Campbell Scientific CM3 User Manual
INSTRUCTION MANUAL
CM3 Pyranometer
Revision: 10/02
Copyright (c) 1999-2002
Campbell Scientific, Inc.
Warranty and Assistance
The CM3 PYRANOMETER is warranted by CAMPBELL SCIENTIFIC,
INC. to be free from defects in materials and workmanship under normal use
and service for twelve (12) months from date of shipment unless specified
otherwise. Batteries have no warranty. CAMPBELL SCIENTIFIC, INC.'s
obligation under this warranty is limited to repairing or replacing (at
CAMPBELL SCIENTIFIC, INC.'s option) defective products. The customer
shall assume all costs of removing, reinstalling, and shipping defective products
to CAMPBELL SCIENTIFIC, INC. CAMPBELL SCIENTIFIC, INC. will
return such products by surface carrier prepaid. This warranty shall not apply
to any CAMPBELL SCIENTIFIC, INC. products which have been subjected to
modification, misuse, neglect, accidents of nature, or shipping damage. This
warranty is in lieu of all other warranties, expressed or implied, including
warranties of merchantability or fitness for a particular purpose. CAMPBELL
SCIENTIFIC, INC. is not liable for special, indirect, incidental, or
consequential damages.
Products may not be returned without prior authorization. The following
contact information is for US and International customers residing in countries
served by Campbell Scientific, Inc. directly. Affiliate companies handle repairs
for customers wi thin their territories. Please visi t www.campbellsci.com to
determine which Campbell Scientific company serves your country. To obtain
a Returned Materials Authorization (RMA), contact CAMPBELL
SCIENTIFIC, INC., phone (435) 753-2342. After an applications engineer
determines the nature of the problem, an RMA number will be issued. Please
write this number clearly on the outside of the shipping container.
CAMPBELL SCIENTIFIC's shipping address is:
CAMPBELL SCIENTIFIC, INC.
RMA#_____
815 West 1800 North
Logan, Utah 84321-1784
CAMPBELL SCIENTIFIC, INC. does not accept collect calls.
CM3 Pyranometer Table of Contents
PDF viewers note: These page numbers refer to the printed version of this document. Use
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1. General Description ....................................................1
2. Specifications .............................................................1
3. Installation...................................................................2
4. Wiring ..........................................................................4
5. Example Programs .....................................................6
5.1 Average Solar Radiation...........................................................................6
5.2 Total Solar Radiation................................................................................7
5.2.1 Output Format Considerations........................................................8
6. Maintenance................................................................9
7. Calibration...................................................................9
Figures
3-1. CM3 and CM3MT...................................................................................3
3-2. 015 Pyranometer Mounting Arm.............................................................3
3-3. 025 Crossarm Stand and 019ALU Crossarm...........................................4
3-4. UTKZ Leveling Fixture and Crossarm Mount and UT018
Tower Mounting Bracket and Crossarm...........................................4
4-1. CM3 Wiring.............................................................................................5
Tables
5-1. Multipliers Required for Average Flux and Total Flux Density
in SI and English Units..................................................................... 6
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CM3 Pyranometer
1. General Description
This manual provides information for interfacing Kipp & Zonen’s CM3
Pyranometer to a CR10(X), CR510, CR23X, CR7 or 21X datalogger.
The CM3 is shipped with an instruction manual provided by Kipp & Zonen that
contains information concerning the CM3’s construction, spectral sensitivity,
cosine response, and a simple sensor check out procedure. Included with the
sensor and manual is a calibration certificate with the sensor calibration
constant and serial number. Cross check this serial number against the serial
number on your CM3 to ensure that the given ca libration co nstant corresponds
to your sensor.
The CM3 pyranometer is designed for continuous outdoor use. Due to its flat
spectral sensitivity from 300 to 3000 nm, it can be used in natural sunlight,
under plant canopies, in green houses or buildings, and inverted to measure
reflected solar radiation. Two CM3s can be used in combination with an
albedometer fixture (K&Z’s CAF 1) to measure albedos. The CM3 can also be
used to measure most types of artificial light (Xenon lamps, Halogen lamps,
etc.).
The CM3 pyranometer consists of a thermopile sensor, a housing, a dome, and
a cable. The thermopile is coated with a black absorbent coating. The paint
absorbs the radiation and converts it to heat. The resultant temperature
difference is converted to a voltage by the copper-constantin thermopile. The
thermopile is encapsulated in the housing in such a way that it has a field of
view of 180 degrees and the angular characteristics needed to fulfill the cosine
response requirements.
2. Specifications
The CM3 is an ISO Second Class pyranometer. While the worst case accuracy
for daily sums given by Kipp & Zonen is +10%, the typical accuracy is +
Tests at Campbell Scientific on one CM3 indicated an accuracy of +2% when
compared to a recently calibrated Eppley PSP.
ISO SPECIFICATIONS:
Response Time 95%: 18 seconds
2
Zero offset due to 200 W/m
radiation: < 15 Wm
Zero offset due to temperature change
of 5ºK / hr: < +4 Wm
Non stability (% change/year): < + 1%
Non linearity (at 1000 W/m2): < + 2.5%
Directional error (at 1000 W/m2): < + 25 Wm
thermal
-2
-2
-2
5%.
1
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