Combustible gas alarm classification confirmed under Heading 8531.10, not as measuring or analytical instruments.

A combustible gas detector/alarm was held classifiable as electric sound or visual signalling apparatus under Heading 8531.10 of the Customs Tariff Act, 1975. The device functioned only to detect combustible gas and trigger an alarm when the gas level exceeded a permissible limit; it did not measure, analyse, or check flow, pressure, composition, or any other physical or chemical attribute of the gas. The HSN explanatory notes supported treatment of gas alarm devices with detector and sound or visual alarm under Heading 8531, rather than as measuring or analytical instruments under Headings 9026.80 or 9027.10.

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Issues: Whether a combustible gas detector/alarm was classifiable under Heading 8531.10 of the Customs Tariff Act, 1975 as electric sound or visual signalling apparatus, or under Headings 9026.80 or 9027.10 as measuring or analytical instruments.

Analysis: The goods were found to function only as a detector and alarm to warn when combustible gas exceeded a permissible level. They did not measure the flow, level, pressure, composition, or any physical or chemical attribute of the gas, nor did they perform analysis or checking of such variables. The HSN explanatory notes supported classification of gas alarm devices with detector and sound or visual alarm under Heading 8531.

Conclusion: The goods were correctly classifiable under Heading 8531.10 of the Customs Tariff Act, 1975 and not under Headings 9026.80 or 9027.10; the Revenue's contention succeeded.

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