Campbell CS300 User manual

CS300 Pyranometer
Revision: 1/11
Copyright © 1994-2011
Campbell Scientific, Inc.

WARRANTY AND ASSISTANCE
This equipment is warranted by CAMPBELL SCIENTIFIC (CANADA) CORP. (“CSC”) to
be free from defects in materials and workmanship under normal use and service for
six (6) months from date of shipment unless specified otherwise. ***** Batteries
are not warranted. ***** CSC's obligation under this warranty is limited to repairing or
replacing (at CSC's option) defective products. The customer shall assume all costs of
removing, reinstalling, and shipping defective products to CSC. CSC will return such
products by surface carrier prepaid. This warranty shall not apply to any CSC 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. CSC is not
liable for special, indirect, incidental, or consequential damages.
Products may not be returned without prior authorization. To obtain a Return
Merchandise Authorization (RMA), contact CAMPBELL SCIENTIFIC (CANADA) CORP.,
at [phone]. An RMA number will be issued in order to facilitate Repair Personnel
in identifying an instrument upon arrival. Please write this number clearly on the outside
of the shipping container. Include description of symptoms and all pertinent details.
CAMPBELL SCIENTIFIC (CANADA) CORP. does not accept collect calls.
Non-warranty products returned for repair should be accompanied by a purchase order to
cover repair costs.
11564 149 Street | Edmonton AB T5M 1W7
780.454.2505 | fax [phone] | campbellsci.ca

PLEASE READ FIRST
About this manual
Please note that this manual was originally produced by Campbell Scientific Inc. (CSI) primarily
for the US market. Some spellings, weights and measures may reflect this origin.
Some useful conversion factors:
Area: 1 in2(square inch) = 645 mm2
Length: 1 in. (inch) = 25.4 mm
1 ft (foot) = 304.8 mm
1 yard = 0.914 m
1 mile = 1.609 km
Mass: 1 oz. (ounce) = 28.35 g
1 lb (pound weight) = 0.454 kg
Pressure: 1 psi (lb/in2) = 68.95 mb
Volume: 1 US gallon = 3.785 litres
In addition, part ordering numbers may vary. For example, the CABLE5CBL is a CSI part
number and known as a FIN5COND at Campbell Scientific Canada (CSC). CSC Technical
Support will be pleased to assist with any questions.

CS300 Table of Contents
PDF viewers note: These page numbers refer to the printed version of this document. Use
the Adobe Acrobat® bookmarks tab for links to specific sections.
1. General Description.....................................................1
2. Specifications ..............................................................1
3. Installation....................................................................2
4. Wiring............................................................................4
5. Programming ...............................................................4
5.1 Example Programs....................................................................................5
5.1.1 CR1000 Example Program .............................................................5
5.1.2 CR10X Example Program ..............................................................6
5.2 Total Solar Radiation................................................................................8
6. Maintenance and Calibration......................................8
7. Troubleshooting ..........................................................9
Figures
3-1. CM225 Pyranometer Mounting Stand and CM202 Crossarm ................3
3-2. 015ARM Pyranometer Mounting Arm ...................................................3
4-1. CS300 Schematic ....................................................................................4
Tables
4-1. Connections to Campbell Scientific Dataloggers....................................4
5-1. Multipliers Required for Average Flux and Total Flux Density in SI
and English Units.................................................................................5
5-2. Wiring for Example Programs ................................................................5
i

