Customs classification of gas detection sensor confirmed under alarm-system heading; exemption notification unavailable.

An imported lower explosive limit catalytic sensor, supplied as part of a gas detection and monitoring system, was treated as a component of that system rather than an instrument for physical or chemical analysis. Because the sensor did not independently measure or check gas quantities within Heading 90.27, and the complete gas detection system itself was not classifiable under that heading, its parts could not fall under sub-heading 9027.90. The proper classification was therefore Heading 8531.90 as a part of an alarm or gas detection system. As the goods were not classifiable under 9027.90, Notification No. 172/89-Cus. was not available.

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Issues: Whether the imported sensor lower explosive limit catalytic was correctly classifiable under Heading No. 8531.90 of the Customs Tariff as a part of an alarm or gas detection and monitoring system, or under Heading No. 9027.90 as an instrument or apparatus for physical or chemical analysis, and whether Notification No. 172/89-Cus. dated 29-5-1989 was applicable.

Analysis: The imported goods were admittedly a sensor forming part of the gas detection and monitoring system manufactured by the appellant. Viewed independently, the sensor was not an instrument or apparatus for physical or chemical analysis and did not itself measure or check quantities of gas within the meaning of Heading No. 90.27. Since the complete gas detection and monitoring system was not classifiable under Heading No. 90.27, its parts could not be brought under sub-heading No. 9027.90. The sensor was instead a component of the gas detection system, which was classifiable under Heading No. 85.31, and the supporting classification also accorded with the explanatory notes distinguishing gas alarms from gas analysis apparatus. As the goods were not classifiable under sub-heading No. 9027.90, the exemption notification for that heading was not available.

Conclusion: The sensor was correctly classifiable under Heading No. 8531.90 and not under Heading No. 9027.90, and the exemption notification did not apply.

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