors with a corresponding number of reflectors PTKS 20 x 40,
PTKS 50 x 50 (preferred type) or PTKS 100 x 100 and the associated test monitoring circuit/
device (e.g., MSI-TR1B or MSI-TSB).
4.2 Integration in machine control
The electrical integration in the control must be implemented according to the defined
safety category pursuant to EN ISO 13849-1. The potential-free safety relay outputs of a
test monitoring unit, e.g., the MSI-TR1B or MSI-TSB can be directly used to switch off the
dangerous movement.
The advantages of using an MSI-TR1B or MSI-TSB test/monitoring unit is that an EC type
examination is available for all subsystems of the ESPE.
This means that validation in accordance with EN IEC 61496-1 is no longer required, as
this was already undertaken by the manufacturer and the inspection body.
Depending on the integration, it may be necessary to use contactor monitoring or a start/
restart interlock. These functions are already integrated in the MSI
devices.
4.3 Display elements
Two LEDs are integrated in the SRK 96 protective retro-reflective photoelectric sensor.
The LEDs indicate the following operating states:
• Green LED Ready (supply voltage applied)
• Yellow LED Light path free (output connected through)
• Yellow LED, flashing Light path free, no function reserve.
Mounting and commissioning
DEUTSCHENGLISHFRANÇAISITALIANOESPAÑOLNEDERLANDS
-TR1B and MSI-TSB
4.4 Mounting the safety system
4.4.1 Mounting the SRK 96 protective retro-reflective photoelectric sensor
When mounting the SRK 96, it must be ensured that the specific reflector for this purpose,
i.e., the PTKS 20 x 40, PTKS 50 x 50 (preferred type) or PTKS 100 x 100, is mounted in the
correct position. The reflector must be mounted so that its mounting surface (back) is
perpendicular to the optical axis.
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Mounting and commissioning
90˚
± 5˚
=
Correct alignment Incorrect alignment
PTKS 50 x 50:
Alignment via
slotted hole for
compensation of
vertical tolerances
Correct alignment
(inclined front)
Incorrect alignment
(the front cannot be perpendicular to the
optical axis)
To ensure high system availability when installing the SRK 96, make sure that there are no
DEUTSCH ENGLISH FRANÇAIS ITALIANO ESPAÑOL NEDERLANDS
high-emittance light sources within the beam path. It might be necessary to replace the
SRK
96 and PTKS… reflector or to mount them so that the light source is not within the
direct beam path. During installation, please make sure that no strongly reflective surfaces
or standard reflectors are within the immediate vicinity of the PTKS… reflector.
Figure 4.4-1: Reflector alignment
Attention!
The system will not function if the reflector is mounted in the wrong direction.
20 SRK 96 Leuze electronic
Mounting and commissioning
5
Ø 5
Ø 6.5
Use mounting sleeves when mounting to or
between plane-parallel surfaces!
Mount the SRK 96 so that the front screen is not mechanically distorted. We recommend
fastening the photoelectric sensor only to the provided fastening holes. Use the mounting
sleeves included when mounting to or between plane-parallel surfaces
Figure 4.4-2: Mounting to or between plane-parallel surfaces
Attention!
After aligning the SRK 96 to the PTKS… reflector (the yellow LED on the SRK 96 is
illuminated), the horizontal pitch of the light axis must be checked. The reflector mounting
surface must be at a right angle to the light axis
(see fig. 4.4-1).
The valid standards and regulations must be observed when mounting protective photo-
electric sensors.
(see fig. 4.4-2).
DEUTSCHENGLISHFRANÇAISITALIANOESPAÑOLNEDERLANDS
Note:
To ensure that the entire safety system works properly, you must observe the mounting
instructions in this chapter.
