GJD300 D-TECT 2 External Quad PIR Detector, Programmable 30 m Range

Introduction to the GJD300 D-TECT 2 External Quad PIR Detector

The GJD300 (D-TECT 2) is a purpose-built outdoor quad-element passive infrared (PIR) motion detector designed for perimeter and external security applications. With programmable detection beams that reach up to 30 m, adjustable pan and tilt aiming, a robust zinc-alloy housing and multiple outputs for integration, the GJD300 is positioned as a reliable trigger device for alarm systems, CCTV and external lighting control. The manufacturer states BS-8418 capability, making this product suitable for professionally installed perimeter systems where standards compliance is required. Suggested price guidance for the unit is 185.00 (manufacturer/seller pricing may vary).

• Quad-element PIR sensorfor increased false alarm immunity compared with simpler PIR designs.
• Programmable detection range up to 30 mwith adjustable beam shaping to suit the site layout.
• Pan and tilt aiming(approximately 1806 pan and 906 tilt) for precise alignment of detection zones.
• Multiple outputs: 2 volt-free contacts, 2 negative switched outputs and front/rear tamper reporting for alarm panel and CCTV integration.
• Installer-friendly fitments: masking curtains/tape for lens zone management, walk/test LED, optional programming fob and conduit cable adaptor.
• Rugged construction: zinc-alloy metal housing with conformally coated electronics and IP-rated variants for harsh environments.

Detailed specifications and benefits

Understanding the GJD300s technical specifications clarifies where it delivers value and why it is chosen for perimeter installations. Below are the core specifications and the practical benefits each brings to a security installation.

• Model:GJD300 (D-TECT 2)Benefit: A dedicated model name simplifies specifying and sourcing the correct detector for external perimeter projects.
• Sensor:Quad-element passive infrared (PIR)Benefit: Quad elements improve discrimination between valid intruder movement and many common nuisance sources such as small animals, moving vegetation and rapid temperature changes.
• Detection range:Programmable up to 30 mBenefit: Long-range beams provide early detection and greater advance warning in large perimeters; programmable beam lengths let installers adapt coverage to the environment and reduce unwanted triggers.
• Coverage angle:Typically 1060606 (max coverage approx. 30 m )Benefit: Narrow beam options concentrate detection into specific lanes or approaches, while wider settings create broader coverage where needed.
• Pan / Tilt:Pan approximately 1806; Tilt approximately 906Benefit: Broad mechanical adjustment simplifies accurate alignment of beams to the protected approach without requiring complex mounting solutions.
• Outputs:2 volt-free + 2 negative switched + tamperBenefit: Flexible wiring options for alarm panels, CCTV inputs and lighting controllers. The tamper contacts help preserve system integrity and detect enclosure interference.
• Power input & current:Common listings 99 9 24 V AC/DC (variant dependent); some listings 9 9 9 15 V DC)Benefit: Flexibility to fit a range of power infrastructures; installers should confirm the variant when ordering and verify wiring in the datasheet.
• Typical current:Approximately 9 11 mA at 12 V nominalBenefit: Low current draw suits battery-backed or low-power systems and helps when multiple devices share the same supply.
• Walk test:LED walk/test output and optional programming fobBenefit: Simplifies commissioning by giving visual confirmation of coverage during setup, and remote programming reduces time on ladders or repeated adjustments.
• Fresnel lens zones:28 zones (per pyro pair) with masking curtains/tapeBenefit: Fine-grained masking allows the installer to shape detection to avoid windows, roads or other non-threat areas.
• Mounting height:Up to 6 m (optimum approx. 3 m)Benefit: Suitable for wall or post mounts; the typical 3 m position balances field of view and detection reliability.
• Housing and protection:Zinc-alloy metal housing, conformally coated electronics; IP55/IP65 listings depending on variantBenefit: Metal enclosure improves vandal resistance and heat dissipation; conformal coating enhances reliability in humid or corrosive environments. Check the specific variants IP rating for full weatherproof suitability.
• Operating temperature:Approximately approx. -206C to +556CBenefit: Wide operating range covers most outdoor climates encountered in temperate regions.
• Dimensions:145 x 120 x 115 mmBenefit: Compact enough for discreet installation but substantial enough to house robust electronics and connectors.
• Standards:Manufacturer-stated BS-8418 capabilityBenefit: Indicates suitability for professional perimeter intrusion detection systems; installers should consult the datasheet and compliance documentation for specific project requirements.

