Working Principles and Selection Criteria for Anemometers: Comparing Thermal, Vane, and Ultrasonic Types

An anemometer is a professional instrument for measuring air velocity, widely used in HVAC system testing, environmental monitoring, and industrial ventilation. Current models are primarily available in three types: thermal, vane, and ultrasonic, each with its own advantages and limitations.

Thermal Anemometer: The Top Choice for Low-Speed Airflow Measurement

Thermal anemometers measure wind speed based on heat transfer principles by calculating the cooling rate of a heated element. Their key advantages include strong low-speed measurement capabilities, detecting airflows as low as 0.05 m/s, and fast response times (typically under 1 seconds).

Ideal for cleanroom airflow testing, ventilation duct velocity measurement, and indoor air quality assessment. The ET-975P thermal anemometer by Lexin Electronics (Baiantu) features a range of 0-30 m/s, resolution of 0.01 m/s, and is optimized for HVAC system commissioning.

## Vane Anemometer: A Reliable Choice for Medium to High Wind Speeds

The vane anemometer calculates wind speed based on the rotational speed of its impeller. It features a simple design and high durability. Its measurement range is typically 0.5-30 m/s, with an accuracy within ±2%.

Use Cases: Outdoor wind speed measurement, fan performance testing, agricultural weather monitoring. Limitation: Difficult to start at low wind speeds; not suitable for measuring breezes below 0.5 m/s.

## Ultrasonic Anemometer: A Premium Solution for High-End Applications

The ultrasonic anemometer calculates wind speed based on the time difference of ultrasound propagation through air. With no moving parts, it requires minimal maintenance. Accuracy reaches ±1%, with a response time under 0.1 seconds.

Ideal for weather stations, wind energy assessment, and scientific research. Drawback: high cost, typically exceeding $10,000.

Selection Recommendations

Budget-limited, range 0.5-30 m/s: Choose a vane anemometer. Need to measure low wind speeds (0.05-5 m/s): Choose a hot-wire anemometer. High precision with no maintenance required: Choose an ultrasonic anemometer.

Leixin Electronic Technology offers two series of anemometers—hot-wire and vane types—covering all scenarios from HVAC commissioning to industrial ventilation.