Lasermet LS-200 User manual

LS-200 Instruction Manual
01297-53-000 Issue 4 19 January 2021
LASERMET LS-200
INSTRUCTION MANUAL
LASER SAFETY SHUTTER

LS-200 Instruction Manual
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LASERMET LS-200
Instruction Manual
Contents
1 Declaration of Conformity .................................................................................................. 3
2 Safety Warnings .................................................................................................................. 4
3 Concept ............................................................................................................................... 5
3.1 Control Options ........................................................................................................... 5
3.2 Indications ................................................................................................................... 6
4 Wiring ................................................................................................................................. 6
5 Installation .......................................................................................................................... 8
5.1 SIL-3 Version LS-200-SIL24 .......................................................................................... 8
5.2 Blade and Beam Dump Options .................................................................................. 8
6 Using with Powerful Lasers .............................................................................................. 10
7 Specifications .................................................................................................................... 11
8 Warranty ........................................................................................................................... 16
9 Contact Details .................................................................................................................. 17

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1 Declaration of Conformity
LASERMET LIMITED
LASER BEAM SHUTTER
Part no. LS-200-24 01297-00-000
LS-200 SIL24 01507-00-000
DECLARATION OF CONFORMITY
This is to certify that the Laser Beam Shutter designated by Lasermet Part Number LS-
200 and LS-200 SIL3 has been tested in accordance with the following directives and
standards and found to comply.
Lasermet certifies that this product complies with the basic requirements for health
and safety as provided by the following directives and standards:
Directives: Machinery Directive 2006/42/EC
EMC Directive 2014/30/EU
Standards: EN ISO 13849-1:2015
Safety of Machinery – Safety-related parts of Control Systems
EN 61010-1:2010 +A1:2016 +A2:2019
Safety Requirements for Electrical Equipment for Measurement,
Control and Laboratory use
Supplier:
Lasermet Limited
Lasermet House
137 Hankinson Road
Bournemouth
BH9 1HR
Dorset
United Kingdom
Country of Origin: England
Date: 10 June 2019

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2 Safety Warnings
This beam shutter works by diverting the incoming laser beam into an external beam dump. It is not
intended to absorb the laser energy within itself and can only successfully divert a laser beam if no
part of it becomes overheated.
Users must read and understand the section, ‘Using with Powerful Lasers’ later in this manual.
Be aware that once degradation starts to occur rapid failure is likely, possibly leading to the beam
passing unhindered through the shutter.
Due to the huge number of different types, powers and beam sizes of lasers Lasermet cannot
guarantee suitability of this shutter in every case and testing may be necessary to ensure that the
shutter provides the desired level of protection.
Always ensure that an appropriate beam dump is fitted.
This device is intended to be used as part of a safety system which may be used to protect personnel
and equipment from possible injury, damage, or loss.
As such it must be installed and wired according to these instructions and tested by suitably qualified
persons. No attempt may be made to tamper with the parts, open them, or use them outside of the
parameters contained herein.
The units are only designed to be fixed to surfaces using their inbuilt fixing holes. They must not
come into contact with each other or any other moving part when in use. The parts should never be
subject to impact or mechanical strain.
Safety switches should never be defeated or bypassed. It is imperative that all steps are taken to
ensure that any spare actuators are made unavailable, such that they cannot be used to defeat the
switch or reduce the protection offered by the system in any way.

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3 Concept
The Lasermet LS-200 Laser Safety Shutter is intended to provide a means of preventing accidental
exposure to a potentially harmful laser beam.
When open, the laser beam passes in clear air through the shutter. When closed, the shutter
deflects the incoming laser beam out of a separate port onto which a suitable external beam dump
must be fitted.
The shutter has been designed to form part of a high-integrity safety system and features a gravity-
close blade and force-disconnect proving contacts.
A ‘SIL3’ dual version is available which, when correctly wired to a Lasermet Interlock Control System
can provide a safety interlock which meets SIL-3 and EN13849-1 up to performance level ‘e’.
Lasermet provides a full range of laser interlock equipment including control systems, interlock
switches, illuminated warning signs, laser shutters, door locks, external power supplies etc. which
can be connected to provide a complete laser interlock system. Full support, design and installation
is available from Lasermet, please contact us for any queries. Contact details are given at the end of
this manual.
3.1 Control Options
The shutter is usually powered by a laser interlock system such as Lasermet ICS-6. These systems will
provide power to allow operation of the shutter once all safety interlocks (for example, doors,
covers etc.) have been closed. If the interlock system is tripped out, the shutter will immediately
close. It then cannot be opened until the interlock system is re-armed.
The shutter may be wired to operate in one of three different ways:
1) The Arming of the interlock system enables operation of the shutter. The buttons on top of
the shutter may then be used to open and close it as desired.
2) The Arming of the interlock system enables operation of the shutter. The shutter may then
be remotely opened and closed by external controls or buttons such as Lasermet’s LS-20 LS-
RS units. The buttons on top of the shutter may also be used.
3) The arming of the interlock system causes the shutter to open immediately.
The shutter may also be wired into bespoke custom systems.
The shutter operates on 24VDC and draws typically 200mA when open and 40mA when closed.
There is an initial impulse of approximately 1A on opening and the specification of power supplies
and cabling must take this into account.
SIL3 shutters draw twice as much current as standard units.
Note that the LS-200 will not operate on 12V systems as used for older LS-10 and LS-100 shutters.
Lasermet interlock systems can be reconfigured to provide the necessary 24V.

