Product Overview

Core Product Competitive Advantages

1. Touchscreen One-Click Oxygen Concentration Auto Calibration
   Intuitive full-color touch operation interface, users only input target oxygen proportion value; the built-in program automatically adjusts nitrogen-oxygen mixed gas flow, and sends buzzer reminder once concentration stabilizes to the set value. Operators no longer repeatedly tweak pressure valves and manually calculate mixing ratios, drastically cutting single-test preparation time and lowering human error sources.
2. Closed-Loop Stepping Proportional Valve Constant Flow Control
   Equipped high-precision stepping proportional flow valve with real-time closed-loop feedback algorithm. If oxygen concentration drifts during long combustion observation, the system instantly fine-tunes gas flow to restore target parameters, solving the defect of traditional equipment unable to dynamically correct concentration deviation mid-test, greatly boosting parallel test data repeatability. Gas regulation precision reaches 0.001MPa/min with rapid response within 5 seconds.
3. High-Temperature Transparent Standard Combustion Tube
   Adopts high-strength heat-resistant borosilicate glass combustion cylinder, standard inner diameter 75mm, effective height 480mm, consistent with international standard size. Uniform annular gas outlet structure ensures oxygen-nitrogen mixture evenly fills the whole cylinder without local gas stratification, guaranteeing stable combustion environment for vertical clamped specimens.
4. Universal Vertical Self-Support Specimen Fixture
   Dedicated fixed clamping stand holds test strips vertically without auxiliary support, compatible with rigid plastics, thin films and laminated composite samples of different thicknesses. Clamping gap can be fine-tuned to avoid specimen tilt during ignition, ensuring consistent flame propagation observation standards for every group of samples.
5. Integrated Anti-Corrosion CNC Cabinet & Complete Safety Protection

   Machine shell processed by integrated CNC cutting with electrostatic anti-rust paint coating, resistant to long-term laboratory chemical gas corrosion. Internal electrical circuit is equipped with overload, short-circuit dual protection modules; abnormal power supply automatically cuts off gas control circuit to eliminate equipment burnout risks during unattended testing.
6. Compact Small Footprint Desktop Layout
   Integrated all-in-one structure only occupies 0.6 square meters of laboratory countertop space, total net weight merely 24kg, easy to move between different test stations. Standard single-phase 220V power supply access, no special industrial power transformation required for factory QC rooms and university labs.

Complete Technical Parameter Specification Table

Standard Complete Test Operation Workflow

1. Equipment Pre-Inspection & Gas Connection
   Connect qualified oxygen and nitrogen gas cylinders to the equipment inlet, adjust cylinder pressure to 0.25~0.5MPa; power on touch control panel and check circuit overload protection function status.
2. Target LOI Parameter Setting
   Input the pre-estimated oxygen concentration value on the touch screen, start automatic gas mixing program, wait for buzzer stable prompt before proceeding with specimen loading.
3. Specimen Vertical Clamping
   Cut raw material into standard test strips, fix the sample vertically on the central fixture of combustion tube, ensure the specimen is centered without deflection.
4. Ignition & Combustion Observation
   Use standard ignition source to contact the top of the specimen, record continuous combustion duration and flame spread length; if concentration drifts, the system automatically adjusts gas flow without manual intervention.
5. LOI Critical Value Determination
   Gradually adjust oxygen concentration up and down following standard staircase test method, record the minimum oxygen percentage that can sustain continuous combustion to get final limiting oxygen index result.
6. Post-Test Shutdown & Tube Cleaning
   Cut off gas supply first, power down the control system after the combustion tube fully cools, wipe soot residues on the inner glass wall for next batch testing.

Wide Industrial Application Scenarios

Modified Plastic & Masterbatch Factories

Textile & Nonwoven Labs

Construction Fireproof Material Enterprises

Rubber & Elastomer Manufacturers

University & Third-Party Testing Institutions

Standard Factory Full Delivery Kit

1. KR-712B automatic limiting oxygen index tester main control cabinet + combustion tube assembly
2. High-precision stepping proportional gas flow valve dual gas circuit system
3. Standard vertical self-support specimen clamping fixture set
4. High-temperature transparent borosilicate combustion cylinder and ignition auxiliary tool
5. Full-color touch intelligent control terminal with built-in concentration auto-correction program
6. Gas pressure regulating joint and complete connecting pipeline fittings
7. Multilingual operation manual aligned with LOI international testing standards
8. Factory gas flow & concentration calibration inspection qualification certificate

Global Distributor & After-Sales Support

English Overlay Text For All Product Pictures