Introduction to the GJD D‑TECT 50 AM
GJD D‑TECT 50 AM (GJD359)is a purpose‑built external perimeter motion detector that combines dependable dual‑PIR sensing with active anti‑masking to protect boundaries, gates and critical external areas. Designed for demanding outdoor environments, the unit is housed in a rugged zinc‑alloy, IP65 enclosure and offers a programmable detection beam of up to 50 m. Whether you need reliable intruder detection, CCTV activation or a BS8418‑compliant perimeter solution, the D‑TECT 50 AM is engineered to minimise false alarms while providing clear, actionable signals to alarm panels and video systems.
Key highlights include active infra‑red anti‑mask sensing to detect attempts at obstruction, quad‑element dual PIR optics for robust detection and configurable outputs and sensitivity settings that make the detector adaptable to a wide range of installations.
Key features at a glance
- Active anti‑masking: Infra‑red sensor detects masking attempts to obscure the unit.
- Long, programmable range: 25–50 m selectable detection; standard coverage 50 m × 10 m (extra lens gives 50 m × 5 m).
- Dual PIR quad optics: 12 zones per pyro pair for reliable detection with enhanced false alarm resistance.
- Rugged construction: High‑impact zinc‑alloy housing with conformal coating on electronics; IP65 rated for harsh outdoor use.
- Flexible outputs and settings: Volt‑free solid‑state outputs, common tamper, configurable pulse count, sensitivity and LED walk‑test.
- Adjustable mounting: 180° pan and 45° tilt allow precise aiming; optimal mounting height around 3 m.
Detailed specifications and benefits
Understanding the technical specifications helps highlight how the D‑TECT 50 AM delivers performance in real installations:
- Detection range and area: Programmable between 25–50 m, with the standard lens providing a 50 m × 10 m detection corridor. For tighter coverage, an extra lens reduces the width to 5 m. This flexibility reduces nuisance alarms from adjacent properties and allows integrators to tailor the beam to the perimeter geometry.
- Sensing optics: Quad‑element dual PIR design creates multiple overlapping zones (12 zones per pyro pair), improving detection of human movement while resisting false triggers from small animals, vegetation or environmental noise. The dual element arrangement also supports coincidence logic, further minimising false positives.
- Anti‑masking: The active infra‑red anti‑mask module monitors the detector’s face for obstruction (spray, tape, foliage, or objects placed over the lens). This is critical for high‑risk sites where attackers may attempt to neutralise perimeter sensors before intrusion.
- Electrical and outputs: Operates from 9–15 V DC with a low typical current draw (about 12 mA at 12 V nominal). Outputs include three volt‑free solid‑state outputs plus a common tamper contact. Pulse count (1–2), LED indication and sensitivity are configurable, making the device compatible with most alarm panels and VMS/CCTV triggers.
- Durability and environmental protection: The high‑impact zinc‑alloy housing and IP65 rating protect against water ingress and mechanical damage. Conformal coating on electronics provides additional protection against moisture, salt spray and condensation—important for seaside or exposed installations.
- Mounting and installation: Adjustable pan (180°) and tilt (45°) simplify alignment across long stretches of fencing or along walls. Recommended mounting around 3 m offers the best balance of coverage and false‑alarm immunity.
- Reduced false alarms through dual‑PIR coincidence and selectable range—lower operational costs and fewer unnecessary site attendances.
- Improved security posture via active anti‑masking that alerts to tampering attempts, protecting the detector’s integrity.
- Versatile integration options with volt‑free outputs and configurable settings, enabling straightforward connection to alarm panels and CCTV systems for automated responses.
- Robust outdoor suitability limits maintenance and replacement costs in exposed or corrosive environments.
Use cases and scenarios where the D‑TECT 50 AM excels
The D‑TECT 50 AM is well suited to a wide range of perimeter protection tasks. Typical applications include:
- Perimeter fence line protection: Long‑range, narrow beam coverage makes it ideal for monitoring fence lines, boundary walls and hedges without spilling detection into neighbouring properties.
- Commercial and industrial sites: Warehouses, distribution centres and plant yards benefit from anti‑masking and durable housing for 24/7 protection of external assets.
- CCTV activation: Use the detector to trigger cameras or recorders only when a genuine detection occurs, reducing storage requirements and easing operator workload.
- Critical infrastructure: Sites requiring heightened security—utilities, transport hubs and logistic hubs—gain the advantage of tamper detection and BS8418 suitability when integrated into compliant systems.
- Residential estate perimeters: For gated communities or large private properties where a reliable external trigger is needed to activate cameras or alarm systems.
How it compares with similar products
When evaluating perimeter detectors, buyers typically consider optics, anti‑mask capability, environmental resilience and integration options. Here’s how the D‑TECT 50 AM stacks up in these areas:
- Against single‑PIR or passive units: Single‑element or less sophisticated PIR sensors are more prone to false alarms from animals and environmental factors. The dual quad‑element design and coincidence processing in the D‑TECT 50 AM significantly reduce these issues.
- Against microwave/PIR hybrid sensors: Microwave hybrids offer robust detection but can be susceptible to environmental reflections and require careful tuning. The GJD unit focusses on long optical range with active anti‑masking, providing simpler, reliable corridor coverage without the potential RF interference issues of microwave devices.
- Against other anti‑masking detectors: Some competitors require additional modules to add anti‑mask capability. The D‑TECT 50 AM includes active anti‑masking within a single package, simplifying procurement and installation for sites needing tamper detection.
- Durability comparison: The zinc‑alloy housing and conformal coating give it an edge in coastal or industrial environments versus plastic‑bodied alternatives that may age faster in harsh conditions.
Customer feedback and installer impressions
While specific customer testimonials vary by project, typical feedback from security installers and end users focuses on a few recurring strengths:
- Reliable long‑range coverage: Installers appreciate the 25–50 m selectable range which allows them to tailor coverage and avoid nuisance alarms from neighbouring properties.
- Effective anti‑masking: Site managers value the built‑in active anti‑mask feature as it prevents simple neutralisation of perimeter sensors.
- Robust build quality: Users report long service life in outdoor settings with minimal maintenance, especially in exposed locations.
If you are evaluating the product, consider engaging an experienced integrator who can provide site‑specific references and possibly case studies from similar installations.
Installation and safety notes
Professional installation is recommended. The detector should be mounted at the recommended height (around 3 m) and aimed precisely using the 180° pan and 45° tilt adjustments. Confirm compatibility with your alarm/CCTV panel and follow local regulations and BS8418 guidance where applicable. For wiring runs, respect the cable distance guidelines provided by the manufacturer to ensure reliable signaling.
Conclusion — why choose the GJD D‑TECT 50 AM?
TheGJD D‑TECT 50 AM (GJD359)is a focused solution for perimeter protection that balances long‑range detection, robust environmental protection and anti‑masking in a single, easy‑to‑integrate package. Its programmable 25–50 m range and narrow corridor optics reduce spill‑over and nuisance alarms, while the active anti‑masking increases security against deliberate tampering. Installers benefit from flexible outputs, low power consumption and straightforward mounting options, and site owners gain a resilient detector designed for continuous outdoor operation.
Priced with a suggested retail of around 319 (check local distributors for current pricing and availability), the D‑TECT 50 AM represents good value for projects that prioritise perimeter integrity and low false alarm rates. For perimeter, CCTV activation and BS8418‑compliant installations, it is a dependable choice that reduces operational overhead and improves situational awareness.
Note:Always consult the official GJD datasheet and employ a qualified installer for any security system deployment. Confirm system compatibility and compliance requirements for your particular site before purchase.
