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3. Site selection and mounting
3.1 Weather station location
The ideal site is level and well away from obstructions such as buildings, tress, and steep slopes. The weather station is typically pole or
tripod mounted.
Take into account the needs for all attached sensors to determine the optimal mounting location. Ambient air temperature and irradiance
measurements can be affected by obstructions, local topography, and surface type. Each site is different and presents unique challenges.
By far the most important consideration is obstruction.
• Objects that are 10 degrees or more above the horizontal plane must not block irradiance
• Ambient air temperature measurement should be placed away from any dark, heat-absorbing surface (asphalt, dark-colored surfaces)
and should be no closer than 4 times the obstruction's height.
ATTENTION –
A simple way to think of obstruction is the rule of 10. If the obstruction is at a distance of at least 10 times its height
A
above the weather station, you're good.
Towers can be used to raise the weather station above low-lying obstructions.
3.2 Weather station mounting requirements
Mount the support mast securely to a support structure. Mounting equipment is sold as an accessory. The mast may also be attached to
a support structure using U-Bolts. Do not tighten the support structure to the unit, as directional orientation will be required. Rotate the
assembled unit until the electronics enclosure faces TRUE SOUTH or TRUE NORTH if you are in the northern or southern hemisphere,
respectively. Secure the support mast to the assembly. Lining up the two holes in each mast prevents rotation. At this point the entire unit
should be secured to the support structure. It is crucial that the device be oriented as precisely as possible. For the VSN800-14 version,
the wind direction measurement is directly related to this positioning. Regardless of how you mount the system, the bottom of the electronic
enclosure should not extend more than 12" or less than 7" above the support of the mounting tube.
3.2.1 Other Mounting Considerations
The exact method of mounting the weather station is left to the installer. However, there are some guidelines and recommendations to
consider
• The environmental unit is designed to withstand very harsh weather conditions. Refer to the data for individual sensors for the ranges at
which measurements remain accurate.
• The environmental unit weighs approximately 7 lbs. Pole mounts in the ground or attached to structures that support up to 50 lbs. are
recommended. VSN800 Weather Station Product Manual - 5 -
• For ground tripod mounts, the ground should be as level as possible.
• For roof mounts, avoid locating the station near any heat sources such as chimneys or vents. Do not install on an existing mast unless
you know the mast can take the additional weight of the weather station. When roof-mounting the sensor assembly, the unit should be
mounted toward an edge of the roof preferably on the prevailing wind side of the building and should be at least 2-1/2 feet above the
roofline.
• The weather station unit should be mounted at least 5 feet off the ground. Surrounding terrain and structures may dictate a much higher
mount.
• If the weather station is mounted more than 10 feet off the ground, guy wires should be used to secure the mount. Guy wire attachments
must not interfere with instruments.
• Wall-mounting, pole-mounting, or tripod kits are available. Contact your FIMER distributor.
• Test the system at ground level and make sure it operates properly prior to final mounting.
EN
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