CMP3-L Pyranometer Revision: 2/09 C o p y r i g h t © 2 0 0 6 - 2 0 0 9 C a m p b e l l S c i e n t i f i c , I n c .
Warranty and Assistance The CMP3-L 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.
CMP3-L Pyranometer 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....................................................................
CMP3-L Pyranometer 1. General Description This manual provides information for interfacing the CMP3-L Pyranometer to various models of Campbell Scientific dataloggers. The CMP3-L is manufactured by Kipp & Zonen and then cabled by Campbell Scientific. Cable length is user specified. The CMP3-L is shipped with an instruction manual provided by Kipp & Zonen that contains information concerning the CMP3-L’s construction, spectral sensitivity, cosine response, and a simple sensor check out procedure.
CMP3-L Pyranometer Temperature Dependence of sensitivity: + 5% (-10º to + 40ºC) Tilt response (+80º) (at 1000 W/m2): < + 2% OTHER SPECIFICATIONS Expected accuracy for daily sums: + 10% Spectral range (50% points, nm): 310 to 2800 nm Sensitivity: 5 to 20 μV W-1 m2 Typical signal output for atmospheric applications: 0 to 15 mV Impedance: 30 to 100 Ω Operating Temperature: -40º to +80ºC Max.
CMP3-L Pyranometer Tools required for installation on a tripod or tower: Small and medium Phillips screwdrivers 5/16”, 1/2” open end wrenches 5/32” Allen wrench Tape measure UV-resistant wire ties Side-cut pliers Compass Step ladder The CM225 Solar Sensor Mounting Stand is used to attach the CMP3-L to a vertical pipe (1.0 – 2.1” OD) as shown in Figure 3-1. The CMP3-L includes a base with two levelling screws, bubble level, and mounting screws. Attach the CMP3-L to the CM225 as follows: 1.
CMP3-L Pyranometer 4. Wiring A schematic diagram of the CMP3-L is shown in Figure 4-1. White Red Blue Black Black Shield FIGURE 4-1. CMP3-L Schematic 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. A differential voltage measurement is recommended because it has better noise rejection than a single-ended measurement.
CMP3-L Pyranometer TABLE 4-2. Single-Ended Connections to Campbell Scientific Dataloggers Color Description CR9000(X) CR5000 CR3000 CR1000 CR800 White Signal (+) Single-Ended Analog Black Signal (-) AG Shield Shield G CR510 CR500 CR10(X) 21X CR7 CR23X Single-Ended Analog Single-Ended Analog 5. Example Programs This section is for users who write their own datalogger programs.
CMP3-L Pyranometer Select the input range as follows: 1. Estimate the maximum expected input voltage by multiplying the maximum expected irradiance (in Wm-2) by the calibration factor (in µV/Wm-2). Divide the answer by 1000 to give the maximum in millivolt units. 2. Select the smallest input range which is greater than the maximum expected input voltage. Normally the 50 mV range for the CR23X, CR5000, CR9000 and CR7, and the 25 mV or 250 mV range for the CR510, CR10X and CR1000 will be suitable.
CMP3-L Pyranometer 5.4 Example Programs The following programs measure the CMP3-L every 10 seconds and convert the mV output to Wm-2 and MJm-2. A sensor calibration of 15.02 µV per Wm2 is used for the example programs. Both programs output an hourly average flux (Wm-2), and a daily total flux density (MJ m-2). Wiring for the examples is given in Table 5-2. TABLE 5-2.
CMP3-L Pyranometer VoltDiff(Solar_Wm2,1,mV25,1,True,0,_60Hz,66.577896,0) ‘use the 50 mV range for the CR3000, CR5000 and CR9000 'Set negative readings to zero: If Solar_Wm2<0 Then Solar_Wm2=0 'Calculate units in MJ, where MJ = m * t * 0.000001. m = Solar_Wm2 from above, and 't = 10 (scan interval) Solar_MJ=Solar_Wm2*0.00001 'Call Data Tables and Store Data CallTable(Table1) CallTable(Table2) NextScan EndProg 5.4.2 CR10X Example Program ;{CR10X} *Table 1 Program 01: 10.
CMP3-L Pyranometer 6: 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) 7: Set Active Storage Area (P80) 1: 1 Final Storage Area 1 2: 101 Array ID 8: Real Time (P77) 1: 1220 Year,Day,Hour/Minute (midnight = 2400) 9: Average (P71) 1: 1 Reps 2: 3 Loc [ Solar_Wm2 ] 10: 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) 11: Set Active Storage Area (P80) 1: 1 Final S
CMP3-L Pyranometer Solution 1 – Change the multiplier in the instruction to (m*0.0001). This will totalize MJ m-2 instead of kJ m-2. Solution 2 – Record the average flux density and later multiply the result by the number of seconds in the output interval to arrive at total flux. Solution 3 – Record the total flux using the high resolution format. The drawback to high resolution is that it requires four bytes of memory per data point, consuming twice as much memory as low resolution.
CMP3-L Pyranometer into the sensor or enclosure connectors. If the resistance is infinite, there is a broken connection (check the wiring). 4. Disconnect the sensor cable and check the voltage output from the sensor. With the sensor located 8” below a 60 W incandescent light bulb the voltage should be approximately 2.5 mV. No voltage indicates a problem with the sensor. Symptom: sensor signal is unrealistically high or low 1.
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