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The velocity of an air stream in a duct is not uniform over the cross section of the duct. This is because friction against duct walls causes the air velocity to be lower near the sides than the velocity in the center, creating a parabolic velocity profile. Continue reading “Duct Traversing for Average Air Velocity and Air Volume”
Dwyer Instruments offers a multitude of sensors for monitoring air velocity in HVAC systems. Some of this instrumentation has a simple construction (Pitot tubes, for example) while others are more complex, such as hot-wire anemometers.
The initial term and first “hot-wire anemometer” was developed back in 1914 by Louie Vesso King. He is also accredited for King’s Law, which mathematically describes heat transfer in air flows using a heated wire. As the air moves over the wire, it causes a loss of temperature in the wire and removes some of the wire’s heat energy. Continue reading “The Basics of Air Velocity Sensors”
The Dwyer team recently released the Series MSX Pro Magnesense® Differential Pressure Transmitter, which meets stringent industry standards with innovative global product design. This series is ideal for monitoring building control applications, and also utilizes enhanced accuracy and stability for use in high performance, critical environments. Continue reading “Product Highlight: Series MSX Pro Magnesense® Differential Pressure Transmitter”
There are two common ways to measure air velocity: by using pressure-based instrumentation or by using temperature-based instrumentation. Before we discuss the different technologies available for measuring velocity pressure, it is important to understand the basics of air velocity.
The Dwyer team recently released the latest model in our line of air velocity transmitters, the Series AVLV. This series is ideal for measuring low air velocity or volumetric air flow in applications such as: clean room systems, pharmaceutical buildings, variable air volume systems, and building ducts. Continue reading “[New Product Highlight] Air Velocity Transmitter | Series AVLV”