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Campbell HFP01SC Instruction Manual

Self-calibrating soil heat flux plate
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MODEL HFP01SC
SELF-CALIBRATING SOIL HEAT FLUX PLATE
INSTRUCTION MANUAL
4/02
COPYRIGHT (c) 2002 CAMPBELL SCIENTIFIC, INC.

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  • Page 1 MODEL HFP01SC SELF-CALIBRATING SOIL HEAT FLUX PLATE INSTRUCTION MANUAL 4/02 COPYRIGHT (c) 2002 CAMPBELL SCIENTIFIC, INC.
  • Page 2 This is a blank page.
  • Page 3 Warranty and Assistance The MODEL HFP01SC SELF-CALIBRATING SOIL HEAT FLUX PLATE 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.
  • Page 4 This is a blank page.

  • Page 5: Table Of Contents

    2. Datalogger Connections for a Differential Measurement ......4 3. Wiring for Example 1 .................5 4. Wiring for Example 2 .................9 5. Wiring for Example 3 ................14 6A. Wiring for Example 4 ................17 6B. Wiring for Example 4 ................17 7. Hukseflux and Campbell Scientific Variable Names........24...

  • Page 7: General Description

    Self-Calibrating Soil Heat Flux Plate 1. General Description The HFP01SC Soil Heat Flux plate consists of a thermopile and a film heater. The thermopile measures temperature gradients across the plate. During the in- situ field calibration, the film heater is used to generate a heat flux through the plate.

  • Page 8: Installation

    Insert the heat flux plate into the horizontal cut. Install the HFP01SC in the soil such that the side with the text NOTE “this side up” is facing the sky.

  • Page 9: Hfp01Sc Plate

    Model HFP01SC Self-Calibrating Soil Heat Flux Plate In order for the HFP01SC to make quality soil heat flux CAUTION measurements, the plate must be in full contact with the soil. Never run the sensors leads directly to the surface. Rather, bury the sensor leads a short distance back from the hole to minimized thermal conduction on the lead wire.

  • Page 10: Example Programs

    4. Wiring Connections to Campbell Scientific dataloggers are given in Tables 1 and 2. The output of the HFP01SC can be measured using a single-ended analog measurement (Instruction 1 or VoltSE()), however, a differential analog measurement (Instruction 2 or VoltDiff()) is recommended.

  • Page 11: Wiring For Example 1

    Model HFP01SC Self-Calibrating Soil Heat Flux Plate TABLE 3. Wiring for Example 1 Description Color CR10(X) Sensor Signal White Sensor Signal Reference Green Shield Clear Heater Resistor Signal Yellow Heater Resistor Signal Reference Purple Shield Clear Power SW12 Power Reference...
  • Page 12 Model HFP01SC Self-Calibrating Soil Heat Flux Plate ;Factory calibration in W/(m^2 mV) = 1000/sensitivity. 4: Z=F (P30) 1: 1 ; <- Enter the unique calibration here 2: 0 Exponent of 10 3: 3 Z Loc [ cal 5: End (P95) ;Use data from the larger measurement range.
  • Page 13 Model HFP01SC Self-Calibrating Soil Heat Flux Plate 16: Sample (P70) 1: 1 Reps 2: 3 Loc [ cal ;Add other processing here. ;Call calibration routine. 17: Do (P86) 1: 8 Call Subroutine 8 *Table 2 Program 02: 0 Execution Interval (seconds) *Table 3 Subroutines ;Calibration routine.
  • Page 14 Model HFP01SC Self-Calibrating Soil Heat Flux Plate ;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...

  • Page 15: Wiring

    Model HFP01SC Self-Calibrating Soil Heat Flux Plate 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...
  • Page 16 Model HFP01SC Self-Calibrating Soil Heat Flux Plate Example 2. 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...
  • Page 17 Model HFP01SC Self-Calibrating Soil Heat Flux Plate ;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.
  • Page 18 Model HFP01SC Self-Calibrating Soil Heat Flux Plate 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 ]...
  • Page 19 Model HFP01SC Self-Calibrating Soil Heat Flux Plate 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...

