Seco-Larm E-931-S35RRQ Photoelectric Sensor, 35 ft

Retro-Reflective Beam Sensor for Gate, Door, and Entry Detection

The SECO-LARM E-931-S35RRQ is a retro-reflective photoelectric beam sensor from the ENFORCER line, designed to detect any object that breaks the infrared beam between the sensor unit and its included square reflector. In gate and access control applications, the sensor mounts on one side of the opening while the reflector mounts on the opposite side; when a vehicle, pedestrian, or object interrupts the beam, the onboard SPDT relay output triggers the connected device, whether a gate operator control board, garage door opener, alarm panel, or entry notification system. The sensor operates across a wide voltage range spanning 12–240 VDC and 24–240 VAC, non-polarized, which makes it compatible with most gate control boards and access panels without requiring a dedicated power supply.

The sensing range is field-adjustable from 0.5 to 35 ft, allowing the installer to dial in detection sensitivity for the specific object type and environment. A yellow LED confirms proper alignment with the reflector; a red LED confirms a triggered state. IP66-rated weatherproof construction supports permanent outdoor installation at entry gates, driveways, and covered parking areas as well as indoor use on assembly lines, store entrances, and garage doors. The sensor ships pre-wired with a 6 ft cord, and the maximum cable extension length is 325 ft, accommodating wide gate openings and long conduit runs. Mounting brackets and all hardware for both the sensor and reflector are included.

Key Features

• Retro-reflective design detects object intrusion between sensor and included square reflector, requiring only one wired unit per installation point
• Wide operating voltage (12–240 VDC / 24–240 VAC, non-polarized) integrates with the majority of gate operator control boards without an added power supply
• Adjustable sensing range from 0.5 to 35 ft allows calibration for vehicle detection, pedestrian detection, or proximity monitoring at various distances
• SPDT relay output (NO/NC/COM) connects directly to gate operators, access panels, and alarm devices
• IP66-rated weatherproof housing rated for permanent indoor and outdoor installation
• Yellow LED confirms active beam alignment; red LED confirms triggered state for field diagnostics during installation and troubleshooting
• Pre-wired 6 ft cord; cable can be extended up to 325 ft for wide openings and long conduit runs
• Mounting brackets and hardware included for both sensor and reflector

Technical Specifications

• Part Number: E-931-S35RRQ
• Type: Retro-reflective photoelectric beam sensor
• Operating Voltage: 24–240 VAC / 12–240 VDC (non-polarized)
• Sensing Range: 0.5–35 ft (0.2–11 m), adjustable
• Response Time: 10 ms (max.)
• Light Source: IR LED
• LED Indicators: Yellow (aligned, not triggered); Red (triggered)
• Trigger Output: SPDT relay (NO/NC/COM)
• Switching Capacity: 1A@250VAC / 2A@30VDC
• Current Draw: 25 mA standby / 60 mA active @ 12 VDC
• IP Rating: IP66 Weatherproof
• Operating Temperature: -4 to 131°F (-20 to 55°C)
• Sensor Dimensions: 13/16" x 2-5/8" x 1-9/16" (20 x 66 x 40 mm)
• Reflector Dimensions: 2-1/16" x 2-1/2" x 3/8" (53 x 63 x 10 mm)
• Cable: 6 ft x ø1/4" (1.8 m x ø6 mm); max. extension 325 ft (100 m)
• Included: Sensor, square reflector, sensor mounting bracket, reflector mounting bracket (E-931ACC-BLR2Q), all mounting hardware, manual
• Warranty: 1 year
• Manufacturer: SECO-LARM U.S.A., Inc.
• Condition: New

Conclusion

The E-931-S35RRQ connects to any device accepting a dry-contact relay input, including gate operator control boards from LiftMaster, DoorKing, Linear, All-O-Matic, and others. For installations where the reflector mounting angle requires additional adjustment flexibility, SECO-LARM offers optional accessories including a round reflector (E-931ACC-RC1Q), reflector hood (E-931ACC-HR1Q), wall bracket (E-931ACC-BLS7Q), door frame bracket (E-931ACC-BLS8Q), and single-gang flush-mount bracket (E-931ACC-BLS6Q). Avoid positioning the sensor where highly reflective surfaces, such as chrome or reflective tape, may fall near the beam path, as this can interfere with consistent detection at certain sensitivity settings.