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Campbell Scientific Companies

Campbell Scientific, Inc. (CSI)

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Please visit www.campbellsci.com to obtain contact information for your local US or International representative.

Содержание CMP3-L

Страница 1: ...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 ...

Страница 2: ...r 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 A...

Страница 3: ...5 3 Offset 6 5 4 Example Programs 7 5 4 1 CR1000 Example Program 7 5 4 2 CR10X Example Program 8 5 5 Output Format Considerations 9 6 Maintenance 10 7 Troubleshooting 10 Figures 3 1 CMP3 L Pyranometer Attached to CM225 Solar Sensor Mounting Stand3 4 1 CMP3 L Schematic 4 Tables 4 1 Differential Connections to Campbell Scientific Dataloggers 4 4 2 Single Ended Connections to Campbell Scientific Data...

Страница 4: ......

Страница 5: ...n houses or buildings and inverted to measure reflected solar radiation Two CMP3 Ls can be used in combination to measure albedo The CMP3 L can also be used to measure most types of artificial light Xenon lamps Halogen lamps etc The CMP3 L pyranometer consists of a thermopile sensor housing dome and cable The thermopile is coated with a black absorbent coating The paint absorbs the radiation and c...

Страница 6: ... position In all cases it will measure the flux that is incident on the surface that is parallel to the sensor surface Site the CMP3 L to allow easy access for maintenance while ideally avoiding any obstructions above the plane of the sensing element It is important to mount the CMP3 L such that a shadow will not be cast on it at any time If this is not possible try to choose a site where any obst...

Страница 7: ...h the CMP3 L to the CM225 as follows 1 Loosely mount the pyranometer on the mounting arm Do not fully tighten the two mounting screws 2 Turn the levelling screws as required to bring the bubble of the spirit level within the ring 3 Tighten the mounting screws to secure the assembly in its final position Check that the pyranometer is still correctly levelled and adjust as necessary 4 Attach the whi...

Страница 8: ...s for a Differential measurement are given in Table 4 1 A user supplied jumper wire should be connected between the low side of the differential input and ground AG or to keep the signal in common mode range Connections to Campbell Scientific dataloggers for a Single Ended measurement are given in Table 4 2 TABLE 4 1 Differential Connections to Campbell Scientific Dataloggers Color Description CR9...

Страница 9: ...g from 0 to a maximum of up to 20 mV in natural light depending on the calibration factor and radiation level A differential voltage measurement is recommended because it has better noise rejection than a single ended measurement If a differential channel is not available a single ended measurement can be used The acceptability of a single ended measurement can be determined by simply comparing th...

Страница 10: ...by the manufacturer gives the output of the sensor c as microvolts V x 10 6 per Wm 2 As the datalogger voltage measurement instructions give a default output in mV the following equation should be used to calculate the multiplier m to give the readings in Wm 2 m 1000 c Other units can be used by adjusting the multiplier as shown in Table 5 1 TABLE 5 1 Multipliers Required for Flux Density and Tota...

Страница 11: ...al DIFF Analog Low DIFF Analog Low Shield Shield G Jumper to AG or with user supplied wire 5 4 1 CR1000 Example Program CR1000 Declare Variables and Units Public Solar_Wm2 Public Solar_MJ Units Solar_Wm2 W m Units Solar_MJ MJ m Hourly Data Table DataTable Table1 True 1 DataInterval 0 60 Min 10 Average 1 Solar_Wm2 FP2 False EndTable Daily Data Table DataTable Table2 True 1 DataInterval 0 1440 Min 1...

Страница 12: ... 1 Program 01 10 0000 Execution Interval seconds CMP3 L measurement in Wm 2 1 Volt Diff P2 1 1 Reps 2 23 25 mV 60 Hz Rejection Range use the 50 mV range for the CR7 21X and CR23X 3 1 DIFF Channel use the 250 mV range for the CR10X if 4 3 Loc Solar_Wm2 calibration factor is 25 µV Wm 2 5 66 5778 Multiplier 6 0 Offset Set negative values to zero 2 If X F P89 1 3 X Loc Solar_Wm2 2 4 3 0 F 4 30 Then Do...

Страница 13: ...78 1 1 High Resolution 14 Totalize P72 1 1 Reps 2 4 Loc Solar_MJ 15 Resolution P78 1 0 Low Resolution 5 5 Output Format Considerations When using the Campbell Scientific floating point data format to store data the largest number the datalogger can store in Final Storage is 6999 in low resolution mode FP2 and 99999 in high resolution mode if available If the measurement value is totalized there is...

Страница 14: ...ments In particular on clear windless nights the outer dome temperature of horizontally placed pyranometers can fall as low as the dew point temperature of the air due to infra red radiation exchange with the cold sky The effective sky temperature can be 30 C lower than the ground temperature which results in an infra red emission of 150 Wm 2 If this happens dew glazed frost or hoar frost can be p...

Страница 15: ... a problem with the sensor Symptom sensor signal is unrealistically high or low 1 Check that the right calibration factor has been properly entered into the datalogger program Please note that each sensor has its own individual calibration factor 2 Check the condition of the sensor cable Symptom sensor signal shows unexpected variations 1 Check for the presence of strong sources of electromagnetic...

Страница 16: ...CMP3 L Pyranometer 12 ...

Страница 17: ...This is a blank page ...

Страница 18: ...ZIL www campbellsci com br suporte campbellsci com br Campbell Scientific Canada Corp CSC 11564 149th Street NW Edmonton Alberta T5M 1W7 CANADA www campbellsci ca dataloggers campbellsci ca Campbell Scientific Ltd CSL Campbell Park 80 Hathern Road Shepshed Loughborough LE12 9GX UNITED KINGDOM www campbellsci co uk sales campbellsci co uk Campbell Scientific Ltd France Miniparc du Verger Bat H 1 ru...

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