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Appendix C. CR3000/CR5000 Program that Controls the Heater

BeginProg
Scan

(1,Sec,0,0)

'Control the net radiometer heater.

PWM

(duty_cycle,4,250,mSec)

'Datalogger

panel

temperature.

PanelTemp

(panel_temp,250)

'Measure

battery

voltage.

Battery

(batt_volt)

'Measure the HMP45C temperature and relative humidity.

VoltDiff

(t_hmp,1,mV1000C,5,TRUE,200,250,0.1,-40)

VoltDiff

(rh_hmp,1,mV1000C,6,TRUE,200,250,0.1,0)

'Measure NR 01 Net Radiometer.

Resistance

(t_nr01,1,mV200,10,Ix1,1,1675,TRUE,TRUE,200,250,1,0)

VoltDiff

(Rs_downwell,1,mV20C,11,TRUE,200,250,NR01_SHORT_DW_CAL,0)

VoltDiff

(Rs_upwell,1,mV20C,12,TRUE,200,250,NR01_SHORT_UW_CAL,0)

VoltDiff

(Rl_down_meas,1,mV20C,13,TRUE,200,250,NR01_LONG_DW_CAL,0)

VoltDiff

(Rl_up_meas,1,mV20C,14,TRUE,200,250,NR01_LONG_UW_CAL,0)

'Find the HMP45C vapor pressure and saturation vapor pressure (kPa).

VaporPressure

(e_hmp,t_hmp,rh_hmp)

SatVP

(e_sat_hmp,t_hmp)

'Compute net radiation, albedo, downwelling and upwelling longwave radiation.

t_nr01

t_nr01/100

PRT

(t_nr01,1,t_nr01,1,273.15)

Rs_downwell-RsRl_down_meas-Rl_up_meas

albedo

Rs_upwell/Rs_downwell

Rl_downwell

Rl_do(5.67e-8*t_nr01*t_nr01*t_nr01*t_nr01)

Rl_upwell

Rl_(5.67e-8*t_nr01*t_nr01*t_nr01*t_nr01)

CallTable

(scratch)

(

scratch.Output(1,1)

)

Then

GetRecord

(scratch_out(1),scratch,1)

rh_hmp_mean

100*e_hmp_mean/e_sat_hmp_mean

DewPoint

(t_dew_hmp_mean,t_hmp_mean,rh_hmp_mean)

'Control the NR 01 heater using 4 Hz pulse width modulation. Below the dew

' point temperature applies 100% power. Above the dew point, power is reduced

' linearly to 20% until the dew point plus DELTA_SET_POINT_1. After the dew

' point plus DELTA_SET_POINT_1 and until the dew point plus

DELTA_SET_POINT_2

plus

DELTA_SET_POINT_2, the power is reduced linearly to 0%.

If ( (t_nr01 <> NaN) AND (t_dew_hmp_mean <> NaN) AND (no_heat_flag <> TRUE) ) Then

set_point_temperature

t_dew_h273.15

Select Case t_nr01

Case

(

set_point_temperature

)

duty_cycle

Case Is < ( set_point_tempDELTA_SET_POINT_1 )

duty_cycle

MAX_DUTY_(t_nr01-(t_dew_h273.15))*SLOPE_1

Case

(

set_point_tempDELTA_SET_DELTA_SET_POINT_2

)

duty_cycle

MAX_DUTY_(t_nr01-

(t_dew_h273.15+DELTA_SET_POINT_1))*SLOPE_2

C-4

Содержание CNR1

Страница 1: ...CNR1 Net Radiometer Revision 5 11 C o p y r i g h t 2 0 0 0 2 0 1 1 C a m p b e l l S c i e n t i f i c I n c ...

Страница 2: ... IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE Campbell is not liable for any special indirect incidental and or consequential damages 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 cust...

Страница 3: ... Measuring the CNR1 s Temperature with the Pt 100 6 4 4 Calculation of the Albedo for Solar Radiation 7 4 5 Calculation of the Net Solar Radiation Net Short Wave 7 4 6 Calculation of the Net Infrared Radiation Net Long Wave 7 4 7 Calculation of the Net total Radiation 8 5 Wiring 8 6 Datalogger Programming 11 6 1 Calibration Factor 12 6 2 Example Programs 12 6 2 1 Example 1 CR1000 Using Differentia...

