Product Overview
The E-931-S50RRQ is a legacy-style SECO-LARM Enforcer reflective beam sensor for 50 ft detection runs. It is used when a single sensor head and reflector are mounted across an opening or lane and the connected device needs a dry-contact signal when the beam is interrupted. In gate and door work, this type of sensor may be used for vehicle approach detection, auxiliary input notification, alarm triggering, or older non-monitored photoeye circuits depending on the operator and local requirements. Fitment should be checked closely because SECO-LARM has multiple 50 ft reflective photoeye part numbers. The E-931-S50RRGQ is a related current monitored/ETL UL325-style product, while the E-931-S50RRLQ is a larger reflective sensor with a wider voltage range. Verify before substituting.
Compatible With
- Older SECO-LARM E-931-S50RRQ reflective beam sensor installations
- Gate, garage door, alarm, driveway, and automation circuits accepting SPDT relay output
- 50 ft sensor-to-reflector detection applications
- Related SECO-LARM 50 ft reflective models: E-931-S50RRGQ, E-931-S50RRLQ; verify before substituting
- Related reflector/hood accessories such as E-931ACC-RC1Q and E-931ACC-HR1Q where physically compatible
- Not guaranteed for monitored UL 325 gate safety replacement unless operator monitoring method is confirmed
Features & Specifications
| Manufacturer | SECO-LARM |
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| Product Type | Reflective photoelectric beam sensor |
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| Part Number | E-931-S50RRQ |
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| Application | Reflective object detection for gates, doors, alarms, and automation |
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| Sensing Range | Up to 50 ft / 15 m |
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| Supply Voltage | 12~250 VAC/VDC in legacy product references |
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| Output | SPDT relay output, NO/NC/COM |
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| Response Time | 10 ms max in common legacy specifications |
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| Enclosure | IP66 waterproof in legacy listing references |
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| Notes | Legacy part; compare with E-931-S50RRGQ or E-931-S50RRLQ before substituting |
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Also Known As / Related Part Numbers
- E-931-S50RRQ
- E931S50RRQ
- E-931-S50RR
- SECO-LARM E-931-S50RRQ
- Enforcer E-931-S50RRQ
- 50 ft reflective photoelectric beam sensor
- E-931-S50RRGQ related current 50 ft monitored sensor
- E-931-S50RRLQ related large 50 ft sensor
- E-931ACC-RC1Q reflector
- E-931ACC-HR1Q reflector hood
Technician Note
For older gate operators, match the original relay wiring and sensor voltage. For newer monitored gate operators, verify whether the operator requires a monitored 10k ohm or NC monitored output before replacing the photoeye.
Before Ordering Checklist
- Confirm whether the original part number is E-931-S50RRQ.
- Check available voltage and relay wiring.
- Verify monitoring requirements for gate safety circuits.
- Measure the sensor-to-reflector distance and mounting space.
- Compare reflector and hood style if replacing only part of an existing setup.
Important Ordering Warnings
Professional Advisory
Gate operators with monitored entrapment protection should only be serviced with compatible safety devices. Do not bypass a failed photoeye to keep a gate running.
Product Questions
Is E-931-S50RRQ the same as E-931-S50RRGQ?
No. They are related 50 ft SECO-LARM reflective sensors, but E-931-S50RRGQ has current monitored/ETL UL325-style references. Verify the exact application before substituting.
Can this sensor be used outdoors?
Legacy listings commonly reference an outdoor-rated enclosure. Always mount and seal wiring according to the installation manual and site exposure.
What does the reflector do?
The reflector returns the infrared beam back to the sensor. If the beam is blocked or alignment is poor, the output changes state.
Can this replace a gate photoeye?
Only if the operator input, voltage, relay wiring, and safety monitoring requirements match. Many modern operators require monitored safety devices.
What are common replacement symptoms?
Frequent false triggers, no alignment LED, damaged housing, water intrusion, broken reflector, or a relay that does not change state can point to sensor or alignment problems.
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