_________________________________________________________________________________
VAISALA _________________________________________________________________________ 5
APPENDIX C
NWS AND WMO CODE TABLES ............................................................. 117
INDEX......................................................................................................... 121
List of Figures
Figure 1
PWD22 Present Weather Detector .......................................... 14
Figure 2
PWD22 Block Diagram ............................................................ 16
Figure 3
PWD22 Optical System ........................................................... 20
Figure 4
RAINCAP
®
Block Diagram ....................................................... 22
Figure 5
PWL111 Block Diagram ........................................................... 24
Figure 6
RAINCAP
®
Surface Signal (Heavy Rain Beginning)................ 25
Figure 7
Principle for Determining Precipitation Type............................ 28
Figure 8
LED Indicators on the PWC22 Board ...................................... 33
Figure 9
Recommended Location of PWD22. Alternative Ways to Mount
the Sensor (A or B). ................................................................. 38
Figure 10
Location of Jumpers and Connectors on the PWC22
Processor/Receiver Board ....................................................... 43
Figure 11
Installing PWD22 to the Support Arm ...................................... 43
Figure 12
Installing the Subassembly to the Mast with the Vaisala Clamp
Assembly.................................................................................. 44
Figure 13
Testing the Connector.............................................................. 44
Figure 14
Cabling Principle ...................................................................... 47
Figure 15
Maintenance Cable .................................................................. 48
Figure 16
Relay Connection: PWD22 Supplies ....................................... 52
Figure 17
Relay Connection: External Relay Supply ............................... 53
Figure 18
Illustration of Contents of Messages 0, 1, and 2...................... 58
Figure 19
Analog Current Output Connection.......................................... 77
Figure 20
Analog Current Output Connection (External Current Source) 78
Figure 21
Assembling the Opaque Glass Plates ..................................... 93
Figure 22
Removing PWT11 .................................................................... 95
Figure 23
Opening Box Screws (1) .......................................................... 96
Figure 24
Removing the PWC22 Board................................................... 97
Figure 25
Removing the Rain Sensor ...................................................... 98
List of Tables
Table 1
Manual Revisions....................................................................... 8
Table 2
Related Manuals ........................................................................ 8
Table 3
Model and Performance Table................................................. 13
Table 4
Vaisala Present Weather Detector PWD22 Nomenclature...... 18
Table 5
Nomenclature for Options of the Vaisala Present Weather
Detector PWD Family............................................................... 18
Table 6
WMO SYNOP Code Limits ...................................................... 30
Table 7
WMO METAR Code Limits ...................................................... 31
Table 8
Default Communication Settings.............................................. 41
Table 9
Commands for Changing Default Settings .............................. 41
Table 10
Commands for Displaying and Changing Parameters............. 42
Table 11
Receptable Connector Default Wiring ..................................... 46
Table 12
PT-100 Sensor Cable Wiring ................................................... 47
Table 13
Control Logic of Relay Controls 1 and 2 .................................. 51
Table 14
Control Logic of Relay Control 1, 2, and 3 ............................... 51
Table 15
Initial Settings and Corresponding Commands ....................... 56