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Home News Standardized Design and Intelligent Measurement & Control Technology of Glow-wire Tester
29 Jul, 2026 2 Views Author: Cherry Shen

Standardized Design and Intelligent Measurement & Control Technology of Glow-wire Tester

Abstract: Glow-wire tester is essential testing equipment for evaluating flame retardant performance of materials and components in electrical, home appliance, lighting and automotive industries. It simulates high-temperature heat source contact under fault condition to assess ignitability, combustibility, Glow Wire Flammability Index (GWFI) and Glow Wire Ignition Temperature (GWIT). Taking LISUN ZRS‑3H glow-wire tester as research object, this paper systematically studies standard compliance, precision of core test condition reproduction and intelligent control functions. Complying with latest domestic and international fire safety standards, this tester accurately realizes core test parameters including 960℃ glow wire temperature and 1N contact force. Equipped with automatic timing, auto recording of ignition and extinguishing time as well as automatic sample retraction after heating, the equipment effectively reduces manual operation error and guarantees accuracy and repeatability of test data. Combined with technical parameters, standard specifications and practical application cases, the engineering value of this glow-wire tester in product safety certification and quality management is verified to provide technical reference for equipment selection and test implementation.
 

Introduction

With rapid development of consumer electronics, household appliances, lighting fixtures and automotive electronics, internal insulating parts, structural components and plastic housings face increasing fire risks caused by overload, short circuit and poor contact faults. As key certification equipment, glow-wire tester reproduces extreme thermal stress from glowing heat source to implement accelerated flammability evaluation and confirm fire safety grade for market access approval.

Traditional glow-wire tester suffers obvious drawbacks including large temperature drift, unstable contact pressure, manual stopwatch timing and delayed specimen separation after test, which introduces human errors and poor data consistency. Optimized against existing industry deficiencies, LISUN ZRS‑3H glow-wire tester strictly follows updated GB/T 5169 and IEC 60695‑2 series standards. Relying on high-precision temperature control, constant pressure mechanism and full automatic control system, it reproduces standard test conditions reliably and improves testing efficiency and stability. 

Glow Wire testing

Figure: Glow Wire Test Apparatus

Standard System and Core Requirements for Glow-wire Tester

Design and operation of glow-wire tester must comply with unified specifications to achieve globally recognized and comparable test results. LISUN ZRS‑3H fully meets the following mainstream standards:
• Chinese Standards: GB/T 5169.10‑2023, GB/T 5169.11‑2017, GB/T 5169.12‑2024, GB/T 5169.13‑2024
• International Standards: IEC 60695‑2‑10:2021, IEC 60695‑2‑11:2021, IEC 60695‑2‑12:2021, IEC 60695‑2‑13:2021
• North American Standard: UL 746A:2023 (Clause 35)

The above standards define mandatory technical indexes for glow-wire tester: stable 960℃ heating temperature, 1N contact force, precise timing and flame duration recording, and prompt glow wire retraction upon test completion. ZRS‑3H realizes all specification requirements via optimized hardware structure and control algorithm to ensure valid and repeatable test results.

Precise Reproduction of Core Test Conditions for Glow-wire Tester

High-precision Temperature Control for Stable 960℃ Setting
ZRS‑3H glow-wire tester adopts φ4mm Ni80/Cr20 nickel-chromium glow wire together with φ1mm armored K-type thermocouple, with temperature accuracy ±3℃ and resolution ±1℃ within adjustable range from ambient temperature up to 1100℃. Closed-loop PID temperature control algorithm enables fast stabilization at standard 960℃ with tiny fluctuation and consistent heat input during each test.

Constant Contact Pressure to Meet Standard 1N Requirement
Precision mechanical structure controls contact pressure within 0.95N±0.1N and limited penetration depth of 7mm, matching standard specified 1N contact requirement perfectly. Constant pressure design avoids excessive heat transfer under overweight compression or insufficient thermal contact under underweight loading to guarantee excellent test repeatability mechanically.

Automatic Retraction Mechanism after Glow Heating
The tester automatically pulls glow wire away from specimen once preset heating time expires in accordance with GB/T 4706.1‑2024 and related standards. This function prevents extra thermal damage and abnormal flame spread interference to improve test safety and data authenticity.

Intelligent Functions for Error Reduction and Data Improvement

Full automatic control of ZRS‑3H glow-wire tester minimizes manual intervention to realize traceable and accurate test records.
• Automatic timing: adjustable heating duration from 0.1s to 999.9s with ±0.1s precision; timer starts synchronously upon specimen contact and stops automatically at set time;
• Auto ignition/extinguish time recording: system captures flame appearance and disappearance automatically within 0.1s~999.9s with optional manual pause to eliminate human stopwatch error;
• Automatic specimen separation: glow wire retracts immediately after timing completion to prevent secondary heating damage;
• LCD touch screen plus remote control: intuitive panel and remote operation reduce operator exposure to high-temperature area;
• Robust cabinet: high-temperature coated steel structure with excellent heat and corrosion resistance suitable for long-period continuous testing.

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Main Technical Specifications of ZRS‑3H Glow-wire Tester

The specification table below shows accuracy and performance difference between ZRS‑3H (with cabinet) and ZRS‑3HS (without cabinet).

Item ZRS‑3H (with cabinet) ZRS‑3HS (without cabinet)
Temperature Range Ambient~1100℃ adjustable; accuracy ±3℃; resolution ±1℃ Same as left
Heating Duration 0.1s~999.9s, accuracy ±0.1s Same as left
Ignition/Extinguish Record 0.1s~999.9s auto record with manual pause option Same as left
Contact Pressure 0.95N±0.1N, penetration depth 7mm Same as left
Glow Wire Dimension φ4mm, Ni80/Cr20 nickel-chromium alloy Same as left
Thermocouple φ1mm armored K-type Same as left
Auto Retraction Function Available, fully compliant with standard Same as left
Operation Interface LCD touch screen + indicator + remote control Same as left
Gross Weight Approx.180kg Approx.40kg

Standard Compliance and Industrial Application Fields

Thanks to reliable overall performance, ZRS‑3H glow-wire tester is widely adopted in electronics, lighting, electrical fittings, automotive electronics, new material labs and third-party certification institutions for flammability certification and incoming quality inspection.
• Electrical & Electronics: flammability test for charger housing, appliance insulating bracket and motor thermal shield;
• Lighting Industry: evaluation of LED driver shell, lamp holder and ballast component;
• Electrical Accessories: flame resistance assessment for switch panel and cable insulation;
• Automotive Electronics: high-temperature ignition test for onboard charger casing, wire insulation and interior plastic;
• Material Laboratory: GWFI & GWIT measurement of ABS, PC, PP and flame-retardant modified plastics to support material formulation and certification.

Conclusion

LISUN ZRS‑3H is high-performance, standard-compliant and intelligent glow-wire tester developed in accordance with global latest fire safety regulations. It precisely realizes specified 960℃ glow wire temperature and 1N contact force, together with automatic timing, auto flame time logging and automatic sample separation to greatly cut down human-induced deviation and ensure repeatable and credible test results.

Featured with precise thermal control, stable contact pressure, user-friendly operation and solid mechanical structure, ZRS‑3H fully satisfies GWFI and GWIT testing requirements for R&D, QC and certification work. As critical inspection equipment for material fire safety verification, this glow-wire tester delivers standardized, accurate and efficient testing solutions for electrical, home appliance, lighting and automotive industries to secure product safety and legal market access.

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Standardized Design and Intelligent Measurement & Control Technology of Glow-wire Tester

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