Vaisala WAC155, User Manual

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3.8 Mounting WAC155 on Top of Pole Mast
A long cable between different units (sensors, transmitters,
power supplies, and displays) can cause a lethal surge voltage if a lightning
strikes in the vicinity. Always ground the mast equipment case close to the
mast with a short low-resistance cable.
WARNING!
The following figure shows how to mount the WAC155 transmitter on top of a Ø 60 mm pole
mast using the standard mounting clamp. The arrow on the cover of the junction box must
point to the North.
Figure 17 Mounting WAC155 on Top of Pole Mast
3.8.1 Alignment
After mounting the WAC155 transmitter to the mast, make sure that the WAV151
end of the cross arm is pointing to the North.
If you cannot align the cross arm wind vane end directly to the North, you can measure the
deviation angle and set the value of wind direction angle offset with the SETDIR command.
See SETDIR (page 36) .
When the cross arm deviates from the North in the clockwise direction, use the plus sign (+) in
the offset parameter. For counterclockwise deviation, use the minus sign (-).
Chapter 3 – Installation
27