Introduction to the GJD D-TECT 50 (GJD350) and its key features
The GJD D-TECT 50 (GJD350) is a purpose-built long-range external PIR perimeter detector designed for professional perimeter protection. With a programmable detection range of 25–50 m, quad-element passive infrared (PIR) sensors and custom optics, it delivers a narrow, focused detection beam suitable for fences, driveway approaches and long external runs. Housed in an IP55-rated zinc-alloy body with conformally coated electronics, the D-TECT 50 is engineered to withstand exposed outdoor environments while integrating with wired intruder alarm systems through volt-free solid-state outputs.
Key features at a glance:
- Programmable long-range detection: 25–50 m
- Quad-element PIR with 12 detection zones per pyro pair for narrow, accurate beams
- Coverage up to 50 × 10 m with 180° pan and 90° tilt for precise alignment
- Two volt-free solid-state alarm outputs, front & rear tamper, adjustable timer and light sensing
- Robust zinc-alloy housing, IP55 protection, conformal-coated electronics
- Wide power input (9–24 VAC/DC) and low current draw (approx. 12 mA at 12 V)
Detailed specifications and their practical benefits
Understanding the D-TECT 50’s specifications helps explain why it’s suited to long-range perimeter roles. The detector’s programmable range (25–50 m) gives installers flexibility to match detection distance to site geometry and threat profile. The quad PIR design with 12 detection zones per pyro pair creates a narrow, long-range beam that reduces boundary overspill — a common problem when protecting areas that run parallel to public access or neighbouring properties.
- Range and coverage:Programmable 25–50 m and theoretical coverage up to 50 × 10 m make this unit ideal for long approach detection and fence-line protection. The narrow beam reduces false positives from adjacent areas while maximizing detection distance.
- Sensor architecture:Quad-element PIR with multiple zones increases detection reliability by requiring consistent motion across zones. This improves immunity to transient heat sources and small animals when properly aligned.
- Adjustability:Pan 180° and tilt 90° allow precise aiming to align the beam with fence lines, gateways or approach lanes. Optimal mounting height is approximately 3 m to balance range and sensitivity.
- Outputs and integration:Two volt-free solid-state alarm outputs plus front and rear tamper contacts enable clean interfacing with most wired intruder alarm panels and monitoring systems. The adjustable timer (2–60 s) and configurable light sensing (dusk through 24 h) provide flexible alarm and operational behaviours.
- Durability and installation:The high-impact zinc-alloy housing with conformal coating and IP55 rating resists corrosion and moisture ingress, making the detector suited for exposed outdoor sites such as industrial yards and perimeter fences. Powering options from 9–24 VAC/DC and low current demand (≈12 mA at 12 V) allow compatibility with a wide range of alarm system power supplies.
- Operating range:Designed to operate from −20 °C to +55 °C, suitable for many climates. Compact dimensions (approx. 145 × 120 × 115 mm) and weight (approx. 750 g) make it straightforward to mount and handle during installation.
Installation, safety and accessories
For reliable performance the D-TECT 50 should be mounted at the recommended height (around 3 m) and carefully aimed using its broad pan and tilt range. Installers should follow GJD’s installation guidelines and wiring best practice — isolating supplies before wiring and using qualified personnel for mains work. Accessories such as the GJD304 conduit adaptor, GJD308 D-Guard, GJD380 walk tester and PMB1 pole bracket are available to simplify conduit entry, mechanical protection and commissioning.
Power and wiring considerations:The product accepts a wide input voltage (9–24 VAC/DC), reducing dependency on specific supplies. Its low current draw helps when multiple detectors are powered from a common source. Volt-free solid-state outputs mean it can interface cleanly with alarm panels without needing additional relays.
Compliance and warranty:Buyers should verify CE/UKCA conformity and consult the latest datasheet and supplier for retrofit or new installations. Warranty details were not provided in the supplied product data; confirm warranty and support terms with your vendor at purchase.