Use cases and scenarios where the GJD300 excels

• Commercial perimeter protection:Large warehouses, industrial yards and distribution centres benefit from the long-range programmable beams and tamper outputs that integrate with existing alarms and monitoring systems.
• CCTV triggering and camera cueing:The detectors electrical outputs provide reliable contact inputs to CCTV recorders and PTZ cueing systems so cameras capture intruder approach before an incident escalates.
• External lighting control:Use the detector to switch security lighting or activate floodlighting only when movement is detected, saving energy while improving visibility during incidents.
• Perimeter lane protection:Narrow, long beams and precise aiming allow the GJD300 to protect driveways, access roads and fence lines where you want detection in a specific corridor rather than general motion sensing.
• High-risk or remote sites:Its rugged metal housing and conformal coating make the unit appropriate for exposed or remote locations where equipment must tolerate harsh weather and vandalism attempts.

Comparisons with similar products on the market

When evaluating the GJD300 against other external motion detection options, consider these practical comparisons rather than brand-to-brand feature lists:

• Quad-element PIR vs dual-element PIR:Quad-element sensors typically offer better false alarm rejection and zone discrimination than dual-element alternatives. That makes the GJD300 a stronger choice where nuisance alarms (animals, bushes, headlights) are a problem.
• PIR-only vs dual-tech (PIR + microwave):Dual-tech sensors use two independent technologies and require both to trigger before an alarm, reducing false alarms further in some scenarios. However, dual-tech detectors can be prone to environmental interference (e.g., foliage movement affecting microwave signals) and usually cost more. The GJD300s beam programmability and masking make PIR-only quad designs very effective in many outdoor perimeter roles without the complexity of microwave tuning.
• Point detectors vs barrier/beam systems:Barrier (active infrared) beams are excellent for precise fence-line detection but have no intrinsic false alarm filtering and can be defeated by occlusion. Quad-PIR units like the GJD300 offer broader coverage with intelligent zone shaping and are often easier to install on uneven terrain or complex site geometries.
• Camera analytics vs hardware-based detection:Video analytics can add rich identification and classification but require reliable image quality, lighting and can add processing complexity. The GJD300s hardware-based detection is low-latency, power-efficient and works in darkness when paired with lighting or thermal cameras, making it a reliable trigger source for camera systems.
• Cost and lifecycle:While not the cheapest external PIR on the market, the GJD300s robust housing and professional features often reduce maintenance and replacement costs over time compared with lower-cost plastic-enclosed detectors.

Customer testimonials and installer feedback

There are no direct, attributable customer testimonials included here. However, common installer and integrator feedback for quad-element, long-range external PIR detectors such as the GJD300 typically highlights the following points:

• Pros:Strong false alarm immunity in cluttered outdoor sites; ease of alignment with pan/tilt adjustments; reliable CCTV-trigger performance; durable metal housing that resists vandalism and corrosion.
• Considerations:Slightly higher upfront cost than basic PIR sensors; installers must confirm the correct power variant and IP rating for the site; commissioning and masking during setup are important to achieve the best nuisance rejection.
• Practical tip from installers:Use the walk/test LED and temporary masking during setup to verify beam edges and adjust aim before finalising cable runs and sealing the enclosure.

Conclusion

The GJD300 D-TECT 2 is a focused, professional-grade external motion detector that combines long-range programmable PIR beams, precise mechanical aiming, flexible outputs and a rugged housing to meet the needs of perimeter security, CCTV trigger systems and external lighting control. Its quad-element sensor design and masking options help reduce false alarms while its multiple outputs and tamper monitoring make it straightforward to integrate into established alarm and monitoring infrastructures. For projects that demand reliable detection at distances up to 30 m and a durable fit-and-forget installation, the GJD300 represents a strong choice. As with any security hardware, successful performance depends on correct variant selection, careful siting and professional installation in accordance with the manufacturers datasheet and local standards such as BS-8418 where applicable.