CS300 Pyranometer
1. General Description
The CS300 measures incoming solar radiation with a silicon photovoltaic
detector mounted in a cosine-corrected head. Output from the detector is a
current, which is converted to voltage by a potentiometer potted in the sensor
head. The resistance of the potentiometer is adjusted when the sensor is
calibrated so that all sensors have the same output sensitivity.
The CS300 is calibrated against a Kipp and Zonen CM21 under natural
sunlight to accurately measure sun plus sky radiation (300 to 1100 nm). The
CS300 should not be used under vegetation or artificial lights.
During the night the CS300 may read slightly negative incoming solar
radiation. This negative signal is caused by RF noise passing through the
photo-diode. Negative values may be set to zero in the datalogger program.
For more theoretical information on the silicon photovoltaic detector see Kerr,
J. P., G. W. Thurtell, and C. B. Tanner: An integrating pyranometer for
climatological observer stations and mesoscale networks. J. Appl. Meteor., 6,
688-694.
2. Specifications
Power requirements: none, self-powered
Absolute accuracy: ±5% for daily total radiation
Cosine response: ±4% at 75° zenith angle
±1% at 45° zenith angle
Temperature response: <1% at 5° to 40°C
Long-term stability: <2% per year
Operating temperature: -40° to +55°C
Relative humidity: 0 to 100%
Output: 0.2 mV per W m-2
Dimensions: 0.9" (2.4 cm) diameter, 1.0" (2.5 cm) height
Weight: 2.3 oz (65 g) with 2 m lead wire
Measurement range: 0 to 2000 W m-2 (full sunlight |1000 W m-2)
Light spectrum waveband: 300 to 1100 nm
The black outer jacket of the cable is Santoprene® rubber. This
compound was chosen for its resistance to temperature extremes,
moisture, and UV degradation. However, this jacket will
support combustion in air. It is rated as slow burning when
tested according to U.L. 94 H.B. and will pass FMVSS302.
Local fire codes may preclude its use inside buildings.
NOTE
1

CS300 Pyranometer
3. Installation
The CS300 should be mounted such that it is never shaded by the tripod/tower
or other sensors. The sensor should be mounted with the cable pointing
towards the nearest magnetic pole, e.g., in the Northern Hemisphere point the
cable toward the North Pole.
Mounting height is not critical for the accuracy of the measurement. However,
pyranometers mounted at heights of 3 m or less are easier to level and clean.
To ensure accurate measurements, the CS300 should be mounted using
PN 18356 base/leveling fixture, which incorporates a bubble level and three
adjustment screws. The CS300 and base/leveling fixture are attached to a
tripod or tower using one of three mounting configurations (see Figures 3-1
and 3-2).
Newer CS300 pyranometers have a bulge in their cable
that contains a circuit board (located 18” from the sensor
head). The bulge should be mounted on the underside of
the mounting arm to give some protection from direct
sunlight. To prevent the circuit board from being moved or
stressed, cable tie each side of the bulge to the mounting
arm.
CAUTION
Tools required for installation on a tripod or tower:
Small and medium Phillips screwdrivers
1/2” open end wrench for CM225 or 015ARM (Figures 3-1, 3-2)
Tape measure
UV-resistant cable ties
Side-cut pliers
Compass
Step ladder
Remove the red cap after installing the sensor. Save this cap for
shipping or storing the sensor.
NOTE
2

CS300 Pyranometer
CS300 Pyranometer
PN 18356 Base
ossarm
CM225 Stand
CM200 Series Cr
FIGURE 3-1. CM225 Pyranometer Mounting Stand
and CM202 Crossarm
CS300 Pyranometer
PN 18356 Base
015ARM
FIGURE 3-2. 015ARM Pyranometer Mounting Arm
3

CS300 Pyranometer
4. Wiring
A schematic diagram of the CS300 is shown in Figure 4-1.
RED
BLACK
CLEAR
500 to 600 :
typical
Single-Ended
Analog Input
Ground/AG
Ground/G
FIGURE 4-1. CS300 Schematic
Connections to Campbell Scientific dataloggers are given in Table 4-1. When
Short Cut for Windows software is used to create the datalogger program, the
sensor should be wired to the channels shown in the wiring diagram created by
Short Cut.
TABLE 4-1. Connections to Campbell Scientific Dataloggers
Color
Wire Label
CR9000(X)
CR5000
CR3000
CR1000
CR800
CR850
CR510
CR500
CR10(X)
21X
CR7
CR23X
CR200(X)
Red Signal SE Analog SE Analog SE Analog SE Analog
Black Signal
Reference
AG
Clear Shield
G
5. Programming
This section is for users who write their own datalogger programs. A
datalogger program to measure this sensor can be created using Campbell
Scientific’s Short Cut Program Builder software. You do not need to read this
section to use Short Cut.
The output from the CS300 is 0.2 mV per Wm-2. The voltage signal from the
CS300 is measured using the single-ended voltage instruction (VoltSE in
CRBasic or Instruction 1 in Edlog). Dataloggers that use CRBasic include the
CR200(X), CR800, CR850, CR1000, CR3000, CR5000, and CR9000(X).
Dataloggers that use Edlog include CR7, CR10(X), CR510, and CR23X. Both
CRBasic and Edlog are included in PC400 and LoggerNet datalogger support
software.
4