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Mounting and commissioning
4.4.2 Safety distance
DEUTSCH ENGLISH FRANÇAIS ITALIANO ESPAÑOL NEDERLANDS
Safety distance
Optical protective devices can only perform their protective function if they are mounted
with adequate safety distance. When mounting, all delay times must be taken into account,
e.g. the response times of the safety sensor and the control elements as well as the
stopping time of the machine. The following standards specify calculation formulas:
•EN 13855, "The positioning of protective devices in respect of approach speeds of parts
of the human body": mounting situation and safety distances
•EN IEC 61496-2, "Active optoelectronic protective devices": distance of the reflective
surfaces/deflecting mirrors
Figure 4.4-3: Safety distance to the danger zone
Calculating the safety distance
General formula for calculating the safety distance S of an optoelectronic protective device
acc. to EN ISO 13855 or EN 13855:
S = K * T + C
S [mm] = Safety distance
K [mm/s] = 1600 mm/s (gripping and approach speed)
T [s] = Total time of the delay
C [mm] = 850 mm (default value for arm length)
22 SRK 96 Leuze electronic
Mounting and commissioning
Calculate the safety distance S for access guarding using the formula acc. to
EN
ISO 13855 or EN 13855:
S = 1600 mm/s*(ti+ tm) +850 mm
S [mm] = Safety distance
ti [s] = Response time of the safety interface device
tm [s] = Stopping time of the machine
Calculation example
A machine with a stopping time of 500 ms and safeguarding with the SRK 96 (safety
sensor) and a safety relay MSI-TR1B (safety interface) is assumed.
S = K * (ti+ tm)+ C
K [mm/s] = 1600 mm/s
ti [s] = 80 ms
tm [s] = 500 ms
C [mm] = 850 mm
This results in:
S [mm] = 1600 mm/s x 0.580 s + 850 mm
S [mm] = 1778 mm
DEUTSCHENGLISHFRANÇAISITALIANOESPAÑOLNEDERLANDS
TNT 35/7-24V
Leuze electronic SRK 96 23
Mounting and commissioning
a
a
b
b
a
b
4.4.3 Multi-axis arrangement
DEUTSCH ENGLISH FRANÇAIS ITALIANO ESPAÑOL NEDERLANDS
With multi-axis installation of the protective retro-reflective photoelectric sensors, the light
beams must run parallel to the reference plane (e.g. to the floor).
Mount adjacent devices with parallel beam direction.
Note!
No more than three devices in series may be connected to a tester. When replacing a
photoelectric sensor within a series connection, all sensors must be checked for mutual
interference through tests according to Chapter
Figure 4.4-4: Beam direction with multi-axis arrangement
a = Protective retro-reflective photoelectric sensor
b = PTKS reflector
6.3.
If the protective retro-reflective photoelectric sensors are arranged in parallel, further
measures for the prevention of mutual interference are required.
Beam distances must be selected according to table 4.4-1.
The mounting brackets of the protective retro-reflective photoelectric sensors must be
secured against turning.
Number of beams Heights above reference plane,
1 750 1200
2
3 300, 700.1100 850
Table 4.4-1: Beam spacing in accordance with EN ISO 13855
a. For the lowest beam, 400 mm are only permissible if allowed by the risk assessment.
24 SRK 96 Leuze electronic
400a, 900
e.g. floor [mm]
Additional distance C [mm]
850
4.4.4 Distance to reflective surfaces
d
e
f
5˚
5˚
c
Ensure that the safety sensor is installed with sufficient distance between the optical axis
and the reflective/mirroring surfaces.
Warning!
Failure to maintain minimum distances to reflective surfaces may result in serious injury!
Reflective surfaces can indirectly deflect the transmitter beams to the receiver. In this case,
interruption of the protective field is not detected.
Determine the minimum distance a (see Figure 4.4-5).
Make certain that all reflective surfaces are the necessary minimum distance away from
the protective field according to IEC/EN 61496-2 (see figures
Check that reflective surfaces do not impair the detection capability of the safety sensor
before start-up and at appropriate intervals.
Mounting and commissioning
DEUTSCHENGLISHFRANÇAISITALIANOESPAÑOLNEDERLANDS
4.4-6 and 4.4-7).
Figure 4.4-5: Minimum distance to reflective surfaces
a = Distance to the reflective/mirroring surface
b = Protected field width
c = Reflective/mirroring surface
d = Protective retro-reflective photoelectric sensor
e = PTKS reflector
f = Object
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Mounting and commissioning
a
900
200
800
300
400
600
500
700
3
50.5 10
b
262
a
500
3500
1000
1500
2500
2000
3000
3
20 40
60
70
b
262
100.5
30
50
DEUTSCH ENGLISH FRANÇAIS ITALIANO ESPAÑOL NEDERLANDS
Figure 4.4-6: Minimum distance to reflective surfaces as a function of the protective
field width up to 10
m
a = Required minimum distance to reflective surfaces [mm]
b = Protective field width [m]
Figure 4.4-7: Minimum distance to reflective surfaces as a function of the protective
field width
a = Required minimum distance to reflective surfaces [mm]
b = Protective field width [m]
26 SRK 96 Leuze electronic
5 Electrical installation
The electrical installation must be undertaken by authorized, qualified personnel. During
installation, it must be ensured that the power supply and signal lines are installed away
from power lines. In the switch cabinet it must be ensured that corresponding spark
suppression for contactors is used. For drive motors and brakes, make sure to observe the
installation notes in the corresponding operating instructions.
