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The optical barrier ELM/VRF is made up of two self-contained units:

• The emitter ELM consists of a high intensity red laser, with optics incorporated, which emits a beam of modulated light towards the receiver.
• The receiver VRF consists of a lens, an optical filter, a photodiode receiver and amplifier circuitry to process the photodiode signal.
    

Working Principle       Up
The emitter ELM emits a high intensity, visible beam of modulated red laser light. This beam is received by a photosensitive diode fitted with an optical filter and whose signal is processed by the receiver VRF. The output changes state depending on whether the modulated beam is interrupted or not. The modulation of the emission, the particular characteristics of the optical filter and the automatic correction for ambient light render the sensor insensitive to ambient light or to any other source.
  

Special Features     Up

• Intense highly directive visible red laser beam (10 mW Class IIIb)
• Modulated beam which renders the sensor insensitive to ambient radiation
• A jack socket (located under the protective cover at the rear of the receiver) providing an output of signal strength as an aid during alignment
• A LED indicator showing operation of the receiver
• Water-cooling for use at ambient temperature greater than  50 ^oC

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