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3.2 Indications
The shutter has two sets of isolated volt-free monitor contacts which are available on its connector.
For maximum integrity the ‘shutter closed’ contacts are directly mechanically driven by the blade-
they do not rely on opto sensors or other noncontact methods. This means that the blade cannot
open without opening the ‘shutter closed’ contacts.
Each contact set has a common terminal which is connected to either the ‘open’ or the ‘closed’
terminal according to the state of the shutter. Each contact is rated at 100mA resistive load at
30VDC. The two sets of contacts are isolated from each other and from the control circuitry of the
shutter.
These contacts may be used by external circuitry to monitor and indicate the state of the shutter.
The shutter also has two low power indication outputs, one for open and one for closed. These
output 24VDC at 50mA maximum and are typically used to operate LED indicators on remote control
buttons.
The buttons on the shutter illuminate to show the state. A red light means the shutter is open, a
green indicates the safe condition, i.e. closed.
4 Wiring
The LS-200 shutter has a 15-way high density D plug. The connector makes available all of the
various control and indication features of both the standard and the ‘SIL3’ versions. The pin
connections are as follows:
1 0V
2 Monitor Contact 1 ‘Open’
3 Monitor Contact 1 Common
4 Monitor Contact 1 ‘Closed’
5 Monitor Contact 2 ‘Open’
6 ‘Open’ +24V output
7 Monitor Contact 2 Common
8 Remote Open Command +24V Input
9 Monitor Contact 2 ‘Closed’
10 Monitor Supply +24V
11 ‘Closed’ +24V output
12 Control Supply +24VDC input
13 Not used
14 Not used
15 Not used
Lasermet produce a range of Distribution Boxes and Remote Switches fitted with sockets specially
for use with LS-20 and LS-200 shutters, which provide convenient screw terminals to make
installation neat and simple. Units are available in both freestanding and fixed installation versions
and full wiring instructions are supplied with each one.

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Lasermet also supply extender cables to lengthen the shutter lead.
Diagram 1 below shows the usual basic control wiring between a Lasermet ICS-6 Interlock Control
System and LS-200.
Diagram 1. Basic Control Wiring between ICS-6 and LS-200
In this arrangement the shutter buttons are operative allowing the shutter to be opened and closed
when the ICS is armed.
If it is necessary for the shutter to open immediately the ICS is armed, fit a link to connect the
Remote Open Command input to the Control Supply +24V. Make sure the link is not connected to
the Monitor Supply.
Diagram 2 below shows how to implement a SIL-3 / EN13849 PL’e’ safety system using the ‘SIL3’
version of LS-200.
Diagram 2. Implementing a SIL-3 System using ‘SIL3’ LS-200

