Limited Oxygen Index Tester

TESTech Instrument (Suzhou) Technologies is one of the leading manufacturers and suppliers of limited oxygen index tester in China. Welcome to wholesale premium test equipment at competitive price from our factory. If you have any enquiry about quotation, please feel free to email us.

The limited oxygen index tester is suitable for determining the minimum oxygen concentration required to just sustain specimen combustion in a mixed oxygen and nitrogen atmosphere under specified test conditions. This analyzer uses an imported paramagnetic oxygen sensor together with imported mass flow controllers to provide accurate and durable measurement.

It is used to evaluate the combustion performance of homogeneous solid materials, laminated materials, foam materials, sheets, films, textiles, fiber-reinforced plastics, and rubber under specified conditions.

• Oxygen concentration measurement range: 0-100 percent.
• Oxygen concentration accuracy: ±0.1 percent.
• Nitrogen mass flow controller range: 1.0-15.0 L/min, accuracy 2 percent.
• Oxygen mass flow controller range: 1.0-15.0 L/min, accuracy 2 percent.
• Oxygen sensor response time: <2 s.
• Overall equipment response time: <10 s including concentration setting, flow control, gas mixing, and discharge through the combustion tube.
• Gas flow inside the combustion tube: 40 mm/s ±2 mm/s, concentration adjustment accuracy ±0.1 percent.
• Gas flow at top of combustion tube: 90 mm ±10 mm/s.
• Portable igniter with downward spray 16 ±4 mm and adjustable flame 10-30 mm.
• Measurement time up to 5 minutes, accuracy ±0.5 s.
• Dual flow meter and pressure gauge device accuracy ±1 percent.
• Working pressure: 0.1 MPa.
• Glass tube height 500 mm, inner diameter 80 mm.

• Imported paramagnetic oxygen concentration sensor with no service life limitation, unlike electrochemical sensors.
• Equipped with high-temperature-resistant quartz glass tube with outlet inner diameter 40 mm.
• Specimen holders provided for both self-supporting and non-self-supporting samples.
• Mass flow controllers automatically adjust oxygen and nitrogen flow according to the set concentration.
• Patented gas flow mixing control unit equipped with nitrogen and oxygen mass flow controllers for precise gas flow control.
• PLC color touch screen automatically adjusts oxygen concentration after the target value is set.
• Patented gas mixing chamber ensures more accurate oxygen concentration determination and more complete mixing of oxygen and nitrogen.
• Color LCD touch screen displays flow, time, and test results in real time.
• Dual flow meter and pressure gauge device accuracy ±1 percent.
• Special dedicated igniter for easy operation.

• PLC with touch screen provides a higher degree of test automation.
• After setting the oxygen concentration value, the system automatically adjusts oxygen concentration.
• Key electrical components use imported brands for accuracy, reliability, and durability.
• Automatic calibration system prevents oxygen sensor drift caused by environmental effects from influencing test results.
• One-button automatic sensor calibration avoids the inconvenience of using standard calibration gas regularly.
• Equipped with safety protection circuit.

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