Overview
This warning system was designed for a laser testing lab and is used alongside machine interlocks to improve lab safety. It provides external indicators at two doors when laser testing may be active, uses an enable switch with a local active-status indicator, and sounds an alarm if either door is opened while the system is enabled.
The goal was simple: make the lab’s active state obvious from outside the room and add an audible warning if someone opens a protected door during active testing conditions.
Diagrams
Key Features
External Door Indicators
Provides visual warning at both lab entrances when the system is enabled and laser testing may be active.
Enable Switch
Uses a deliberate switch action to enable the warning system before testing begins.
Active Indicator
Includes a local indicator light so operators can confirm the warning system is enabled.
Door Monitoring
Uses normally-open door magnet switches that close when either protected door opens.
Audible Alarm
Sounds an alarm if a monitored door opens while the system is active.
Interlock Support
Designed to supplement machine interlocks and reinforce safe behavior during laser testing.
Technical Notes
The system uses a 24 VDC control circuit, an enable switch, indicator lights, magnetic door switches, and an alarm device. The design prioritizes clear status indication, simple troubleshooting, and practical installation in a working lab environment.
Status
The laser lab warning system is currently in use as part of a lab safety workflow.
It was designed to support safe operation during laser testing by making active conditions visible and adding an alarm response for door openings.