Measuring air velocity in ducts, the sensor PFLV12

The sensors are designed to measure air velocity in non-aggressive environment in air conditioning ducts (PFLV12) or on the facade of the windward side of the house (PFLV111). The PFLV111 type can be used e.g. for automatic closing of the shutters or retracting the awnings.

The velocity sensor itself is located at the end of the plastic ABS stem. For accurate measurement the sensor must be positioned parallel to the flowing air, as shown on the cap of the device. As the sensor is open, contact with heavier particles must be avoided to prevent damage.

The housing is manufactured from grey polycarbonate. The PFLV12 sensor includes a plastic central holder used for mounting the sensor to the wall of the air duct. The PFLV111 sensors are mounted directly on the wall of the house (protected from rain), and wind is detected by using the airflow along the wall.

Operating conditions require common chemically non-aggressive environment where sensors do not need servicing; however, it is advisable to regularly clean the sensor from dirt (dust, cobwebs etc.).

Fig. 1. An example of wiring the PFLV12 sensor with current output to the CP-1006 module