leanpak's patented P-Cone®, available only on Clean-Pak® air handlers, is an effective way to measure airflow.
The mechanical set-up of a P-Cone system is simple. A series of holes is drilled around the fan inlet cone at its narrowest cross section. Another series of holes is drilled at the outer face of the inlet cone. Pressure taps are mounted to each hole. The inner pressure taps and outer pressure taps are connected in a series and each series of pressure taps is connected to either side of a manometer in an array based upon a scientific principal called a Piezometer ring.
When both series of pressure taps are connected to a manometer, pressure differential can be measured. The differential is proportional to the square of the velocity through the cone throat, allowing velocity to be readily determined. If the diameter of the cone throat is known, the differential signal can be converted to CFM. A calibrated manometer provides simple CFM display at the fan. The P-Cone pneumatic signal can easily be interfaced to any building management system.
An optional microprocessor, the Constant Volume Controller or CVC, is specifically designed to provide digital readout and control of airflow through fans equipped with P-Cone airflow stations. The control panel maintains a CFM set point using a PID control loop that controls either an adjustable frequency drive (AFD) or CLEANPAKs Econo-Disk®. The CVC easily interfaces to any building management system.
|Products may be protected by one or more of the following US patents: 5,613,759; 5,794,397; 5,014,608; 6,209,275; 6,351,920; 5,161,941; 5,088,886; 5,192,348; 5,207,614; 5,454,756; 5,586,861; 5,628,581; 5,681,143 and foreign patents.|
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