Страница 4: ... 1 CNR1 Mounting Options 4 5 1 CNR1 Schematic 9 5 2 Interfacing the Pt 100 Using the 4WPB100 Module 9 6 1 4WPB100 Module 12 Tables 5 1 Datalogger Connections for Differential Measurement When Using a 4WPB100 10 5 2 Datalogger Connections for Single Ended Measurement When Using a 4WPB100 10 5 3 CR3000 and CR5000 Connections for Differential Measurement 11 A 1 Typical output signals of the CNR1 unde...

Страница 5: ... these two pyranometers albedo the ratio of reflected and incoming radiation can also be determined Far Infrared radiation is measured by two CG3 pyrgeometers one for measuring the Far Infrared radiation from the sky the other from the soil surface An incorporated heater allows the CNR1 to be heated to prevent dew or frost accumulation on the sensors Additional information on the CNR1 sensor can b...

Страница 6: ...The Dimensions of the CNR1 2 2 CM3 Specifications Specifications that are part of the ISO classification Response time 95 18 s Non stability 1 change per year Non linearity Max dev 2 5 0 1000 W m 2 Directional error Max 25 W m 2 at 1000 W m 2 Spectral selectivity Max dev 5 350 1500 nm Temperature dependence of sensitivity 6 10 to 40o C 2 ...

Страница 7: ...nce of sensitivity 6 10 C to 40 C Tilt response Max 3 when facing downwards Field of view 150 degrees Sensitivity 5 35 µV W m 2 Impedance 125 Ohm nominal Operating temperature 40 C to 80 C Temperature range for specified behavior 10 C to 40 C Measurement range 250 to 250 W m 2 Spectral range 5 to 50 µm Expected signal range for atmospheric application 4 to 4 mV Expected accuracy for daily sums 10 ...

Страница 8: ...ipe 2 Insert the CNR1 mounting arm of the sensor into the 14264 mounting block Tighten the four set screws just enough to secure the mounting arm position but loose enough to allow the arm to be rotated Do not attempt to rotate the instrument using the sensor heads or you may damage the sensors use the mounting arm only NOTE 3 Loosen the vertical adjustment screws on the back of the 14264 mounting...

Страница 9: ... an example CR3000 CR5000 program that controls the CNR1 heater 4 Using the CNR1 in the Four Separate Components Mode 4SCM In the 4SCM configuration measuring two Solar Radiation signals two Far Infrared signals and for calculation purposes one Pt 100 signal all signals are measured separately Calculation of Net Radiation and albedo can be done by the datalogger or later by the computer from the r...

Страница 10: ...e following equation For the CG3 only E V C 5 67 10 8 T4 4 2 In this equation C is the sensitivity of the sensor Please bear in mind that T is in Kelvin and not in Celsius or Fahrenheit 4 3 Measuring the CNR1 s Temperature with the Pt 100 The Pt 100 temperature sensor is located in the CNR1 body It will not measure the exact temperature of the CG3 unless the whole instrument is in thermal equilibr...

Страница 11: ...he Net Solar Radiation Net Short Wave Net Solar radiation is equal to the incoming solar radiation minus the reflected solar radiation Net Solar radiation E upper CM3 E lower CM3 4 4 In this formula E is calculated according to Equation 4 1 Net Solar radiation will always be positive Checking this can be used as a tool for quality assurance of your measured data 4 6 Calculation of the Net Infrared...

Страница 12: ...ith T cancel from this equation 5 Wiring Figure 5 1 shows the CNR1 schematic with the four radiation outputs Pt 100 temperature sensor and the heater The use of the heater is described in detail in the Appendix B All wiring schemes shown in this manual will show wiring for both CNR1 and 4WPB100 modules Wiring diagrams and Tables 5 1 and 5 2 are applicable only if you bought the CNR1 Net Radiometer...

Страница 13: ...CNR1 Net Radiometer FIGURE 5 1 CNR1 Schematic EX1 4WPB100 Red CNR1 DATALOGGER Yellow Green PT 100 Blue H L G 10K 5H 5L 6H 6L 100 FIGURE 5 2 Interfacing the Pt 100 Using the 4WPB100 Module 9 ...

