Removing And Replacing; Removing And Replacing The Optical Units - Vaisala PWD22/52 User Manual

USER'S GUIDE____________________________________________________________________

Removing and Replacing

CAUTION
NOTE
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If the optical units PWC22/52 or PWT11 have been replaced, the
new scaling factor might change more than 20 % from the original
scaling factor, value and the CAL command is ignored. In this case
use the FCAL command (factory calibration) instead of CAL
during the calibration procedure.
This section describes in detail how to remove and replace the optical
units PWT11 Transmitter and PWC22/52 Controller/Receiver. Removing
the units comes into question, when there is reason to suspect that
malfunction of PWD22/52 is caused by faults in the optical units or the
rain detector.
Removing and Replacing the Optical
Units
Servicing the equipment must be performed by qualified personnel.
After replacing the optical units you need factory calibration. (See
section Calibration Procedure on page 85).