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Note for correct operation, installation wiring should use at least 16/0.2mm wire to avoid problems
of voltage drop on the wiring run. On very long distances, when using ‘SIL3’ shutters, or in situations
where two shutters may be connected simultaneously 24/0.2mm wire may be advisable for the 24V
supply wires.
For other options including the use of illuminated signs in conjunction with the shutter please
discuss your requirements with Lasermet.
5 Installation
The shutter baseplate has two mounting slots and a pair of M6 threaded T- nuts are provided which
are loaded into the slots through the beam entry and exit ports.
The slots allow for mounting and adjustment on a variety of standard optomechanical breadboards
as well as custom mounting. The slots are aligned with the beam centreline.
Both slots should always be used. Dimensions are given at the end of this manual.
The shutter has a through aperture of Ø50mm. The beam and beam dump ports are threaded M52 X
0.75mm. Lasermet can provide custom containment tubes and adaptors to order. Please contact us
for details at the address at the end of this manual.
Ensure that the laser beam is travelling in the direction of the arrow shown on the top of the shutter.
See the section, ‘Dimensions’ later in this manual.
5.1 SIL-3 Version LS-200-SIL24
To achieve EN13849-1 performance level ‘e’ the ‘SIL3’ version must be used wired as shown in
diagram 2. The ‘SIL3’ version is a twin unit which has one shutter behind another. Both shutters
must be open to allow the beam to pass through.
In this unit one set of monitor contacts is dedicated to one of the shutters, the other contact to the
other shutter, so the state of both blades can be monitored. When correctly interfaced to a
Lasermet ICS, the interlock system cannot be armed if either one or both blades are not detected
closed.
5.2 Blade and Beam Dump Options
It is vital that the external beam dump is mounted as close as possible to the shutter and that the
beam path is suitably contained to avoid risk of exposure.
Lasermet produce an air-cooled beamdump specifically for the LS-200 shutter, part number BD200-
AC.

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It is also possible to locate a laser power meter in place of the beam dump so that the laser power
can be determined while the shutter is closed. In this arrangement it is essential that the power
meter head damage threshold is sufficient to withstand the laser beam for the length of time for
which the laser may be active with the shutter closed.
Consideration should be given to the type of blade fitted, see below.
Note that the unit is primarily intended as a safety shutter rather than a precision beam diverter or
timing shutter. Due to the free moving nature of the blade the exact exit angle of the beam through
the beam dump aperture is slightly variable, therefore any external apparatus must be mounted as
close as possible to the shutter, it must have an aperture the same size or bigger than the port and
be able to accept small variations in beam position and angle.
Blade Type
The standard LS-200 has an angled bare stainless-steel blade with a non-precision surface which
deflects and to some extent scatters the beam. This surface is generally suitable for most
applications. To prevent permanent damage and invalidation of warranty it is essential that the
power density of the laser is insufficient to ablate the blade.
It is possible to order the LS-200 with other blade materials which may be more appropriate for
more powerful lasers.
The ceramic blade option is recommended for Q-switched lasers where the standard stainless-steel
blade may become ablated.
There are a number of mirror blade options featuring front silvered or dielectric mirrors for various
wavelengths. These allow the shutter to be used with higher power lasers than the standard blade.
The mirror blade option is also advisable when mounting a laser power meter at the beam dump
port.
For SIL3 shutters the laser beam will normally be directed out of the beam dump port nearest the
laser, however consideration should be given to the consequences if the first shutter fails to close
and the beam is directed to the second shutter beam dump port.
Observe the warnings given in the next section, ‘Using with Powerful Lasers’.

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6 Using with Powerful Lasers
If the blade or beam dump become overheated, they will be permanently damaged. Moreover, once
damage has started to occur the situation is likely to deteriorate further unless immediate action is
taken to turn off the laser.
Modern lasers which cut or burn are now readily available. With regard to the shutter blade, it is
essential that it absorbs insufficient energy for it to be damaged, which means that the excess must
be reflected away towards the beam dump.
At 20°C ambient the standard stainless steel blade can dissipate about 5W. The copper blade option
can dissipate no more than about 2.5W.
Glass mirror options can dissipate less because they are not such good conductors.
Heating of metal or metal-surfaced glass blades is likely initially to cause oxidisation which darkens
the metal causing it to absorb and heat more.
Furthermore, there may be localised damage if the laser has a high power density, i.e. the beam is
concentrated in a small diameter. For metal blades this appears as ablation, in which the area where
the beam impinges reaches the melting point of the metal before conduction can carry the heat
away. For glass mirror blades the localised heating expands the glass causing it to crack.
In all cases once the point of contact of the laser beam ceases to reflect as well, it will heat and fail. If
the laser is left running when this happens, the shutter will be progressively damaged and burn-
through of the beam may occur. Once damage has occurred a 100W laser may burn through the
stainless steel blade. More powerful lasers will burn through quite quickly. Also, any optional blade
mirror that has been fitted will detach if it exceeds several hundred degrees Celsius.
Ultimately users must be aware of the hazards of operating powerful lasers and the suitability of any
shutter being used. Tests may need to be undertaken to establish the suitability of any shutter when
used with powerful lasers.
The blade should be checked before use to ensure that it is spotlessly clean, unoxidised and
unblemished. Appropriate optical cleaning methods may be required to clean the blade. It must be
understood that whilst a perfectly clean blade will successfully divert a beam, should a speck of
contamination at the surface occur rapid progressive failure and burn-through are possible. Risk
assessments should be undertaken to determine the effects of such an event and identify any
mitigation measures that may be necessary.