  • Page 20: Wiring For Example 3

    Model HFP01SC Self-Calibrating Soil Heat Flux Plate TABLE 5. Wiring for Example 3 Description Color CR5000 Sensor Signal #1 White Sensor Signal Reference #1 Green Shield #1 Clear Sensor Signal #2 White Sensor Signal Reference #2 Green Shield #2 Clear...
  • Page 21 Model HFP01SC Self-Calibrating Soil Heat Flux Plate Example 3. Sample CR5000 Program Using a Differential Measurement Instruction 'CR5000 Const CAL_INTERVAL = 180 'HFP01SC calibration interval in minutes. '*** Variables *** Public shf(4) Alias shf(1) = hfp01sc_1 Alias shf(2) = hfp01sc_2...
  • Page 22 = (V_Rf_180(j)*V_Rf_180(j)*128.7)/ABS (((shf_mV_0(j)+shf_mV_end(j))/2)-shf_mV_180) Next j EndIf 'Stop filtering data. shf_cal_on = FALSE EndSub BeginProg 'HFP01SC factory calibration in W/(m^2 mV) = 1000/sensitivity. shf_cal(1) = 1 'Unique value. shf_cal(2) = 1 'Unique value. shf_cal(3) = 1 'Unique value. shf_cal(4) = 1 'Unique value.

  • Page 23: A. Wiring For Example 4

    Model HFP01SC Self-Calibrating Soil Heat Flux Plate TABLE 6A. Wiring for Example 4 Description Color CR10X A21REL-12 Sensor Signal #1 White Sensor Signal #2 White Sensor Signal #3 White Sensor Signal #4 White Sensor Signal #5 White Sensor Signal #6...
  • Page 24 Model HFP01SC Self-Calibrating Soil Heat Flux Plate Example 4. Sample CR10X Program Using External Power and Relay ;{CR10X} *Table 1 Program 01: 1 Execution Interval (seconds) ;Measure HFP01SC on smallest range. 1: Volt (SE) (P1) 1: 6 Reps 2: 22 7.5 mV 60 Hz Rejection Range...
  • Page 25 Model HFP01SC Self-Calibrating Soil Heat Flux Plate 8: Z=F (P30) 1: 1 ;<- Enter the unique calibration for plate 5 here 2: 0 Exponent of 10 3: 17 Z Loc [ cal_5 9: Z=F (P30) 1: 1 ;<- Enter the unique calibration for plate 6 here...
  • Page 26 Model HFP01SC Self-Calibrating Soil Heat Flux Plate ;Call calibration routine. 21: 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.
  • Page 27 Model HFP01SC Self-Calibrating Soil Heat Flux Plate ;Measure voltage across current shunt 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: 7 SE Channel...
  • Page 28 Model HFP01SC Self-Calibrating Soil Heat Flux Plate 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...

  • Page 29: Soil Heat Flux And Storage

    Model HFP01SC Self-Calibrating Soil Heat Flux Plate 26 mV_180_2 27 mV_180_3 28 mV_180_4 29 mV_180_5 30 mV_180_6 31 mV_end_1 32 mV_end_2 33 mV_end_3 34 mV_end_4 35 mV_end_5 36 mV_end_6 37 V_Rf_1 38 V_Rf_2 39 V_Rf_3 40 V_Rf_4 41 V_Rf_5 42 V_Rf_6...

  • Page 30: In-Situ Calibration Theory

    Eq. (4). ∆ T C d 7. Maintenance The HFP01SC requires minimal maintenance. Check the sensor leads monthly for rodent damage. 8. In-Situ Calibration Theory For detailed information on the theory of the in-situ calibration, see the Theory section of the Hukseflux manual or visit the application section of the Hukseflux web site at http://www.hukseflux.com/heat%20flux/applic&spec.pdf.
  • Page 31 Model HFP01SC Self-Calibrating Soil Heat Flux Plate 9. References Hanks, R. J., and G. L. Ashcroft, 1980: Applied Soil Physics: Soil Water and Temperature Application. Springer-Verlag, 159 pp. Klute, A., 1986: Method of Soil Analysis. No. 9, Part 1, Sections 13 and 21, American Society of Agronomy, Inc., Soil Science Society of America,...
  • Page 32 Model HFP01SC Self-Calibrating Soil Heat Flux Plate This is a blank page.

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