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Model HFP01SC Self-Calibrating

Soil Heat Flux Plate

Revision: 8/12

C o p y r i g h t   ©   2 0 0 2 - 2 0 1 2

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Содержание HFP01SC

Страница 1: ...Model HFP01SC Self Calibrating Soil Heat Flux Plate Revision 8 12 C o p y r i g h t 2 0 0 2 2 0 1 2 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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Страница 3: ...removing reinstalling and shipping defective products to Campbell Campbell will return such products by surface carrier prepaid within the continental United States of America To all other locations Campbell will return such products best way CIP Port of Entry INCOTERM 2010 prepaid This warranty shall not apply to any products which have been subjected to modification misuse neglect improper servi...

Страница 4: ...ng container Campbell Scientific s shipping address is CAMPBELL SCIENTIFIC INC RMA _____ 815 West 1800 North Logan Utah 84321 1784 For all returns the customer must fill out a Statement of Product Cleanliness and Decontamination form and comply with the requirements specified in it The form is available from our web site at www campbellsci com repair A completed form must be either emailed to repa...

Страница 5: ...ramming 6 6 4 Soil Heat Flux and Storage 25 6 5 In Situ Calibration Theory 26 7 Maintenance 27 8 References 27 Figures 6 1 Placement of heat flux plates 3 6 2 HFP01SC plate 5 Tables 6 1 Datalogger Connections for a Single Ended Measurement 5 6 2 Datalogger Connections for a Differential Measurement 6 6 3 Wiring for Example 1 7 6 4 Wiring for Example 2 9 6 5 Wiring for Example 3 14 6 6 Sensor Wirin...

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Страница 7: ...ific applications engineer Although the HFP01SC is rugged it should be handled as a precision scientific instrument 3 Initial Inspection Upon receipt of the HFP01SC inspect the packaging and contents for damage File damage claims with the shipping company The model number and cable length are printed on a label at the connection end of the cable Check this information against the shipping document...

Страница 8: ...e second is the heater input cable Two analog inputs are required to measure the HFP01SC L This manual refers to the sensor as the HFP01SC The sensor s cable can terminate in Pigtails that connect directly to a Campbell Scientific datalogger option PT Connector that attaches to a prewired enclosure option PW Refer to www campbellsci com prewired enclosures for more information 5 Specifications Fea...

Страница 9: ...g Sensitivity nominal 50 μV W 1 m 2 Sensor Resistance nominal 2 Ω Heater Resistance nominal 100 Ω Duration of Calibration 3 min 15 W typically done every 3 to 6 hours Weight without Cable 200 g 7 05 oz Partial emplacement of the HFP01SC and the TCAV sensors is shown for illustration purposes All sensors must be completely inserted into the soil face before the hole is backfilled FIGURE 6 1 Placeme...

Страница 10: ...ct so that is can be replaced with minimal disruption The sensors are installed in the undisturbed face of the hole Measure the sensor depths from the top of the hole With a small knife make a horizontal cut eight centimeters below the surface into the undisturbed face of the hole Insert the heat flux plate into the horizontal cut Install the HFP01SC in the soil such that the side with the text th...

Страница 11: ...easurement Description Color CR10X CR3000 CR5000 CR23X CR800 CR850 CR1000 Sensor Signal White Single Ended Input Single Ended Input Single Ended Input Sensor Signal Reference Green AG Shield Clear G Heater Resistor Signal Yellow Single Ended Input Single Ended Input Single Ended Input Heater Resistor Signal Reference Purple AG Shield Clear G Power Red SW12 SW12 SW12 Power Reference Black G G G Ext...

Страница 12: ...ific dataloggers are given in Tables 6 1 and 6 2 The output of the HFP01SC can be measured using a single ended analog measurement VoltSE or Instruction 1 however a differential analog measurement VoltDiff or Instruction 2 is recommended The wiring convention is that the white wire is positive with respect to the green wire when energy is flowing through the transducer from the side with the text ...

Страница 13: ...nal Reference 4 Green 14L Shield 4 Clear Heater Resistor Signal 1 Yellow 17H Heater Resistor Signal Reference 1 Purple 17L Shield 1 Clear Power 1 Red SW12 Power Reference 1 Black G Heater Resistor Signal 2 Yellow 18H Heater Resistor Signal Reference 2 Purple 18L Shield 2 Clear Power 2 Red SW12 Power Reference 2 Black G Heater Resistor Signal 3 Yellow 19H Heater Resistor Signal Reference 3 Purple 1...

