Vacuum Photodiode Tube
S-4 response vacuum photodiode tube with Cs-O-Ag photocathode for UV light detection in spectrophotometers, featuring fast response time (<2ns) and high radiant sensitivity. Operates without electron multiplication for direct photocurrent generation. HTS 8540.89.00.60 covers this as a light-sensing vacuum tube with photocathode.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If semiconductor photodiode version
PIN or avalanche photodiodes without vacuum envelope classify under Chapter 85 semiconductors.
If mounted in laser power meter housing
Photodiodes for laser applications become parts of laser instruments under 9013.
If integral to spectrophotometer
Optical detector tubes permanently installed in instruments classify as instrument parts.
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Import Tips & Compliance
• Specify spectral response curve (160-650nm) to distinguish from semiconductor photodiodes
• Base material certificates required if containing controlled substances like cesium compounds
• Avoid packaging with optical mounts that could trigger instrument parts classification
Related Products under HTS 8540.89.00.60
Photomultiplier Tube R928
The Hamamatsu R928 is a head-on type photomultiplier tube featuring a semi-cylindrical photocathode that provides high sensitivity to low light levels. It amplifies photoelectrons through a series of dynodes to produce a measurable electrical signal, making it ideal for scintillation counting and spectroscopy. Classified under HTS 8540.89.00.60 as a light-sensing tube due to its photocathode design for detecting and amplifying faint light signals.
Photocathode Tube for Night Vision
This S-25 spectral response photocathode tube converts available light into electrons via photoelectric effect, amplifying them for low-light imaging in night vision devices. It features a gallium arsenide photocathode optimized for near-infrared sensitivity. Falls under HTS 8540.89.00.60 as a light-sensing photocathode tube, distinct from complete night vision cameras.
Image Intensifier Tube Gen 3
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Scintillation Photomultiplier Tube
High-quantum-efficiency photomultiplier tube paired with NaI(Tl) scintillation crystals for gamma ray spectroscopy in nuclear medicine. Features 10 dynode stages and bialkali photocathode sensitive to 300-650nm emission spectrum. Classified as light-sensing tube under 8540.89.00.60 for its vacuum tube electron multiplication technology.
Channeltron Electron Multiplier Tube
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Mercury Arc Light Sensor Tube
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