AFA4000/1 Airflow Monitor / p.89
7. Calibration
7.1 AFA4000/1 Airflow Monitor
The airflow monitor must be calibrated when it is first installed, or when required during
use.
1. From the Run Screen press and hold the Mute button for 5 seconds until the Main
Menu is displayed.
Note: When you go from the main menu to the run screen, a note briefly appears
saying ‘calibration required’.
2. Use the ↑ / ↓ buttons to select Set Up Monitor, then Calibration.
3. Enter the password (the factory default password is 0-0-0-0) and press Mute to
continue.
4. With the sash open to the normal operating height measure the face velocity using a
calibrated anemometer. Use the ↑ / ↓ buttons to enter the measured face velocity
then press Mute. The monitor samples the airflow for 5 seconds.
5. If the sample is accepted, lower the sash by half and measure the face velocity using a
calibrated instrument. Use the ↑ / ↓ buttons to enter the measured face velocity and
press Mute. The monitor samples the airflow for 5 seconds.
6. If the calibration is successful, the monitor returns to the Main Menu. Select Run to
go to normal operating mode and check the velocity reading is accurate and stable.
7. If the calibration is stable and accurate, press and hold the Mute button for 5 seconds
until the Main Menu is displayed.
8. Select Run to go to normal operating mode.
7.1.1 Possible messages
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