HS Code for Photomultiplier tube

The Photomultiplier Tube (PMT) is classified under HS code 8540.20, which specifically covers television camera tubes, image converters, image intensifiers, and other photo-cathode tubes. This classification is determined by the fundamental operating principle of the device. Unlike solid-state sensors, a PMT is a vacuum tube that utilizes the photoelectric effect combined with secondary emission to detect and amplify extremely weak signals of light. Because it relies on a vacuum environment and a series of dynodes (electrodes) to multiply electrons, it falls squarely within the category of thermionic, cold cathode, or photo-cathode valves and tubes of heading 8540. The specific subheading 8540.20 is designated for tubes that convert an optical image or light signal into an electronic signal or an intensified optical image, which is the primary function of a photomultiplier.

Products Included

• Standard head-on photomultiplier tubes
• Side-on photomultiplier tubes
• Microchannel plate (MCP) photomultiplier tubes
• High-gain dynode-based vacuum photodetectors
• Ruggedized PMTs for scintillation counting

Common Misclassification

Photomultiplier tubes are frequently misclassified under HS code 8541.42 or 8541.43, which cover photosensitive semiconductor devices like photodiodes. The critical distinction is the technology: 8541 is reserved for solid-state semiconductor components, whereas 8540 is for vacuum tube technology. Additionally, complete scintillation detectors that incorporate a PMT and a crystal may sometimes be incorrectly classified here, though they may belong in 9022 or 9030 depending on their specific application in medical or physical analysis.

FAQ

What is the HS code for Photomultiplier tube?

The primary HS code for a standalone photomultiplier tube is 8540.20.

Is a silicon photomultiplier (SiPM) classified under 8540.20?

No, a Silicon Photomultiplier (SiPM) is a semiconductor-based device and is classified under heading 8541, typically 8541.49, because it does not utilize vacuum tube technology.