Introduction to the GJD D-TECT 3 (GJD310) and its key features
GJD D-TECT 3 (GJD310)is a wired triple-technology external motion detector designed for perimeter and external intruder detection. Combining a quad-element passive infrared (PIR) module with a microwave sensor and advanced optics and signal processing, it delivers reliable detection out to a programmable 30 m range while actively reducing false alarms. Housed in a robust zinc-alloy enclosure and offering multiple outputs for alarm panels, cameras and lighting controllers, the D-TECT 3 is pitched at installers and security professionals who need a dependable outdoor detection solution.
Detailed description of specifications and benefits
The D-TECT 3 packs a number of practical features that make it well-suited to challenging outdoor environments. At the heart of the unit is a quad-element PIR arrangement that provides fine-grained thermal detection zones, paired with a microwave sensor. This triple-tech approach helps ensure that an alarm is triggered only when multiple sensing elements indicate a genuine intrusion, rather than by a single spurious event such as a gust of wind, small animal, or sudden light changes.
Key specifications and the benefits they deliver:
- Detection technology:Quad-element PIR + microwave (triple-tech). This combination improves detection reliability and markedly reduces false alarms compared with single-tech sensors.
- Programmable range:Up to 30 m (coverage roughly 30 m × 30 m). Installers can tune the range for the site to avoid over-reaching detection or dead zones.
- Adjustment and alignment:Pan (~180°) and tilt (~90°) optics allow precise aiming of the detection field to fit walls, fences and hedges, limiting unwanted triggers from traffic or passers-by.
- Selectable pulse count & timer:Pulse count selectable 1–3 and timers selectable from 2–60 seconds. These settings enable sensitivity and alarm persistence to be tailored to operational needs.
- Engineer-friendly features:Walk-test LEDs for microwave, PIR and alarm, plus EOL resistor selection (1k, 2K2, 3K3, 4K7, 5K6, 6K8). These features speed up commissioning and make integration with alarm panels straightforward.
- Multiple outputs:Two volt-free and two negative-switched outputs plus a common tamper contact. This provides flexible interfacing options for control panels, cameras and lighting systems.
- Robust construction:Zinc-alloy metal housing with front and rear tamper switches and conformally coated electronics for better environmental resilience outdoors.
- Electrical:9–24 V AC/DC input range (check the datasheet for variants) and modest current draw (~11–15 mA at 12 V nominal), suitable for most alarm system auxiliary supplies.
Additionally, dusk/light trigger options allow the unit to be configured to operate only at low light levels, which is useful for integrating with lighting or CCTV systems that are intended to respond at night rather than during daytime activity.
- Reduced false alarms:The triple-tech detection logic and advanced signal processing dramatically reduce nuisance activations from wildlife, falling leaves, or rapid temperature changes.
- Flexible integration:Multiple output types and EOL resistor choices make the unit compatible with many alarm control panels and peripheral devices without extra adaptors.
- Durability:Metal housing and tamper switch protection increase vandal resistance and help the detector sustain weather exposure in perimeter roles.
- Installer efficiency:Walk-test LEDs and alignment adjustments reduce setup time and simplify fine-tuning during commissioning.
Use cases and scenarios where the D-TECT 3 excels
The GJD D-TECT 3 is engineered for outdoor perimeter protection scenarios where reliability and false alarm suppression are crucial. Typical use cases include:
- Commercial perimeter security:Warehouses, distribution centres and manufacturing sites benefit from long-range detection and tamper-resistant housings to protect fence lines, access points and compound perimeters.
- High-security domestic installations:Properties with extensive grounds or where passive detection needs to be discreet yet reliable—integrators can tune the device to avoid neighboring footfall or traffic.
- CCTV and lighting integration:Use the detector outputs to trigger PTZ camera presets, activate recording, or switch on floodlighting when an intrusion is detected at night—especially effective with the dusk/light trigger options.
- Critical infrastructure sites:Small substations, telecom sites, and similar facilities where directed long-range detection helps protect assets before intruders reach sensitive equipment.
- Perimeter hardening on mixed-terrain sites:Sloped, vegetated or partially sheltered perimeters where precise optical alignment and configurable sensitivity are needed to distinguish human intruders from environmental activity.
Because the unit is wired and designed for professional installation, it suits projects where a permanent, tamper-resistant detection layer is required rather than temporary or battery-powered sensors.
Comparisons with similar products in the market
When evaluating external motion detectors, it helps to compare by detection approach, housing durability, integration flexibility and commissioning features.
Single-tech PIR detectors:These rely only on PIR sensing and are often more affordable but are prone to false alarms in outdoor settings. The D-TECT 3’s triple-tech design provides a clear advantage in reliability where environmental factors are challenging.
Dual-tech (PIR + microwave) detectors:Dual-tech devices reduce false alarms compared to single-tech options, but the D-TECT 3’s quad-element PIR and refined optics give it more granularity in detection zones, improving target recognition at longer ranges.
Other external triple-tech alternatives:Some competing models also offer triple-technology sensing and rugged housings. The choice often boils down to installation preferences—such as desired detection range, output types, alignment options and the presence of walk-test indicators. The GJD D-TECT 3 stands out for its combination of a metal housing, selectable EOL resistors, pan/tilt alignment and clear engineer-focused features.
Price-wise, the suggested retail for the D-TECT 3 is around 339.99 (check local currency and reseller pricing). While higher than basic PIR-only detectors, it is competitive among professional-grade outdoor detectors that prioritise low nuisance alarm rates and physical robustness.
Customer feedback and reviews
Direct user reviews for specific installations vary by site conditions and installer tuning. Below are representative, anonymised examples of installer and user feedback based on typical field experience with triple-tech external detectors like the D-TECT 3. These are illustrative summaries, not verbatim verified customer quotes:
- Experienced installer:"Once aligned and tuned, the unit gives very stable performance. The walk-test LEDs save time during commissioning and the metal housing is appreciated for exposed sites."
- Site security manager:"We saw a reduction in nuisance alarms after switching to triple-tech detectors—especially during windy autumn months when leaves used to trigger our old sensors."
- Integrator:"Flexible output options meant no extra modules were needed to interface with the existing alarm panel and camera system. The dusk trigger was handy to prevent daytime activations."
For prospective buyers, it’s recommended to consult local case studies and installer references, and to insist on professional commissioning to realise the full benefits of the product.
Conclusion: why the GJD D-TECT 3 is a strong choice
The GJD D-TECT 3 (GJD310) is a thoughtfully engineered wired external motion detector that balances detection performance, false alarm management and installer-friendly features. Its triple-technology sensing, programmable 30 m range, adjustable optics and durable metal housing make it especially suitable for perimeter protection, CCTV-triggered workflows and installations where resilience and low nuisance alarms are priorities.
While it carries a higher price point than basic PIR units, that cost reflects professional-grade capabilities—robust construction, multiple outputs, EOL resistor options and practical commissioning aids. For security integrators, facility managers and installers seeking a long-range external detection layer that integrates smoothly with panels and cameras, the D-TECT 3 is a compelling option.
Safety and compliance note: Always follow the official GJD datasheet and installation manual for wiring, regional microwave frequency variants and regulatory approvals (CE / UKCA where applicable). For full technical details, wiring diagrams and regulatory information consult the official GJD product datasheet and your authorised supplier.
