Optical instruments and apparatus
Instruments and apparatus for physical or chemical analysis (for example, polarimeters, refractometers, spectrometers, gas or smoke analysis apparatus); instruments and apparatus for measuring or checking viscosity, porosity, expansion, surface tension or the like; instruments and apparatus for measuring or checking quantities of heat, sound or light (including exposure meters); microtomes; parts and accessories thereof: > Gas or smoke analysis apparatus: > Other: > Optical instruments and apparatus
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified under HTS 9027.10.40.00
Portable Optical Smoke Density Meter
Handheld device using light obscuration to measure smoke density and particulate matter in ambient air or vehicle exhaust. Meets HTS 9027.10.40.00 criteria as optical apparatus for smoke/gas analysis.
Biogas Optical Methane Analyzer
Fixed installation analyzer using laser spectroscopy for methane, CO2, and H2S measurement in anaerobic digesters. Classifies under HTS 9027.10.40.00 for optical biogas composition analysis.
Cavity Ring-Down Spectroscopy Trace Gas Analyzer
Ultra-sensitive optical spectrometer measuring ppb levels of water vapor, isotopes, and greenhouse gases using laser cavity decay time. HTS 9027.10.40.00 for advanced optical gas analysis.
Raman Gas Analyzer for Explosive Detection
Laser Raman spectroscopy system identifying explosive vapors and chemical agents through molecular fingerprint scattering. HTS 9027.10.40.00 covers optical gas/plume analysis.
Photoacoustic Gas Monitor
Infrared photoacoustic spectroscopy analyzer detecting multiple trace gases through sound wave generation in modulated light-absorbed gas. Optical modulation classifies under HTS 9027.10.40.00.
Quantum Cascade Laser HCl Analyzer
QCL-based optical analyzer for continuous hydrogen chloride monitoring in incinerator and semiconductor process gases. Mid-IR laser absorption qualifies for HTS 9027.10.40.00.
Optical Biogas Quality Analyzer
Complete station measuring CH4, CO2, O2, H2S using NDIR and electrochemical sensors for renewable energy plant quality control. Optical components dominate HTS 9027.10.40.00 classification.
Nondispersive Infrared (NDIR) CO2 Analyzer
This optical instrument uses infrared spectroscopy to measure carbon dioxide concentrations in gas samples for environmental monitoring and HVAC systems. It falls under HTS 9027.10.40.00 as a gas analysis apparatus employing optical detection principles for precise CO2 quantification.
FTIR Gas Analyzer for Stack Emissions
Fourier Transform Infrared spectrometer designed for continuous monitoring of multiple gases in industrial exhaust stacks using optical interferometry. Classified under HTS 9027.10.40.00 for its optical analysis of gas composition in compliance monitoring.
Tunable Diode Laser Gas Analyzer
TDLAS instrument using laser absorption spectroscopy for trace gas detection of ammonia, HCl, and VOCs in process streams. Optical principle qualifies it for HTS 9027.10.40.00 gas analysis classification.
UV-DOAS Flue Gas Monitor
Ultraviolet Differential Optical Absorption Spectroscopy system for measuring SO2, NO2, and O3 in power plant flue gases across open paths. HTS 9027.10.40.00 applies to this optical remote sensing apparatus.
Infrared Process Gas Chromatograph
Online analyzer combining infrared detection with chromatography for hydrocarbon process stream monitoring in refineries. Optical IR detector qualifies under HTS 9027.10.40.00 despite chromatographic separation.
Automotive Optical Exhaust Gas Analyzer
Benchtop five-gas analyzer using NDIR for CO, CO2, HC and electrochemical O2 for vehicle emissions testing. Optical components justify HTS 9027.10.40.00 classification.
Laboratory FTIR Multi-Gas Analyzer
Research-grade Fourier Transform Infrared analyzer for simultaneous identification of 30+ gases in air samples. HTS 9027.10.40.00 covers laboratory optical gas analysis instruments.
Open-Path Laser VOC Monitor
Long-path laser dispersion system for perimeter monitoring of volatile organic compounds around chemical facilities. Optical remote sensing qualifies for HTS 9027.10.40.00.