Campbell HFP01SC User manual

Model HFP01SC Self-Calibrating
Soil Heat Flux Plate
Revision: 8/12
Copyright © 2002-2012
Campbell Scientific, Inc.

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HFP01SC Table of Contents
PDF viewers: These page numbers refer to the printed version of this document. Use the
PDF reader bookmarks tab for links to specific sections.
1. Introduction..................................................................1
2. Cautionary Statements................................................1
3. Initial Inspection ..........................................................1
4. Overview.......................................................................1
5. Specifications ..............................................................2
6. Installation....................................................................4
6.1 Placement in Soil ......................................................................................4
6.2 Wiring.......................................................................................................6
6.3 Programming ............................................................................................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 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
i

Model HFP01SC
Self-Calibrating Soil Heat Flux Plate
1. Introduction
The HFP01SC Self-Calibrating Heat Flux Sensor measures soil heat flux,
typically for energy-balance or Bowen-ratio flux systems. It is intended for
applications requiring the highest possible degree of measurement accuracy.
At least two sensors are required for each site to provide spatial averaging.
Sites with heterogeneous media may require additional sensors.
Before installing the HFP01SC, please study
•Section 2, Cautionary Statements
•Section 3, Initial Inspection
The installation procedure is provided in Section 6.
2. Cautionary Statements
•Care should be taken when opening the shipping package to not damage
or cut the cable jacket. If damage to the cable is suspected, consult with a
Campbell Scientific 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
documents to ensure the correct product and cable length are received.
•The HFP01SC is shipped with a calibration sheet and an instruction
manual or a 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. The amount of power used to generate the calibration heat flux is
measured by the datalogger. Each plate is individually calibrated, at the
factory, to output flux.
1

Model HFP01SC Self-Calibrating Soil Heat Flux Plate
In order to measure soil heat flux at the surface, several HFP01SCs are used to
measure the soil heat flux at a depth of eight centimeters. 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.
The -L option on the model HFP01SC Soil Heat Flux plate (HFP01SC-L)
indicates that the cable length is user specified. The HFP01SC-L has two
cables; the first cable is the signal output cable and the 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
Features:
•Corrects for errors due to differences in thermal conductivity between
the sensor and surrounding medium, temperature variations, and
slight sensor instabilities
•Compatible with most of our dataloggers
•Uses Van den Bos-Hoeksma self-calibration method to provide high-
degree of measurement accuracy
Compatibility
Dataloggers: CR800 series
CR1000
CR3000
CR5000
CR9000(X)
CR7X
CR10(X)
CR23X
21X
Operating Temperature: -30°to +70°C
Storage Temperature: -30°to +70°C
Plate Thickness: 5 mm (0.2 in)
Plate Diameter: 80 mm (3.15 in)
2

Model HFP01SC Self-Calibrating Soil Heat Flux Plate
Average Power Consumption: 0.02 to 0.04 W
Sensor: Thermopile and film heater
Heater Voltage Input: 9 to 15 Vdc
Heater Voltage Output: 0 to 2 Vdc
Expected Accuracy: ±3% of reading
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. Placement of heat flux plates
3

Model HFP01SC Self-Calibrating Soil Heat Flux Plate
6. Installation
6.1 Placement in Soil
The HFP01SC Soil Heat Flux plates, the TCAV Averaging Soil Temperature
probes, and the CS616 Water Content Reflectometer are installed as shown in
Figure 6-1.
The location of the heat flux plates and thermocouples should be chosen to be
representative of the area under study. If the ground cover is extremely varied,
it may be necessary to have additional sensors to provide a valid spatial
average of soil heat flux.
Use a small shovel to make a vertical slice in the soil. Excavate the soil to one
side of the slice. Keep this soil intact 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
“this side up” is facing the sky.
NOTE
In order for the HFP01SC to make quality soil heat flux
measurements, the plate must be in full contact with the
soil.
CAUTION
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. Replace the excavated soil back into its original position after
all the sensors are installed.
4

Model HFP01SC Self-Calibrating Soil Heat Flux Plate
H
U
K
S
E
F
L
U
X
H
E
A
T
F
L
U
X
P
L
A
T
E
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
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
External Power Control Jumper
Wire
SW12-CTRL to
Control Port
External Power Control
Not Needed
External Power Control
Not Needed
5

Model HFP01SC Self-Calibrating Soil Heat Flux Plate
TABLE 6-2. Datalogger Connections for a Differential Measurement
Description Color CR10(X)
CR3000, CR5000,
CR23X
CR800, CR850,
CR1000
Sensor Signal White Differential Input (H) Differential Input (H) Differential Input (H)
Sensor Signal
Reference
Green Differential Input (L) Differential Input (L) Differential Input (L)
Shield Clear G
Heater Resistor Signal Yellow Differential Input (H) Differential Input (H) Differential Input (H)
Heater Resistor Signal
Reference
Purple Differential Input (L) Differential Input (L) Differential Input (L)
Shield Clear G
Power Red SW12 SW12 SW12
Power Reference Black G G G
External Power
Control
Jumper
Wire
SW12-CTRL to
Control Port
External Power Control
Not Needed
External Power
Control Not Needed
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.
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 “this side up” to the other side.
The switched 12 Vdc port can source enough current to calibrate
four HFP01SC plates. If additional HFP01SC plates are needed
an external relay is required to power the additional plates (see
example 4).
NOTE
For dataloggers without a SW12V output (CR7X, 21X and CR10), a relay
(A21REL-12) is required for the in-situ calibration (see Example 4).
6.3 Programming
The HFP01SC has a nominal calibration of 15 W m-2 mV-1. Each sensor is
accompanied by a calibration certificate. Each sensor also has a unique
calibration label on it. The label is located on the pigtail end of the sensor
leads.
6

