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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
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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Summary of Contents for Campbell HFP01SC

  • Page 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 ,...
  • Page 3 Campbell pricelist or product manual. Products not manufactured, but that are re-sold by Campbell, are warranted only to the limits extended by the original manufacturer. Batteries, fine-wire thermocouples, desiccant, and other consumables have no warranty.
  • Page 4 SCIENTIFIC, INC., phone (435) 227-9000. After an applications engineer determines the nature of the problem, an RMA number will be issued. Please write this number clearly on the outside of the shipping container. Campbell Scientific's shipping address is: CAMPBELL SCIENTIFIC, INC.

  • Page 5: Table Of Contents

    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 Wiring for Example 4..............19 6-7. Datalogger-to-A21REL-12 Wiring for Example 4........19 6-8. Hukseflux and Campbell Scientific Variable Names ......27...

  • Page 7: Introduction

    ResourceDVD. 4. Overview 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: Specifications

    A TCAV Averaging Soil Thermocouple is used to measure the temporal change in temperature of the soil layer above the HFP01SC. Finally, a CS650, CS655, or CS616 water content reflectometer is used to measure the soil water content. The temporal change in soil temperature and soil water content are used to compute the soil storage term.
  • Page 9 Duration of Calibration: 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.

  • Page 10: Installation

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

  • Page 11: Hfp01Sc Plate

    Model HFP01SC Self-Calibrating Soil Heat Flux Plate Signal (White) Signal Reference (Green) Shield (Clear) Heater Resistor Signal (Yellow) Heater Resistor Signal Reference (Purple) Shield (Clear) Power (Red) Power Reference (Black) FIGURE 6-2. HFP01SC plate TABLE 6-1. Datalogger Connections for a Single-Ended Measurement...

  • Page 12: Datalogger Connections For A Differential Measurement

    6.2 Wiring Connections to Campbell Scientific 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.

  • Page 13: Wiring For Example 1

    Model HFP01SC Self-Calibrating Soil Heat Flux Plate TABLE 6-3. Wiring for Example 1 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 14 'Online mean output interval in minutes. Const CAL_INTERVAL = 1440 'HFP01SC insitu calibration interval (minutes). Const END_CAL = OUTPUT_INTERVAL-1 'End HFP01SC insitu calibration one minute before the next Output. Const HFP01SC_CAL_1 = 15 'Unique multiplier for HFP01SC #1 (1000/sensitivity). Const HFP01SC_CAL_2 = 15 'Unique multiplier for HFP01SC #2 (1000/sensitivity).

  • Page 15: Wiring For Example 2

    Model HFP01SC Self-Calibrating Soil Heat Flux Plate BeginProg 'HFP01SC factory calibration in W/(m^2 mV) = 1000/sensitivity. shf_cal(1) = HFP01SC_CAL_1 shf_cal(2) = HFP01SC_CAL_2 shf_cal(3) = HFP01SC_CAL_3 shf_cal(4) = HFP01SC_CAL_4 Scan (100,mSec,3,0) 'Measure the HFP01SC soil heat flux plates. VoltDiff (shf_mV(1),4,mV50C,11,TRUE,200,250,1,0) 'Apply calibration to HFP01SC soil heat flux plates.
  • Page 16 Model HFP01SC Self-Calibrating Soil Heat Flux Plate Example 2. Sample CR10(X) Program Using a Single-Ended Measurement Instruction ;{CR10X} *Table 1 Program 01: 1 Execution Interval (seconds) ;Measure HFP01SC on smaller range. 1: Volt (SE) (P1) 1: 1 Reps 2: 22 7.5 mV 60 Hz Rejection Range...
  • 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 ;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 ]...
  • Page 19 Model HFP01SC Self-Calibrating Soil Heat Flux Plate ;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: 28 Set Flag 8 Low ;Compute in-situ calibration.

  • Page 20: Wiring

    Model HFP01SC Self-Calibrating Soil Heat Flux Plate -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 TABLE 6-5. Wiring for Example 3 Description Color CR23X Sensor Signal White Sensor Signal Reference...
  • Page 21 Model HFP01SC Self-Calibrating Soil Heat Flux Plate ;Load in the factory calibration. 3: If (X<=>F) (P89) 1: 3 X Loc [ cal 2: 1 3: 0 4: 30 Then Do ;Factory calibration in W/(m^2 mV) = 1000/sensitivity. 4: Z=F (P30) 1: 1 ;...
  • Page 22 Model HFP01SC Self-Calibrating Soil Heat Flux Plate 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.
  • Page 23 Model HFP01SC Self-Calibrating Soil Heat Flux Plate ;Measure voltage across current shunt resistor during calibration. ;This measurement is used to compute power. 8: Volt (Diff) (P2) 1: 1 Reps 2: 25 5000 mV, 60 Hz Reject, Fast Range 3: 10...
  • Page 24 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 25: Sensor Wiring For Example 4

    Model HFP01SC Self-Calibrating Soil Heat Flux Plate TABLE 6-6. Sensor 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 26 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 27 Model HFP01SC Self-Calibrating Soil Heat Flux Plate 7: Z=F (P30) 1: 1 ;<- Enter the unique calibration for plate 4 here. 2: 0 Exponent of 10 3: 16 Z Loc [ cal_4 8: Z=F (P30) 1: 1 ;<- Enter the unique calibration for plate 5 here.
  • Page 28 Model HFP01SC Self-Calibrating Soil Heat Flux Plate ;Do not include that calibration data in the soil heat flux. 20: If Flag/Port (P91) 1: 18 Do if Flag 8 is High 2: 19 Set Intermed. Proc. Disable Flag High (Flag 9)
  • Page 29 Model HFP01SC Self-Calibrating Soil Heat Flux Plate ;Used to filter data during and after calibration. 7: Do (P86) 1: 18 Set Flag 8 High 8: End (P95) ;End site calibration three minutes after calibration started. 9: If time is (P92)
  • Page 30 Model HFP01SC Self-Calibrating Soil Heat Flux Plate 18: Beginning of Loop (P87) 1: 0 Delay 2: 6 Loop Count 19: Z=X (P31) 1: 7 -- X Loc [ shf_mV_1 ] 2: 31 -- Z Loc [ mV_end_1 ] 20: Z=X*Y (P36)

  • Page 31: Soil Heat Flux And Storage

    Model HFP01SC Self-Calibrating Soil Heat Flux Plate 5 shf_5 0 0 0 6 shf_6 0 0 0 7 shf_mV_1 1 5 2 8 shf_mV_2 1 0 1 9 shf_mV_3 1 0 1 10 shf_mV_4 1 0 1 11 shf_mV_5 1 0 1...

  • Page 32: In-Situ Calibration Theory

    Model HFP01SC Self-Calibrating Soil Heat Flux Plate ρ θ ρ θ ρ C ρ θ θ ρ is the heat capacity of moist soil, ρ is bulk density, ρ where C is the density is the heat capacity of a dry mineral soil, θ...

  • Page 33: Hukseflux And Campbell Scientific Variable Names

    Voltage Across fixed V_Rf 10 Ω resistor 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.
  • Page 34 Model HFP01SC Self-Calibrating Soil Heat Flux Plate...
  • Page 36 Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 North Logan, Utah 84321 UNITED STATES www.campbellsci.com • info@campbellsci.com Campbell Scientific Africa Pty. Ltd. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA www.csafrica.co.za • cleroux@csafrica.co.za Campbell Scientific Australia Pty. Ltd. (CSA)

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