Campbell CM10K Specifikace stáhnout pdf (Strana 33)

3.16 Licor LI200X-L Solar Radiation sensor

Equipment/supplies needed:

• Electrical tape

• Permanent marker

• Plastic cable ties

• Wire cutter/stripper

• Allen wrench

• Solar Radiation sensors (LI200X-L)

It is recommended to install two pyranometers (solar radiation sensors) for redundancy and to

account for seasonal changes in solar path. If the pyranometer is not at the very top of the base

tower, the base tower could shade it during some periods of the year depending on the

geographical location of the field station. For example, in stations located north of the equator

the sun path moves southwards between the summer solstice (June 21) and the winter solstice

(December 21) and then back northwards until the next summer solstice (June 21). If the

pyranometer is facing south then the tower may cast a shade on it between the summer solstice

and the fall equinox (September 23) and then again between the spring equinox (March 21) and

the summer solstice (see http://astro.unl.edu/naap/motion3/animations/sunmotions.swf for a nice

simulation of this). A similar situation can arise for tropical locations south of the equator. To

avoid this problem it is better to have two pyranometers, one facing north and one facing south

and then the appropriate reading can be post-processed depending on the time of the year (not in

the original data!). Even if the pyranometer is not shaded (e.g. at the top of a structure), it is

always better to have two in case one gets dirty, or malfunctions.

1. Mounting the sensor. Attach a CM225 stand to the end of the cross arm (CM200 Series)

using the U-bolts provided so there is a leveled surface for the sensor (Figure 16:). The

height of the sensor is not as critical as the orientation (either facing north or south), but

should be mounted near the top of the tower where it has the best access to incoming

light. Attach the leveling base (LI2003S) to the CM225 stand and mount the sensor on it

by tightening the small screw on the side with the included Allen wrench.

2. Level the sensor. Use the bubble level and adjustment screws on the base to level the

sensor accurately.

3. Mark the sensors. Using two pieces of tape, mark the north-facing sensor stand with a

“1” and the south-facing sensor stand with a “2” using a permanent marker so it is easy to

identify the sensor number on the Climate Maintenance Log form (Appendix A.3).

Note: See the video titled “Installing the solar radiation sensors” on the TEAM portal in

the Climate Protocol section for more information

(http://www.teamnetwork.org/en/protocols/threat/climate).

4. Secure the cables. Once the sensors are mounted and leveled, route and secure the cables

along the cross arm and then along the tower using plastic cable ties. Lead the cables into

the enclosure.

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Campbell CM10K Specifikace Strana 33