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Locating the ISS and Anemometer For the weather station to perform at its best, use these guidelines to select the optimum mounting locations for the ISS and anemometer. Be sure to take into consideration ease of access for maintenance, sensor cable lengths and wireless transmission range when siting the station. Note: When selecting a location for installing your ISS, especially on a rooftop, make sure it is a location far from power lines. Seek professional help if you uncertain about the safety of your installation. Locating the ISS and Anemometer General ISS Siting Guidelines • Place the ISS away from sources of heat such as chimneys, heaters, air conditioners and exhaust vents. • Place the ISS at least 100' (30 m) away from any asphalt or concrete roadway that readily absorbs and radiates heat in the sun. Avoid installations near fences or sides of buildings that receive a lot of sun during the day. • Ideally, place the radiation shield of the ISS 5' (1.5 m) above the ground in the middle of gently sloping or flat, regularly mowed grassy or naturally landscaped area that drains well when it rains. For areas with average maximum yearly snow depths over 3' (0.9 m), mount the ISS 2' (0.6 m) above this depth. • Never install the ISS where it will be directly sprayed by a sprinkler system because it will adversely affect the readings. • Avoid installations near bodies of water such as swimming pools or ponds. • Do not locate the ISS under tree canopies or near the side of buildings that create “rain shadows." For heavily forested areas, site the ISS in a clearing or meadow. • Site the ISS in a location with good sun exposure throughout the day if the ISS is wireless or includes solar radiation or UV radiation sensors. For agricultural applications (important for evapotranspiration (ET) calculations): • Install the ISS and anemometer as a single unit with the radiation shield 5' (1.5 m) above the ground and in the middle of the farm between similar crop types (i.e. two orchards, two vineyards or two row crops), if possible. • Avoid areas exposed to extensive or frequent applications of agricultural chemicals (which can degrade the sensors). • Avoid installation over bare soil. The ET formula works best when the ISS is installed over well-irrigated, regularly mowed grass. • If the last three guidelines cannot be met, install the weather station at the edge of the primary crop of interest. Anemometer Siting Guidelines • For best results, place the anemometer at least 7' (2.1 m) above surrounding obstructions such as trees or buildings that obstruct wind flow. • If mounting on a roof, mount the anemometer at least 7' (2.1 m) above the roof apex (when using a Mounting Tripod, install the anemometer at the very top of the pole). • If mounting the ISS and the anemometer together, such as on a pole or a wooden post, mount the anemometer so it is at least 12'' (0.3 m) above the top of the rain collector cone for best results. • The standard for meteorological and aviation applications is to place the anemometer 33' (10 m) above the ground. Seek professional help for this type of installation. • The standard for agricultural applications is to place the anemometer 6' (2 m) above the ground. This is important for evapotranspiration (ET) calculations. Note: For roof mounting, and ease of installation, we recommend using the optional mounting tripod (#7716). For other installations, use the Mounting Pole Kit (#7717). Note: For more detailed siting suggestions, see Application Note #30: Reporting Quality Observations to NOAA on the Davis Support web site (Locating the ISS and Anemometer Optional: Anemometer Cable Length Considerations • All Vantage Pro2 stations include a 40' (12 m) cable to go between the ISS and the anemometer. This can be extended up to 540' (165 m) using optional extension cables purchased from Davis Instruments. • If most of the anemometer cable length is unused, the coiled cable length can be stowed once the anemometer and ISS have been installed on a site. Attaching the anemometer cable to the mounting pole using the supplied cable tie is the recommended option. Keep the anemometer cable coiled if possible during the ISS and anemometer assembly so that it is easily stowed once installation is complete. Anemometer Cable Cable Tie • The Cabled Vantage Pro2 includes a 100' (30 m) cable to go between the console and the ISS. This can be extended up to 1000' (300 m) using optional cables. Optional: Wireless Transmission Considerations The range of the radio transmission depends on several factors. Try to position the transmitter and the receiver as close as possible for best results. Typical maximum ranges include: • Line of sight: 1000' (300 m). • Under most conditions: 200 - 400' (60 - 120 m). Other range and transmission considerations include: • Range may be reduced by walls, ceilings, trees, foliage, a metal roof or other large metal structures or objects ...

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