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Model HFP01 Soil Heat Flux Plate 

7.3  Programming 

Short Cut 

is the best source for up-to-date data logger programming code for 

the HFP01. 

If your data acquisition requirements are simple and you are connecting the 

sensor to a pulse terminal, you can probably create and maintain a data logger 

program exclusively with 

Short Cut

. If your data acquisition needs are more 

complex, the files that 

Short Cut 

creates are a great source for programming 

code to start a new program or add to an existing custom program. 

Short Cut 

cannot edit programs after they are imported and edited 

in 

CRBasic Editor

Short Cut 

tutorial is available in Section 

4

QuickStart

 

(p. 1)

. If you wish to 

import 

Short Cut 

code into 

CRBasic Editor 

to create or add to a customized 

program, follow the procedure in Appendix 

A

Importing Short Cut Code Into 

CRBasic Editor

 

(p. A-1)

Programming basics for CRBasic data loggers are in this section. A complete 

program example for a CRBasic data logger can be found in Appendix 

B

Example Program

 

(p. B-1)

. Programming basics and programming examples for 

Edlog data loggers are provided at 

www.campbellsci.com/old-manuals

 

The HFP01 is measured using either a single-ended (

VoltSE

) or differential 

(

VoltDiff

) instruction. The differential measurement is recommended.  

Syntax of the 

VoltDiff()

 instruction is: 

VoltDiff

(Dest, Reps, Range, DiffChan, RevDiff, SettlingTime, 

Integ/FNotch, Mult, Offset) 

Syntax of the 

VoltSE()

 instruction is: 

VoltSE

(Dest, Reps, Range, SEChan, MeasOff, SettlingTime, 

Integ/FNotch, Mult, Offset) 

For the multiplier, divide 1000 by the nominal calibration sensitivity 

(1000/sensitivity). The nominal calibration 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 

wires. 

7.4  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 flux plates. The 

specific heat of the soil and the change in soil temperature, 

T

s

, over the output 

interval, t, are required to calculate the stored energy. 

The heat capacity of the soil is calculated by adding the specific heat of the dry 

soil to that of the soil water. The values used for specific heat of dry soil and 

water are on a mass basis. The heat capacity of the moist soil is given by: 

NOTE 

Содержание HFP01

Страница 1: ...HFP01 Soil Heat Flux Plate Revision 1 20 Copyright 2002 2020 Campbell Scientific Inc...

Страница 2: ...ucts to CSI CSI will return such Products by surface carrier prepaid within the continental United States of America To all other locations CSI will return such Products best way CIP port of entry per...

Страница 3: ...ing 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 co...

Страница 4: ...beginning work Wear a hardhat and eye protection and take other appropriate safety precautions while working on or around tripods and towers Do not climb tripods or towers at any time and prohibit cl...

Страница 5: ...spection 1 4 QuickStart 1 5 Overview 3 6 Specifications 4 7 Installation 4 7 1 Placement in Soil 5 7 2 Wiring 6 7 3 Programming 7 7 4 Soil Heat Flux and Storage 7 8 Maintenance 8 9 References 8 Append...

Страница 6: ...1 General characteristics of a heat flux sensor C 1 C 2 Deflection error C 2 Tables 7 1 Wire Color Function and Data Logger Connections 6 B 1 Wiring for CRBasic Example B 1 B 1 CRBasic Example B 1 Sa...

Страница 7: ...is rugged it should be handled as a precision scientific instrument 3 Initial Inspection Upon receipt of the HFP01 inspect the packaging and contents for damage File damage claims with the shipping co...

Страница 8: ...ate the sensor in the select Sensors Soil folder Double click HFP01 Soil Heat Flux Plate Type the sensitivity provided on the calibration sheet this value is sensor specific 4 Click the Wiring tab to...

Страница 9: ...splay in LoggerNet RTDAQ PC400 or PC200W to make sure it is making reasonable measurements 5 Overview The HFP01 Soil Heat Flux Plate uses a thermopile to measure temperature gradients across its plate...

Страница 10: ...s and principles of operation of heat flux sensors is shown in Appendix C General Theory of Heat Flux Sensors p C 1 Features Ideal for energy balance or Bowen ratio systems Compatible with Campbell Sc...

Страница 11: ...ors 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 16 cm below the surface into the undisturbed face of t...

Страница 12: ...ABLE 7 1 Wire Color Function and Data Logger Connections Wire Color Wire Function Data Logger Single Ended Measurement Data Logger Differential Measurement White Signal U configured for single ended a...

Страница 13: ...ded at www campbellsci com old manuals The HFP01 is measured using either a single ended VoltSE or differential VoltDiff instruction The differential measurement is recommended Syntax of the VoltDiff...

Страница 14: ...at 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...

Страница 15: ...can now be edited for additional refinement Once the file is edited with CRBasic Editor Short Cut can no longer be used to edit the program it created 2 To add the Short Cut wiring information into t...

Страница 16: ...ogger This data logger program measures two HFP01 Hukseflux soil heat flux sensors Constants Const HFP01_CAL_1 14 90 Unique multiplier for HFP01 1 1000 sensitivity 1000 67 1 Const HFP01_CAL_2 14 92 Un...

Страница 17: ...will enhance the output signal In FIGURE C 1 the joints of a copper constantan thermopile are alternatively placed on the hot and the cold side of the sensor The thermopile is embedded in a filling ma...

Страница 18: ...nd its environment for example 0 6 for a typical sensor and 0 03 for an insulating wall is about 40 FIGURE C 2 Deflection error The heat flux is deflected at the edges of the sensor As a result the he...

Страница 19: ...cennes France Phone 0033 0 1 56 45 15 20 Email info campbellsci fr Website www campbellsci fr Germany Location Bremen Germany Phone 49 0 421 460974 0 Email info campbellsci de Website www campbellsci...

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