Use cases and scenarios where the D-TECT 50 excels
The D-TECT 50 is tailored to situations that demand long-range, narrow-beam detection with robust outdoor durability. Typical applications include:
- Perimeter fencing:Long fence runs where the detector can be mounted to create a tightly focused detection corridor along the fence line, minimizing cross-boundary activation.
- Industrial sites and warehouses:Protecting large open yards and approach lanes where early long-range detection is needed to provide time for response or CCTV cueing.
- Driveway and access approaches:Detecting vehicles or people approaching from distance along a narrow approach, allowing integration with lighting, cameras or access control.
- Transport and utility sites:Rail yards, substations and depots where a rugged, long-range sensor helps secure exposed assets.
- Layered security systems:As a first-line long-range detector that cues PTZ cameras or activates intermediate sensors and lighting before closer-range perimeter sensors are triggered.
Comparisons with similar products on the market
Within the perimeter PIR category the D-TECT 50 competes with other long-range PIR devices and active technologies such as dual-technology perimeter detectors and active infrared beam systems. Key comparative points to consider:
Short-range PIRs (typically <15 m) suit doorways and small perimeters; they are not optimal for long fence runs. The D-TECT 50’s 25–50 m programmable range gives it an advantage for large areas where an early-warning detection corridor is required.
Active IR beam systems provide precise, linear detection but can be susceptible to vandalism, alignment drift and environmental obscuration (fog, heavy rain). The D-TECT 50’s quad-element passive approach offers robust, tamper-resistant mounting and reduced maintenance in many outdoor conditions, although beam systems may still be preferable where instantaneous line-break detection is mandatory.
Dual-technology devices (PIR plus microwave) can offer improved immunity to false alarms in some environments but risk increased complexity and higher cost. The D-TECT 50’s advanced signal processing, multiple zones and narrow optics aim to reduce false alarms while keeping the simplicity and lower electromagnetic susceptibility of PIR-only designs.
When comparing models, consider detection distance, beam width, environmental tolerance, outputs (volt-free relays vs dry contacts), housing robustness and the availability of accessories such as mounting brackets and walk testers. For long fence lines and approach detection where a narrow, durable PIR beam is needed, the D-TECT 50 is a strong contender.
Customer feedback and installer perspectives
No verified customer testimonials were supplied with the product brief, so prospective buyers should consult distributor sites, forums or installer reviews for real-world feedback. From typical installer commentary on similar GJD devices, common positive points include straightforward aiming and commissioning, solid build quality, and reliability in exposed locations. Installers also frequently note the value of optional accessories (pole brackets, walk testers) to reduce commissioning time and improve long-term stability.
As with any perimeter sensor, proper siting and alignment are critical: many service calls are attributable to misalignment, incorrect mounting height or local environmental factors (e.g., reflective surfaces, heat sources). Engaging a qualified security installer ensures the unit is configured for maximum performance and minimal nuisance alarms.
Conclusion: why the D-TECT 50 is a strong choice for perimeter protection
The GJD D-TECT 50 (GJD350) combines long-range programmable detection, narrow-beam quad PIR optics, robust IP55 zinc-alloy construction and flexible integration options to meet the needs of professional perimeter security installations. Its ability to focus detection along fences and approaches, coupled with low current draw and a wide input voltage range, makes it versatile for many sites.
While active beam systems and dual-technology detectors have their places, the D-TECT 50 strikes a balance of simplicity, long-range performance and outdoor durability. For installers and security managers seeking a reliable long-range PIR detector for industrial perimeters, warehouses, driveways and other exposed sites, the D-TECT 50 is worth considering. Confirm CE/UKCA conformity, warranty and accessory availability with your supplier before purchase, and engage a qualified installer to achieve the best results.
Pricing note:The supplied cost price is 229.20 (currency not specified) with a suggested RRP of 273.00 in the same currency unit. Final pricing, warranty and support should be confirmed with your supplier at the time of purchase.
