Vaisala WAA151 Installation Manual Page 82

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Installation Manual __________________________________________________________________
80 ___________________________________________________________________ M010114en-B
WT521 including a cross arm for WA-series sensors is mounted to the
top of a standard 60 mm pole mast.
Figure 68 Mounting WT521 to the Top of a Pole Mast
A good shielding is essential for quality data transmission and low
electromagnetic interference. Figure 69 below illustrates how to use
shielded cable with the WT521 transmitter cable glands.
Figure 69 Using Shielded Cable with WT521 Glands
It is recommended to ground a mast equipment with a grounding cable
as short as possible. The quality of this cable is to be checked with a
georesistance meter. The grounding resistance must be less than 10 .
An example of the wiring diagram is shown in Figure 70 on page 81.
It uses RS-232 for communication between the logger and WT521.
For more information on connecting other interfaces or optional
heating for the sensors, refer to WT521 User's Guide.
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