Tariff classification of liquid level regulator turns on absence of audible or visual signalling function

A liquid level regulator that controlled refrigerant flow through a thermal element and solenoid valve was held not to be an electric sound or visual signalling apparatus. Heading 8531.80 applies to devices such as bells, sirens, indicator panels, and alarm systems, which must generate a visual or audible signal. Because the goods lacked the essential feature of sound or visual signalling, they did not answer that tariff description and were not classifiable under Heading 8531.80; the Revenue's appeal failed.

---

---

Issues: Whether the liquid level alarm was classifiable under Heading 8531.80 of the Customs Tariff as an electric sound or visual signalling apparatus, or under Heading 9032.89 as classified by the Commissioner (Appeals).

Analysis: The goods operated as a liquid level regulator and controlled the refrigerant flow through a thermal element and solenoid valve. They did not generate any visual or audible alarm. Heading 8531.80 covers apparatus used for electric sound or visual signalling, such as bells, sirens, indicator panels, and alarm systems. Since the goods lacked the essential feature of sound or visual signalling, they did not answer that description.

Conclusion: The goods were not classifiable under Heading 8531.80, and the Revenue's appeal failed.

---