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Campbell HFP01SC Instruction Manual

Other manuals for HFP01SC: Instruction Manual
Manual is about: Self-Calibrating Soil Heat Flux Plate

Summary of 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 , i n c ..

  • Page 3: Warranty

    Warranty “products manufactured by campbell scientific, inc. Are warranted by campbell scientific, inc. (“campbell”) to be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless otherwise specified in the corresponding campbell...

  • Page 4: Assistance

    Assistance products may not be returned without prior authorization. The following contact information is for us and international customers residing in countries served by campbell scientific, inc. Directly. Affiliate companies handle repairs for customers within their territories. Please visit www...

  • Page 5: Hfp01Sc Table of Contents

    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..........................

  • Page 7: Model Hfp01Sc

    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...

  • Page 8: 5.  Specifications

    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 a...

  • Page 9

    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...

  • Page 10: 6.  Installation

    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 thermocoup...

  • Page 11

    Model hfp01sc self-calibrating soil heat flux plate h uk seflu x h e at flux pl at 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...

  • Page 12

    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 g...

  • Page 13

    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 sens...

  • Page 14

    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). Co...

  • Page 15

    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. Vol...

  • 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 3: 1 s...

  • 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. ; 10: if time is (p92) 1: 0 minutes (seconds --) into a 2: 20 interval (same units as above)...

  • 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 ] 2: 4 z loc [ mv_0 ] ;begin heating for calibration. ; 4: do (p86) 1: 48 se...

  • 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. ; 14: z=x (p31) 1: 2 x loc [ shf_mv ] 2: 6 z loc [ mv...

  • Page 20

    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 ...

  • Page 21

    Model hfp01sc self-calibrating soil heat flux plate ;load in the factory calibration. ; 3: if (xf) (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 ; 2: 0 exponent of 10 3: 3 z loc [ cal ] 5: end (p95) ;use data from th...

  • 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. ;call calibration routine. ; 17: do (p86) 1: 8 call subroutine 8 *...

  • 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 diff channel 4: 7 loc [ v_rf ] 5: .001 mult 6: 0 offset 9: ...

  • 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 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 progr...

  • Page 25

    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 1h sensor signal #2 white 1l sensor signal #3 white 2h sensor signal #4 white 2l sensor signal #5 white 3h sensor signal #6 white 3l all signal referenc...

  • 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 3: 1 se channel 4: 7 ...

  • Page 27

    Model hfp01sc self-calibrating soil heat flux plate 7: z=f (p30) 1: 1 f ; 2: 0 exponent of 10 3: 16 z loc [ cal_4 ] 8: z=f (p30) 1: 1 f ; 2: 0 exponent of 10 3: 17 z loc [ cal_5 ] 9: z=f (p30) 1: 1 f ; 2: 0 exponent of 10 3: 18 z loc [ cal_6 ] 10: end (p95) 11: beginning of loop (p87) 1: 0 delay 2: ...

  • 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) 21: average (p71)^21989 1: 6 reps 2: 1 loc [ shf_1 ] 22: do (p86) 1: 29 set interm...

  • 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) 1: 4 minutes (seconds --) into a 2: 180 interval (same units as...

  • 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) 1: 37 -- x loc [ v_rf_1 ] 2: 37 -- y loc [ v_rf_1 ] 3: 13 -- z loc [ cal_1 ] 21: z=x*f (p37) 1: 13 -- x loc ...

  • Page 31

    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 12 shf_mv_6 1 0 1 13 cal_1 5 5 3 14 cal_2 9 0 1 15 cal_3 9 0 1 16 cal_4 9 0 1 17 cal_5 9 0 1 18 cal_6 9 0 1 19 mv_0_1 9 1 1 20 mv_0_2...

  • Page 32

    Model hfp01sc self-calibrating soil heat flux plate ( ) c c c c s b d m w b d v w = + = + ρ θ ρ θ ρ c w (1) θ ρ ρ θ m w b v = (2) where c s is the heat capacity of moist soil, ρ b is bulk density, ρ w is the density of water, c d is the heat capacity of a dry mineral soil, θ m is soil water content ...

  • Page 33: 7.  Maintenance

    Model hfp01sc self-calibrating soil heat flux plate table 6-8. Hukseflux and campbell scientific variable names description hukseflux campbell scientific soil heat flux ϕ shf output of sensor in mv v sen shf_mv 1/sensitivity 1/e sen2 cal output of sensor during calibration at t=0 seconds v (0) mv_0 ...

  • Page 34

    Model hfp01sc self-calibrating soil heat flux plate 28.

  • 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 sc...