Of seismographs
Surveying (including photogrammetrical surveying), hydrographic, oceanographic, hydrological, meteorological or geophysical instruments and appliances, excluding compasses; rangefinders; parts and accessories thereof: > Parts and accessories > Of seismographs
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 9015.90.01.50
Seismograph Digital Sensor Module
This digital sensor module is a replaceable component specifically designed for seismographs, converting ground motion into electrical signals for earthquake detection. It falls under HTS 9015.90.0150 as a dedicated part of seismographs used in geophysical surveying. The module ensures precise measurement of seismic waves in both portable and permanent installations.
Seismograph Data Acquisition Unit
A compact data acquisition unit that interfaces sensors with recording systems in seismographs, capturing and digitizing seismic data in real-time. Classified under HTS 9015.90.0150 as an essential accessory for geophysical seismograph instruments. It supports high-sample-rate recording critical for earthquake analysis.
Seismograph Timing Synchronization Board
This circuit board provides GPS-synchronized timing for multi-station seismograph networks, ensuring accurate earthquake event correlation. It qualifies for HTS 9015.90.0150 as a specialized accessory dedicated to seismograph operations in geophysical monitoring. Precision timing is vital for seismic array deployments.
Seismograph Strong Motion Accelerometer
A high-g accelerometer designed for seismographs to measure intense ground accelerations during strong earthquakes. Falls under HTS 9015.90.0150 as a core sensor part for geophysical seismograph appliances. It captures data for engineering seismology and structural safety assessments.
Seismograph Anti-Aliasing Filter Module
This analog filter module prevents signal distortion in seismograph digitization by removing high-frequency noise before sampling. Classified in HTS 9015.90.0150 as a seismograph-specific accessory for accurate geophysical data acquisition. Essential for clean broadband seismic recordings.
Seismograph Power Supply Conditioner
A ruggedized power conditioner for seismographs, providing stable low-noise DC power in remote field deployments. HTS 9015.90.0150 applies as it's principally designed for geophysical seismograph reliability. Prevents data corruption from power fluctuations in continuous monitoring.
Seismograph Broadband Velocity Sensor
Advanced broadband sensor measuring ground velocity across wide frequency ranges for seismographs in earthquake research. Under HTS 9015.90.0150 as a key geophysical instrument part. Enables detection of microseisms to major events.
Seismograph Field Deployment Case
Protective weatherproof case with mounting hardware for deploying seismographs in remote geophysical surveys. HTS 9015.90.0150 classification as dedicated seismograph accessory. Facilitates long-term unattended operation.
Seismograph Calibration Signal Generator
Portable generator producing known seismic waveforms for in-situ seismograph calibration and testing. Fits HTS 9015.90.0150 as seismograph maintenance accessory in geophysical applications. Ensures instrument accuracy per seismic network standards.
Seismograph Mass-Centered Feedback Controller
Active feedback controller maintaining sensor mass centering in force-feedback seismographs for stable long-period recording. HTS 9015.90.0150 as specialized geophysical part. Critical for observatory-grade installations.