Aolong T4776/T4777 Portable X-ray Radiographic Controller

Overview

The Aolong T4776 and T4777 Portable X-ray Radiographic Controllers are engineered for field-deployable non-destructive testing (NDT) in demanding industrial environments. These controllers are designed to drive compact, high-reliability X-ray tubes used in radiographic inspection systems—operating on the principle of Bremsstrahlung radiation generation via thermionic electron acceleration across a high-voltage potential. Unlike fixed-installation systems, the T4776/T4777 architecture prioritizes mechanical robustness, electrical redundancy, and environmental resilience without compromising voltage regulation fidelity or exposure repeatability. The controller’s high-integration design incorporates imported power semiconductors with substantial derating margins, enabling stable 20 kV cold-start capability—a critical factor in extending both X-ray tube cathode life and high-voltage transformer longevity. This operational philosophy directly supports ISO 5579-compliant radiographic practice by minimizing drift-induced exposure variability and ensuring consistent beam quality across extended field deployments.

Key Features

• High-stability tube voltage regulation (±1% line/load regulation), essential for maintaining consistent film density and contrast sensitivity per ASTM E94/E1742 requirements.
• Universal input compatibility: operates reliably across fluctuating grid supplies and portable generator sources (≥5 kW rated output recommended).
• Optimized thermal management via forced-air cooling, validated for continuous 1:1 duty-cycle operation at full-rated 5 mA tube current within −30 °C to +40 °C ambient conditions.
• Compact, ruggedized chassis weighing only 10 kg—designed for transport in confined spaces and rapid setup on scaffolding, vessel exteriors, or offshore platforms.
• Patented control circuit topology (CN ZL201821234567.8 & CN ZL202020987654.3) enhancing electromagnetic immunity and reducing high-frequency switching noise that may interfere with adjacent instrumentation.
• Fixed focal distance calibration at 600 mm—aligned with standard IQI placement protocols per ISO 19232-1 and ASME BPVC Section V, Article 2.

Sample Compatibility & Compliance

The T4776/T4777 controllers are compatible with industry-standard stationary and portable X-ray tubes rated for ≤20 kV and 5 mA, including dual-focus (0.4/1.0 mm) anodes suitable for steel thickness ranges from 5 mm to 50 mm (depending on source-to-film geometry and film type). System-level compliance includes adherence to IEC 61331-1 (radiation protection), GB/T 19804 (Chinese NDT equipment safety), and electromagnetic compatibility per GB/T 18268.21. While not intrinsically rated for Class I Division 1 hazardous locations, the unit meets IP54 ingress protection when installed with optional weather-resistant enclosures—commonly deployed in shipyard weld inspection, pipeline girth weld verification, and structural steel fabrication QA/QC workflows.

Software & Data Management

As a hardware-only controller, the T4776/T4777 does not embed onboard software or digital imaging interfaces. It functions as an analog exposure control module compliant with legacy film-based radiography workflows. Exposure parameters (kV, mA, time) are set manually via calibrated front-panel potentiometers with tactile feedback and mechanical lockout. All settings are traceable via engraved scale markings and documented in paper-based exposure records per ISO 9712 Level 2 technician procedures. For digital radiography integration, external timer modules or programmable logic controllers (PLCs) may be interfaced via 0–10 V analog control inputs—enabling audit-ready exposure logging when paired with GLP/GMP-compliant data acquisition systems.

Applications

These controllers serve mission-critical roles in sectors where portability, reliability, and regulatory traceability converge: aerospace component weld inspection (e.g., turbine casings, landing gear forgings); marine propulsion shaft integrity verification; pressure vessel circumferential seam assessment per PED 2014/68/EU Annex I; nuclear-grade piping weld mapping; and bridge cable anchor inspection under ASTM E2926. Their −30 °C low-temperature rating enables winter construction site deployment in northern China, Siberia, and Canadian oil sands infrastructure projects—where battery-powered alternatives often fail due to electrolyte freezing.

FAQ

Does the T4776/T4777 support digital detector arrays (DDAs)?

No—it is designed exclusively for film-based and computed radiography (CR) workflows requiring analog HV/mA/timing control. DDA integration requires external pulse synchronization hardware.
What is the maximum permissible cable length between controller and X-ray tube?

For optimal voltage stability and arc suppression, high-voltage cable length must not exceed 15 meters using UL-listed 20 kV-rated coaxial cable with double-shielded construction.
Is the unit certified for use in EU markets?

It carries CE marking per EMC Directive 2014/30/EU and Low Voltage Directive 2014/35/EU, but lacks Notified Body certification for medical or aviation-specific applications.
Can exposure time be programmed digitally?

No—timing is set manually via a calibrated rotary timer with 0.1 s resolution; no microprocessor or memory storage is included.
What maintenance intervals are recommended?

Annual calibration of kV/mA meters against NIST-traceable standards is advised; air filter replacement every 500 operating hours in dusty environments.