EMX Industries, Inc. Tech support: 216-834-0761 2/8
IRB-RET_Rev2.0_080619 technical@emxinc.com
• IRB-RET Retroreflective photoeye, includes REFLECTOR-O-EX and mounting bracket
with hardware
• REFLECTOR-O-HD Gray plastic protective hood for reflector
• IRB-RET-HD Black powder-coated steel protective hood for photoeye
• REFLECTOR-O-EX White 3” diameter plastic reflector
UL325 requires continuous monitoring of all safety devices connected to gate and door operators.
Consult the gate or door operator manufacturer’s instruction manual for necessary monitoring
method.
• Normally Closed: Cycles power to the transmitter while monitoring the receiver contacts for proper
operation
• 10K Resistive Termination: Provides a measurable 10K ohm resistance across the normally open
(NO) when unobstructed
• Two-wire Pulse (2 Frequency): Provides 300Hz “heartbeat” unobstructed, 0Hz obstructed over
power supply lines
• Two-wire Pulse (3 Frequency): Provides 300Hz “heartbeat” unobstructed, 2Hz obstructed, and
0Hz failure over power supply lines
• Four-wire Pulse (2 Frequency): Provides 300Hz “heartbeat” unobstructed, 0Hz obstructed over
separate connection
• Four-wire Pulse (3 Frequency): Provides 300Hz “heartbeat” unobstructed, 2Hz obstructed, and
0Hz failure over separate connection
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