If a parameter is important you should measure it directly.

Information:

This ensures that the control is based on a closed loop. Typical true flow feedback air flow measurement applications are:

•Fan tracking

•Lab pressurization control

•Isolation room pressure control

•Outdoor air quantity monitoring

•Volumetric air flow control

Features:

Theory of Vortex shedding air flow measurement:

•Bluff body is a trapezoidal shaped strut

•A tube aligns air flow across bluff body

•Pressure pulses at sides of bluff body are sensed

•Multiple sensors across duct are averaged

Advantages of Vortex shedding air flow measurement:

•Primary signal directly proportional to velocity (1 to 1 relationship)

•Does not require compensation for temperature, density and humidity changes

•Linear primary signal

•True velocity averaging

•Not affected by dust/dirt

•Self cleaning

•Recalibration not required