Photo of the IRB-RET photoeye sensor

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The IRB-RET provides a universal solution for entrapment protection. One photoeye covers the entire spectrum of possible requirements for monitored and non-monitored photoeyes, simplifying inventory management and product training.


The IRB-RET is an external entrapment protection device type B1, non-contact sensor for use with automatic gates and doors. The device is a UL325-2018 recognized component suitable for use with both operators that require monitored entrapment protection and those that do not require monitored operation.


There are five monitoring interfaces:


1. Normally closed: Cycle power to the transmitter while monitoring the receiver contacts for proper operation.
2. Two-wire pulsed (2 freq): Provides 300Hz “heartbeat” unobstructed, 0Hz obstructed over power supply lines.
3. Three-wire pulsed (3 freq): Provides 300Hz “heartbeat” unobstructed, 2Hz obstructed and 0Hz failure over power supply lines.
4. Four-wire pulsed: Provides 300Hz “heartbeat” unobstructed, 0Hz obstructed over separate connection
5. Resistive termination: Provides a 10k Ohm resistance when unobstructed.


The long range and thru-beam features combined with the installer mode switch settings provide a flexible solution to all external entrapment protection needs. A robust, NEMA 4X enclosure provides the durability required for high-reliability entrapment protection applications. Lens-less design minimizes fogging and false triggering caused by small objects and provides for easy alignment.
Technical Data
Operating range: Up to 60 ft. (18.3m)
Sensitivity adjustment: Potentiometer
Power indicator: Green LED
Detect indicator: Red LED
Mode selection switch: 3 modes, relay output, pulsed (3 frequency), pulsed (2 frequency)
Pulse Output: 2 wire/4wire
Relay output operation: Light on/dark on selection
Relay output: Form C contacts (NO, COM, NC)
Resistive termination: 10k Ohm across NO contact
Power Protection: Thermal fuse
Transmitter power cycle: >300mS (for use in configuration 0 Monitored)
Power supply: 6…35 VDC, 12…24VAC (configuration 0-relay only)
Current (config. 1 and 2): 15mA (12VDC, includes TX and RX wired in parallel)
Current (config. 0): 60mA (relay activated)
Operating temperature: -40°F…170°F (-40°C…77°C)
Environmental: NEMA 4X
Dimensions (L x W x H): 3.1”W 2.7”D 6.6”H
Weight: TX – 0.7 lbs
Connections: 7 terminal
Competitive Advantage
The major advantage of the IRB-MON is its flexibility; this photo eye covers the whole spectrum of UL situations.

• Non-monitored UL325 2018 compliance for the gate operators.
• Monitored application per UL325-2010 as applied to overhead doors operators.
• Non-UL installation.
Only one photo eye is needed to cover all these applications.



UL 325  2018 NEMA 4X

The IRB-RET is a monitored, weather-proof retroreflective photoeye solution providing entrapment protection for automatic gates and doors. Retroreflective configuration eliminates the need for a separate transmitter and the associated wiring across a roadway to reduce installation costs. The IRB-RET is UL 325-2018 compliant and housed in a rugged NEMA 4X enclosure suitable for indoor and outdoor use.

The universal design of the IRB-RET allows it to be used with a wide variety of monitored operators. Additionally, it is compatible with most non-monitored legacy products.


Benefits include:

Selectable monitoring interface for easy set-up and installation

Compatible with many operators

Long operating range

Robust design minimizes fogging and false triggering to provide easy alignment

Mounting bracket and reflector provided

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ETL Listed gate operator product.
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