Model HFP01SC Self-Calibrating Soil Heat Flux Plate
TABLE 6-3. Wiring for Example 1
Description Color CR5000
Sensor Signal #1 White 11H
Sensor Signal Reference #1 Green 11L
Shield #1 Clear
Sensor Signal #2 White 12H
Sensor Signal Reference #2 Green 12L
Shield #2 Clear
Sensor Signal #3 White 13H
Sensor Signal Reference #3 Green 13L
Shield #3 Clear
Sensor Signal #4 White 14H
Sensor Signal 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 19L
Shield #3 Clear
Power #3 Red SW12
Power Reference #3 Black G
Heater Resistor Signal #4 Yellow 20H
Heater Resistor Signal Reference #4 Purple 20L
Shield #4 Clear
Power #4 Red SW12
7

Model HFP01SC Self-Calibrating Soil Heat Flux Plate
Example 1. Sample CR5000 Program Using a Differential Measurement Instruction
'CR5000 Series Datalogger
Const OUTPUT_INTERVAL = 30 '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).
Const HFP01SC_CAL_3 = 15 'Unique multiplier for HFP01SC #3 (1000/sensitivity).
Const HFP01SC_CAL_4 = 15 'Unique multiplier for HFP01SC #4 (1000/sensitivity).
'*** Variables ***
Public shf(4)
Alias shf(1) = hfp01sc_1
Alias shf(2) = hfp01sc_2
Alias shf(3) = hfp01sc_3
Alias shf(4) = hfp01sc_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_on)
Sample (4,shf_cal(1),IEEE4)
EndTable
Sub hfp01sc_cal
'Begin HFP01SC calibration on a fixed interval.
If ( IfTime (1,CAL_INTERVAL,Min) ) Then
shf_cal_on = TRUE
Move (shf_mV_0(1),4,shf_mV_run(1),4)
sw12_state = TRUE
EndIf
If ( IfTime (4,CAL_INTERVAL,Min) ) Then
Move (shf_mV_180(1),4,shf_mV_run(1),4)
Move (V_Rf_180(1),4,V_Rf_run(1),4)
sw12_state = FALSE
EndIf
If ( IfTime (END_CAL,CAL_INTERVAL,Min) ) Then
Move (shf_mV_end(1),4,shf_mV_run(1),4)
'Compute new HFP01SC calibration factors.
For j = 1 to 4
shf_cal(j) = (V_Rf_180(j)*V_Rf_180(j)*128.7)/ABS (((shf_mV_0(j)+shf_mV_end(j))/2)-shf_mV_180(j))
Next j
shf_cal_on = FALSE
EndIf
EndSub
8

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.
For j = 1 to 4
shf(j) = shf_mV(j)*shf_cal(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 Green AG
Shield Clear G
Heater Resistor Signal Yellow 1L
Heater Resistor Signal Reference Purple AG
Shield Clear G
Power Red SW12
Power Reference Black G
External Power Control jumper wire SW12-CTRL to C8
9

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
3: 1 SE Channel
4: 2 Loc [ shf_mV ]
5: 1 Mult
6: 0 Offset
;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 range.
;
6: If (X<=>F) (P89)
1: 2 X Loc [ shf_mV ]
2: 4 <
3: -99990 F
4: 30 Then Do
7: Z=X (P31)
1: 8 X Loc [ shf_mV_a ]
2: 2 Z Loc [ shf_mV ]
8: End (P95)
10

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.
;
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 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 Subroutine 8
*Table 2 Program
02: 0 Execution Interval (seconds)
*Table 3 Subroutines
;Calibration routine.
;
1: Beginning of Subroutine (P85)
1: 8 Subroutine 8
11

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 ]
2: 4 Z Loc [ mV_0 ]
;Begin heating for calibration.
;
4: Do (P86)
1: 48 Set Port 8 High
;Used to filter data during and after calibration.
;
5: Do (P86)
1: 18 Set Flag 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 Mult
6: 0 Offset
9: Z=X (P31)
1: 2 X Loc [ shf_mV ]
2: 5 Z Loc [ mV_180 ]
;Turn off the soil heat flux plate heater.
;
10: Do (P86)
1: 58 Set Port 8 Low
11: End (P95)
12

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.
;
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 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 Loc [ cal ]
22: End (P95)
23: End (P95)
End Program
13

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 9H
Sensor Signal Reference Green 9L
Shield Clear
Heater Resistor Signal Yellow 10H
Heater Resistor 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 (Diff) (P2)
1: 1 Reps
2: 25 5000 mV, 60 Hz Reject, Fast Range
3: 9 DIFF Channel
4: 8 Loc [ shf_mV_a ]
5: 1 Mult
6: 0 Offset
14