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CS616 & CS625

Water Content

Reflectometers

Issued: 11.8.15

Printed under licence by Campbell Scientific Ltd.

CSL 467

USER

MANUAL

Содержание CS616

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Страница 3: ...er the repair is under guarantee or not Please state the faults as clearly as possible and if the product is out of the guarantee period it should be accompanied by a purchase order Quotations for rep...

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Страница 5: ...l cell phones and aerials may also not be applicable according to your locality Some brackets shields and enclosure options including wiring are not sold as standard items in the European market in so...

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Страница 7: ...ctometer Method for Measuring Volumetric Water Content 10 8 1 1 Response Curves 10 8 1 2 Calibration Equations 12 8 1 3 Operating Range 14 8 1 3 1 Soil Electrical Conductivity 14 8 1 3 2 Soil Organic...

Страница 8: ...nt volumetric water content error adjusted with temperature correction equation 17 Tables 7 1 Datalogger Reflectometer Wiring 7 8 1 Standard calibration coefficients for linear and quadratic forms 13...

Страница 9: ...ntact a Campbell Scientific application engineer for assistance 2 Cautionary Statements Although the CS616 CS625 is rugged it should be handled as precision scientific instrument External RF sources c...

Страница 10: ...ut to program the CS616 The procedure for the CS625 is similar 1 Install Short Cut by clicking on the install file icon Get the install file from either www campbellsci com the ResourceDVD or find it...

Страница 11: ...Next 5 Under the Available Sensors and Devices list select the Sensors Soil Moisture folder Select CS616 Water Content Reflectometer Click to move the selection to the Selected device window It defaul...

Страница 12: ...ble measurements 5 Overview The water content reflectometer consists of two stainless steel rods connected to a printed circuit board A shielded four conductor cable is connected to the circuit board...

Страница 13: ...t any orientation to the surface CS616 compatible with Campbell Scientific CRBasic dataloggers CR6 CR80 CR850 CR1000 CR3000 and CR5000 CS625 compatible with Campbell Scientific CRBasic dataloggers CR2...

Страница 14: ...oils were typically sandy loam and coarser Silt and clay were present in some of the soils used to characterize accuracy Resolution is the minimum change in the dielectric permittivity that can reliab...

Страница 15: ...en installed to maintain the design wave guide geometry The sensitivity of this measurement is greater in the regions closest to the rod surface than at distances away from the surface Probes inserted...

Страница 16: ...r A Short Cut tutorial is available in Section 4 Quickstart p 2 If you wish to import Short Cut code into CRBasic Editor to create or add to a customized program follow the procedure in Appendix B Imp...

Страница 17: ...stant variable array or expression by which to scale the results of the measurement 7 4 2 CS625 CRBasic Programming The output of the CS625 is a square wave with amplitude of 0 to 3 3 Vdc and a freque...

Страница 18: ...propagation velocity decreases because polarization of water molecules takes time The travel time of the applied signal along two times the rod length is essentially measured The applied signal trave...

Страница 19: ...loam soil Figure 8 2 compares the CS616 response in the Figure 8 1 loam soil to a higher density sandy clay loam for two different electrical conductivities The bulk density for both sandy clay loam...

Страница 20: ...the response curve high EC compacted soil Higher electrical conductivity causes a decrease in the slope of the response curve This is the effect of attenuation by the solution phase 8 1 2 Calibration...

Страница 21: ...n percent volumetric water content Figure 8 3 shows the difference between the linear and the quadratic calibration forms over the typical range A CS616 CS625 output period of 16 microseconds is about...

Страница 22: ...y at a given water content because it takes a longer time to reach the oscillator trip threshold It is important to distinguish between soil bulk electrical conductivity and soil solution electrical c...

Страница 23: ...thus inhibit polarization by the applied field Organic matter and some clays are highly polar These solid constituents can affect CS616 CS625 response to water content change and require specific cali...

Страница 24: ...ctive mineral constituents The general calibration equation for the CS616 CS625 will provide good results with attenuation equivalent to about 0 5 dS m 1 bulk electrical conductivity Between 0 5 dS m...

