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Campbell CS616 User Manual

Other manuals for CS616: Instruction Manual, Features
Manual is about: REFLECTOMETERS

Summary of CS616

  • Page 1

    Cs616 & cs625 water content reflectometers issued: 11.8.15 copyright © 2002-2015 campbell scientific, inc. Printed under licence by campbell scientific ltd. Csl 467 user manual.

  • Page 3: Guarantee

    Guarantee this equipment is guaranteed against defects in materials and workmanship. This guarantee applies for 24 months from date of delivery. We will repair or replace products which prove to be defective during the guarantee period provided they are returned to us prepaid. The guarantee will not...

  • Page 5: Please Read First

    Please read first about this manual please note that this manual was originally produced by campbell scientific inc. Primarily for the north american market. Some spellings, weights and measures may reflect this origin. Some useful conversion factors: area: 1 in 2 (square inch) = 645 mm 2 length: 1 ...

  • Page 7: Contents

    I 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 8

    Ii 10. References ............................................................... 23 appendices a. Discussion of soil water content ......................... A-1 b. Importing short cut code ..................................... B-1 c. Example programs ...................................................

  • Page 9: Reflectometers

    1 cs616 and cs625 water content reflectometers 1. Introduction the cs616 water content reflectometer is an improved version of the cs615 water content reflectometer. The cs625 is a modified cs616 for use with the cr200(x)-series dataloggers. The difference between the cs616 and the cs625 is the outp...

  • Page 10: 4.  Quickstart

    Cs616 and cs625 water content reflectometers 2 4. Quickstart short cut is an easy way to program your datalogger to measure the cs616 or cs625 probe and assign datalogger wiring terminals. The following procedure shows using short cut to program the cs616. The procedure for the cs625 is similar. 1. ...

  • Page 12: 5.  Overview

    Cs616 and cs625 water content reflectometers 4 6. After selecting the sensor, click at the left of the screen on wiring diagram to see how the sensor is to be wired to the datalogger. The wiring diagram can be printed out now or after more sensors are added. 7. Select any other sensors you have, the...

  • Page 13: 6.  Specifications

    User manual 5 completely immersed in typical tap water. A calibration equation converts period to volumetric water content. The cs616/cs625’s cable can terminate in: pigtails that connect directly to a campbell scientific datalogger (option –pt). Connector that attaches to a prewired enclosure (opti...

  • Page 14

    Cs616 and cs625 water content reflectometers 6 6.3 electrical specifications output cs616: 0.7 volt square wave with frequency dependent on water content cs625: 0 to 3.3 volt square wave with frequency dependent on water content power: 65 ma @ 12 vdc when enabled, 45 a quiescent power supply require...

  • Page 15: 7.  Installation

    User manual 7 7. Installation 7.1 orientation the probe rods can be inserted vertically into the soil surface or buried at any orientation to the surface. A probe inserted vertically into a soil surface will give an indication of the water content in the upper 30 cm of soil. The probe can be install...

  • Page 16

    Cs616 and cs625 water content reflectometers 8 figure 7-1. Water content reflectometer wires 7.4 datalogger programming short cut is the best source for up-to-date datalogger programming code. Programming code is needed, when creating a program for a new datalogger installation when adding sensors t...

  • Page 17

    User manual 9 the cs616() crbasic instruction has the following form. Cs616(dest, reps, sechan, port, measperport, mult, offset) dest: the dest parameter is the variable or variable array in which to store the results of the measurement. Dest must be dimensioned to at least the number of reps. Reps:...

  • Page 18: 8.  Operation

    Cs616 and cs625 water content reflectometers 10 measured for the average calculation. An over range value will be stored if the timeout period is exceeded. A value of 1 is recommended if 10 is used for cycle’s parameter. Port: the port parameter is the control port or analogue channel that will be u...

  • Page 19

    User manual 11 16 18 20 22 24 26 28 30 32 0 0.1 0.2 0.3 0.4 cali bration data linear fi t quadrati c fit output period (microseconds) vo lu m et ri c w at er c on te nt (f ra ct io na l) figure 8-1. Cs616 and cs625 linear and quadratic calibrations derived from loam soil figure 8-2 compares the cs61...

  • Page 20

    Cs616 and cs625 water content reflectometers 12 figure 8-2. Cs616 response for different soil types the compacted soil response shows the effect of compaction and high clay content. The signal attenuation caused by compaction or high clay content causes an offset in the response as shown by the near...

  • Page 21

    User manual 13 table 8-1. Standard calibration coefficients for linear and quadratic forms linear quadratic c0 c1 c0 c1 c2 –0.4677 0.0283 –0.0663 –0.0063 0.0007 the linear equation is vwc = -0.4677 + 0.0283 x period . The quadratic equation is vwc = –0.0663 – 0.0063 x period + 0.0007 x period 2 peri...

  • Page 22

    Cs616 and cs625 water content reflectometers 14 table 8-2. Calibration coefficients for sandy clay loam with bulk density 1.6 g cm –3 and electrical conductivity at saturation 0.4 ds m –1 for both linear and quadratic forms. Linear quadratic c0 c1 c0 c1 c2 –0.6200 0.0329 0.0950 –0.0211 0.0010 table ...