Страница 14: ...tial Input L Differential Input L CG3 Down Signal Brown Differential Input H Differential Input H Differential Input H CG3 Down Reference Green Differential Input L Differential Input L Differential Input L Shield Shield G Jumper to AG or with user supplied wire Cables extended 48 have an orange wire Pt 100 Temperature Sensor Connections to 4WPB100 and Datalogger Function Color 4WPB100 Datalogger ...

Страница 15: ...alogger Programming The CNR1 outputs four voltages that typically range from 0 to 15 mV for the CM3 sensors and 5 mV for the CG3 sensors A differential voltage measurement VoltDiff or Instruction 2 is recommended because it has better noise rejection than a single ended measurement If differential channels are not available single ended measurements VoltSe or Instruction 1 can be used The acceptab...

Страница 16: ...2 the multiplier is 1000 7 3 136 99 W m 2 mV 6 2 Example Programs 6 2 1 Example 1 CR1000 Using Differential Channels Program Example 1 requires six differential channels and the 4WPB100 module to measure the four radiation outputs and the Pt 100 temperature sensor The program measures the sensors every 2 seconds and calculates and stores the following data to final storage every 60 minutes Year Ju...

Страница 17: ...Rs W meter Units NetRl W meter Units Albedo W meter Units UpTot W meter Units DnTot W meter Units NetTot W meter Units CG3UpCo W meter Units CG3DnCo W meter Define Data Tables DataTable Table1 True 1 DataInterval 0 60 Min 10 Average 1 CM3Up FP2 False Average 1 CM3Dn FP2 False Average 1 CG3Up FP2 False Average 1 CG3Dn FP2 False Average 1 CNR1TC FP2 False Average 1 CNR1TK FP2 False Average 1 NetRs F...

Страница 18: ...3DnCo CG3Dn 5 67 10 8 CNR1TK 4 Call Data Tables and Store Data CallTable Table1 NextScan EndProg mV20 range for the CR5000 mV50 range both with 4200 mV excitation for CR5000 6 2 2 Example 2 CR5000 Using Differential Channels no 4WPB100 Program Example 2 requires five differential channels and one current excitation channel to measure the four radiation outputs and the Pt 100 temperature sensor The...

Страница 19: ... DOWN upwelling longwave radiation signal reference green 6H CNR1 Pt100 yellow 6L CNR1 Pt100 green Current Excitation IX1 CNR1 Pt100 red IXR CNR1 Pt100 blue Declare Variables and Units Public Batt_Volt Public CM3Up Public CM3Dn Public CG3Up Public CG3Dn Public CNR1TC Public CNR1TK Public NetRs Public NetRl Public Albedo Public UpTot Public DnTot Public NetTot Public CG3UpCo Public CG3DnCo Units Ba...

Страница 20: ...r measurements CM3Up CM3Dn CG3Up CG3Dn CNR1TC CNR1TK NetRs NetRl Albedo UpTot DnTot NetTot CG3UpCo and CG3DnCo CNR1 Sensitivity 7 30 uV m 2 VoltDiff CM3Up 1 mV20C 1 True 200 250 136 99 0 VoltDiff CM3Dn 1 mV20C 2 True 200 250 136 9 0 VoltDiff CG3Up 1 mV20C 3 True 200 250 136 9 0 VoltDiff CG3Dn 1 mV20 4 True 200 250 136 9 0 Resistance CNR1TC 1 mV200 6 Ix1 1 1675 True True 200 250 1 0 0 Formulate the...

Страница 21: ...emperature degrees C Avg CNR1 temperature degrees K Avg Net shortwave radiation Avg Net longwave radiation Avg Albedo Avg Total Net radiation Avg temperature corrected CG3 Up Avg temperature corrected CG3 Down Wiring for Program Example 3 Color Function Example CR23X Program Channels Used Red CM3 Up Signal 1H Blue CM3 Up Reference 1L White CM3 Down Signal 2H Black CM3 Down Reference 2L Grey or Ora...

