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Appendix A
Glossary
Autorange: An automatic function that measures the face-to-face distance. This
distance should be accurate to ± 6 inches and does not affect the
accuracy of the instrument.
Baseline distance: The distance of the two sensors in the
direction of the airflow. (Top view of two
sensors)
CFM: Cubic feet per minute.
Dynamic range limiting: In normal operation, analog signals are processed mathematically to
produce the “math curve”. The math curve represents the envelope of
the total received acoustic energy.
Face-to-face distance: The distance between the two sensors facing
each other. (Top view of two sensors)
FPM: Feet per minute.
Hysteresis: The lag between making a change, such as increasing power to the
transducers, and the response or effect of that change.
KCFM: Cubic feet per minute X 1000.
M/S: Meters per second.
M**3/S: Cubic meters per second.
Snapping: In operation, the sensor transducers are energized alternately to
transmit an ultrasonic pulse. You can hear a “click” when it does this.
We refer to this as “snapping”
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