  • Page 23

    User manual 15 constant for a soil. Bulk electrical conductivity increases with water content so comparison of the electrical conductivity of different soils must be at same water content. Discussion of the effects of soil electrical conductivity on cs616/cs625 performance will be on a soil solution...

  • Page 24

    Cs616 and cs625 water content reflectometers 16 8.1.4.3 signal attenuation error section 8.1 , water content reflectometer method for measuring volumetric water content (p. 10) , presents a detailed description of cs616/cs625 operation. In summary, the cs616/cs625 is primarily sensitive to the diele...

  • Page 25

    User manual 17 10 15 20 25 30 35 40 4 2 0 2 4 6 8 water content = 30% water content = 12% water content error w ith temperature soil temperature (c) w at er c on te nt e rr or (% vw c) figure 8-4. Percent volumetric water content error adjusted with temperature correction equation 8.2 water content ...

  • Page 26

    Cs616 and cs625 water content reflectometers 18 volumetric water content measurement can be optimized by characterizing the probe response in the specific medium to be measured. The result is a specific calibration equation for a particular medium. The precision and the resolution of the water conte...

  • Page 27

    User manual 19 the linear form is v c c 0 1 * with v , the volumetric water content (m 3 m -3 ); , the cs616 period (microseconds); c o , the intercept; and c 1 , the slope. Required equipment: 1. Cs616/cs625 connected to datalogger programmed to measure output period 2. Cylindrical sampling devices...

  • Page 28

    Cs616 and cs625 water content reflectometers 20 surrounded by soil. Movement of rods from side-to-side during insertion can form air voids around rod surface and lead to measurement error. Collect the probe output period. Repeat previous step and this step 3 or 4 times. Determine volumetric water co...

  • Page 29

    User manual 21 for the bulk density bulk dry cylinder m volume the dry weigh of the sample is divided by the sample tube volume. The volumetric water content is the product of the gravimetric water content and the bulk density bulk g v the average water content for the replicates and the recorded cs...

  • Page 30

    Cs616 and cs625 water content reflectometers 22 collecting measurements of cs616/cs625 period and core samples from the location where the probe is to be used will provide the best soil-specific calibration. However, intentionally changing water content in soil profiles can be difficult. A vertical ...

  • Page 31: 9.  Maintenance

    User manual 23 bulk g v the average water content for the replicates and the recorded cs616 period are one datum pair to be used for the calibration curve fit. 8.2.5 calculations the empty cylinders used for core sampling should be clean; both empty weight and volume are measured and recorded. For a...

  • Page 32

    Cs616 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., 53:433-439..

  • Page 33: Content

    A-1 appendix a. Discussion of soil water content the water content reflectometer measures volumetric water content. Soil water content is expressed on a gravimetric and a volumetric basis. To obtain the independently determined volumetric water content, gravimetric water content must first be measur...

  • Page 35: Code

    B-1 appendix b. Importing short cut code this tutorial shows: how to import a short cut program into a program editor for additional refinement how to import a wiring diagram from short cut into the comments of a custom program short cut creates files that can be imported into either crbasic editor....

  • Page 37: C.1  Cs616 Programs

    C-1 appendix c. Example programs c.1 cs616 programs c.1.1 cr1000 program for measuring eight cs616 probes the following cr1000 program uses the cs616() instruction to measure eight cs616 probes connected to the cr1000 datalogger (table c-1 ). Although this example is for the cr1000, other crbasic da...

  • Page 38

    Appendix c. Example programs c-2 'declare public and dim variables public batt_volt public panel_temp public period (8) public vwc (8) public flag (1) dim i 'declare constants 'cs616 default calibration constants const a0= -0.0663 const a1= -0.0063 const a2= 0.0007 'flag logic constants const high =...

  • Page 39

    Appendix c. Example programs c-3 c.1.2 cr1000/multiplexer program for measuring 48 cs616 probes the following cr1000 program uses the am16/32-series multiplexer to measure 48 cs616 probes connected in the 4x16 configuration; wiring is provided in table c-2 ). The program also measures datalogger bat...

  • Page 40

    Appendix c. Example programs c-4 'declare public and dim variables public batt_volt public panel_temp public period (48) public vwc (48) public flag (1) dim i 'declare constants 'cs616 default calibration constants const a0= -0.0663 const a1= -0.0063 const a2= 0.0007 'flag logic constants const high...

  • Page 41: C.2  Cs625 Programs

    Appendix c. Example programs c-5 c.2 cs625 programs c.2.1 cr200(x) program for measuring four cs625 probes this cr200x program measures volumetric water content with four cs625 probes; table c-3 provides wiring. The average hourly readings are saved in final storage every 4 hours. Table c-3. Wiring ...

  • Page 42

    Appendix c. Example programs c-6 c.2.2 cr200(x) program with temperature correction this cr200x program measures temperature with 109 probe and uses the 109 temperature to correct the period for one cs625. The standard calibration equation is used to convert temperature-corrected period to volumetri...

  • Page 43

    Appendix c. Example programs c-7 'cr200(x) program to read one 109 temperature probe and 1 cs625. 'use temperature to correct cs625 period. 'standard calibration is used to convert cs625 output 'period to volumetric water content. 'sensors are read hourly and average water content and 'temperature a...

  • Page 44

    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 sales@csafrica.Co.Za campbell scientif...