51
(4)
Only use this if you improperly installed the weather station sensor array, and did not point
the
direction
reference
to
true
north.
(5)
The default conversion factor based on the wavelength for bright sunlight is 126.7 lux / w/m
2
. This variable can be adjusted by photovoltaic experts based on the light wavelength of
interest, but for most weather station owners, is accurate for typical applications, such as
calculating
evapotransporation
and
solar
panel
efficiency.
(6)
Wind speed is the most sensitive to installation constraints. The rule of thumb for properly
installing a wind speed sensor is 4 x the distance of the tallest obstruction. For example, if
your house is 6m tall and you mount the sensor on a 1.5m pole:
Distance = 4 x (6
–
1.5)m = 18m.
Many installations are not perfect and installing the weather station on a roof can be
difficult. Thus, you can calibrate for this error with a wind speed multiplier.
In addition to the installation challenges, wind cup bearings (moving parts) wear over time.
Without a calibrated source, wind speed can be difficult to measure. We recommend using a
calibrated wind meter (available from Ambient Weather) and a constant speed, high speed
fan.
(7)
The rain collector is calibrated at the factory based on the funnel diameter. The bucket tips
every 0.03 of rain (referred to as resolution). The accumulated rainfall can be compared to a
sight
glass
rain
gauge
with
an
aperture
of
at
least
10mm..
Make sure you periodically clean the rain gauge funnel.
Note:
The purpose of calibration is to fine tune or correct for any sensor error associated with
the devices margin of error. Errors can occur due to electronic variation (example, the temperature
sensor is a resistive thermal device or RTD, the humidity sensor is a capacitance device), mechanical
variation, or degradation (wearing of moving parts, contamination of sensors).
Calibration is only useful if you have a known calibrated source you can compare it against, and is
optional. This section discusses practices, procedures and sources for sensor calibration to reduce
manufacturing and degradation errors. Do not compare your readings obtained from sources such as
the internet, radio, television or newspapers. The purpose of your weather station is to measure
conditions of your surroundings, which vary significantly from location to location.
Содержание IP Observer WH2600 SE
Страница 1: ...1 WH2600 SE WH2601 SE Benutzerhandbuch Internet Wetterstation ...
Страница 26: ...26 Reference Figure 4 Locate and align the groove on the sensor array and mounting pole Figure 4 ...
Страница 28: ...28 Figure 6 ...
Страница 48: ...48 Figure 22 Figure 30 ...
Страница 56: ...56 Figure 25 ...
