How to operate Glow Wire Tester?

The Glow Wire Tester is a specialized instrument designed to evaluate the fire hazard risk of electrical and electronic products, household appliances, and their materials under high-temperature conditions. By simulating overheating scenarios caused by electrical faults—such as overloads or poor contact—the device applies precise thermal stress to materials or finished products to test their ignition resistance and ability to prevent flame propagation. As a standardized industry testing method, the Glow Wire Tester is widely used in product quality control, safety certification, and new product development.

Detailed Operating Procedures

This device strictly complies with international standards, including IEC 60695-2-10. and Chinese national standards, such as GB/T 5169.10. ensuring standardized operation procedures and rigorous safety requirements.

1. Pre-use Preparation

Environmental Requirements:

The laboratory should maintain room temperature, be dry, and free from strong airflow to avoid interfering with flame behavior or affecting temperature stability.

Place the device on a stable, level surface, with a power supply of AC 220V, 50Hz, and ensure proper grounding.

Equipment Checks:

Glow Wire Condition: Typically made of nickel-chromium alloy (Ni/Cr 80/20 or 77/20) with a standard diameter of 4 mm; actual use requires a diameter greater than 3.9 mm. Replace if contaminated, oxidized, or below standard diameter.

Thermocouple Check: Ensure K-type thermocouples (0.5–1.0 mm) are correctly connected; the armored sheath must withstand temperatures ≥1050℃.

Place a standard test substrate 200 ± 5 mm below the sample, usually composed of a pine board with a layer of standard tissue paper (12–30 g/m²), to evaluate ignition potential.

Ensure sample clamps are secure; the sample surface must be perpendicular to the glow wire, with an initial gap of approximately 1 mm.

Calibration (Recommended for first use and periodic verification):

Silver Foil Calibration Method: Place a 2 mm × 2 mm silver foil (purity 99.8%, thickness 0.06 mm) at the top of the glow wire and heat until the foil melts. The theoretical temperature should be 960 ± 15℃. Compare the measured value to verify the accuracy of the temperature control system.

2. Operating Procedures

Preheating:

Turn on the power and heating system, and set the target temperature according to the testing standard (e.g., 550℃, 650℃, 750℃, 850℃, or 960℃).

Wait for the temperature to stabilize, typically 5–10 minutes, with fluctuations not exceeding ±2℃.

Sample Installation:

Securely clamp the pretreated and dried sample in the holder, ensuring perpendicular alignment with the glow wire.

Apply a constant pressure of 1.0 N ± 0.2 N (or 0.95 N ± 0.1 N per some standards) using the mechanical system.

Test Execution:

Close the test chamber and start the program via the control interface. The device automatically moves the glow wire toward the sample at a speed of 10–25 mm/s.

Start timing; the standard glow duration is 30 ± 1 seconds, adjustable from 10–60 seconds as needed.

Data Recording and Observation:

Key parameters are recorded automatically or manually, including ignition time (Ti), flame extinguishing time (Te), and whether the substrate ignited.

High-end models (e.g., KS-51B) may include automatic judgment features, outputting “Pass” or “Fail” based on pre-set logic.

Completion and Cleanup:

After testing, the glow wire retracts automatically. Activate the exhaust system to remove smoke, and clean residuals after cooling.

Export and backup test data, and generate reports in standard formats as needed.

3. Safety Precautions

Personal Protection: Operators must wear heat-resistant gloves and safety goggles to prevent burns or flame splashes.

Equipment Safety: Do not open the test chamber or move the device while hot. Keep power connections dry and avoid operation in high humidity.

Emergency Measures: Keep fire-fighting equipment on site. Press the emergency stop button immediately if abnormal conditions occur, cutting off heating and activating safety protocols.

Value and Applications

The Glow Wire Tester is indispensable for evaluating flame-retardant performance in electronics, household appliances, low-voltage electrical equipment, and materials. It serves as a core tool for quality control, product development, and obtaining safety certifications such as CE, UL, and CQC.

Key Roles:

Simulates Real Thermal Faults: Heating a nickel-chromium glow wire to 300–1100℃ replicates thermal stress caused by short circuits, overloads, or poor contact, evaluating material ignition propensity and burn duration.

Measures Core Flame-Retardant Indicators: Includes Glow Wire Ignition Temperature (GWIT) and Glow Wire Flammability Index (GWFI) for quantifying material fire ratings.

Compliance with International Standards: Meets IEC 60695-2-10. GB/T 5169.10. and other national and industry standards.

Wide Application: Suitable for lighting, low-voltage appliances, insulation materials, power tools, IT devices, and other products/materials requiring fire safety testing.

Core Advantages:

High-Precision Temperature Control: K-type armored thermocouples provide ±2℃ control accuracy; calibration at 960℃ has a maximum error of ±15℃.

Automation and Intelligence: Integrated touchscreen and PLC system automatically records ignition time, extinguishing time, and glow duration. Supports data storage, report generation, and printing, reducing human error.

Safety and Ease of Operation: Observation window, protective circuits, automatic disengagement, and precise pressure control (0.95–1.05 N) with insertion depth 7 ± 0.5 mm.

Efficiency: Fast heating (e.g., 750–960℃ in ~10 minutes), supporting continuous or batch testing.

System Adaptability and Expandability: Optional smoke exhaust system, adaptable for various sample sizes/shapes, suitable for electronics, construction, automotive, textiles, and more.

Future Development Trends

Increased Intelligence and Automation: Integration with LIMS, automatic sample feeding, and cloud-based data management.

Enhanced Compliance: Strict adherence to IEC 60695 and GB/T 5169 standards; multi-standard compatibility for global markets.

Improved Safety and Environmental Features: Smoke purification as standard, automatic power cut, emergency stop, grounding protection.

Optimized Accuracy and Stability: Higher temperature control precision, frequent thermocouple calibration, and stable current/force application.

Expanded Applications: Beyond electronics, extending to new energy (lithium battery insulation), 5G devices, rail transit cables, and material R&D requiring precise GWIT/GWFI measurements.

In summary，the Glow Wire Tester is a critical technical tool in modern industry, increasingly essential for ensuring electrical and electronic product compliance with international fire safety standards. It effectively evaluates material flame-retardant performance under high temperatures, helps manufacturers identify potential hazards early, enhances product reliability, and provides robust safety assurance for end users.