5.1 Electrical connection
The electrical connection of the SRK 96 must be implemented according to the connection
diagrams below.
The activation input (terminal 4 / at plug connection PIN 2) is active when a DC voltage of
8 V is applied. The transmitter is now working and emits visible red light.
If the activation input drops below a DC voltage of 2 V, the internal test of the SRK 96 is
triggered.
The activation input is normally controlled by the test monitoring circuit, e.g., MSI-TR1B or
MSI-TSB.
Laying cables!
Lay all connection cables and signal lines within the electrical installation space or per-
manently in cable ducts.
Lay the cables and lines so that they are protected against external damages.
For further information: see EN ISO 13849-2, Table D.4.
Note!
Power must only be supplied from a power supply unit with secure electrical insulation
(SELV/PELV).
Electrical installation
DEUTSCHENGLISHFRANÇAISITALIANOESPAÑOLNEDERLANDS
5.1.1 Electrical connection diagrams (supply only with SELV/PELV power supply unit)
Figure 5.1-1: Electrical connection diagrams
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Electrical installation
DEUTSCH ENGLISH FRANÇAIS ITALIANO ESPAÑOL NEDERLANDS
Connection diagram of SRK 96 with MSI T
+24V
SRK 96
-A3
MSI-T
5
+24V
0V
6
Activ
SRK 96
Activ
SRK 96
Activ
0V
PE
RES
w/o RES
14 15 22 21 13
Var. A
24 29 3123
16
St ar t
active
-K2-K1
Error
Var. B
-K1
-K2
Figure 5.1-2: Connection of SRK 96 with MSI T
Note!
No more than three devices in series may be connected to a tester.
-K1
L+ L+
1
-K2
2
reset
Sta t e
Err o r
7 8 30 32
*
A1
-K1
-K2
A2
L- L-
+24V
1
2
*
A1
A2
0V
PE
28 SRK 96 Leuze electronic
6 Test
The checks should ensure that the Optoelectronic Protective Devices have been used acc.
to the national/international regulations, in particular in accordance with the machine and
work-equipment directive.
Test
6.1 Check before initial commissioning
• Observe the nationally and internationally valid regulations.
• Is the required safety distance (protective field of the safety sensor to the next point of
operation) maintained?
• Is the safety sensor effective during the entire dangerous movement and in all adjustable
operating modes of the machine?
• It must not be possible to climb over, climb under or circumvent the light path.
• Ensure that the sensor only detects persons upon entry to the danger area and does not
detect whether persons are located within the danger area.
• Is a start-up/restart interlock present?
• Before they begin work, have a competent person train the operating personnel in their
respective tasks.
6.2 Regular testing by competent personnel
The reliable interaction of safety sensor and machine must be periodically tested in order to
detect changes to the machine or impermissible tampering with the safety sensor.
• Have all tests performed by competent personnel.
• Observe the nationally and internationally applicable regulations and the time periods
specified therein.
• Test the effectiveness of the safety sensor with a test rod Ø 50 mm
6.3 Daily check of the effectiveness of the safety sensor
It is of utmost importance to check the effectiveness of the protective field. This serves to
ensure that the protective function remains intact when parameters change or changes are
made in the environment of the individual points of the protective field.
Interrupt the light beam between the transmitter and receiver (test object 50 mm)
• In front of the SRK 96 and the reflector
• In the middle between the SRK 96 and the reflector
• Before and after the deflecting mirror
It must not be possible to initiate the dangerous state during beam interruption.
If the operating voltage is disconnected, the effectiveness of the protective field must be
checked again.
