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About Light Curtains
Light curtains are also called light screens, optical guards, and presence sensing devices. Light curtains emit a "curtain" of infrared light beams in front of the hazardous area being protected. A stop signal is sent to the machine being guarded when any of the beams are blocked. Light curtains guard areas many meters wide, and can be diverted around corners using mirrors. Application areas include perimeter guarding for industrial robots and machinery, and point of access guarding for automated machine assemblies. A photoelectric transmitter projects an array of synchronized, parallel infrared light beams to a receiver unit. When an opaque object interrupts one or more beams, the light curtain controller sends a stop signal to the guarded machine. The transmitter unit contains light emitting diodes (LEDs) that emit pulses of invisible infrared light when energized by the light curtains timing and logic circuitry. Light pulses are both sequenced (one LED after another) and modulated (pulsed at a specific frequency). The receiver unit contains phototransistors and supporting circuitry to detect only the specific pulse and the frequency designated for it.
There are several important parameters to consider when specifying light curtains. These include spanning distance, protection height, sensitivity or resolution, response time, and operating temperature. The spanning distance is how far the transmitter and receiver can be separated and properly function. The transmitter and receiver must be able to function reliably within this minimum to maximum range of separation. Using mirrors reduces the operating range up to 25% per mirror. (Example: 6 inches to18 feet.) Protection height is the dimension of the active sensing field (correlates to the number of beams required). Sensitivity or resolution is the smallest sized object that will be positively detected by the light curtain. The response time of the light curtain is the maximum time between actuation of sensing function and the output relays. Operating temperature is the full-required range of ambient operating temperature.
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Engineering Web: Light Curtains
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Safety light curtains from Carlo Gavazzi Carlo Gavazzi light curtains, in conjunction with our safety modules, are suitable for use in applications up to category 4. Features include fixed |
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Light Curtains Light curtains Manufactures Light Curtains & Perimeter Access Guards Light Curtains Popular Light Curtains Sections: |
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- Measuring Light Curtains Light Barriers Measuring Light Curtains - Measuring Light Curtains Path: Online Catalog - Safety Products - - Measuring Light Curtains See Kim Controls, Industrial Automation Products Inc. Information |
Part Numbers for Light Curtains
| Part # | Distributor | Manufacturer | Product Category | Description |
|---|---|---|---|---|
| 2LBZ9 | Grainger Industrial Supply | OMRON STI | Light Curtains | Light Curtain,Single Beam,230 Ft. Range |
| 2LBY8 | Grainger Industrial Supply | OMRON STI | Light Curtains | Light Curtain,17.2 In Protected Height |
| 2LBY9 | Grainger Industrial Supply | OMRON STI | Light Curtains | Light Curtain,20.6 In Protected Height |
| 2LBZ3 | Grainger Industrial Supply | OMRON STI | Light Curtains | Light Curtain,30.9 In Protected Height |
| 2LBZ1 | Grainger Industrial Supply | OMRON STI | Light Curtains | Light Curtain,24.1 In Protected Height |
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