Introduction to the GJD D‑TECT Laser GJD505 and its key features
The GJD D‑TECT Laser (model GJD505) is a compact, high‑precision perimeter sensor designed to create virtual curtain‑style detection zones up to 5.0 × 5.0 m. Using time‑of‑flight laser scanning, the GJD505 detects movement and presence with programmable positional resolution of approximately 10 cm. Built for both indoor and outdoor use, the unit comes in an IP65 rated housing, includes visible alignment beams for fast installation, and supports remote programming for commissioning and configuration.
Key features at a glance:
- Curtain‑style detection:Up to four configurable sensing curtains (alarm + pre‑alarm) for tailored protection schemes.
- High positional resolution:Programmable ~10 cm resolution and angular resolution of about 0.3516° for fine detection and improved noise immunity.
- Visible alignment beams:Red alignment lasers to speed and simplify setup (visible only during alignment).
- Robust outdoor build:IP65 housing with wide temperature and humidity tolerance.
- Installer‑friendly tools:Remote programming support and accessories such as the GJD501 programmer and optional mounting brackets.
The GJD505’s technical credentials are designed to deliver reliable perimeter protection in challenging environments. Below are the most important specifications and the practical benefits they provide:
- Detection mode — Time‑of‑flight laser (movement & presence):This mode measures the round‑trip time of pulsed infrared emissions (905 nm) to determine the presence and movement of objects within the predefined curtain zones. Time‑of‑flight sensing is inherently precise and less affected by ambient light than some optical alternatives.
- Detection range — 5.0 × 5.0 m:Ideal for doorways, narrow approaches, fencing lines, small perimeters and asset protection where a focused curtain detection is required rather than wide‑area coverage.
- Angular & positional resolution:Angular resolution is approximately 0.3516°, and positional resolution is programmable to around 10 cm. In practice this enables the detector to reliably detect small targets (typical minimum target size: ~2.1 cm at 3 m, ~3.5 cm at 5 m), which reduces blind spots and improves detection of focused intrusions.
- Response time:Typical response is 20 ms (up to 80 ms maximum). Such fast response times help ensure rapid alarm reporting and are useful for active security systems that must react quickly to breaches.
- Outputs & integration:Two galvanically‑isolated relays (for alarm and tamper) capable of switching approximately 80 mA resistive loads. These outputs make the GJD505 straightforward to integrate with alarm panels, access controllers or external logging systems.
- Power & LEDs:Requires a 24 VDC supply (manufacturer recommends a 3 A supply—see datasheet for inrush detail). LEDs indicate power, fault and detection states and can be switched off for covert applications.
- Alignment & commissioning aids:Three red visible alignment lasers simplify set‑up and aiming; the alignment beams are active only during commissioning to avoid continuous visible emission. Remote programming via the GJD501 programmer and optional spotfinder facilitate in‑field tuning without repeatedly accessing the device housing.
- Mechanical & environmental:PC/ASA housing sized roughly 70 × 93 × 125 mm (H × W × D), IP65 ingress protection, operating temperature range when powered from −30°C to +60°C (unpowered −10°C to +60°C), and humidity tolerance 0–95% non‑condensing.
- Standards & safety:Emission specifics: a 905 nm pulsed IR laser classified as Class 1 in normal operation; alignment beam is a 650 nm red laser Class 3R only while aligning. Conforms to applicable laser, EMC, LVD and RoHS standards as listed in the datasheet.
High resolution and fast response combine to reduce false alarms while improving detection of small or slow targets. The compact IP65 housing and temperature range make it appropriate for many outdoor installations, while the visible alignment aids and remote programming tools lower installation time and cost. Together, these features give security integrators a robust, configurable sensor for focused perimeter and access protection tasks.
The GJD505 is particularly well suited to applications that need precise, curtain‑style detection rather than full‑area coverage. Typical and recommended use cases include:
- Perimeter intrusion detection:Protecting narrow perimeters such as fences, walls and hedgerows where a virtual curtain can define a clear trip line without false triggers from distant motion.
