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    SECO-LARM Enforcer E-931-S33PRQ Photoelectric Sensor Installation Manual

    September 08, 2026 3 min read

    Installation manual for the SECO-LARM ENFORCER E-931-S33PRQ Polarized Retro-Reflective Photoelectric Sensor, 33ft range.

    💾 Download Original PDF
    Full text manual (for reference)

    Installation manual for the SECO-LARM ENFORCER E-931-S33PRQ Polarized Retro-Reflective Photoelectric Sensor — a 33ft. (10m) range weatherproof beam sensor for gates, garage doors, sliding doors, and industrial automation.

    Features

    • Polarized sensor immune to shiny objects — triggers only when correctly reflected light is detected
    • Weatherproof (IP66) design with cable gasket for indoor/outdoor use
    • Anti-condensation case
    • Dark ON operation
    • Round reflector, 80mm diameter
    • Input voltage: 12–250 VDC/VAC
    • Form "C" relay, 2A @ 30VDC
    • LED alignment system
    • Tamper switch: N.C., 500mA @ 30VDC

    Includes: Reflector, sensor, sensor mounting plate, weather-resistant gasket, sensor hood.

    Typical Applications

    • Safety sensor for garage doors, outdoor gates, or sliding doors
    • Overhead door security sensor
    • Industrial automation — detecting small objects on a manufacturing line
    • Assisting in measuring parking distance
    • Alarm sensor for windows, terraces, parking lots, etc.

    Wiring

    Removable terminal blocks, 7 positions: AC/DC (12~250V, non-polarity), NC, NO, COM, TP1, TP2 (tamper switch, N.C. 500mA @ 30VDC).

    Mounting the Sensor

    1. Unscrew the 4 screws and remove the cover.
    2. Loosen the captive screw to free the sensor from the mounting plate.
    3. Using the included screws, mount the mounting plate to the wall.
    4. If wires come from inside the wall, use the breakout and rubber gasket on the back of the sensor to run the wires. Otherwise, use the breakout and cable gland at the bottom of the sensor.
    5. Remove the terminal block using long-nose pliers and wire the unit per the wiring diagram.
    6. Hang the sensor back onto the plate and secure with the captive screw.
    7. Re-attach the cover with the included small screws.
    8. Attach the hood to the top of the sensor.

    Installation and Adjustment

    Dual-Color LED Functions

    • Red LED ON — sensor is triggered
    • Green LED ON — sensor is properly aligned with the reflector and not triggered
    • LED alternately flashes red/green — beam signal is weak (not triggered)

    Installation Steps

    1. Mount the reflector and sensor so they face each other.
    2. Connect power to the sensor. The red LED typically turns ON, indicating misalignment; if the green LED is ON (red OFF), sensor and reflector are aligned (fine adjustment may still be needed).
    3. Slowly turn the lens assembly left and right, and use the vertical adjustment screw to tilt the sensor up and down. Correct alignment is reached when the red LED turns OFF and the green LED turns ON. If the LED alternately flashes green and red, the sensor is at the edge of the signal range and may not work reliably.
    4. Put the object to be detected between the sensor and reflector. The green LED should turn OFF and the red LED should turn ON.

    Adjustment range: Horizontal ±90°, Vertical ±5°.

    Testing

    1. Power up the sensor. The green LED should be ON; the red LED should be OFF.
    2. Pass the object to be detected between the sensor and reflector. The red LED should turn ON and the green LED should turn OFF, confirming detection.

    Troubleshooting

    Trouble Possible Cause(s) Remedy
    Sensor does not detect the object Sensitivity not properly set; object may have a reflective surface confusing the sensor Change the angle of the sensor or readjust the sensitivity setting
    Green LED does not turn on Dirty sensor/reflector; misalignment Clean with a damp (not wet) cloth; adjust for proper alignment
    Red LED lights when object detected, but no output No continuity between sensor and alarm device Check the cable from sensor to alarm device; test sensor

    Specifications

    Sensing range 0.5' to 33' (0.1–10m)
    Voltage supply 12–250 VAC/DC
    Current drain (max.) 12VDC: 20mA standby / 40mA active; 24VDC: 10mA standby / 20mA active
    Response time 10ms max.
    Tx LED element Infrared, 740nm
    Trigger output SPDT relay, 1A @ 125VAC, 2A @ 30VDC
    Tamper switch N.C., 500mA @ 30VAC
    Enclosure IP66 weatherproof
    Ambient temperature -40°F to 131°F (-20°C to 55°C)

    Caution

    This sensor was not designed to prevent bodily injury or loss of life, and was not designed for use in environments with explosive gasses. Use of this sensor in certain security applications may be regulated by local laws or codes — SECO-LARM is not responsible for compliance with such laws or codes.

    Limited Warranty

    Warranted against defects in material and workmanship for one (1) year from date of sale to the original consumer customer. SECO-LARM's obligation is limited to repair or replacement of any defective part if the unit is returned, transportation prepaid. Void if damage is caused by misuse, abuse, neglect, unauthorized repair/alteration, or improper installation. No liability for special, collateral, incidental, or consequential damages.