The IRB-MON2 is a universal, UL325-compliant monitored thru-beam photoeye kit for gate and door automation. With four monitoring protocols and an LED alignment indicator, the kit provides reliable entrapment protection, also suited to upgrading existing installations.
Model: IRB-MON2
Type: Thru-beam infrared photoeye kit, monitored (transmitter + receiver)
Standard: UL325 compliant, Type B1 entrapment protection
Monitoring interfaces: normally closed, 10K resistive, two-wire pulse (2- and 3-frequency)
Range: up to 35 m
Power supply: 6-35 VDC or 12-24 VAC
Alignment indicator: green LED on receiver
Housing: IP65, suitable for indoor and outdoor use
Compatibility: also suits non-monitored, legacy systems (NC/NO)
Application: gates, doors and barriers requiring UL325 compliance
At gate and door automation where a monitored safety device is required, such as projects that need to comply with the UL325 safety standard, a standard photoeye isn't enough. A monitored system needs to not just detect an obstruction, but continuously check its own operation and actively signal a fault, so a failed sensor doesn't go unnoticed. The IRB-MON2 is built to meet exactly this requirement.
The IRB-MON2 supports four different monitoring interfaces: normally closed, 10K resistive termination, and two-wire pulse on both two- and three-frequency bases. That versatility means the photoeye is compatible with a wide range of gate and door controllers requiring monitored external safety devices, without needing a separate product for each brand of controller.
Like the non-monitored IRB-4X2, the IRB-MON2 works on the thru-beam principle, with transmitter and receiver mounted opposite each other, and an operating range up to 35 metres. A green LED alignment indicator on the receiver shows status during installation, considerably simplifying alignment and verifying a correct setup.
Beyond monitored operation, the IRB-MON2 is also compatible with most non-monitored, older systems that use standard NC/NO contacts. That makes the photoeye a practical choice for renovation projects where an existing, non-monitored installation may be upgraded to a monitored configuration in the future, without needing to replace the photoeye itself.
The housing is IP65 rated and suited to both indoor and outdoor applications. The robust construction limits fogging and false triggering, contributing to easier alignment and less maintenance over the installation's lifetime.
The difference between a non-monitored photoeye and the IRB-MON2 isn't in the basic detection function, but in what happens if the sensor itself fails. In a non-monitored system, a failed photoeye can go unnoticed, risking a door or gate closing without actually detecting an obstruction. In a monitored system like the IRB-MON2, that kind of fault is actively reported back to the controller, which can respond by preventing the door from closing.
The IRB-MON2 is used at any gate or door automation where UL325-compliant, monitored protection is required, such as commercial barriers, industrial gates, and publicly accessible access roads where a higher safety level is needed than with a regular, non-monitored application.
Secumatic supplies the IRB-MON2 as part of the complete vehicle detection and safety sensor range, with support on specification and project advice for installers and technical service providers. Get in touch for advice on the right photoeye for your project.
