User's Guide ______________________________________________________________________
102 _________________________________________________________________ M210455EN-B
Ultrasonic Wind Sensor WS425
Ultrasonic Wind Sensor requires a minimum amount of maintenance.
If the sensor fails, replace it with a known good unit.
Present Weather Detector PWD11A
PWD11A is designed to operate continuously for several years
without maintenance other than cleaning of the lenses and the DRD
sensing surface (see Figure 53 below). No initial calibration of
PWD11A is needed, because the sensor has been calibrated at the
factory. Periodic maintenance of the PWD11A Present Weather
Detector includes:
- Cleaning of the transmitter and receiver lenses and hoods
- Cleaning of the DRD Rain Detector.
0105-054
Figure 53
Present Weather Detector (Arrow Pointing to DRD)
NOTE
Some erroneous data may be generated due to cleaning the sensor.
Cleaning Transmitter and Receiver
Lenses and Hoods
The lenses of the PWD11A transmitter and receiver units should be
relatively clean to get reliable results. With dirty lenses, the shown
visibility values are not reliable. Cleaning should be done every six
months or more often depending on the conditions (for example, if
there are roads nearby, more cleaning will be necessary).