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1
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1. Surface/material retroreflective according to EN 471, Class 2, or similar
Leuze electronic SRK 96 29
Technical data
7 Technical data
DEUTSCH ENGLISH FRANÇAIS ITALIANO ESPAÑOL NEDERLANDS
7.1 Safety-relevant technical data
Type in acc. with EN IEC 61496-2 Type 2
Performance Level (PL) in accordance with EN ISO 13849-1:2015 when
combined with an MSI-TR1B or MSI-TSB
Category in accordance with EN ISO 13849-1:2015 when combined with
an MSI
-TR1B or MSI-TSB
Mean time to dangerous failure (MTTFd) 198 years
Mission time (TM) 20 years
7.2 General system data
Optical data
Typ. operating range limit 1)
Operating range 2)
With reflector PTKS 50 x 50 (preferred type)
Light source Red light laser diode
Wavelength 650 nm
Detection capability (resolution) 50 mm
Max. power (peak) 12 mW
Pulse duration 10 µs
Laser class 1 in acc. with IEC 60825-1:2014
Time behavior
Switching frequency 100 Hz
Response time 12 ms
Readiness delay 250 ms
Electrical data
Operating voltage U
Residual ripple 15 % of U
1) Typ. operating range limit: max. attainable range without function reserve
2) Operating range: recommended range with function reserve
3) 1=transient protection, 2=polarity reversal protection, 3=short circuit protection for all outputs,
4=interference blanking
4) Rating voltage 250 VAC / overvoltage category II
Table 7.2-1: Technical data
PL c
Cat. 2
0.5 … 7 m
0.5 … 6 m
(EN 60825-1:2014)
B
10 … 30 V DC (incl. residual ripple)
B
30 SRK 96 Leuze electronic
Technical data
Input current (without load) 40 mA
Switching output PNP transistor
Function Light switching
Signal voltage high/low (UB - 2 V) / 2 V
Output current Max. 100 mA
Indicators
Green LED Ready
Yellow LED Light path free
Yellow LED, flashing Light path free, no function reserve
Mechanical data
Housing Diecast zinc
Color Yellow
Optics cover Glass
Weight 380 g
Connection type Terminals or M12 connector
Environmental data
Ambient temp. (operation/storage) -10 °C … +50 °C/-30 °C … +60 °C
Protective circuit 3
VDE protection class 4
Air humidity Humidity class G in accordance with IEC 68 part
Storage temperature -30°C - +60°C
Degree of protection IP 67
Impact resistance Semi-sine 30 gn, 11 ms (VDE 0660 T 208)
Vibration resistance 10 … 55 Hz, max. 7.5 gn (VDE 0660 T 208)
EMI/EMC In acc. with EN IEC 61496-1
Additional functions
Activation input active/inactive 8 V/ 2 V
Input resistance 10 k± 20 %
Activation/disable delay 6 ms
1) Typ. operating range limit: max. attainable range without function reserve
2) Operating range: recommended range with function reserve
3) 1=transient protection, 2=polarity reversal protection, 3=short circuit protection for all outputs,
4=interference blanking
4) Rating voltage 250 VAC / overvoltage category II
Table 7.2-1: Technical data
1, 2, 3, 4
II, all-insulated
2-3
DEUTSCHENGLISHFRANÇAISITALIANOESPAÑOLNEDERLANDS
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Leuze electronic SRK 96 31
Technical data
A Green indicator diode
B Yellow indicator diode
C Transmitter/receiver
D Optical axis
E Device plug M12
F Screwed cable gland M 16 x 1.5 for Ø 5 … 10 mm
G Countersinking for SK nut M 5, 4.2 deep
H Connection terminals
I Cable entry
7.3 Dimensioned drawings
DEUTSCH ENGLISH FRANÇAIS ITALIANO ESPAÑOL NEDERLANDS
Figure 7.3-1: SRK 96 dimensioned drawing
32 SRK 96 Leuze electronic
Figure 7.3-2: Dimensioned drawing of PTKS… reflectors
PTKS 20 x 40 PTKS 50 x 50
(preferred type)
PTKS 100 x 100
Technical data
DEUTSCHENGLISHFRANÇAISITALIANOESPAÑOLNEDERLANDS
Leuze electronic SRK 96 33
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Technical data
DEUTSCH ENGLISH FRANÇAIS ITALIANO ESPAÑOL NEDERLANDS
34 SRK 96 Leuze electronic
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