Страница 14: ...p01sc_4 Units shf W m 2 Public shf_cal 4 Units shf_cal W m 2 mV HFP01SC calibration variables Dim shf_mV 4 Dim shf_mV_run 4 Dim shf_mV_0 4 Dim shf_mV_180 4 Dim shf_mV_end 4 Dim V_Rf 4 Dim V_Rf_run 4 Dim V_Rf_180 4 Dim shf_cal_on As Boolean Dim sw12_state As Boolean State of the switched 12Vdc port Dim j DataTable mean TRUE 100 DataInterval 0 OUTPUT_INTERVAL Min 10 Average 4 hfp01sc_1 IEEE4 shf_cal...

Страница 15: ...al j Next j Power the HFP01SC heaters PortSet 9 sw12_state Measure voltage across the heater Rf_V VoltSe V_Rf 1 4 mV5000 33 TRUE 200 250 0 001 0 Maintain a 100 sample running average AvgRun shf_mV_run 1 4 shf_mV 1 100 AvgRun V_Rf_run 1 4 V_Rf 1 100 CallTable mean Call hfp01sc_cal NextScan EndProg TABLE 6 4 Wiring for Example 2 Description Color CR10 X Sensor Signal White 1H Sensor Signal Reference...

Страница 16: ... Measure HFP01SC on larger range 2 Volt SE P1 1 1 Reps 2 23 25 mV 60 Hz Rejection Range 3 1 SE Channel 4 8 Loc shf_mV_a 5 1 Mult 6 0 Offset Load in the factory calibration 3 If X F P89 1 3 X Loc cal 2 1 3 0 F 4 30 Then Do Factory calibration in W m 2 mV 1000 sensitivity 4 Z F P30 1 1 F Enter the unique calibration here 2 0 Exponent of 10 3 3 Z Loc cal 5 End P95 Use data from the larger measurement...

Страница 17: ...t 0000 12 Resolution P78 1 1 High Resolution Do not include the calibration data in the soil heat flux 13 If Flag Port P91 1 18 Do if Flag 8 is High 2 19 Set Intermed Proc Disable Flag High Flag 9 14 Average P71 1 1 Reps 2 1 Loc shf 15 Do P86 1 29 Set Intermed Proc Disable Flag Low Flag 9 16 Sample P70 1 1 Reps 2 3 Loc cal Add other processing here Call calibration routine 17 Do P86 1 8 Call Subro...

Страница 18: ...lag 8 High 6 End P95 End site calibration three minutes after calibration started 7 If time is P92 1 4 Minutes Seconds into a 2 180 Interval same units as above 3 30 Then Do Measure voltage across current shunt resistor 10 ohm 1 0 25 W 50 ppm deg C during calibration This measurement is used to compute power 8 Volt SE P1 1 1 Reps 2 25 2500 mV 60 Hz Rejection Range 3 2 SE Channel 4 7 Loc V_Rf 5 001...

Страница 19: ...Loc shf_mV 2 6 Z Loc mV_end 15 Z X Y P36 1 7 X Loc V_Rf 2 7 Y Loc V_Rf 3 3 Z Loc cal 16 Z X F P37 1 3 X Loc cal 2 128 7 F 3 3 Z Loc cal 17 Z X Y P33 1 4 X Loc mV_0 2 6 Y Loc mV_end 3 9 Z Loc work 18 Z X F P37 1 9 X Loc work 2 5 F 3 9 Z Loc work 19 Z X Y P35 1 9 X Loc work 2 5 Y Loc mV_180 3 9 Z Loc work 20 Z ABS X P43 1 9 X Loc work 2 9 Z Loc work 21 Z X Y P38 1 3 X Loc cal 2 9 Y Loc work 3 3 Z Lo...