Страница 22: ...ivity 6 0 Offset Measure CG3 Up and CG3 Down longwave radiation Note Multiplier Parameter 5 will be different for each CNR1 2 Volt Diff P2 1 2 Reps 2 21 10 mV 60 Hz Reject Slow Range 3 3 DIFF Channel 4 3 Loc CG3_up 5 136 99 Mult mult 1000 CNR1 sensitivity 6 0 Offset Measure CNR1 temperature 3 Full Bridge w mv Excit P9 1 1 Reps 2 22 50 mV 60 Hz Reject Slow Ex Range 3 22 50 mV 60 Hz Reject Slow Br R...

Страница 23: ...3 Up CG3 Up CM3 Down CG3 Down 9 Z X Y P33 1 1 X Loc CM3_up 2 3 Y Loc CG3_up 3 23 Z Loc Up_total 10 Z X Y P33 1 2 X Loc CM3_dn 2 4 Y Loc CG3_dn 3 24 Z Loc Dn_total 11 Z X Y P35 1 23 X Loc Up_total 2 24 Y Loc Dn_total 3 10 Z Loc Net_total Correct CG3 Up and CG3 Down for temperature CG3_upCor CG3_up 5 67 10 8 Temp_K4 CG3_dnCor CG3_dn 5 67 10 8 Temp_K4 12 Z F P30 1 5 67 F 2 8 Exponent of 10 3 25 Z Loc...

Страница 24: ...e 25 mV range for CR10X 50 mV for 21X and CR7 4200 mV for 21X and CR7 2100 mV for CR10X 25 mV range for CR10X 50 mV for 21X and CR7 7 5 mV range for CR10X 5 mV for 21X and CR7 6 2 4 Example 4 CR23X Program Using Single Ended Channels Program Example 4 requires four single ended channels to measure the four radiation outputs and two differential channels and the 4WPB100 module to measure the Pt 100...

Страница 25: ...nal 6H Green Pt 100 Signal 6L CR23X CNR1 sensitivity for program example 7 30 uV W m 2 Multiplier for measurement instructions 1000 7 3 136 99 Table 1 Program 01 2 Execution Interval seconds Measure CM3 Up and CM3 Down shortwave radiation Note Multiplier Parameter 6 will be different for each CNR1 1 Volt SE P1 1 2 Reps 2 22 50 mV 60 Hz Reject Slow Range 3 1 SE Channel 4 1 Loc CM3_up 5 136 99 Mult ...

Страница 26: ...eal Time P77 1 0220 Day Hour Minute midnight 2400 8 Average P71 1 6 Reps 2 1 Loc CM3_up Copy range code options from example 1 here Proper entries Proper entries will vary with program and input channel usage 25 mV range for CR10X 50 mV for 21X and CR7 4200 mV for 21X and CR7 2100 mV for CR10X 25 mV range for CR10X 50 mV for 21X and CR7 7 5 mV range for CR10X 5 mV for 21X and CR7 7 Calibration The...

Страница 27: ... let the CM3 rest for at least five minutes to let it regain its thermal equilibrium For testing set a voltmeter to its most sensitive range setting Darken the sensor The signal should read zero Bear in mind that the response takes about one minute Small deviations from zero are possible this is caused by thermal effects like touching the pyranometer with your hand The latter effect can be demonst...

Страница 28: ...positive voltage when the hand s surface temperature is higher than the pyrgeometer temperature The CG3 will generate a negative voltage if the hand is colder The signal is proportional to the temperature difference see the rule of thumb of Section 4 5 The radiation that is emitted by the hand can be calculated by dividing the pyrgeometer output by the calibration factor and subsequently correctin...

Страница 29: ...ed values of the CG3 s and CM3 s are stated in columns 4 to 7 These are indicative figures only they depend strongly on other circumstances the CG3 results of course change with the sensor temperature This is indicated in column 8 During the day the Pt 100 reading may rise due to solar heating up to 10 degrees above ambient temperature During the night the sensor temperature may be lower than the ...

Страница 30: ...ear 20 100 0 0 1300 0 400 20 53 20 n cloud 20 0 0 0 0 20 20 20 n cloud 20 0 0 0 0 20 20 20 n clear 20 100 0 0 0 20 1 20 n clear 20 100 0 0 0 20 53 20 Values may suffer from the so called window heating offset the sun heats the pyrgeometer window causing a measurement error of 25 Watts per square meter maximum Values may suffer from negative Infrared offsets caused by cooling off of the CM3 dome by...

