Optex SL-650QDP(C)
Optex SL-650QDP Quad Beam Sensor Instruction Manual
Comprehensive guide for installation, operation, and maintenance of your Optex SL-650QDP sensor.
1. Product Overview
The Optex SL-650QDP is an advanced quad beam sensor designed for reliable outdoor and indoor perimeter security. It utilizes multiple frequencies to minimize false alarms and offers a detection range of up to 650 feet outdoors and 1300 feet indoors. This manual provides essential information for the proper installation, configuration, and maintenance of the device.

Figure 1.1: Optex SL-650QDP Quad Beam Sensor. This image shows the complete external view of the sensor unit, highlighting its sleek, weather-resistant design suitable for both indoor and outdoor installations.
2. Safety Information
Please read all safety instructions carefully before installation and operation. Failure to follow these instructions may result in injury, damage to the product, or voiding the warranty.
- Ensure power is disconnected before performing any installation or maintenance.
- Installation should be performed by qualified personnel in accordance with local electrical codes.
- Do not expose the unit to excessive moisture or extreme temperatures beyond its specified operating range.
- Use only specified power supplies and accessories.
- Avoid direct exposure of the sensor's optical components to strong light sources, which may affect performance.
3. Package Contents
Verify that all components are present in the package:
- Optex SL-650QDP Transmitter Unit
- Optex SL-650QDP Receiver Unit
- Mounting Brackets and Hardware
- Alignment Tools (if included)
- Instruction Manual (this document)
4. Setup and Installation
Proper installation is critical for optimal performance of the SL-650QDP sensor.
4.1 Site Selection
- Choose a location free from obstructions between the transmitter and receiver units.
- Avoid direct sunlight or strong artificial light sources shining directly into the sensor's lenses.
- Mount units on stable, vibration-free surfaces.
4.2 Mounting the Units
Mount the transmitter and receiver units facing each other, ensuring they are at the same height and parallel to each other. The maximum distance is 650 feet (outdoor) or 1300 feet (indoor).
- Open the sensor casing by removing the front cover.
- Secure the mounting brackets to the desired surface using appropriate screws and anchors.
- Attach the sensor units to the mounting brackets.
- Ensure the units are plumb and level.

Figure 4.1: Internal view of the Optex SL-650QDP sensor. This image displays the internal components, including the optical alignment mechanism and wiring terminals, which are crucial for proper installation and configuration.
4.3 Wiring and Connections
Connect power and alarm outputs according to the wiring diagram provided inside the unit's casing or in the full technical manual. Typically, 12-24V DC power is required.
- Connect power to the designated terminals (e.g., +V and -V).
- Connect alarm output terminals (e.g., NO/NC and Common) to your alarm control panel.
- Ensure all connections are secure and insulated.
4.4 Beam Alignment
Accurate beam alignment is essential for reliable operation. The SL-650QDP features an optical alignment system.
- Power on both transmitter and receiver units.
- Use the built-in viewfinder or alignment LEDs/meter on the receiver unit to precisely align the transmitter's beams.
- Adjust the horizontal and vertical alignment screws until the alignment indicator shows maximum signal strength.
- Secure all adjustment screws once alignment is complete.
5. Operating Instructions
Once installed and aligned, the Optex SL-650QDP operates automatically.
- Normal Operation: When the beams are unobstructed, the alarm output remains in its normal state (e.g., Normally Closed circuit is closed).
- Alarm Condition: If any of the four beams are simultaneously interrupted for a preset duration (typically adjustable), the receiver unit will trigger the alarm output, signaling an intrusion.
- Frequency Selection: The SL-650QDP allows for multiple frequency channels to prevent interference when multiple beam sets are installed in close proximity. Refer to the unit's internal dip switches for frequency selection.
6. Maintenance
Regular maintenance ensures the long-term reliability and performance of your sensor.
- Cleaning: Periodically clean the optical lenses of both transmitter and receiver units using a soft, lint-free cloth and a mild cleaning solution (e.g., lens cleaner). Dust, dirt, spiderwebs, or snow can obstruct the beams.
- Alignment Check: Annually, or after severe weather conditions, verify the beam alignment using the built-in alignment indicators. Re-align if necessary.
- Physical Inspection: Check for any physical damage to the casing, mounting brackets, or wiring. Ensure all screws are tight.
- Vegetation Control: Trim any vegetation that may grow into the beam path.
7. Troubleshooting
If you experience issues with your SL-650QDP sensor, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| False Alarms | Misalignment, strong sunlight, spiderwebs/debris on lens, swaying vegetation, interference from other sensors. | Re-align beams, clean lenses, trim vegetation, change frequency channel, install sun shields. |
| No Alarm Trigger | Power issue, wiring error, complete beam obstruction, faulty unit. | Check power supply, verify wiring connections, clear beam path, test unit functionality. |
| Alignment Difficulties | Units not level/plumb, excessive distance, severe weather conditions. | Ensure units are perfectly level and plumb, check distance against specifications, wait for clear weather. |
If the problem persists after attempting these solutions, please contact Optex technical support.
8. Specifications
Key technical specifications for the Optex SL-650QDP:
- Model Number: SL-650QDP(C)
- Detection Method: Quad Infrared Beam
- Max. Outdoor Range: 650 feet (200 meters)
- Max. Indoor Range: 1300 feet (400 meters)
- Power Supply: 10.5 - 30V DC
- Current Consumption: Transmitter: 38mA, Receiver: 43mA (typical)
- Alarm Output: Form C relay (NO/NC), 30V AC/DC, 0.5A max.
- Response Time: 50ms to 700ms (adjustable)
- Operating Temperature: -35°C to +60°C (-31°F to +140°F)
- Environmental Protection: IP65 (Dust and water jet resistant)
- Weight: Approximately 1.1 pounds (0.5 kg) per unit
9. Warranty and Support
The Optex SL-650QDP sensor is manufactured by Optex. For specific warranty details, please refer to the warranty card included with your product or visit the official Optex website. For technical support, troubleshooting assistance beyond this manual, or replacement parts, please contact Optex customer service directly.
Manufacturer: Optex
Date First Available: March 16, 2015
For the most up-to-date contact information, please visit Optex America's official website.
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