Страница 20: ...istor Signal Reference Purple 10L Shield Clear Power Red SW12 Power Reference Black G Example 3 Sample CR23X Program Using a Differential Measurement Instruction CR23X Table 1 Program 01 1 Execution Interval seconds Measure HFP01SC on smaller range 1 Volt Diff P2 1 1 Reps 2 21 10 mV 60 Hz Reject Slow Range 3 9 DIFF Channel 4 2 Loc shf_mV 5 1 Mult 6 0 Offset Measure HFP01SC on larger range 2 Volt D...

Страница 21: ... 4 30 Then Do 7 Z X P31 1 8 X Loc shf_mV_a 2 2 Z Loc shf_mV 8 End P95 Apply custom calibration to the raw soil heat flux measurement 9 Z X Y P36 1 2 X Loc shf_mV 2 3 Y Loc cal 3 1 Z Loc shf Output data 10 If time is P92 1 0 Minutes Seconds into a 2 20 Interval same units as above 3 10 Set Output Flag High Flag 0 11 Real Time P77 1 0110 Day Hour Minute midnight 0000 12 Resolution P78 1 1 High Resol...

Страница 22: ...ration routine 1 Beginning of Subroutine P85 1 8 Subroutine 8 Perform in situ calibratation 2 If time is P92 1 1 Minutes Seconds into a 2 180 Interval same units as above 3 30 Then Do 3 Z X P31 1 2 X Loc shf_mV 2 4 Z Loc mV_0 Begin heating for calibration 4 Do P86 1 49 Turn On Switched 12V Used to filter data during and after calibration 5 Do P86 1 118 Set Flag 18 High 6 End P95 End site calibrati...

Страница 23: ... off the soil heat flux plate heater 10 Do P86 1 59 Turn Off Switched 12V 11 End P95 Stop filtering data 12 If time is P92 1 39 Minutes Seconds into a 2 180 Interval same units as above 3 30 Then Do 13 Do P86 1 218 Set Flag 18 Low Compute in situ clibration 14 Z X P31 1 2 X Loc shf_mV 2 6 Z Loc mV_end 15 Z X Y P36 1 7 X Loc V_Rf 2 7 Y Loc V_Rf 3 3 Z Loc cal 16 Z X F P37 1 3 X Loc cal 2 128 7 F 3 3...

Страница 24: ...9 X Loc work 2 5 Y Loc mV_180 3 9 Z Loc work 20 Z ABS X P43 1 9 X Loc work 2 9 Z Loc work 21 Z X Y P38 1 3 X Loc cal 2 9 Y Loc work 3 3 Z Loc cal 22 End P95 23 End P95 End Program Input Locations 1 shf 2 shf_mV 3 cal 4 mV_0 5 mV_180 6 mV_end 7 V_Rf 8 shf_mV_a 9 work 18 ...

Страница 25: ...Heater Resistor Signal 5 Yellow 6H Heater Resistor Signal 6 Yellow 6L All Heater Resistor Signal References Purple AG All Shields Clear G Sensor Power 1 Red REL 1 NO Sensor Power 2 Red REL 1 NO Sensor Power 3 Red REL 2 NO Sensor Power 4 Red REL 2 NO Sensor Power 5 Red REL 3 NO Sensor Power 6 Red REL 3 NO All Power Reference Black G TABLE 6 7 Datalogger to A21REL 12 Wiring for Example 4 Description...

Страница 26: ...e 2 Volt SE P1 1 6 Reps 2 23 25 mV 60 Hz Rejection Range 3 1 SE Channel 4 44 Loc shf_mV_1a 5 1 Mult 6 0 Offset Load in the factory calibration 3 If X F P89 1 13 X Loc cal_1 2 1 3 0 F 4 30 Then Do Factory calibration in W m 2 mV 1000 sensitivity 4 Z F P30 1 1 F Enter the unique calibration for plate 1 here 2 0 Exponent of 10 3 13 Z Loc cal_1 5 Z F P30 1 1 F Enter the unique calibration for plate 2 ...

Страница 27: ...ning of Loop P87 1 0 Delay 2 6 Loop Count Use data from the larger measurement range 12 If X F P89 1 7 X Loc shf_mV_1 2 4 3 99990 F 4 30 Then Do 13 Z X P31 1 44 X Loc shf_mV_1a 2 7 Z Loc shf_mV_1 14 End P95 Apply custom calibration to raw soil heat flux measurement 15 Z X Y P36 1 7 X Loc shf_mV_1 2 13 Y Loc cal_1 3 1 Z Loc shf_1 16 End P95 Output data 17 If time is P92 1 0 Minutes Seconds into a 2...

