SECO-LARM Enforcer E-931-S35RRQ 35Ft Reflective Photoelectric Beam Sensor
The SECO-LARM Enforcer E-931-S35RRQ is a compact retro-reflective photoelectric beam sensor for detecting vehicles, people, carts, or other objects passing between the sensor and reflector. In a gate or garage installation, the sensor is commonly wired into an open, close, safety, notification, or auxiliary input depending on how the controller is designed. Because the unit reflects the infrared beam back from the included reflector, it can be easier to install than a transmitter/receiver beam pair in some driveway or door openings.
This sensor is often used on outdoor gates, garage doors, overhead doors, access-control lanes, parking areas, loading areas, storefront notification systems, and light industrial automation. Correct mounting height, clean reflector alignment, solid brackets, and proper wiring are what make the difference between a reliable installation and nuisance trips. The E-931-S35RRQ includes status LEDs that help with alignment and trigger diagnosis, but the final behavior depends on the connected gate operator or control panel input.
Compatible With
Commonly used with select gate operators, garage door controls, overhead door controls, access-control panels, alarm panels, annunciators, parking systems, and automation inputs that accept a dry contact relay from a photoelectric sensor. Suitable applications include outdoor gate detection, garage door object detection, entry notification, industrial object detection, parking distance indication, and alarm notification. Verify whether the connected controller requires a normally open, normally closed, fail-safe, fail-secure, monitored, or non-monitored input.
Features & Specifications
| Manufacturer | SECO-LARM / ENFORCER |
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| Product Type | Retro-reflective photoelectric beam sensor |
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| Part Number | E-931-S35RRQ |
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| Application | Object detection for gates, doors, parking, notification, and automation |
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| Sensing Range | Up to 35 ft when properly aligned |
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| Voltage | 12-240 VDC or 24-240 VAC |
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| Output | SPDT relay output with NO/NC/COM contacts |
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| Weather Rating | Indoor/outdoor weather-resistant housing; commonly listed as IP66 |
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| Included Components | Sensor, reflector, brackets, and mounting hardware |
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| Notes | Reflector alignment and controller input type must be verified |
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Also Known As / Related Part Numbers
- E-931-S35RRQ
- E931S35RRQ
- E-931-S35RR
- ENFORCER E-931-S35RRQ
- SECO-LARM E-931-S35RRQ
- 35 ft reflective photo eye
- retro-reflective photoelectric beam sensor
Technician Note
Do not assume this sensor satisfies monitored gate entrapment protection requirements on every operator. Some modern gate operators require monitored photo eyes with a specific model, resistance, pulse, or supervision method. Use this sensor only where the controller and code requirements allow it.
Before Ordering Checklist
- Confirm the required sensing range and reflector mounting surface.
- Confirm the controller accepts a relay-style photoelectric sensor.
- Check whether the input must be NO, NC, fail-safe, fail-secure, or monitored.
- Make sure the reflector can be kept clean and protected from physical damage.
- For gate safety use, verify the operator manual and local code requirements before wiring.
Professional Advisory
Access-control and gate wiring should be performed with the power disconnected and with the system wired according to the operator, lock, or access-control manual. Do not bypass required safety devices. For high-voltage circuits, delayed egress code requirements, or unsafe gate movement, use a qualified gate or access-control technician.
Product Questions
Is the E-931-S35RRQ a through-beam photo eye?
No. It is a retro-reflective sensor that uses one powered sensor and a reflector across the opening.
Can this be used on a gate operator?
Yes, it is commonly used with gate and garage controls that accept a compatible relay contact, but the operator input requirements must be checked first.
Why does alignment matter on this sensor?
The sensor must receive the reflected beam. A loose reflector, dirty lens, vibration, or poor angle can cause false triggers or missed detection.
Is this a monitored UL 325 safety photo eye?
Do not assume it is monitored. Many current gate operators require specific monitored safety devices, so verify the operator manual.
What voltage can power this sensor?
It is commonly listed for a broad input range of 12-240 VDC or 24-240 VAC, making it adaptable to many control systems.