Страница 31: ...itive to this Offset values for CG3 cannot be determined and therefore are not specified B 1 General Information There is one major reason for heating avoiding water deposition on the CG3 window and on the CM3 dome In case of dew deposition on the CG3 window the dew will ultimately obstruct the Far Infrared radiation completely causing a signal close to zero In the case of rain this will probably ...

Страница 32: ... In case of snow or frost one might also consider heating at a higher level than the usual 6 VA Heating at 20 VA will melt snow in most cases 20 VA can be reached at 22 Volts During high power heating measurement accuracy cannot be specified You are advised to reject measured data readings during this high power heating If lower voltage is available one might consider heating at a lower power The ...

Страница 33: ...5 degrees C above the dew point the duty cycle continue to drop linearly but with a different slope until 0 at 33 degrees C above the dew point If necessary the user can change the two duty cycle slope transitions CR3000 or CR5000 Series Datalogger CR3000 Series Datalogger Copyright c 2009 Campbell Scientific Inc All rights reserved 11 March 09 version 0 0 Wiring ANALOG INPUT 5H HMP45C temperature...

Страница 34: ...NR01shortwavedownwellingmultiplier 1000 15 5 Const NR01_SHORT_UW_CAL 1000 13 93 UniqueNR01shortwaveupwellingmultiplier 1000 13 5 Const NR01_LONG_DW_CAL 1000 8 8 UniqueNR01longwavedownwellingmultiplier 1000 10 5 Const NR01_LONG_UW_CAL 1000 9 4 UniqueNR01longwaveupwellingmultiplier 1000 10 3 Const MAX_DUTY_CYCLE_1 1 Const MAX_DUTY_CYCLE_2 0 2 Const DELTA_SET_POINT_1 5 Const DELTA_SET_POINT_2 28 Cons...

Страница 35: ... 1 t_hmp_mean Alias scratch_out 2 e_hmp_mean Alias scratch_out 3 e_sat_hmp_mean Dim rh_hmp_mean Mean HMP45C relative humidity Dim t_dew_hmp_mean Mean dew point temperature Dim e_sat_hmp HMP45C saturation vapor pressure Units t_hmp_mean C Units e_hmp_mean kPa Units e_sat_hmp_mean kPa Units rh_hmp_mean percent Units t_dew_hmp_mean C DataTable stats TRUE 1 DataInterval 0 5 Min 10 Sample 1 t_hmp_mean ...

Страница 36: ..._nr01 1 273 15 Rn Rs_downwell Rs_upwell Rl_down_meas Rl_up_meas albedo Rs_upwell Rs_downwell Rl_downwell Rl_down_meas 5 67e 8 t_nr01 t_nr01 t_nr01 t_nr01 Rl_upwell Rl_up_meas 5 67e 8 t_nr01 t_nr01 t_nr01 t_nr01 CallTable scratch If scratch Output 1 1 Then GetRecord scratch_out 1 scratch 1 rh_hmp_mean 100 e_hmp_mean e_sat_hmp_mean DewPoint t_dew_hmp_mean t_hmp_mean rh_hmp_mean Control the NR 01 hea...

Страница 37: ...Appendix C CR3000 CR5000 Program that Controls the Heater Case Else duty_cycle 0 01 EndSelect Else duty_cycle 0 01 EndIf EndIf CallTable stats NextScan EndProg C 5 ...

Страница 38: ...Appendix C CR3000 CR5000 Program that Controls the Heater C 6 ...

Страница 39: ......

Страница 40: ...entific Canada Corp CSC 11564 149th Street NW Edmonton Alberta T5M 1W7 CANADA www campbellsci ca dataloggers campbellsci ca Campbell Scientific Centro Caribe S A CSCC 300 N Cementerio Edificio Breller Santo Domingo Heredia 40305 COSTA RICA www campbellsci cc info campbellsci cc Campbell Scientific Ltd CSL Campbell Park 80 Hathern Road Shepshed Loughborough LE12 9GX UNITED KINGDOM www campbellsci c...

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