Страница 28: ...6 Reps 2 13 Loc cal_1 Add other processing here Call calibration routine 24 Do P86 1 8 Call Subroutine 8 Table 2 Program 02 0 Execution Interval seconds Table 3 Subroutines Calibration routine 1 Beginning of Subroutine P85 1 8 Subroutine 8 Perform in situ calibratation 2 If time is P92 1 1 Minutes Seconds into a 2 180 Interval same units as above 3 30 Then Do 3 Beginning of Loop P87 1 0 Delay 2 6 ...

Страница 29: ...nt resistor during calibration This measurement is used to compute power 10 Volt SE P1 1 6 Reps 2 25 2500 mV 60 Hz Rejection Range 3 SE Channel 4 37 Loc V_Rf_1 5 001 Mult 6 0 Offset 11 Beginning of Loop P87 1 0 Delay 2 6 Loop Count 12 Z X P31 1 7 X Loc shf_mV_1 2 25 Z Loc mV_180_1 13 End P95 Turn off the soil heat flux plate heaters 14 Do P86 1 58 Set Port 8 Low 15 End P95 Compute in situ calibrat...

Страница 30: ...al_1 2 128 7 F 3 13 Z Loc cal_1 22 Z X Y P33 1 19 X Loc mV_0_1 2 31 Y Loc mV_end_1 3 43 Z Loc work 23 Z X F P37 1 43 X Loc work 2 5 F 3 43 Z Loc work 24 Z X Y P35 1 43 X Loc work 2 25 Y Loc mV_180_1 3 43 Z Loc work 25 Z ABS X P43 1 43 X Loc work 2 43 Z Loc work 26 Z X Y P38 1 13 X Loc cal_1 2 43 Y Loc work 3 13 Z Loc cal_1 27 End P95 28 End P95 29 End P95 End Program Input Locations 1 shf_1 1 1 1 ...

Страница 31: ...37 V_Rf_1 5 2 1 38 V_Rf_2 9 0 1 39 V_Rf_3 9 0 1 40 V_Rf_4 9 0 1 41 V_Rf_5 9 0 1 42 V_Rf_6 17 0 1 43 work 1 4 4 44 shf_mV_1a 5 1 1 45 shf_mV_2a 9 0 1 46 shf_mV_3a 9 0 1 47 shf_mV_4a 9 0 1 48 shf_mV_5a 9 0 1 49 shf_mV_6a 17 0 1 6 4 Soil Heat Flux and Storage The soil heat flux at the surface is calculated by adding the measured flux at a fixed depth d to the energy stored in the layer above the heat...

Страница 32: ...oil water content is measured by the CS616 water content reflectometer A value of 840 J kg 1 K 1 for the heat capacity of dry soil is a reasonable value for most mineral soils Hanks and Ashcroft 1980 The storage term is then given by Eq 3 and the soil heat flux at the surface is given by Eq 4 S T C d t s s Δ 3 G G sfc cm S 8 4 6 5 In Situ Calibration Theory For detailed information on the theory o...

Страница 33: ...bration at t 180 seconds V 180 mV_180 Output of Sensor after calibration and just before output V 360 mV_end Voltage Across fixed 10 Ω resistor Vcur V_Rf 7 Maintenance The HFP01SC requires minimal maintenance Check the sensor leads monthly for rodent damage 8 References Hanks R J and G L Ashcroft 1980 Applied Soil Physics Soil Water and Temperature Application Springer Verlag 159 pp Klute A 1986 M...

Страница 34: ...Model HFP01SC Self Calibrating Soil Heat Flux Plate 28 ...

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Страница 36: ...entific Canada Corp CSC 11564 149th Street NW Edmonton Alberta T5M 1W7 CANADA www campbellsci ca dataloggers campbellsci ca Campbell Scientific Centro Caribe S A CSCC 300 N Cementerio Edificio Breller Santo Domingo Heredia 40305 COSTA RICA www campbellsci cc info campbellsci cc Campbell Scientific Ltd CSL Campbell Park 80 Hathern Road Shepshed Loughborough LE12 9GX UNITED KINGDOM www campbellsci c...

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