Страница 25: ...the parallel rod design in soil is inherently a lossy medium and attenuation is frequency dependent both the amplitude of the reflection and the rise time or bandwidth are affected Instead of a relat...

Страница 26: ...near form 1 0 C C v with v the volumetric water content m3 m 3 the water content reflectometer period microseconds Co the intercept and C1 the slope Two data points from careful measurements can be en...

Страница 27: ...nearly dry The soil will be homogeneous around the probe rods if it is poured around the rods while dry Also a 10 cm diameter PVC pipe with length about 35 cm can be closed at one end and used as the...

Страница 28: ...dure again if needed With soil at equilibrium record the CS616 CS625 period value Take subsamples of the soil using containers of known volume This is necessary for measurement of bulk density Copper...

Страница 29: ...eriod microseconds and an independently determined volumetric water content From this data the probe response to changing water content can be described by a quadratic calibration equation of the form...

Страница 30: ...the soil where the probe rods were inserted This is necessary for measurement of bulk density Copper tubing of diameter 1inch and length about 2 inches works well The tubes can be pressed into the so...

Страница 31: ...hold the core sample during drying in an oven To obtain mwet subtract the cylinder empty weight and the container empty weight from the weight of the soil filled cylinder in the tray Remove all the so...

Страница 32: ...6 and CS625 Water Content Reflectometers 24 Rhoades J D N A Manteghi P J Shouse W J Alves 1989 Soil electrical conductivity and soil salinity New formulations and calibrations Soil Sci Soc Am J 53 433...

Страница 33: ...ater then weighing the dried soil mdry g water soil wet dry dry m m m m m Volumetric water content v is the volume of liquid water per volume of soil Volume is the ratio of mass to density b which giv...

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Страница 35: ...ram 2 Open CRBasic Editor 3 Click File Open Assuming the default paths were used when Short Cut was installed navigate to C CampbellSci SCWin folder The file of interest has a CR6 CR1 CR8 CR3 CR2 or C...

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Страница 37: ...s for the CR1000 other CRBasic dataloggers are programmed similarly Table C 1 Datalogger Connection for Eight CS616s Example Program Probe Number Green Orange Red Black Clear CS616 1 5H C7 12V G CS616...

Страница 38: ...le 8 Period FP2 Sample 8 VWC FP2 EndTable Main Program BeginProg Scan 5 Sec 0 0 scan instructions every 5 sec Battery Batt_volt PanelTemp Panel_temp 250 Set flag 1 High every 30 min Note User can manu...

Страница 39: ...in Table C 2 The program also measures datalogger battery voltage and temperature Table C 2 Wiring for CR1000 Multiplexer Example CR1000 AM16 32 series 4x16 CS616 Control Common Sensor Terminals C4 R...

Страница 40: ...ain Program BeginProg Scan 5 Sec 0 0 scan instructions every 5 sec Battery Batt_volt PanelTemp Panel_temp 250 Set flag 1 High every 30 min Note User can manually set flag 1 high low If IfTime 0 30 min...

Страница 41: ...Battery Clear G CR200 X program to read 4 CS625s Standard calibration is used to convert CS625 output period to volumetric water content Sensors are read hourly and average water content are written t...

Страница 42: ...y and average water content and temperature are written to storage every 4 hours Wiring for the CS625 is provided in Table C 4 and wiring for the 109 is provided in Table C 5 Table C 4 CS625 Wiring fo...

Страница 43: ...ublic vwc Declare Constants Water content calibration constants Const a0 0 0663 Const a1 0 0063 Const a2 0 0007 Temperature correction constants Const t0 0 526 Const t1 0 052 Const t2 0 00136 Referenc...

Страница 44: ...Centro Caribe S A CSCC 300N Cementerio Edificio Breller Santo Domingo Heredia 40305 COSTA RICA www campbellsci cc info campbellsci cc Campbell Scientific Ltd CSL Campbell Park 80 Hathern Road Shepshe...

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