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Campbell HFP01 Instruction Manual

Soil heat flux plate
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Model HFP01
Soil Heat Flux Plate
Revision: 7/12
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 HFP01

  • Page 1 Model HFP01 Soil Heat Flux Plate Revision: 7/12 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: Warranty

    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 A.1 General Theory ................... A-1 A.2 Extended Theory................. A-2 Figures 6-1. Placement of heat flux plates..............3 6-2. HFP01 plate to datalogger connections...........4 A-1. General characteristics of a heat flux sensor ........A-1 A-2. Deflection error ................. A-2 Tables 6-1. Datalogger Connections for a Single-Ended Measurement ....5 6-2.

  • Page 7: Cautionary Statements

    Model HFP01 Soil Heat Flux Plate 1. Introduction The HFP01 outputs a voltage signal that is proportional to the heat flux of the surrounding medium (usually soil). It is typically used for energy-balance or Bowen-ratio flux systems. At least two sensors are required for each site to provide spatial averaging.

  • Page 8: Specifications

    Model HFP01 Soil Heat Flux Plate The HFP01’s output is in millivolts. To convert this measured voltage to heat flux, it must be divided by the plate’s calibration constant. A unique calibration constant is supplied with each sensor. To get the soil heat flux at the surface, use at least two HFP01s to measure soil heat flux at a depth of 8 cm;...

  • Page 9: Installation

    Sensor Thermal Resistance: <6.25 x 10 2 . 5 c m 2 c m Partial emplacement of the HFP01 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 8 cm below the surface into the undisturbed face of the hole. Insert the heat flux plate into the horizontal cut. Install the HFP01 in the soil such that the side with the red label NOTE is facing the sky and the side with a blue label facing the soil.
  • Page 11 To calculate the calibration multiplier, divide 1000 by the nominal calibration sensitivity (i.e., 1000/sensitivity). The nominal calibration sensitivity is unique for each HFP01. Each sensor is accompanied with a calibration certificate and has a label on it with the calibration values. The label is located on the pigtail end of the sensor leads.
  • Page 12 Example 1. Sample CR3000 Program using Differential Measurement Instructions 'CR3000 Series Datalogger 'Copyright (c) 2007, Campbell Scientific, Inc. All rights reserved. 'This datalogger program measures two HFP01 Hukseflux soil heat flux sensors '*** Wiring *** HFP01 #1 signal (white) HFP01 #1 signal reference (green)
  • Page 13 NOTE The instruction below does not store data in final storage. P92, P77, and an output processing instruction are required to store the data permanently. ;Measure the HFP01 Soil Heat Flux plate. 01: Volt (Diff) (P2) 1: 1 Reps 2: 21 10 mV, 60 Hz Reject, Slow Range ;CR510, CR10(X) (7.5 mV);...
  • Page 14 7. Maintenance The HFP01 requires minimal maintenance. Check the sensor leads monthly for rodent damage. Recalibrate the HFP01 for every two years of continuous use. Obtain an RMA number before returning the HFP01 to Campbell Scientific for calibration. 8. References Hanks, R.

  • Page 15: Appendix A. General Theory Of Heat Flux Sensors

    When used for measuring soil heat flux, heat flux sensors such as the HFP01 reach a limited level of accuracy. This has to do with the fact that thermal parameters of soil are constantly changing (soil moisture content) and with the fact that the ambient temperature is not fixed.
  • Page 16 Appendix A. General Theory of Heat Flux Sensors better if the soil conditions are closer to the reference conditions (see the sensor specifications) and, in an actual experiment, the expected error range will probably be ±10%. The reference conditions for the calibration are a thermal conductivity of 0.8 W/mK and a nominal temperature of 20°C.
  • Page 18 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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