The Model 840 series Controller is used to drive any Model 740 Detectors to generate a curtain of infrared beams between the lift car doors.

Any interruption to the infra-red beams across the lift door opening activates a relay which, through the door operator, can stop or reverse the closure of the lift doors.

• Patented Power Reduction Software, giving extended component life
• New Static Mode Software, for installation with detectors fixed to the lift car
• Light immunity to over 100,000 lux
• Generates 40 parallel beams with optional 194 criss-cross beams with any 740 series Detector
• Different Timeout functions
• Advanced troubleshooting diagnostics using LED display
• Conforms to CE EMC Industrial Specification