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INSTRUCTION MANUAL

Q-7.1 Net Radiometer

Revision: 5/96

C o p y r i g h t ( c ) 1 9 9 1 - 1 9 9 6

C a m p b e l l S c i e n t i f i c , I n c .

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Summary of Contents for Q-7.1

Page 1: ...INSTRUCTION MANUAL Q 7 1 Net Radiometer Revision 5 96 C o p y r i g h t c 1 9 9 1 1 9 9 6 C a m p b e l l S c i e n t i f i c I n c ...

Page 2: ...er 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 ...

Page 3: ...te to a vertical or horizontal pipe or rod that is less than 38 mm 1 5 inches in diameter with the two larger U bolts Attach the radiometer support arm to the mounting plate with the two smaller U bolts The radiometer support arm does not need to be level Fasten the cable to the pipe or rod with tape or plastic ties to prevent strain on the wires and damage to the instrument CAUTION Ensure that th...

Page 4: ...e 500 mV range for the 21X or CR7 The slow integration with 60 Hz rejection yields a more noise free reading For still air net radiation Q can be computed from the thermopile voltage Vt by If Vt 0 Q Wm 2 Vt mV x Fp If Vt 0 Q Wm 2 Vt mV x Fn where Fp and Fn are the positive and negative calibration factors respectively The calibration factors and serial number are given on a label under the sensor ...

Page 5: ...s using fixed correction factors of 1 045 for positive fluxes and 1 000 for negative fluxes If the wind speed is measured the functions above can be programmed into the datalogger to give a real time correction of net radiation for the effects of wind speed Note that the wind speed is expressed in units of meters per second If the wind speed is measured in units other than meters per second conver...

Page 6: ...nd input location assignments On the 21X and CR7 use 500 mV input range For a Single Ended measurement use Instruction 1 3 3 PROGRAMMING EXAMPLE WITH DYNAMIC WIND SPEED CORRECTION The following CR10 X program measures an R M Young wind sentry anemometer model 03101 and a Q 7 1 The wind speed is used to give a real time wind correction to net radiation The wind speed must be measured before the win...

Page 7: ...rections 10 Beginning of Subroutine P85 1 2 Subroutine 2 11 Z X F P37 1 1 X Loc ws_m_s 2 00174 F 3 4 Z Loc A 12 Z X F P34 1 4 X Loc A 2 99755 F 3 7 Z Loc Corr_Fact Enter the negative multiplier n nnn 13 Z X F P37 1 2 X Loc Rn_mV 2 n nnn F 3 3 Z Loc Rn_W_m2 14 Z X Y P36 1 3 X Loc Rn_W_m2 2 7 Y Loc Corr_Fact 3 3 Z Loc Rn_W_m2 15 End P95 Proper entries will vary with program and datalogger channel an...

Page 8: ...ng Desiccant Make sure that the desiccant is dry i e still blue and white If it has turned pink replace it with dry desiccant or bake it until it is dry see section 4 1 above If the desiccant is pink only at the tube end nearest the sensor head this indicates a leak somewhere on the sensor Windshields and O rings Check that the windshields and O rings are in good condition and are properly seated ...

Page 9: ... lower windshields are completely seated on the frame around the entire periphery CAUTION Do not attempt to dismantle the instrument body If internal attention is needed contact Campbell Scientific Inc for repair If the windshields become dented remove the dents as follows 1 Remove the vinal cap from the support arm 2 Blow gently into the end plug breather hole to inflate the windshields Remember ...

Page 10: ...f the standard has also been verified using black body chambers Care should however be taken when comparing readings with sensors from different manufacturers or even older models from Radiation Energy Balance Systems This is because in recent years academic studies have reported inadequacies both in the design and calibration of net radiometers from most manufacturers Radiation Energy Balance Sys...

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Page 12: ... 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 rue de Te...

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