AUTOMATIC OXYGEN INDEX HIGH TEMPERATURE (EA05) - noselab

Cod: 431003Standard: ISO 4589-3, ASTM D 2863.

Apparatus for determining the Oxygen Index value, for high temperatures determinations. The management of the test is obtained by reading directly from Colour Touch screen 7".

This test method may be used to measure and describe the properties of materials, products, or assemblies in response to heat and flame under controlled laboratory conditions. The oxygen percentage is detected by a paramagnetic transducer and the combustion occurs inside the glass column.

The ISO 4589/3 describes a method for determining the minimum concentration of oxygen by percentage volume in a mixture of oxygen and nitrogen introduced at 23C 2C that will just support combustion of a material under specified test conditions, also over a range of temperatures typically between 25C and 150C (although temperatures up to 400C may be used).

The ISO 4589/3 also describe a method for determining the temperature at which the Ol of the small vertical test specimen is 20.9 °C. The temperature is monitored up to 400C both during preheating of the gaseous mixture and inside the column through PID temperature control. This method is not applicable to materials having an Ol value of less than 20.9 at 23C.

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FEATURES:
OTHERS:

Pyrex column with built-in heating resistance complete with outer safety glass column.
Detection of O2 percentage through paramagnetic transducer (O2 accuracy <0.1%).
Direct reading measurement 7” colour display for : oxygen %,mixture flux l/min.
Automatic Control of the flow with mass flow.
Microprocessor-governed operations.
Air addition to save consumption in O2 high concentration mixtures.
Automatic calibration (0 and 100%).
Propane gas regulation and cut-off valve.
Specimen surface temperature indicator complete with detection probe.
Inconel steel detection thermocouple.
Thermoregulator for the mixture pre-heating temperature control up to 400°C.
Thermoregulator for temperature control inside the glass column.
PID regulators.

The test of material takes place in a heated column in which both the incoming gas and the gas passing up the column are heated. This has the advantage of providing information of the effect of a range of temperatures on the OI value, and gives a better understanding of the behaviour of materials over a temperature range.