Laser Safety Systems class 4 defeatable access recommendations

Our standard LSS-2380 warning module with visual and audible warning abilities mounts cleanly on the surface of the wall beside the entry door. The posted warning sign references this module to warn of the present laser state.

The warning meets the requirements of ANSI Z136.1-2007, sections 4.3.9.4, 4.3.9.4.1, and 4.3.9.4.2

$268

LSS-2381 Interlock control module to arm and disarm the laser interlock system. It is mounted on the wall surface at a convenient location in the laser area. The yellow illuminated arming button reminds workers in the area when the system is armed.

$260

LSS-2384 Laser/Shutter Interface Module attaches to the laser power supply interlock connector. It is mounted on the wall near the laser power supply or on the side of the laser table. The interlock system 24VDC power is brought in at this location from a wall-wart power supply at the same time the relay contacts for the laser are brought out.

$190

A client at a university has a class 4 laser lab with a single door and single laser table.

We cannot stress enough the importance of creating a safe environment in an educational setting. In addition to the liability involved in the event of an injury, the habits learned at a university may eventually be carried through to the work place. ANSI Z136.5-2000 for the Safe Use of Lasers in Educational Institutions requires compliance with the Z136.1 standards.

Class 4 laser areas in a research or university environment usually run long term experiments that require unattended operation. In such cases, defeatable entryway controls are appropriate. By design, persons who have been properly trained and given the keypad access code may momentarily "defeat" the interlock to enter and exit the laser controlled area protected by a magnetically locked door.

Laser Safety Systems recommends the following solution:

One LSS-2385 Door Access Control Kit.

The kit contains all necessary components to interlock a door for defeatable access in accordance with ANSI Z136.1-2007 section 4.3.10.2.2.

The Crash modules on each side of the door satisfy section 4.3.10.2 and fire safety codes that require the magnetic lock release in the event of emergency.

The included magnetic lock is a failsafe device. Removal of power immediately releases the door.

The dual door position switches form a redundant interlock on door position. In the unlikely event sufficient force were used to bypass the magnetic lock, the position switches would sense the unauthorized opening and trip the entire interlock system.

Complete Access Control Kit $1525

Note: This kit is also available without the magnetic lock and outer crash module for $1149

A typical entryway using the Laser Safety Systems products. In wall installation is possible

when client has a hollow wall by using low voltage drop-in boxes.

A proper Class 4 laser area setup for defeatable access control. Curtain design and layout varies with environment.

Example of the laser area exit. Note the limited use of surface track when door components must enter the in-wall system.

Example of the laser table interlock control components. Note the clean and effective use of our surface track mounting products when in-wall mounting is not possible.

An alternate method of mounting the laser table interlock control components

using a floor-to-ceiling steel box conduit. (Wiremold or equivalent)

This is common for laser tables placed in the center of a room.

PDF document of a typical installation wiring schematic. The client will receive a schematic that represents their own individual system installation.

Flash video tutorials of this system in operation are available on our flash lessons page.

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LSS2385 Installation and Operation Manual

Important features you should be aware of when considering an access controller:

Our LSS-2385 module utilizes our exclusive and proprietary "Intelligent Access Timing" as is described below:

Pre-Access timing: If an override is initiated but the door is not opened within 5 seconds (factory default), the override condition is canceled. A short cancellation tone is produced to convey the condition to the user. This "pre-access" timer can be adjusted via the programming keypad to any value between 5 and 15 seconds. The automatic cancellation avoids the wait that would otherwise occur in a non-intelligent access timer.
Access timing: If an override is initiated and the door is subsequently opened, the unit senses the opening and immediately transitions from pre-access mode to access mode where the access time programmed in the keypad is counted. During the countdown period, pressing any keypad button or pressing the push-to-exit button will restart the access timer. This is convenient at times when the door must be held open to bring in a large piece of equipment. The access timer can be adjusted via keypad to any value between 5 and 99 seconds.
Access warning time: If an access is started and the door is held open beyond the programmed access time, a screaming tone is produced to warn the user of an impending system trip to safe mode. If the door is closed during this warning tone period, the interlock will not trip. This warning tone factory default time is 5 seconds, but can be adjusted via keypad to any value between 5 and 15 seconds.
Post-Access automatic cancellation: When the door is closed after an access, the controller senses the closure and cancels the override condition within 2 seconds of closure. This allows the system to be ready for another entry or exit request without waiting for the normal timer to expire. As an example, a user of a non-intelligent entry system, as those carried by other manufacturers, may have his access timer set to 40 seconds. The user might pass through the door in 5 seconds, but the timer will continue to run for an additional 35 seconds. Another person approaching the door would typically need to wait for the timer to expire before entering his access code because the time remaining is an unknown. Even worse, a non-qualified person could approach this door and make entry during this "wait" period because they see that the controller is in an unlocked state.

Another major difference that distinguishes Laser Safety Systems access controller from those of other manufacturers is the fact that our controller is dedicated to a single door. One door, one controller. Two doors, two controllers. Why is this important? If a room is configured for two or more defeatable access doors, our system will independently grant access for each door. The systems sold by other manufacturers will unlock ALL doors that are configured for defeatable access for the timer period even though the access may have only been requested at a single location. This has serious potential safety implications.