Home / Products / Air Quality / Air Velocity Transmitters Air Velocity Transmitters Air Velocity Transmitters measure air velocity or volumetric flow in imperial or metric units. There are models for 3% or 5% accuracy. Series AVU Ideal for Building Automation Systems, ±5% or ±8% Full Scale AccuracyAir Velocity Transmitter ideal for a wide range of HVAC measurement and control applications. Applications include zone control in HVAC systems and clean room systems. Series AVUL 3% and 5% ModelsAir Velocity Transmitter accurate and available for a variety of needs. Measures air velocity and volumetric flow.