The 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, plastics, textiles, rubber, and building components. Engineered in strict compliance with ISO 4589-2, ASTM D2863, BS 2782-1 (Method 141), NES 715, and national standards GB/T 2406 and 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, this advanced Automated Limiting Oxygen Index (LOI) Apparatus eliminates measurement drift and ensures uncompromised data integrity for polymer producers, cable manufacturers, and third-party testing laboratories.
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:
| Standard Code |
Standard Title & Scope |
Primary Testing Application |
| 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 (Method 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 to 60 mm ignition flame (standard setting: 16 ± 4 mm).
Technical Specifications of JYZS-20 Automatic Oxygen Index Tester
| Governing Test Standards |
ISO 4589-2, ASTM D2863, BS 2782-1, NES 715, GB/T 2406, GB/T 5454 |
| Oxygen Concentration Measurement Range |
0 to 100% O₂; Resolution: ±0.1%; Response time: <5 s |
| Glass Combustion Column Dimensions |
Internal diameter ≥ 75 mm; Height: 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 (purity >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 & Power |
Ambient temp: -10 °C to 45 °C; RH <85%; AC 220 V ± 10%, 50 Hz, 100 W |
System Architecture & Testing Workflow of JYZS-20 Oxygen Index Tester
Standardized Testing Workflow:
- 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 (e.g., 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.
Target Customer Applications:
- 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: Yes. 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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