Der JYZS-20 Fully Automatic Oxygen Index Tester is a top-tier, touch-screen-controlled flammability testing system designed to determine the Limiting Oxygen Index (LOI / OI) of polymers, Kunststoffe, Textilien, Gummi, and building components. Engineered in strict compliance with ISO 4589-2, ASTM D2863, BS 2782-1 (Verfahren 141), NES 715, and national standards GB/T 2406 Und GB/T 5454, this apparatus provides automated gas mixing without manual needle-valve tweaking.
Featuring a stepper-driven proportional valve with closed-loop concentration correction, an imported high-precision oxygen sensor (0–100% range, ±0.1% resolution), a standard 500 mm × ≥75 mm glass combustion column, and automated 40 ± 2 mm/s gas flow velocity control, das ist fortgeschritten Automated Limiting Oxygen Index (LOI) Gerät eliminates measurement drift and ensures uncompromised data integrity for polymer producers, cable manufacturers, und externe Prüflabore.
Fully Automatic Oxygen Index Tester Compliance & Standards
This closed-loop automated LOI testing system enables accredited laboratories to perform formal limiting oxygen index evaluations across global standards:
| Standardcode |
Standardtitel & Umfang |
Primäre Testanwendung |
| ISO 4589-2 |
Plastics — Determination of burning behaviour by oxygen index — Part 2: Ambient-temperature test |
International benchmark method for evaluating the flammability of rigid and flexible polymers at room temperature |
| ASTM D2863 |
Standard test method for measuring the minimum oxygen concentration to support candle-like combustion of plastics |
North American standard for determining oxygen index across plastic resins, insulating compounds, and films |
| BS 2782-1 (Verfahren 141) & NES 715 |
Methods of testing plastics — Oxygen index & Naval Engineering Standard for material flammability |
British and military-grade qualification for defense, naval vessel interior materials, and industrial plastics |
| GB/T 2406 & GB/T 5454 |
Plastics and Textiles — Determination of burning behaviour by oxygen index |
Mandatory Chinese national standards for plastic sheet, cellular foam, cable jacketing, and textile flame retardancy |
Technological Features of JYZS-20 Automatic LOI Tester
- Closed-Loop Automatic Concentration & Flow Control: Touchscreen input instantly commands a stepper-driven proportional valve to adjust O₂/N₂ ratios. The system automatically corrects real-time oxygen drift during combustion.
- High-Precision Imported Oxygen Sensor: Direct digital display of O₂ percentage with ±0.1% resolution and fast response time (<5 S), eliminating complex manual calculations.
- Standardized Column Flow & Velocity Dynamics: Maintains a constant gas velocity of 40 ± 2 mm/s inside the 500 mm (H) × ≥75 mm (ID) glass combustion column across 0–20 L/min flow ranges.
- Versatile Dual Specimen Mounting Systems: Includes both self-supporting rigid clamps (for thick plastics, boards, and timber) and non-self-supporting frame clamps (for thin films, flexible foams, and textiles).
- Precision Propane/Butane Ignition System: Fitted with an Ø2 ± 1 mm metal burner nozzle capable of delivering an adjustable 5 mm bis 60 mm ignition flame (standard setting: 16 ± 4 mm).
Technical Specifications of JYZS-20 Automatic Oxygen Index Tester
| Geltende Teststandards |
ISO 4589-2, ASTM D2863, BS 2782-1, NES 715, GB/T 2406, GB/T 5454 |
| Oxygen Concentration Measurement Range |
0 Zu 100% O₂; Auflösung: ±0.1%; Response time: <5 S |
| Glass Combustion Column Dimensions |
Internal diameter ≥ 75 mm; Höhe: 500 mm |
| Gas Flow Velocity in Column |
40 ± 2 mm/s; Total flow adjustment: 0–20 L/min (0–1200 L/h) |
| Igniter Nozzle & Flame Geometry |
Nozzle inner diameter: Ø2 ± 1 mm; Flame length: 16 ± 4 mm (adjustable 5–60 mm) |
| Required Gas Supply (User-Provided) |
Gaseous O₂ and N₂ (Reinheit >99%); Cylinder pressure regulators: 0.2 MPa; Operating inlet pressure: 0.1–0.15 MPa |
| Specimen Clamping Options |
Self-supporting clamp (rigid samples) & Non-self-supporting frame (flexible/textile samples) |
| Operating Conditions & Leistung |
Ambient temp: -10 °C to 45 °C; RH <85%; Wechselstrom 220 V ± 10%, 50 Hz, 100 W |
Systemarchitektur & Testing Workflow of JYZS-20 Oxygen Index Tester
Standardisierter Testworkflow:
- Mount the rigid or flexible specimen into the designated holder and position it vertically along the axis of the combustion column.
- Select the target oxygen concentration (z.B., 21.0%) on the full-color touchscreen.
- The closed-loop system automatically modulates the proportional valve to adjust O₂/N₂ mixing until flow stabilizes at 40 ± 2 mm/s.
- Ignite the propane igniter (flame length 16 ± 4 mm) and insert it from the top of the column to ignite the upper tip of the specimen.
- Observe flame propagation and burning time; step the oxygen concentration up or down until the precise Limiting Oxygen Index (LOI) threshold is established.
Zielkundenanwendungen:
- Polymer resin manufacturers, masterbatch formulators, and compounders (PP, ABS, PVC, PE, PU).
- Wire and cable jacketing, electrical insulation, and connector component manufacturers.
- Flame-retardant textile mills, technical fabrics, and protective garment testing centers.
- Third-party fire research institutes and ISO 17025 certified testing laboratories.
JYZS-20 Fully Automatic Oxygen Index Tester FAQ
Q1: What is the main advantage of a fully automatic oxygen index tester over conventional manual models?
A: Traditional testers require manual tweaking of rotor flowmeters or needle valves, which causes drift during combustion. The JYZS-20 utilizes a stepper-driven proportional valve and closed-loop control to automatically maintain exact target oxygen concentrations and column gas velocity without manual intervention.
Q2: What is Limiting Oxygen Index (LOI) and why is it important?
A: LOI represents the minimum concentration of oxygen in an oxygen/nitrogen mixture that will support candle-like combustion of a material. Since ambient air contains ~20.9% oxygen, materials with an LOI > 21% are harder to ignite in air, and materials with an LOI > 28% are considered flame-retardant.
Q3: Can this device test both rigid plastics and soft fabrics or thin films?
A: Ja. The JYZS-20 includes two specialized holders: a self-supporting clamp for rigid plastics/boards and a non-self-supporting frame clamp for thin films, flexible foams, and textiles.
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