CS300 Pyranometer
Solar radiation can be recorded as an average flux density (W m-2) or daily
total flux density (MJ m-2). The appropriate multipliers are listed in Table 5-1.
Negative values should be set to zero before being processed.
TABLE 5-1. Multipliers Required for Average Flux
and Total Flux Density in SI and English Units
UNITS MULTIPLIER PROCESS
W m-2 5.0 Average
MJ m-2 t * 0.000005 Total
kJ m-2 t * 0.005 Total
cal cm-2 min-1 0.005 * (1.434) Average
cal cm-2 t * 0.005 * (0.0239) Total
t = datalogger execution interval in seconds
Nearby AC power lines, electric pumps, or motors can be a source of electrical
noise. If the sensor or datalogger is located in an electrically noisy
environment, the measurement should be made with the 60 or 50 Hz rejection
integration option as shown in the example programs.
5.1 Example Programs
The following programs measure the CS300 every 10 seconds and convert the
mV output to Wm-2 and MJm-2. Both programs output an hourly average flux
(Wm-2), and a daily total flux density (MJm-2). Negative values are set to zero
before being processed. Wiring for the examples is given in Table 5-2.
TABLE 5-2. Wiring for Example Programs
Color Description CR1000 CR10X
Red Signal SE 1 SE 1
Black Signal Ground
AG
Clear Shield
G
5.1.1 CR1000 Example Program
'CR1000
'Declare Variables and Units
Public SlrW
Public SlrMJ
Units SlrW=W/m²
Units SlrMJ=MJ/m²
5

CS300 Pyranometer
'Define Data Tables
DataTable(Table1,True,-1)
DataInterval(0,60,Min,10)
Average(1,SlrW,FP2,False)
EndTable
DataTable(Table2,True,-1)
DataInterval(0,1440,Min,10)
Totalize(1,SlrMJ,IEEE4,False)
EndTable
'Main Program
BeginProg
Scan(10,Sec,1,0)
'Measure CS300 Pyranometer
VoltSe (SlrW,1,mV250,1,1,0,_60Hz,1.0,0) use 1000 mV range for the CR5000, CR9000
For the CR1000, use the Auto Range or
'Set negative values to zero mV 2500 range for > 1200 w/m2intensities.
If SlrW<0 Then SlrW=0
'Convert mV to MJ/m² for a 10 second scan rate
SlrMJ=SlrW*0.00005
'Convert mV to W/m²
SlrW=SlrW*5.0
'Call Data Tables and Store Data
CallTable(Table1)
CallTable(Table2)
NextScan
EndProg
5.1.2 CR10X Example Program
;{CR10X}
*Table 1 Program
01: 10.0000 Execution Interval (seconds)
; Measure CS300 pyranometer
1: Volt (SE) (P1)
1: 1 Reps
2: 24 250 mV 60 Hz Rejection Range ; use 500 mV range for the CR7 and 21X,
1000 mV range for the CR23X. For the
3: 1 SE Channel CR10X, use range code 0 or 25 for
4: 1 Loc [ SlrW ] > 1200 w/m2intensities.
5: 1.0 Multiplier
6: 0.0 Offset
6

