For the program “Small Component Temperature (“SCT”) - Test Round 2021” the general routine procedure is described by the standard “Explosive atmospheres – Part 0: Equipment – General requirements” - IEC 60079-0, Edition 7.

An important aspect for the testing and assessment of the explosion protection is the test for small components, for example transistors or resistors, whose temperature exceeds that permitted for the temperature classification, described in clause 5.3.3. In the program the test sample (small component for T4 temperature classification) should be tested with flammable mixture in accordance with clause 26.5.3, to investigate if it causes temperature ignition of the flammable mixture. Therefore, the number of ignitions has been selected as the characteristic of interest which is to be compared in the program “Small Component Temperature - Test Round 2021”.

The test sample is an all-ceramic heating element made of silicon nitride and aluminium nitride. The size of the test sample is 7 mm x 3 mm x 1.5 mm (L x W x H). Due to the properties of the ceramic and the low mass, the test sample can be heated up and cooled down quickly. Furthermore, a homogeneous temperature distribution can be provided. Two samples (one of the samples serves as reserve) will be provided by the coordinator at the beginning of the program. To ensure comparability and homogeneity, all Test Samples “SCT” are completely selected, prepared and provided by the coordinator.

The time required to complete the program is approximately 3 working days.

All detailed information, descriptions and dates for the implementation of the program will be available soon in the download section below.