- Doorway and access control:Monitoring entrances, gates or service doors to detect unauthorized entry attempts or to provide presence signals to access control systems.
- Asset protection:Shielding valuable equipment, outdoor storage areas and isolated assets where a directed curtain prevents approach without covering large areas with cameras or wide‑area detectors.
- Temporary or portable zone protection:Events, construction sites or temporary installations that require rapid deployment of a reliable detection fence without permanent cabling or large infrastructure.
- High‑security choke points:Locations where high positional accuracy is needed to distinguish between people and small animals or vegetation movement—programmable resolution helps tailor the system to reduce nuisance alarms.
Because the device supports remote programming and offers alignment aids, it is often chosen by installers who need repeatable, predictable performance across multiple similar installations.
When choosing perimeter sensors, integrators and end users commonly consider several technologies: passive infrared (PIR) curtain sensors, microwave detectors, active beam detectors, fiber optic fences, and camera‑based analytics. The GJD505’s laser time‑of‑flight approach has distinct advantages and trade‑offs compared with these alternatives:
- Vs PIR curtain sensors:PIR curtains rely on thermal contrast and can be sensitive to environmental temperature changes and wind‑blown objects. The GJD505’s laser measurement detects physical presence and movement independent of temperature, improving reliability in variable climates and reducing false alarms from thermal transients.
- Vs microwave detectors:Microwave sensors provide broad coverage but can be influenced by metallic objects and environmental reflections. Laser curtains deliver precise, localized detection with higher positional accuracy—ideal for narrow zones where microwaves may be too indiscriminate.
- Vs active infrared/beam detectors:Traditional IR beams detect breaks in a beam path but often require multiple beams and careful alignment over distance. Laser time‑of‑flight provides a programmable curtain with high positional resolution and integrated alignment aids, which can simplify installations that would otherwise require multiple beam units.
- Vs camera analytics:Cameras provide visual verification and analytics but depend on visibility, lighting and bandwidth. The GJD505 operates in all lighting conditions, offers deterministic detection without the need for image processing, and integrates easily with alarm systems for low‑latency responses.
In terms of cost and complexity, laser curtain sensors like the GJD505 generally sit between single beam detectors and full camera systems. They provide high accuracy and environmental robustness without the data overhead and privacy concerns of video while being more precise than many passive technologies.
There are limited public consumer reviews specific to the GJD505, which is commonly sold through installer and trade channels as a professional security component rather than a retail consumer product. Feedback gathered from integrators and installers who use laser curtain detectors typically highlights:
- Quick commissioning when alignment beams and remote programming tools are available, reducing on‑site time.
- Low nuisance alarm rates in controlled deployments thanks to programmable resolution and configurable sensing curtains.
- Suitability for compact installations where a targeted detection curtain is preferable to wide‑area sensors or cameras.
Prospective buyers should ask their installer for references or case studies for comparable deployments, and verify sensitivity tuning during commissioning to ensure reliable operation in their specific environment.
The GJD505 requires a 24 VDC supply (manufacturer recommends a 3 A supply—see the datasheet for inrush requirements). The visible alignment laser is Class 3R only during commissioning; the primary IR emission is Class 1 in normal operation. Installers must follow local laser safety guidance, wiring regulations and the manufacturer datasheet for correct mounting, earthing and environmental protection.
The GJD D‑TECT Laser GJD505 offers a compelling balance of precision, environmental robustness and installer convenience for targeted perimeter and access protection tasks. Its time‑of‑flight laser sensor provides high positional resolution and fast response, making it ideal for doorway protection, narrow perimeter detection and asset safeguarding where false alarms and environmental interference must be minimised. IP65 rating and wide operating temperatures extend its applicability to outdoor scenarios, while alignment beams and remote programming reduce installation time and complexity.
For system integrators and security managers seeking a focused, reliable curtain detector without the complexity of video systems or the limitations of thermal‑based sensors, the GJD505 is a strong option. With a suggested price around the mid‑market for professional detection units, and compatibility with GJD programming and mounting accessories, it fits well into professional security installations where accuracy and low nuisance alarm rates are priorities.
