The ASTM D2863 and ISO 4589-2 standards both describe the Limiting Oxygen Index (LOI) test method, which measures the minimum concentration of oxygen required to sustain combustion of a material. While the two standards are similar, there may be some differences in the specific test procedures and parameters.

The instrument used to perform the Limiting Oxygen Index (LOI) test typically includes the following components:

1. Combustion chamber: A vertical chamber where the sample is placed and burned under controlled conditions.

2. Oxygen control system: A mechanism for controlling and adjusting the oxygen concentration within the combustion chamber.

3. Ignition system: A device that initiates the combustion of the sample, often using a small flame or spark.

4. Gas flow system: A system for supplying the combustion chamber with a mixture of oxygen and other gases, such as nitrogen or carbon dioxide.

5. Oxygen concentration measurement system: Sensors or analyzers that monitor and measure the oxygen concentration within the combustion chamber.

6. Data recording system: Equipment for capturing and recording the test parameters and results, such as the oxygen concentration at which the sample ceases to burn.

The specific design and configuration of the instrument may vary depending on the manufacturer and the specific requirements of the standard being followed (ASTM D2863 or ISO 4589-2). It is important to consult the relevant standard and follow the prescribed procedures to ensure accurate and consistent testing.

It's worth noting that specific instrument details and availability might have changed since my knowledge cutoff in September 2021. It's always recommended to refer to the latest versions of the standards and consult with equipment suppliers for up-to-date information on the instruments used for the Limiting Oxygen Index test.