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7 Specifications
Supply Voltage 24VDC
Current Closed 40mA
Opening 210mA
Open 110mA
Operating Time Fully Open 800ms
Fully Close 200ms
Aperture Ø50mm
Weight Single Shutter 1.6kg
Dual SIL Shutter TBC
Air-cooled Beamdump 1kg
Mounting 2x M6 threads, T-Nuts supplied
User Controls Open, Close
LED Indications Power, Open, Closed
Laser Blocking Specification
Irradiated Area
PEL (T2) 100s
PEL (T1) 10000s
4 mm2
5 MW/m2
5 MW/m2
20 mm2
2.5 MW/m2
2.5 MW/m2
80 mm2
1.3 MW/m2
1.3 MW/m2
Maximum Average beam power:
Using standard blade 100W
Using mirror blade As per mirror specification1
Also ensure that the beamdump specifications are not exceeded.
1 See section on Using with Powerful Lasers

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Safety Performance
Standard LS-200 EN ISO13849-1:2008 performance level ‘c’
LS-200 SIL-24 EN ISO13849-1:2008 performance level ‘e’
IEC 61508-1 SIL 3
when correctly wired to a suitably rated control system.
The LS-200 SIL-24 is a dual channel electromechanical safety laser shutdown device.
System Type Type A System
Hardware Fault Tolerance 1
When connected to an interlock control system as shown in this manual, the LS-200SIL-24 has the
following characteristics. This can also be achieved by correctly connecting to another suitable safety
control system which has dual channel monitoring of the shutdown device.
Safe Failure Fraction 95%
PFD 1.56 x 10-7
When used as described above, the LS-200SIL-24 is suitable for use as the sole laser shutdown device
in a system which is required to achieve Safety Integrity Level 3 (SIL 3) or lower as defined in IEC
61508.
Note: The actual SIL rating of the entire system will depend on the other system components, how
they are connected together and how the system is used.
Reliability
Mean time to dangerous failure (MTTFd) 100 years
Number of operations after which 10% of units have failed (B10d) > 1 x 107
It is important to note that the Performance Level established for the LS-200 are those that may be
achieved by the system when the board is properly integrated into a safety related part of a control
system.
Lasermet reserve the right to alter any specification without prior notice.

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Dimensions
Dimensions are approximate. Values given as ‘typical’ are average values measured across a number
of samples and are not guaranteed. Lasermet reserve the right to alter any specification without
prior notice.
LS-200 Single Version Outline Dimensions

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LS-200 Dual SIL Version Outline Dimensions

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LS-200 Air-cooled Heat Sink BD200-AC Outline Dimensions

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8 Warranty
Lasermet provide a 12-month warranty for defects in materials and manufacture, from the date of
installation or delivery. Installations completed by Lasermet are covered against defects in
workmanship for 12 months.
Damage or defects caused by other factors are not covered. For example, industrial contamination,
incorrect cleaning, storm damage. Consequential loss is not covered under warranty. Compensation
for indirect or direct loss or damage is expressly excluded. Rectification of the defects or a
replacement does not initiate a new warranty period.
For all deliveries, payments and other legal transactions, English law takes precedence for any
litigation.

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9 Contact Details
Lasermet provide a full range of laser interlock equipment including interlock switches, illuminated
warning signs, laser shutters, entry keypads with built-in fail-safe override timer, door locks, external
power supplies etc. which can be interconnected to provide a complete system. We also supply
equipment and consultancy covering all aspects of laser safety. Full support, design, and installation
is available from Lasermet, please contact us for any queries.
For sales and technical support:
Lasermet Ltd.
Lasermet House,
137 Hankinson Road,
Bournemouth
BH9 1HR
United Kingdom.
Tel: [phone]
Fax: [phone]
Email: [email protected]om
Website: www.lasermet.com
Lasermet Inc.
10N Martingale Road, Suite 400,
Schaumburg, Illinois 60173
United States.
Tel: [phone]
Email: [email protected]
Website: www.lasermet.com