Campbell NR01, Инструкция по эксплуатации

Страница: 16 / 42

NR01 Four-Component Net Radiation Sensor
8
TABLE 6-1. Recommendations for Installation of the NR01
Location Location of measurement should be representative of the
total surrounding area, in particular in case the NR01 is used
for environmental net radiation measurements. If possible,
mount the sensor on a separate pole at least 25 ft away from
main logger tower or tripod.
Mechanical
mounting
A 2-axis leveling assembly is included as part of the sensor
mount which is suitable for a range of pipe diameters, max
1-inch IPS pipe (33 mm diameter).
Radiation
detection
Avoid objects that cast shadows or reflections on the
instrument. This includes both incoming and outgoing
radiation.
Leveling Use the bubble-level to see if the instrument is mounted
horizontally. For viewing the level, the radiation screens
must be removed. Alternatively a spirit level can carefully
be put on the pyrgeometer window.
Orientation By convention, with the wiring to the nearest pole (north in
the northern hemisphere, south in the southern hemisphere).
Height of
installation
In case of inverted installation, a height of approximately 4
ft (1.5 m) above ground is recommended by the WMO (to
get good spatial averaging).
Tilt The NR01 should typically be installed horizontally, but for
some applications, may be installed in a tilted position. In
all cases, it will measure the fluxes that are incident on the
surface that is parallel to the sensor surface.
6.3 Datalogger Wiring
The four radiation outputs can be measured using differential or single-ended
inputs on the datalogger. A differential voltage measurement is recommended
because it has better noise rejection than a single-ended measurement. When
differential inputs are used, jumper the low side of the input to
⏚
to keep the
signal within the common mode range.
Cables generally act as a source of signal distortion by picking up capacitively
coupled noise. Therefore, Campbell Scientific recommends keeping the
distance between the datalogger and sensor as short as possible.
The sensor has two cables with similar color schemes.
It is important to make sure you identify cable 1 and
cable 2 correctly, especially before connecting any
source of power such as to the heater. Failure to do so
may damage the sensor.
WARNING