CS300 Pyranometer
; Set negative values to zero
2: If (X<=>F) (P89)
1: 1 X Loc [ SlrW ]
2: 4 <
3: 0 F
4: 30 Then Do
3: Z=F x 10^n (P30)
1: 0 F
2: 0 n, Exponent of 10
3: 1 Z Loc [ SlrW ]
4: End (P95)
; Convert mV to MJ/m2 for 10 second execution interval
5: Z=X*F (P37)
1: 1 X Loc [ SlrW ]
2: .00005 F
3: 2 Z Loc [ SlrMJ ]
; Convert mV to W/m2
6: Z=X*F (P37)
1: 1 X Loc [ SlrW ]
2: 5 F
3: 1 Z Loc [ SlrW ]
7: If time is (P92)
1: 0 Minutes (Seconds --) into a
2: 60 Interval (same units as above)
3: 10 Set Output Flag High (Flag 0)
8: Set Active Storage Area (P80)
1: 1 Final Storage Area 1
2: 101 Array ID
9: Real Time (P77)
1: 1220 Year,Day,Hour/Minute (midnight = 2400)
10: Average (P71)
1: 1 Reps
2: 1 Loc [ SlrW ]
11: If time is (P92)
1: 0 Minutes (Seconds --) into a
2: 1440 Interval (same units as above)
3: 10 Set Output Flag High (Flag 0)
12: Set Active Storage Area (P80)
1: 1 Final Storage Area 1
2: 102 Array ID
7

CS300 Pyranometer
13: Real Time (P77)
1: 1220 Year,Day,Hour/Minute (midnight = 2400)
14: Resolution (P78)
1: 1 High Resolution
15: Totalize (P72)
1: 1 Reps
2: 2 Loc [ SlrMJ ]
16: Resolution (P78)
1: 0 Low Resolution
5.2 Total Solar Radiation
If solar radiation is totalized in units of kJ m-2, there is a possibility of
overranging the output limits. For CRBasic dataloggers, you can avoid this by
using the IEEE4 or long data format. With the Edlog dataloggers the largest
number that the datalogger can output to final storage is 6999 in low resolution
(default), and 99999 in high resolution.
For Edlog dataloggers, if you assume that the daily total flux density is desired
in kJ m-2 and assume an irradiance of 0.5 kW m-2, the maximum low resolution
output limit will be exceeded in just under four hours. This value was found
by taking the maximum flux density the datalogger can record in low
resolution and dividing by the total hourly flux density.

39 6999
0 5 3600
2
21 1
.
.
hr kJ m
kJ m s s hr

  (1)
To circumvent this limitation for Edlog dataloggers, record an average flux.
Then, during post processing, multiply the average flux by the number of
seconds in the output interval to arrive at a output interval flux density. Sum
the output interval totals over a day to find a daily total flux density.
Another alternative for Edlog dataloggers is to record total flux using the high
resolution format. Instruction 78 is used to switch to the high resolution. The
disadvantage of the high resolution format is that it takes more memory per
data point.
6. Maintenance and Calibration
On a monthly basis the level of the pyranometer should be checked. Any dust
or debris on the sensor head should be removed. The debris can be removed
with a blast of compressed air or with a soft bristle, camel hair brush.
Handle the sensor carefully when cleaning. Be careful not
to scratch the surface of the sensor.
CAUTION
8

CS300 Pyranometer
Recalibrate the CS300 every three years. Obtain an RMA number before
returning the CS300 to Campbell Scientific, Inc. for recalibration.
7. Troubleshooting
Symptom: -9999 or radiation values around 0
1. Check that the sensor is wired to the Single-Ended channel specified by
the measurement instruction.
2. Verify that the Range code is correct for the datalogger type.
3. Disconnect the sensor leads from the datalogger and use a DVM to check
the voltage between the red (+) and the black (-) wires. The voltage
should be 0 – 200 mV for 0 to 1000 Wm-2 radiation. No voltage indicates
a problem with either the photodiode or the shunt resistor, both of which
are potted in the sensor head and can not be serviced.
Symptom: Incorrect solar radiation
1. Make sure the top surface of the sensor head is clean, and that the sensor
is properly leveled.
2. Verify that the Range code, multiplier and offset parameters are correct
for the desired engineering units and datalogger type.
Jumps of 3 to 6 Wm-2 are typical of CR200(X) measurements,
due to the 0.6 mV CR200(X) resolution and the 0.2 mV/Wm-2
CS300 sensitivity.
NOTE
9

CS300 Pyranometer
10

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