Find HS Code and trade information for thermohygrometer

Thermohygrometer

A thermohygrometer is a scientific instrument used to measure both temperature and humidity. The name is a combination of "thermo-" (relating to temperature) and "hygro-" (relating to humidity), and "meter" (meaning to measure). These instruments are crucial in fields requiring precise environmental control and monitoring.

Materials & Construction

Thermohygrometers utilize various materials depending on the specific type and intended accuracy. Common components include:

• Temperature Sensor: Historically, mercury-in-glass thermometers were used. Modern instruments employ thermistors, resistance temperature detectors (RTDs), or thermocouples for electronic temperature measurement.
• Humidity Sensor: These vary significantly. Common types include:
  • Hair Sensors: Traditionally, human or animal hair was used, as its length changes with humidity.
  • Psychrometers: Utilize wet-bulb and dry-bulb thermometers.
  • Capacitive Sensors: Utilize a polymer film whose dielectric constant changes with humidity.
  • Resistive Sensors: Employ a humidity-sensitive resistor.
• Display/Readout: Analog instruments use dials and pointers. Digital instruments feature LCD or LED displays.
• Housing: Typically constructed from plastic, metal, or a combination thereof, designed to protect the internal components and allow for airflow.

Purpose & Function

The primary purpose of a thermohygrometer is to provide simultaneous readings of air temperature and relative humidity.

• Temperature Measurement: Measures the degree of hotness or coldness of the air. Readings are typically provided in Celsius (°C) or Fahrenheit (°F).
• Humidity Measurement: Determines the amount of water vapor present in the air, expressed as relative humidity (RH) as a percentage. RH indicates the amount of moisture relative to the maximum amount the air can hold at a given temperature.

The instrument functions by utilizing the differing physical properties of materials in response to changes in temperature and humidity. The readings are then converted into a displayable format.

Usage Scenarios

Thermohygrometers are employed across a wide range of applications:

• Meteorology: Essential for weather forecasting and climate monitoring.
• HVAC (Heating, Ventilation, and Air Conditioning): Used to control and optimize indoor climate for comfort and energy efficiency.
• Museums & Art Conservation: Maintaining stable temperature and humidity levels is critical for preserving sensitive artifacts.
• Greenhouses & Horticulture: Optimizing growing conditions for plants.
• Pharmaceutical & Food Storage: Ensuring proper storage conditions to maintain product quality and safety.
• Industrial Processes: Monitoring and controlling environmental conditions in manufacturing settings.
• Home Use: Monitoring indoor comfort levels and preventing mold growth.

Common Types

• Analog Thermohygrometers: Utilize mechanical components (hair sensors, bimetallic strips) and dials for display. Less accurate but often more affordable.
• Digital Thermohygrometers: Employ electronic sensors and digital displays. More accurate and often include features like data logging and min/max memory.
• Psychrometers (Wet-Bulb/Dry-Bulb): Measure humidity by comparing the temperature of a dry bulb and a wet bulb thermometer. Requires ventilation and calculation of relative humidity.
• Data-Logging Thermohygrometers: Record temperature and humidity data over time, allowing for analysis and trend monitoring.
• Wireless Thermohygrometers: Transmit data remotely, enabling real-time monitoring from a distance.

Thermohygrometer Classification and Tariff Information

A thermohygrometer is an instrument used to measure both temperature and humidity. Based on its function, it falls under the category of floating instruments and similar devices used for measuring temperature and humidity.

Here are the relevant HS codes based on the provided reference material:

• 9025805000: This HS code covers “Hydrometers and similar floating instruments, thermometers, pyrometers, barometers, hygrometers and psychrometers, recording or not, and any combination of these instruments; parts and accessories thereof: Other instruments: Other”. This is a broad category encompassing various measuring instruments, including thermohygrometers that are not specifically electrical.

  • 90: Chapter 90 covers “Instruments and apparatus which measure, check, weigh or count.”
  • 25: Heading 9025 specifically relates to “Hydrometers and similar floating instruments, thermometers, pyrometers, barometers, hygrometers and psychrometers.”
  • 80: Subheading 9025.80 covers “Other instruments”.
  • 50: Subheading 9025.80.50 further specifies “Other”.
  • Total Tax Rate: 39.1% (Base Tariff: 1.6%, Additional Tariff: 7.5%, Post-April 2, 2025 Additional Tariff: 30%).

• 9025801000: This HS code covers “Hydrometers and similar floating instruments, thermometers, pyrometers, barometers, hygrometers and psychrometers, recording or not, and any combination of these instruments; parts and accessories thereof: Other instruments: Electrical”. This applies to thermohygrometers that incorporate electrical components for measurement or recording.

  • 90: Chapter 90 covers “Instruments and apparatus which measure, check, weigh or count.”
  • 25: Heading 9025 specifically relates to “Hydrometers and similar floating instruments, thermometers, pyrometers, barometers, hygrometers and psychrometers.”
  • 80: Subheading 9025.80 covers “Other instruments”.
  • 10: Subheading 9025.80.10 further specifies “Electrical”.
  • Total Tax Rate: 56.7% (Base Tariff: 1.7%, Additional Tariff: 25.0%, Post-April 2, 2025 Additional Tariff: 30%).

According to the provided reference material, the HS code options related to 'thermohygrometer' are limited, with only the following 2 found.