LS-20 High-Integrity Laser Shutters
High Integrity Laser Safety Beam Shutter
The Lasermet LS-20 Laser Safety Shutter is intended to provide a means of preventing accidental exposure to a potentially harmful laser beam.
- Gravity close blade
- Range of blade options
- Compatible with beam dumps
- Safety rated SIL3 option
Description
High-Integrity Safety Laser Beam Shutters
Lasermet’s LS-20 Series beam shutters are designed to form part of a high-integrity safety system and features a gravity-close blade and force-disconnect proving contacts. When closed, the shutter deflects the incoming laser beam onto an internal beam dump where the energy is converted to heat which is dissipated in the aluminium casing of the shutter. When the shutter is open, the laser beam passes through the shutter without interruption.
SIL Rated Version
A ‘SIL3’ version is available which, when correctly wired to a Lasermet Interlock® Control System, can provide a safety Interlock® which meets Safety Integrity Level 3 to EN61508 and Performance Level ‘e’ to EN ISO 13849-1.
Control Options
Standard operation is by means of the ‘Open’ and ‘Close’ buttons on top of the shutter case. The shutter can be operated remotely using a remote switching station (LS-RS20). Alternatively, the shutter can be programmed to open as soon as power is turned on. When the power is turned off, the shutter will always close.
Connection to Beam Tube System
The LS-20 has 16mm diameter entry and exit apertures. These are threaded and beam tubes can be supplied to fit to the shutter case and enclose the laser beam.
Beam Shutter for High Power Lasers
The maximum average power for use with the internal beam dump is 20W. However for higher powers the beam dump can be easily removed by unscrewing it from the side of the shutter case. Beam tubes can be fitted and the beam can be directed to a remote beam dump. This allows the shutter to be used for much higher powers, even for multi-kilowatt lasers.
Shutter Blade Options
The shutter blade is made of stainless steel, which is suited to the majority of applications. If necessary, standard front silvered or dielectric mirrors can be factory installed on the blade. When using the remote beam dump option, this is generally recommended for average powers in excess of 20W. It is also recommended when using Q-switched lasers, which can cause minor ablation of the blade even when the average power is less than 20W.
Fixings
The LS-20 shutter is equipped with an M6 female thread in the base, located under the beam centerline. An anti-rotation slot is also provided in the base into which a second M6 stud should be located to prevent the shutter turning or coming unscrewed. The slot allows for posts on imperial and metric optical breadboards.
LS-20 shutters are supplied with a permanently connected, 3m long lead, terminated with a 15 pin high density D connector (male). If required this can be extended by use of one or more 3m leads (part no. LEAD-LS20-3M).
Laser Beam Power Measurement
When fitted with a mirror, the LS-20 allows for simple laser beam power measurement. The beam dump can be removed and a laser power meter detector head installed on the shutter’s side. When the shutter is closed, a power or energy reading can be obtained in this manner.
Specifications
| Model No. | LS-20-24 | LS-20SIL-24 |
| Max Average Power Using Internal Beam Dump | 20 W | 20 W |
| Max Average Power Using Separate Beam Dump | Unlimited | Unlimited |
| Aperture Diameter | 0.63 inches (16 mm) | 0.63 inches (16 mm) |
| Operating Voltage | 24 V DC | 24 V DC |
| Current Closed | 30 mA | 60 mA |
| Current Open | 200 mA | 450 mA |
| Internal Beam Dump Cooling | Convection | Convection |
| Size (mm) | 3.88 x 1.38 x 2.54 inches (98.5 x 35 x 64.5 mm) | 3.88 x 2.76 x 2.54 inches (98.5 x 70 x 64.5 mm) |
| Mass | 1.32 lb (600 g) | 2.2 lb (1000 g) |
| Safety Integrity Level (to EN 61508) | TBA | SIL 3 |
| Certified to EN ISO 13849-1 Safety of machinery – Safety-related parts of control systems. Performance Level as shown | ‘c’ | ‘e’ |
| Lifetime | 5 x 105 Operations | 5 x 105 Operations |
Dimensions
LS-20-24
LS-20SIL-24
Remote Shutter Control
LS-RS30 Remote Shutter Switching Station
A remote switching station is available, allowing the shutter to be opened and closed by pressing buttons remote from the shutter itself. As well as start and stop buttons there is LED indication of ‘power on’, ‘open’ and ‘closed’.
Distribution Box for LS-20 Beam Shutters
These are wall mountable distribution boxes with terminals for connection to a Lasermet ICS Interlock® control system or other shutter power supply.
| Order code | Description |
| LS-RS30 | Remote switching station for shutters 1 shutter connection |
| ICS-DB30-0/2 | 2 shutter connections |
| ICS-DB30-1/1 | 1 shutter connection and 1 interlock connection |
